This study was written as a consequence of the accrued information available on the sweetening of edifice building. I am convinced that there was a demand for a study that covered the rules which were involved in offsite fabrication which could guarantee that all readers had a good apprehension of the importance of the topic for future developments.
The purpose of the study was to be able to acquire an apprehension of the topic and to to the full understand the emerging progresss which will happen in offsite- fabrication within the UK.
The method is to present the background of offsite fabrication, including and brief analysis of each system, with analysis of the applications of which these methods can be applied to e.g. pupil adjustment and infirmaries. Besides the benefits of the different systems being applied to applications has be analysed, to reason an result of the hereafter advances in offsite fabrication for humanity. Associating the benefits which have been researched to other affairs such as house monetary values being predicted to lift from 2012-2014, where house builders, developers etc are acute to develop and building before the predicated day of the month at a smaller cost and clip graduated table, accomplishing higher quality building. It would accomplish a more fiscal benefit than normal from house monetary values rise, when the house monetary value lifting period has been proven. Included is an probe utilizing instance surveies of developments which have used OSM systems, which has helped to back up the research for the emerging progresss.
The ground behind this survey is to reason what we within the UK can anticipate to see for the close hereafter of edifice building and engineering, and emerging progresss in Offsite Manufacturing. As recent house monetary values within the market are being predicted to hold a rise from 2012, with demand, activity and monetary values, the activity during 2012-2014 should be likely to a rise, promoting increased engagement by house builders, developers, loaners and investors.
The construct of OSM
Offsite industry or building refers to constructing constructions being built non at the location of usage but at a different location, which occurs in a specifically designed fabrication warehouse or works. This kind of procedure industries parts or faculties of the edifice which is at foremost constructed in the mill so transported on specially designed dawdlers to the site. Once on site, the edifice is installed on lasting concrete foundations, which are already positioned before bringing of prefabricated parts. These edifices meet all applicable edifice ordinances and are identical from onsite building
The volumetric technique uses units which are three dimensional faculties that are prefabricated in a mill environment, with the taking market being of either a closed faculty design bathroom cods or units suited for pupil adjustment etc of a one sleeping room layout being used continuously. There are besides unfastened sided faculty units which are besides used that allow deeper program edifices to be constructed, but offer less chances for developing upon proficient inside informations. The benefit achieved from utilizing a volumetric attack is being able to do extremely serviced countries within mill conditions. More than 30 trade activities are transferred off-site, taking to fewer people on site, easier commissioning and less rework. ( Langdon & A ; Everest, 2004 issue 42 ) . The cost of the undertaking normally depends on volume and complexness, but besides for specializer applications which can be of a limited production figure the costs can be exceeded. Whereas, if the production where to be of larger volumes of insistent plants, so the cost of the undertaking can be reduced somewhat. Resulting in the more you want of the same thing, the cheaper it can be.
The Panellised technique consists of level panel walls, floors and roofs which are prefabricated off site and assembled on site. There are different stuffs used within the scope of different systems which are used, dwelling of lumber frames and light steel frames which are unfastened without insularity being fitted, besides mill finished units which have insularity, Windowss, doors and services installed are used.
The chief market for panellised systems is residential building, where in England and Wales, lumber frame has a 5 % portion, much lower than in Scotland and other European states. ( Langdon & A ; Everest, 2004 issue 42 ) With the grounds that residential building in England and Wales has a low portion of lumber frame use, and with England covering the bulk of the UK, its demonstrates that the bulk of the UK does n’t utilize adequate panellised systems. Timber panels typically add a capital cost premium of up to 5 % that can be recouped via nest eggs from reduced defects and rework in a well-managed site. ( Langdon & A ; Everest, 2004 issue 42 ) So with this in head the more expensive it may look to fix and raise the panellised system, there salvaging will be noticeable somewhat before and after the completion of the edifice.
There being many advantages of utilizing panellised systems, such as the velocity, weather impact, and flexibleness of size, and with the integrating of latest package ‘s and fabricating machinery within the mill used today, it allows a drape sum of customisation to be achieved, which allows the demands of clients to be more flexible instead than being limited.
The Hybrid techniques use parts from both other systems, utilizing different advantages such as utilizing the faculty technique for the serviced countries which come from a high quality fitment and others from panellised which allow that attack of flexibleness for other countries which are needed. The full intercrossed solution is comparatively rare ( Langdon & A ; Everest, 2004 issue 42 ) and this can be expected as these individual technique along are financially expensive to get down up, and to fall in the both systems into one more complex and larger service, it is able to see that a larger mill working infinite would be required for the prefabrication phases.
Introduction to the Latest Advances of OSM and the application to lodging in the UK
As we have witnessed from analyzing architectural engineering, that there has been late the increased focal point of greener design schemes in edifice, people of today are now going more active with the taking portion of assisting the environment for a greener one. With many issues of sustainability being a chief focal point, people are protecting the natural resources we have staying to better our environments. Following from this is the progresss in the usage of OSM and the usage of implementing sustainable characteristic which are added within the mill, under better feasible conditions with respects to endure and waste.
The rhythm of invention in alternate systems utilizing renewable and reclaimable stuffs and energy are everyplace. ( Kaufmann & A ; Remick, 2009 ) The focal point on utilizing sustainable schemes within the edifice industry, has led to an progress of the stuffs we use, take for illustration the Apple iphone being one of the taking nomadic phones of today. it no longer uses the ethical attack of a bigger phone is a better one, its changed that attack with the germinating humanity, doing a nomadic phone that you can make more with, which is better. It is now portion of a broader cultural conversation about how to make more with less. ( Kaufmann & A ; Remick, 2009 )
Compared with the edifice industry, now the methods of building we choose to take has changed besides, taking away jobs which may happen onsite such as waste, less labour hours and sustainable characteristics, leting many nest eggs within different facets.
There is a high demand at the minute from markets which are successful such as hotels and pupil adjustment which are demanding work at about maximal capacity for the volumetric attack, compared to the growing of the panellised technique which has non had such an addition in demand.
… a 25 % modern methods quota for places funded under the Housing Corporation ‘s Approved Development Programme, demand for panelled systems is likely to increase as it is the simplest option for Housing Associations to implement. ( Langdon & A ; Everest, 2004 issue 42 )
With this is mind the capacity of the panellised technique should increase due to the increased demand made by the Housing Corporation ‘s Approved Development Programme. Sing the flexibleness of the panellised technique, it is used more frequently for the application to lodging for customisation of design, instead than being insistent like the volumetric attack.
Current usage of OSM
With most places in the UK being still constructed utilizing traditional methods of building, there has been an addition in OSM for lodging. The “ Parliamentary Office of Science and Technology ” study that approximately 10 % of new UK places are built utilizing lumber frames, and 5 % utilizing other MMC ; tantamount to about 25,000 MMC places per twelvemonth ( Parliamental Office of Science and Technology, December 2003 ) . There is more timber frame used within Scotland compared to the remainder of the UK as this technique is easier to come across in that state as its preferred more.
Techniques emerging for OSM and there relation to lodging
With environmental issues still refering the people of today, and developers get downing to acknowledge that it would be good to utilize sustainable methods of prefabricated architecture, benefits such as shorter clip graduated tables, better predictable costs, lower hazard issues, and authorities inducements, leads to sustainable pattern and merchandises to increase and to be used for our environments.
Current lodging seen from history shows the effects of which they have on the environment and of the land they use. Sustainable design is the attack needed to make healthier environments which needs to be implementing within prefabrication for farther nest eggs. With there being emerging techniques for OSM germinating with clip, there can be unsmooth anticipations of what engineering are at manus for usage in the close hereafter.
At the minute there are many techniques being introduced but merely such are really being used, these systems and techniques are listed and discussed below:
SIPS ( structural insulated panel systems )
A recent techniques used involves structural insulated panel systems ( SIPS ) , where insularity nucleus is bonded to sheet board to organize a panel, making a composite edifice stuff. They consist of a sandwich of two beds of structural get oning with an insulating bed of foam board in between. SIPS involve similar structural belongingss as the I beam.
An eco hub is a new technique of multi lodging, where they are used to power a community instead than being on a individual house, which would bring forth a better environment. Alternatively of repairing a figure of solar panels or air current turbines, which would depend on the orientation of the house, they may non be fitted to the best consequence possible. if the house was built at a better thought orientation with the other houses of the new physique community, the environmental engineerings could be allocated within a shared community infinite.
Steel places are besides alleged to be good for allergy sick persons, using none of the rosins, adhesives and chemicals used in other building techniques. ( kit places: eco friendly, 2008 ) . Not necessary a new technique, but it utilizes the old success of utilizing steel to make stronger constructions such as high rise edifices. Steel is different to wood and other stuffs, as it can last for a considerable sum of clip longer. Steel frame kit places will remain in the exact same form as the twenty-four hours it was built ( Benefits of utilizing steel frame kit places, 2009 ) compared to timber framed construction which over clip, turn, crook and move from enduring and land motion. There is besides the involvement in utilizing steel framed systems as it has a certain sum of fire opposition more than other stuffs and it prevents the infestation of beetling infection, which consequences in the long tally salvaging which can be achieved.
Low C accomplishments
As makers are now get downing to utilize OSM, and the enforcement of the Code for Sustainable Homes has been introduced, the makers are uniting the two issues of prefabrication with sustainable characteristic. Let entirely that manufacturing offsite achieves sustainable facets for lower waste produced, lower perturbation and transit, it ‘s a concern to implement further sustainable characteristics of recycled stuffs and sustainable engineerings such as solar panels and photovoltaic panels.
Comparison of Prefab and On-site for lodging
A comparing of prefabrication and onsite building has been introduced as it can assist to reason the advantages and disadvantages for lodging developments and developers.
Procedure programs which have been prepared by the Salford Centre for Research and invention ( Table 1 ) shows the difference in alteration for different building techniques, with comparing to the clip for activities, when workers are needed to get on site, and other resources such as clip acquired for the usage of staging.
Table 1: Comparison of different building methods that have different demands
Brick and Block
Open panel/Advanced panel/ intercrossed
Brick layers on-site Arrival of first following trades Scaffolding in usage 44 yearss 16 hebdomads after groundbreak 11 hebdomads 20 yearss 7 hebdomads after groundbreak 8 hebdomads 20 yearss Not used 6 hebdomads
Beginning: Procedure programs prepared for the National Audit Office by the Salford Centre for Research and Innovation
The tabular array above from the procedure programs are of a illustration developments of 22 homes, where bricklayers would be required to build a brick and block structured home.
It clearly shows that the bricklayers clip on-site is more than half less when utilizing the prefabricated attack compared to a traditional building, and leting the reaching of the first following trades to get down more than half lupus erythematosus of clip with Panellised systems, but differing with volumetric systems as the there is no demand for following trade to be used after hard-on as the units are fitted out within the workshop with all or at least most coatings already applied. The tabular array besides demonstrates than the clip of the needed usage of staging is cut down about by 3 hebdomad with panellised systems and 5 hebdomads for volumetric which consequences in lower costs for the hire of scaffolding equipment unless the makers of the prefabrication have their ain supply of scaffolding if they provided the service of raising the construction with the cost of purchase.
The tabular array above shows costs which have been calculated for a scope of providers of each different technique within the industry. The cost norm has been converted to a scope of upper terminal and lower terminal quality and costs merely cover the building type of a home. It clearly shows that for the traditional building method of onsite plants utilizing brick and block techniques and unfastened panel technique, they hold the lowest building cost of ?600-1000 per M2. As for the loanblend system, its building cost is from $ 700-1100 per M2. Following so at the highest terminal of the cost graduated table is the volumetric technique which ranges from ?780-1300 per M2. These consequences show that the traditional brick and block, and unfastened panel systems are the most cost effectual. As can be seen there is a just sum of convergence of costs for the different methods, and the volumetric technique is the most expensive with respects to building costs, but the consideration towards the clip nest eggs and labour salvaging etc must be taken into history as this will ensue in money nest eggs. If in the nearby hereafter there is possible for decrease in the monetary value of manufactured stuffs and constituents, this could cut down of convergence of different costs. Taking into consideration than faster building and reduced onsite work can accomplish some fiscal benefits to the undertaking
Beginning: Cost computations prepared by the National Audit office utilizing information provided by the Building Cost Information Service and procedure programs developed by the Salford Centre for Research and Innovation
The tabular array above shows where nest eggs are found in relation to floor country, showing that fiscal benefits can be achieved compared to a brick and block building, from utilizing intercrossed and volumetric systems, demoing significant nest eggs with relation to the old tabular array ( Table 2 ) .
The National Audit Office study four advantages that provide fiscal benefits to Landlords if they were to utilize an OSM attack, such as earlier rent can be obtained from the day of the month of release, Social Housing Grants can be drawn at a earlier phase, cut downing involvement payments on capital to fund developments, snagging costs are reduced because off-site building elements are capable to the tighter quality control made possible in mill conditions and the demand for on-site review decreases as the sum of off-site work additions. ( National Audit Office, November 2005 ) . With these four advantages of fiscal benefits from faster building and cut down onsite work, it allows developers to go a portion of a new age for OSM.
Beginning: Cost computations prepared by the National Audit office by the Building Cost Information Service utilizing procedure programs developed by the Salford Centre for Research and Innovation
The tabular array above shows an addition in the proportion of costs that are incurred offsite, where there has been research undertaken to see where most costs occur and the differences, and it clearly shows a monolithic decrease in the clip spent for on-site stuffs and on-site labor for the volumetric technique compared with the brick and block, with the unfastened panel and intercrossed systems sitting in between to two for a balance of both universes. Resulting with if volumetric attacks lowered there cost of offsite fabrication it would increase the demand and fight.
Advantages & A ; Disadvantages of prefabrication
Self back uping constituents are used, so the demand for formwork and staging are lowered.
The sum of clip for building is reduced and constructions are finished faster, leting an earlier return on the capital invested in the undertaking.
Onsite building work and any possible congestion is minimised.
The quality of the completed built tends to be of a better quality as the status are less effected by enduring.
Less waste is produced as they are manufactured in mill conditions, doing it easier to recycle the waste back into another usage.
Templates can be used to retroflex insistent physiques
It is required that careful handling of constituents like glass and concrete panels is undertaken
Attention to detail demands to be taken into consideration sing the that the construction would be less likely to neglect at articulations
Associating to the old, where leaks can organize at the articulations if attending to item is non taken
Transportation system for the volumetric technique can be somewhat more compared to panellised systems which can be packed more expeditiously for less journeys.
Large subdivisions can sometimes necessitate the hire of big Crane and preciseness plants to put into the allocated place
Main drivers for utilizing OSM in lodging
A consideration towards the chief drivers for utilizing OSM in lodging relating to Modern Methods of Construction has been research, as these facets affect the rate of which developers are utilizing OSM within lodging.
The chief drivers for utilizing OSM in lodging are summarised and discussed below:
With there being a deficit in the lodging market in the yesteryear, its allowed authoritiess and some sectors of a building industry to reconsider traditional patterns. As it is difficult for individual people to low-cost lodging, they by and large lead to flats as they are cheaper, which consequences in the authorities and sectors to be interested in how they are built compared to traditional methods as these are going more popular.
An of import issue about flats is that they affect builders ‘ hard currency flow in a manner that houses do non. With houses, each one can be sold and occupied before others are built. With flats, the whole block will normally necessitate to be completed before it is safe to let residents to travel in. ( IHS BRE Press, 2007 )
This shows that hard currency flow can be a job as possible purchasers do n’t desire to pay the full monetary value up front, ensuing in the demand for quicker methods for raising flats, such as modern methods of building, which has that advantage of being a faster physique. Besides the possible purchasers are by and large non that concerned about how the flats were constructed every bit long as the construction performs to a satisfactory criterion.
Skills being trained within the industry is falling behind compared to skilled workers go forthing the industry. The deficit in secret agents has been at least partially compensated for by inward migration and this is peculiarly true for the semi-skilled and laboring classs ( IHS BRE Press, 2007 ) . Resulting in many trades being transferred offsite for uninterrupted.
The National Consumer Satisfaction Survey reported in 2003 that the satisfaction degree among buyers of new places was about 40 % . ( National Audit Office, November 2005 ) . At the minute lodging is overmastering with traditional building techniques which consequences into necessitating to look into other emerging techniques. Where a house can be built with a hapless quality, it can be of a hapless design or it can neglect to conform to that design or both. As edifice companies sometimes fail to conform to the design due to bad conditions conditions that consequence the entire plan. When developers use the OSM attack, they can anticipate to be able to conform easier as the site conditions are controlled indoors, besides taking into consideration the mill machine which is used ensures high criterion of quality to conform.
The sum of waste that can be produced with onsite building, seen to be wasted money, acts as a driver for utilizing modern methods of building to understate the waste, as it ‘s within a controlled environment, sing money nest eggs. Costss which the developer brushs are likely to take down over a class of clip as they will be more knowing of the system for OSM, and let them to develop better efficient schemes for onsite plants.
Main barriers for utilizing OSM in lodging
The chief barriers for utilizing OSM in lodging are summarised and discussed below:
Lack of experience
land in the house edifice procedure
On site accomplishments
Lightweight building overheating job
Lack of experience
With a alteration in the building methods it ‘s more hard to happen house builders with good expertness in this country or at least a house builder that can pick up the method rather easy. This can merely be overcome by the usage of preparation installations to educate the trade heightening their assurance.
The importance of land
The importance of land has an consequence that shows why the new physique industry for OSM is slow, but it can be likely to alter as developers are required to conform with the Code for Sustainable Homes and consequences in building onsite being somewhat disputing compared to earlier.
Many makers work hard to develop hard-on crews and to do certain that they are good trained and this will necessitate to go on and spread out to run into builders ‘ concerns ( IHS BRE Press, 2007 ) . As makers can anticipate to use their ain in-house builders to build to the specifications of the design from that company, this may ensue in onsite trades being minimized, as the makers will desire to supply a better design and build service, to see in positive credibleness of merchandise and service.
Lightweight building methods such as Timber frame, SIPS and steel frame can hold an consequence as clime alterations and summer conditions gets hotter, the constructions may be probably to overheating. The overheating may be resolved by shadowing and airing, it can besides be resolved if the residents of the house required suites to chill quicker, where a construction of a low thermic mass would be acceptable.
There can be restraints which can happen when bringing of the prefabricated parts takes topographic point as the size of the site may be limited. It can merely be given to be that the sites themselves have entree restrictions. OSM techniques used within a forced site can hold its benefits of quicker hard-on which may be needed within a metropolis Centre to do fewer perturbations.
Recycled and refurbished modular edifice – baby’s room, London docklands
There was a demand for a new designed baby’s room edifice for the University of East London ‘s Docklands campus which was constructed from refurbished edifice faculties. They required a more sustainable attack to building, a edifice of a higher quality building which met the client ‘s budgets and a composure and welcoming environment for kids of a immature age. It has demonstrated that there is a possible for this attack of a more environmentally friendly building procedure. The client may hold used this attack of building as some kind of nest eggs in cost, or to move environmentally towards the community as the baby’s room may be a authorities funded undertaking. The baby’s room shows the usage of untreated cladding which achieves a lower impact on the environment, and the construction to the full complies with edifice ordinances.
The benefits achieved are:
it is a edifice that is robust, significant and pleasant to the oculus
Completion on clip graduated table and on limited fundss
The creative activity of a extremely sustainable option for a new physique and a manner of take downing the edifice ‘s C footmark
The Centre has met demands without any changes needed to the design, and provides an attractive installation, which has been good appreciated by staff, kids and parents.
Modular house – Prefabricated
There was a demand for a construction to be built as a modern detached brick house that is wholly prefabricated offsite, it responds to the rules to innovative technique and being witting to environmental issues. The construction is a standard three sleeping room household house, with the demand to cut down site holds. The modular system uses heavy steel frames and solid concrete floors. The house is moved to its lasting location in four units that are installed on to land plants in a individual twenty-four hours, leting a to the full working brooding to be assembled in less than 24 hours. Site work is confined to the laying of foundations and the connecting of faculties and landscape gardening.
The Benefits achieved are:
Increased predictability in costs and clip
Decrease in clip needed for installing
High thermal values
Wall highs of up to 12m achieved
Modular house Extension – Prefabricated
There was a demand for a new extension to be added to a modern ‘Art Deco ‘ place in Cheshire, which retained the period feel of the belongings.
The chief drivers and restraints of the undertaking where to understate the overall clip taken in the undertaking, with restraints from transporting the merchandises to the site.
A steel building method was used with a rendered exterior coating for the prefabricated extension. It was a curving roof extension, which contained a sleeping room with en-suite installations, besides incorporating a coiling stairway. Large glass doors used to open out onto the timber deck of the bing roof. Due to the size of the needed construction the faculty was divided into two subdivisions after being fabricated within the mill to see easier transit
The Benefits achieved are:
The prefabrication took six hebdomads, with all fixtures and suiting built ready into the units
The clip taken to unload and put in the faculties took one twenty-four hours, which allowed the clients to utilize the extension within later of the same twenty-four hours. Connection and interface points took an excess hebdomad to be applied
Results & A ; Discussion
There are 3 chief techniques which have been investigated such as volumetric, panellised and intercrossed systems, with the benefits following being listed:
Volumetric techniques utilizing repetitiousness allow fiscal nest eggs for the developer, whereas Panellised systems chief market is residential building with a low portion of lumber frame use in England and Wales which means the bulk of the UK does n’t use plenty of this technique. Besides that the Hybrid technique is rarer to be used which uses the volumetric and panellised techniques combined.
The probe found that the current usage of OSM reported in 2003 shows that 10 % of new UK places use timber frames and 5 % usage other modern methods of building bring forthing about 25,000 MMC places per twelvemonth.
EMERGING TECHNIQUES FOR OSM
The consequences found show the latest emerging techniques to be used within the edifice industry, which is listed below:
Structurally insulated panel systems ( SIPS )
Flat battalion house or kit places
Recycled edifice faculties
COMPARISON RESULTS OF PREFAB AND ON-SITE CONSTRUCTION
From the comparing consequences of a prefabricated construction and a tradition construction that uses onsite methods more, it can be seen that the bricklayer ‘s clip needed on site is reduced and reaching of first following trades commences before with prefabrication, besides observing that the clip for Scaffolding use is minimized.
Prefabrication or OSM can be given to be more expensive than traditional build building, but does integrate fiscal benefits compared to onsite traditional methods.
Fiscal benefits that can be achieved compared to onsite are:
Shorter adoption period
Less onsite review
The probe found that benefits can besides be achieved from faster building and decreased onsite building, brings fiscal benefits to developers. Besides modern methods of building tend to be more expensive compared to that of onsite traditional physique.
Summary and Conclusion
The aims of the survey have been researched and concluded to accomplish an apprehension of the emerging progresss.
Objective 1: An probe of OSM
The research has revealed that there are three chief techniques used being volumetric, panellised and intercrossed, which panellised system being of the most cost effectual solution for lodging, but differs with the usage of volumetric as they could be used in a insistent mode for flats for illustration brings fiscal benefits.
Objective 2: an probe of the latest progresss for OSM
This research has revealed that the emerging techniques are fighting to be used today within the edifice industry, with SIPS being the most advanced of the bulk of techniques progressing, as this system is the easiest to be applied to lodging applications of today. With the debut to “ Ecohubs ” , its can be expected to see this proficient attack to be implemented more by developer as multi lodging is at an about changeless building rate, which would profit from utilizing aA centralised country within the multi lodging to tie in these engineerings. Flat battalion lodging on the other manus is driven down as it requires external skilled workers to put in the kit, and as these technique are new to the industry, the accomplishment that understand these techniques are reasonably limited.
Objective 3: an probe of OSM applied to lodging in the UK
The research has revealed that panellised systems are of the most common for the usage of OSM for bing edifices are they are more flexible with the application. The volumetric technique is besides used for bing edifices but largely for specific sized extensions. These extensions of the volumetric attack can be seen to be debatable with the fitment of the unit to an bing wall face of a different construction type, as these techniques may non be easy compatible as they can be different, making jobs for articulations of air permeableness and leaks.
Objective 4: an Investigation into the drivers and barriers of utilizing OSM for lodging.
The research has revealed that there can be possible benefits that can be achieved, but besides that barriers can happen at a similar rate, so depending on the type of OSM method to be used, there costs for fiscal benefit can differ. For modern methods of building to go more popular within the edifice industry, developers and makers need to analyze there schemes to be able to get the better of any possible barrier which may forestall any farther development.
Bibliography & A ; Referencing
Benefits of utilizing steel frame kit places. ( 2009 ) . Retrieved Febuary 16, 2010, from Kit Homes state broad pty ltd: hypertext transfer protocol: //www.kithomes.net.au/benefits.htm
IHS BRE Press. ( 2007 ) .Modern Methods of Construction ( MMC ) in lodging.
Kaufmann, M. , & A ; Remick, C. ( 2009 ) .Prefab Green.Gibbs Smith.
kit places: eco friendly. ( 2008, 10 07 ) . Retrieved January 5, 2010, from channel 4: 4homes: hypertext transfer protocol: //www.channel4.com/4homes/diy-self-build/kit-houses/kit-homes-eco-friendly-08-07-10_p_1.html
Langdon, D. , & A ; Everest. ( 2004 issue 42 ) .Cost Model: Off-site Industry. Retrieved from Building: hypertext transfer protocol: //www.building.co.uk/hybrid.asp? navcode=3531
National Audit Office. ( November 2005 ) .Using modern methods of building to construct places more rapidly and expeditiously.
Parliamental Office of Science and Technology. ( December 2003 ) .Modern Methods of house edifice.
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