Retrofit Standard Construction Drawings

Sustainable Building Solutions has launched a set of standard construction drawings designed especially for the retrofit market, focuse on product specification and improving the fabric of an existing building.

There are 20 Standard Construction Drawings available for FREE download. The drawings detail how to retrofit an existing building to maximise the performance of the fabric using standard building materials. The details include five different wall finishes plus solutions for ground floor living, habitable and non-habitable roof spaces.

By using the Retrofit Drawings substantial savings can be made to the annual costs of heating a building. The BRE independently modelled the drawings and calculated that the annual energy costs of a building can be reduced by 65% by following these details in conjunction with a Boiler change and the removal of secondary heating in the front room. In addition the Energy Performance Certificate (EPC) rating could be improved from band E to band B.

The process of modelling the drawings allowed SBS to tackle the key issue of surface condensation which has historically been a barrier to increased energy efficiency, particularly in properties fitted with External or Internal Wall insulation. The BRE tested 88 of the initial details and 36% of them highlighted a risk. Each detail was then carefully reworked with some innovative product positioning to remove the risk. The LABC has now certified the drawings and is recommending them to its members.

Paul Joyner, Director of SBS: “It is incredibly important to get the fabric of a building right, as it is a lot more permanent than renewable energy products that can be removed or updated if needed. Getting it right is also essential if homeowners are going to get the most out of the Green Deal.

“The retrofit details give much more product detail than the new build version, making them even more valuable for those specifying for the Green Deal. By referring to them, a B-rated home can be achieved much more easily. Providing simple and effective solutions are vital if energy efficiency is really going to take off and the Green Deal is going to be a success.”

The introduction of the retrofit collection of drawings follows the success of a new build range which were launched earlier this year. These are aimed at maximising the contribution of the new home fabric under SAP and minimising thermal conductivity

Click here to download a pdf version (note: 8Mb file).

DWG files for use in various CAD packages are available to purchase by emailing