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Glazed Extension

Extension SAP Assessments

Part L1B of the Building Regulations sets out specific criteria that you are required to comply with when constructing an extension to an existing dwelling. These include include meeting U-value requirements.....

Part L1B of the Building Regulations sets out specific criteria that you are required to comply with when constructing an extension to an existing dwelling. These include include meeting U-value requirements on all new build elements and designing no more than 25% off the extended floor area in glazing.

However, optional approaches with more design flexibility are available. One such approach is to undertake a SAP Assessment to show that the calculated carbon dioxide (CO₂) emission rate from the dwelling with its proposed extension is no greater than that for the dwelling plus a notional extension which is built to the current standard Building Regulations for extensions. New build and renovated elements will still be required to meet the elemental U-value targets.

To meet the Building Regulation requirements, it may be necessary to make additional improvements to the existing dwelling, such as installing extra layers of mineral wool insulation within the loft space. Again, these additional improvements to the building fabric will need to meet the minimum Building Regulation standards.

Conservatories and porches are exempt where the work is at ground level, the floor area is less than 30m2, the heating system does not extend into the conservatory and the external wall and door separating the dwelling and the conservatory is retained.

If you are planning an extension or conservatory or would like further advice and information please do give us a call on 01962 718870.

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