Thermal calculations for dwellings

These can be split into 3 categories:

  • Completely new-build homes

  • Homes formed by converting an existing structure

  • Extensions to existing homes

Thermal Solutions assess the proposed building specifications and if needed can provide guidance on savings and where improvements are required. For new dwellings this is principally done by what is known as a SAP calculation.

Newly built homes also need to:

  • Achieve minimum standards of thermal insulation to the roofs, walls, floors etc

  • Show compliance with the limitation of their carbon dioxide emissions.

  • Have minimum amounts of low energy internal lighting

  • Have a limited amount of air permeability through the structure

  • Not be at significant risk of overheating through the windows (known as solar gains).

A SAP energy rating is required for all new dwellings in England and Wales, be they a complete new build or formed by converting an existing building. The SAP energy rating works on a scale of 1 to 100+, the higher the number the cheaper the home is to run. However, there is no actual minimum figure the SAP rating must achieve under Building Regulations (England and Wales). Although, the Domestic Minimum Energy Efficiency Standard (MEES) Regulations, set a minimum energy efficiency level for domestic private rented properties.

In addition to the SAP rating, conversions also need to achieve minimum thermal performances for their roof, walls, floor and openings. This applies to new elements of the structure and can also apply to those elements being retained.

The SAP software can also be used to resolve complex extensions, particularly those with large areas of glazing. Because it encompasses the whole house and the extension, it can take advantage of any upgrades to the existing structure, or heating system, and use that to off-set the energy lost through the extra glazing in the extension.

If you would like to discuss your project or would like a quotation, go to the Contact Us page for details on how to proceed.