Offices Nationwide 

Wrexham - SAP Calculations - 01978 633 079

The counties covered by this office are:
Gwynedd County, Flintshire, Conwy County, Wrexham County, Denbighshire, ,

Phone Number: 01978 633 079 Email:

Why Do I Need A SAP Calculation?

Under Part L of Building Regulations in Wrexham, since 2006, any new dwellings or conversions need to have a SAP Calculation and Predicted EPC before any work can begin.

It is the responsibility of the builder to provide any On Construction EPCs when a home is constructed. This will also apply if a building is converted into fewer or more units (material change of use) and changes are made to the heating, hot water provision or air conditioning/ventilation services.

If you are selling a home before it has been built, you will need to provide information about energy efficiency in a Predicted Energy Assessment (PEA).

How Is A SAP Assessment Undertaken?

The crucial information needed for the SAP software relates to the type of dwelling, floors, walls, the roof, windows, doors, lighting, renewable technologies, 'U' values, hot water and ventilation. With this, we can determine if a building complies with Building Regulations in Wrexham.

Amongst other things, the SAP assessor will determine how good the thermal elements are in the floors and walls as well as how well heat passes through these elements - this is known as a 'U' value. A high 'U' value represents a high amount of heat lost - this is used in the SAP calculation which is done off-site but requires plans and drawings of the site in order to be calculated.

What Is A SAP Calculation?

SAP calculations are the Government's Standard Assessment Procedure for Energy Ratings. In order to produce an On Construction EPC (Energy Performance Certificate) or a Predicted Energy Assessment (PEA), a SAP is required, as this is the calculation these certificates are based on.

A SAP rating represents the cost of energy required by a property over the course of a year with a score of 100 meaning there's no energy cost. This is calculated from lighting, heating, hot water systems, renewable technolgies used and the elements of structure. The higher the score, the lower the cost of running it.

Our other services include:
On Construction EPC, Energy Statements, Acoustic Testing, Environmental Noise, Code 4 Sustainable Homes, Sustainability Statements, Part F Ventilation Testing, SAP Conversion Calculations, Part E, Thermography, SAP Extension Calculations, Part G - Water Calculations, Air Leakage Testing,

SAP Calculations can also be known as:
Standard Assessment Procedure, Domestic Carbon Emission Calc, SAP Calc, SAP Rating, TER DER Calculation, Domestic Carbon Emission Calculation, TER DER Calc, SAP Assessment,

E2 Specialist Consultants
July 22 at 5:05pm
One of our office-based consultants is hard at work on the SBEM calculation for a commercial new build in Bristol, Avon. You can get yourself an SBEM quote from our website:

E2 Consultants Delivering compliance solutions for Architects & Developers    Head Office E2 HOUSE, South Park Way, Wakefield 41 Business Park, WF2 0XJ    Questions? Call: 0800 043 8100