Frequently Asked Questions

There can be a number of reasons why your Energy Performance Certificate rating varies from your Predicted Energy Assessment.
The EPC Rating is split into two A-G charts, where A is extremely efficient, and G is not efficient at all. These figures are based on two main factors: the amount of Carbon Emissions expected to be produced, and how much you will be expected to pay in fuel bills.
The most common reason for a different figure is if you have made alterations to the building fabric or heating systems since we issued the PEA to you. Any change which ultimately affects the amount of fuel needed to heat and power your home will have a knock-on affect on the EPC.
Another key reason is a change in methodology which occured in April 2011. Reports which were issued before this date were based on older fuel prices and emission factors, so your rating would typically be slightly better than it is now.
If you have scored a very good result on your air test, this can usually show an improvement on the EPC, particularly if the design calculation was based on a much higher figure.

If you're planning an extension and are keen to include large areas of glazing, you may be put off by the restrictions in Part L.

Never fear! Energist can help.

By comparing the likely CO₂ emissions of the property with the proposed extension to one with a notional extension, we can produce a report to show the extension complies with Building Regulations.

For more information and advice and an instant quotation over the phone, call us on 08458 386 387.

‘SAP2009' represents the biggest rewrite of Part L since 2005 when the first SAP calculation was introduced. It's objective is to further reduce carbon emissions from new homes, in line with the Government's strict targets.

This is the third major overhaul of SAP assessing this decade and if you need to find out how it affects your developments, call us today. You can be assured that Energist's technical department will be keeping up to speed, and will be able to give you the most up-to-date advice on Part L calculations. Any questions? Call us on 08458 386 387.

Since April 2006, a SAP or Standard Assessment Procedure Calculation has been a requirement on all new build residential dwellings.

To complete a SAP assessment, we need to consider (among other things):
- the size of your house
- heat losses through walls, roofs and windows
- orientation to measure sunlight
- heating and hot water types and efficiency
- lighting
- ventilation
- renewable technologies

The end figure is called a Design Emission Rate (DER) which is the predicted amount of kilograms of Carbon Dioxide created by your house every year, per square metre of floor space. This figure needs to be lower than the Target Emission Rate (TER). As a rule of thumb, the TER is what your house would achieve if built to the very limits of Part L Building Regulations, less 20%.

For advice and a quotation for your next project, call Energist on 08458 386 387.

Part L of the Building Regulations deals with energy use in buildings and specifically the conservation of fuel and power. The regulations are a key part in the Government target to reduce greenhouse gases by 80% by 2050. Energist are experts in all aspects of Part L compliance. If you need advice, call us on 08458 386 387.

At Energist we make it simple and straightforward. All you need to provide us with for your SAP calculation are a site plan with orientation, plans and elevations, and a completed checklist. And if you need someone to talk you through the checklist just give us a call on 08458 386 387. We’re happy to help!

Our prices vary depending on the type and size of project. We also run monthly special offers which offer cost savings on some products. For your bespoke quotation call our Projects and Pricing Team on 08458 386 387.