Energy Calculations


Under Part L of the Building Regulations, all new dwellings and all buildings converted to dwellings, need thermal calculations known as SAP calculations. Some extensions and renovations will also need SAP especially when there’s lots of glazing. The calculations measure heat loss through the building, available sunlight and air permeability. Heating, hot water, lighting and ventilation are then also considered in order to measure a dwelling’s overall energy efficiency.

Our service

We have an in house fully qualified energy assessor and this enables us to offer: 

  • SAP and EPC calculations for all new housing. 
  • SAP calculations for domestic extensions, conversions and change of use.

Why use us

  • We are fully registered SAP Assessors, independently approved by Elmhurst Energy Ltd. 
  • As a local authority service we are fully independent and dependable. 
  • We offer a high quality service which is competitively priced, please see details below.

Our prices

Energy Performance Certificates   Price (per dwelling + VAT)
EPC                                                                                                                           £25.00 


Domestic new build – design stage SAP Calculations
(If the floor area exceeds 250m², please contact us for a quotation.)
 Price (per dwelling + VAT)
(Up to 4 design SAP calculations e-form) (pro-forma)                       £150.00
(5 to 20 designs SAP calculations e-form) (pro-forma)  £110.00
(20+ design SAP calculations e-form) (pro-forma)  £90.00
(Variation calculations e-form) (pro-forma)  £45.00


Domestic conversions and extensions SAP calculations  Price (per dwelling +VAT)
(Conversion calculations under 200m2 floor area e-form (If floor area exceeds this then please contact for a quote)) (pro-forma)  £190.00
(Extension calculation e-form) (pro-forma)  (if the floor exceeds 250m2, please contact us for a quote)  £220.00

To order calculations

Please complete and submit the relevant e-form or print, complete and send in the relevant pro-forma, along with payment of the respective charge. Cheques should be made payable to "Mid Sussex District Council". Online payments for this service can be made by debit/credit card via our online payments system. Please select "Building Control" from the payment-type list and then “Energy Calculations” from the drop-down menu. Enter the site address, the payment amount and your contact telephone number before making the payment.