Existing Dwellings

dwelling existingLegal Requirements (Building Regulations Part L1B)

Building Regulations L1B 2015

The European Directive on the Energy Performance of Buildings (EPBD) states that

...  there must be an energy performance certificate [EPC] made available whenever buildings are constructed, sold or rented out  ...

The EPC shows two things -

  • the dwellings Energy Efficiency Rating (KWh/m2 per year) - relates to the running cost of the building
  • the dwellings Environmental Impact Rating (Tonnes/m2 per year) - relates to the carbon dioxide emissions of the building

Each rating is shown on an A–G rating scale similar to those used for fridges and other electrical appliances. EPC's are valid for 10 years.

AssetRating EPC Bristol

Calculation Methodology (rdSAP)

The energy calculation undertaken to produce an EPC on an existing dwelling is referred to as a the  rdSAP (reduced Standard Assessment Procedure).

In other words to produce an EPC we need to do the rdSAP calculation.

Outline of the rdSAP process

Setup Stage (we set up job on our computer and produce a Fee Proposal & Contract)
  • The Client request us for an EPC and gives us the address of the property along with contact details of the Payer.
  • We then set the new job up on our computer system and produce a Fee Proposal & Contract, which is sent to the Client via email.
  • If the Client accepts the Fee Proposal we will then proceed to the Data Gathering Stage
Data Gathering Stage
  • We make an arrangement to visit the dwelling so that we can take measurments and other data.
  • The visit normally takes less than 1 hour. 
Completion Stage
  • Once this data has been gathered the Energy Assessor can generate an EPC and lodge the EPC on the governments ‘Landmark’ database.
  • This process can usually be done in one day.
  • Once payment has been made you will receive your EPC and a Recommendation Report.


Pricing depends upon the complexity and location of the building. If you would like more information, advice or a quotation, then please call

Richard Owen on 01485 544757 or click here for contact information  >>>    Contact Us