Domestic Energy Assessments (DEA)

Since 2003 the EU directive on the Energy Performance of Buildings came into force creating a common framework to promote the improvement of energy performance of buildings across the EU. One of the requirements of the directive is the introduction of Energy Performance Certificates (EPC). These must be produced whenever a building is constructed, sold, or rented.

The EPC is made available to the owner, prospective purchaser, or tenant and includes information on the current energy perfomance of the building and where improvements can be made. EPC's can only be prepared and issued by accredited Domestic Energy Assessors.

ddp are accredited Domestic Energy Assessors and are able to carry out the above process for any size or type of residential development, offering competitive rates to agents and individuals alike.

SAP Assessments

SAP (Standard Assessment Procedure)With the world's focus on CO2 emissions, building designers and developers need to consider the impact that their designs are having on the environment. This is regulated with legislation like the Building Regulations Part L1A: Conservation of Fuel and Power and the Code for Sustainable Homes. Part L1a of the Building Regulations requires that SAP (Standard Assessment Procedure) calculations are carried out on all new build developments to prove that they are not contributing excessively to carbon emissions.

Part L1A attempts to reduce the Carbon Emissions of the new dwellings by targeting five criteria to achieve compliance. Firstly, the Dwelling Emission Rate should be equal to or less than the Target Emission Rate. This is achieved using the government approved calculation methodology, which in this case is the SAP calculation. The other factors include air permeability rates, restricting U values and limiting solar gains in summer.

PEA (Predicted Energy Assessment)There are 2 stages for the SAP Calculations.

The Design Stage is completed and submitted at the same time as the building control application to the Building Control Body or Approved Inspector. This also produces the PEA (Predicted Energy Assessment) that is now required before the property can be marketed.

The As-Built Stage is calculated when the premises is complete. From the calculation, a Compliance Submission Report is produced for submission to the Building Control Officer or Approved Inspector.  This part of the assessment is used to produce the EPC (Energy Performance Certificate) which is required on all new properties completed since 6th April 2008.  The certificate sets out the dwellings SAP & Energy Efficiency ratings and also has a list of recommended upgrades in order of cost effectiveness and forms part of the HIP (Home Information Pack).

ddp are Authorised SAP Assessors and are able to carry out the above process for any size or type of residential development.

Code for Sustainable Homes Assessments

The Code for Sustainable Homes assessment can be broken down into two stages:

In the Design Stage review, the design specifications are assessed for each individual dwelling, before construction begins. A rating is determined, and (subject to quality assurance) a Design Stage or Interim Certificate is awarded for each dwelling.

SAP (Standard Assessment Procedure)The Post Construction Stage (PCS) assessment confirms that dwellings have either been built to the Design Stage specifications or to (documented) variations from the Design Stage. Variations must be re-assessed so that new scores and Code levels can be calculated for each affected dwelling. Where a Design Stage assessment has been done, it is used to inform the PCS assessment.

The Code has a scoring system of six levels. The different levels are made up by achieving both the appropriate mandatory minimum standards together with a proportion of the 'flexible' standards. Code Level 3 is approximately equal to the Ecohomes VERY GOOD score.

ddp as registered assessors can apply for assessment of a site, compile and submit a design report for assessment and monitor the assessment status online. We are also able to complete both the Design stage review and post construction stage assessment and report the results accordingly.

Renewable Energy Studies / Reports

With the every increasing demand on the world's energy resources, and the increasing costs of energy, a number of people are considering low or zero carbon technologies, or renewable energy. A number of Local Authorities have included into their policies that new developments shall include a portion of their energy requirements from a renewable source. With this in mind, ddp are able to undertake appraisals and to produce renewable energy reports. These can be in the form of an outline report that can be used to supplement an application or more detailed report to discharge a planning condition or satisfy a S106 agreement.

Building Services Design

With his Building Services background, Jason Doherty is also capable of offering a full range of building services design and advice to a wide range of clients. This may involve the preparation of a design specification, informal advice, heat loss calculations, system design, or site involvement and can cover all areas of building services such as mechanical, electrical and public health, with a specialised knowledge of renewable energy resources and technologies.


  • Residential planning
  • Large residential schemes
  • Architectural design


  • Household extensions
  • New residential dwellings
  • Large residential schemes


  • Feasibility sketches and design appraisals
  • Planning Applications
  • Planning Appeals
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