The Dwelling Energy Assessment Procedure is Ireland's official method for calculating the Building Energy Rating of new and existing dwellings.

DEAP Software

Dwelling Energy Assessment Procedure (DEAP) is a software and manual which calculates energy consumption and carbon dioxide emissions. It considers space heating, ventilation, water heating and lighting in a dwelling. DEAP is free to download but be sure to view the terms and conditions within the links below before downloading.

DEAP is used by registered BER Assessors to calculate the BER of new and existing dwellings and to demonstrate compliance with aspects of the Building Regulations. You can learn how to use DEAP by undertaking a training course and registering as a BER assessor.

Download DEAP

There are two versions of the DEAP software available to BER Assessors. Click on the relevant button below for further information on the software and link to the software.

Visit DEAP 4.2.0    Visit DEAP 3

DEAP Tools and Information

Technical Support

We recommend that you consult the DEAP Technical Bulletins and Guidance Document before contacting us.

Please note that the below technical bulletins and FAQs will be retired on October 31st, 2021. Up until this date, you may continue to use the existing Technical Bulletins or the updated DEAP Guidance Document. Following the 31st of October the DEAP Guidance Document should be used for any subsequent BER assessments.

Heat Pump Systems

The sign off form is be completed by the heating system designer/installer for the dwelling being assessed.​

From the 31st of October the Designer Installer Sign Off Form v5.0 will be retired and superseded by the above v5.3.1

Guidance on the heat loss calculation and radiator sizing/verification for heat pump systems.

DEAP Heat Pump Methodology 2020

A calculator has been developed to allow the following heat pump systems to be included in Domestic BER assessments:

  • Low Temperature heat pumps,
  • Gas adsorption/absorption peat humps,
  • Direct Exchange (DX) heat pumps,
  • Exhaust Air-to-Air heat pumps,
  • Multiple Heat Pump Arrangements

Please note that this calculator and its accompanying guidance only apply to these listed systems.

The calculator must be used when calculating efficiencies for the listed systems for use in residential BER assessments and/or Part L compliance solutions.

The following documents have been developed to support the entry of the systems described above:

Please note: The guidance in Appendix G of the DEAP manual continues to apply.

The majority of heat pump systems can still be entered directly into DEAP 4 without the use of the new calculator. Only the systems listed above require the use of the new calculator.

Heat pumps Consultation

SEAI sought feedback via a public consultation on proposed changes to the methodology and calculations for heat pumps entered in DEAP assessments for BERs and Part L compliance checking in dwellings. The consultation period ended on the 17th of May.

Solar Space Heating - Group Systems

This guidance and calculator helps BER assessors determine the solar contribution from a group solar space heating system that applies to an individual dwelling linked to that system.

Solar Space Heating - Individual Systems

This guidance and calculator helps BER assessors account for the contribution of active solar thermal systems to both domestic hot water and space heating requirements of a dwelling.

Thermal Bridging

This guidance and application helps BER assessors to calculate a non-default Thermal Bridging Factor for use in DEAP.

Technical Guidance Document L- Conservation of Fuel and Energy in Dwellings

Below are six worked examples from Appendix E of the Part L and European Union (Energy Performance of Buildings) Regulations 2019 Technical Guidance Document.

DEAP Water Efficiency Calculator

Water efficiency calculation methodology for assessing the whole-house potable water consumption in the dwelling. 

DEAP Calculator for Elements Adjacent to Unheated Spaces

This calculator is used to enable the calculation of the resultant U value of an element adjacent to unheated spaces in the DEAP software

Energy Show 2019 Presentations

Resources for the Updated Advisory Report

Other information

Contact us

Call  1890 252 738 / 01 248 6986