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 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.

Launch of DEAP4

The launch of the new DEAP4 software has commenced, with access being given to assessors in a phased manner over the coming weeks. This new web-based technology will enable greater scope for future developments benefiting both assessors and homeowners.

There will be a transition period when both DEAP4 and DEAP3 will operate simultaneously. The goal here is to reduce any disruption to the BER assessor community. DEAP3 will remain available to download until the end of the transition period. It will also be possible to publish from DEAP3 to the National Administrative System (NAS) during this time. Support for DEAP3 will end when DEAP4 has been rolled out.

If you are not a registered BER Assessor, but use DEAP3 for purposes other than the production of a BER, please register your details with our helpdesk and we will include you in all future communications relating to the roll out of DEAP4.

DEAP tools and information

​Introduction to DEAP

This document describes the principles of DEAP for those involved in the research, design, construction or retrofit of dwellings. It is also useful for anyone wishing to understand the technical basis for BER certificates and Advisory Reports.

Heat pumps

The tool below is a calculator that accepts inputs from DEAP and the heat pump system designer/installer, and then produces outputs to include in DEAP.

The methodology to assess heat pumps in DEAP was updated based on the Ecodesign (2009/125/EC) and Labelling (2010/30/EU) European directives. The guidance here supersedes Appendix G of DEAP Manual (v3.2.1) - July 2012.

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

Heat pumps Consultation

SEAI are seeking 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. Submissions must be returned via email to the BER Helpdesk ( ) no later than 5pm on Friday 17th of May 2019

DEAP Survey (v2.1) - January 2012

This guidance and survey form is designed to assist BER Assessors record the survey information necessary for input into the DEAP software.

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.

Other information

Technical Support

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

Contact us

Call 1890 252 738