The Dwelling Energy Assessment Procedure (DEAP) is used by BER assessors to calculate the energy performance and carbon dioxide emissions of a home's space heating, water heating, ventilation and lighting.

About DEAP software

DEAP consists of a software tool and guidance manuals. BER Assessors use DEAP to publish Building Energy Rating (BER) certificates and advisory reports for homes. DEAP is also the compliance tool specified in Part L of the Irish Building Regulations.

The DEAP software is web-based and used to calculate the annual delivered energy consumption, primary energy consumption (kWh/m2/year) and carbon dioxide emissions (kgCO2/m2/y) for standardised occupancy.

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Who can use DEAP

You do not need to be a registered BER assessor to use DEAP to carry out BER calculations. Only registered BER assessors can publish BER certificates and advisory reports through DEAP.

Recommended browser

Use Google Chrome or Microsoft Edge as your browser for the best experience.

Access DEAP 4

DEAP methodology documents

This section contains the core DEAP methodology documents.

DEAP Manual

The DEAP Manual describes the assessment methodology for dwellings and must be followed alongside the DEAP Survey Guide. Always use the latest version of the methodology documents.

DEAP Survey Guide

The DEAP Survey Guide describes the DEAP survey methodology for dwellings. This must be followed alongside the DEAP Manual.

DEAP Guidance Document

Check this guidance document if you have questions about the DEAP Manual and Survey Guide. We recommend you do this before contacting the BER Helpdesk.


The DEAP workbook is the BER calculator in Microsoft Excel format. You can use this workbook to view all of the calculation formulas within the DEAP software.

Further tools and guidance

You can find further calculation tools and guidance documents to support the DEAP methodology in our Technical Support section.

Notice of changes

We'll keep you up to date about any upcoming changes to the DEAP methodology documents.

Cooling in dwellings

Guidance and Implementation

The DEAP methodology and software has now been updated to take account of the energy demand for cooling in dwellings.

This update will affect the calculation of a BER when there is a fixed cooling system installed in the dwelling.

All documentation has now been published (May 2022) above and in all relevant locations throughout Technical support for BER assessors sections.

Technical support

You will find a wide range of technical support for BER Assessors in this section. We recommend that you check this section before contacting the BER Helpdesk.

Technical support for BER assessors

BER Helpdesk

Contact us if you have any questions.

Call:  01 808 2029