NEAP software and methodology
The Non-Domestic Energy Assessment Procedure (NEAP) is Ireland's official methodology for calculating a Building Energy Rating (BER) for non-domestic buildings.
NEAP software
The NEAP software is used to calculate non-domestic building energy ratings.
BER assessors use the NEAP software tool and guidance manuals to publish non-domestic Building Energy Rating (BER) certificates and advisory reports and to demonstrate compliance with Part L of the building regulations. The NEAP software calculates the energy consumption and carbon dioxide emissions of a building. It considers space heating and cooling, water heating, ventilation and lighting information.
You can use the Simplified Building Energy Model (SBEMie) or other approved software to publish non-domestic BERs and demonstrate compliance with Part L.
iSBEMie (default calculation tool)
BRE has developed SBEM for the UK's Ministry of Housing, Communities, and Local Government (MHCLG). MHCLG has enabled the adaptation of SBEM for official use in Ireland within the framework of NEAP.
iSBEMie v5.7a and InpBridge v06.0a1
iSBEMie Version 5.7a and InpBridge Version 06.0a1 must be used to publish assessments from 24th May 2026.
Please note: There is a known issue with the treatment of unheated spaces and the reporting of the ‘total energy use’. The ‘use per floor area’ values are not affected.
All certificates issued under iSBEM v5.7a are valid.
This issue will be resolved in a forthcoming update.
Download iSBEMie v5.7a (opens in a new tab) Download InpBridge v06.0a1 (opens in a new tab)Converting from previous versions of SBEMie
Download our Introduction to SBEM 5.7.a guide for key items to consider when converting from previous versions of the software
Introduction to SBEM 5.7.a (opens in a new tab)iSBEMie v5.7a User Guides
Download the latest SBEMie user guides below.
iSBEMie Usr Guide 5.7.a Basics (opens in a new tab)InpBridge v06.0a1 User Guide
Download the InpBridge user guide below.
InpBridge User Guide (opens in a new tab)Recast EPBD (May 2026): DEAP and NEAP Updates, Part L Compliance and Transitional Arrangements
The updated primary energy, CO2eq factors, and methodology will be implemented in DEAP and NEAP on 24th May 2026. From the implementation date, BERs will be published using the updated assessment procedures only. For the purpose of Part L compliance calculations in the DEAP and NEAP software. The older factors and methodology may still be used to demonstrate compliance, using the DEAP Workbook v1.5, and in NEAP using iSBEMie v5.6a. A copy of this software which has not been updated, should be maintained in a separate folder on the user’s PC for this purpose.
BER assessors may produce a Part L report based on the currently published factors or on the primary energy factors and methodology that applied at the date of application for planning permission, as outlined in DEAP/NEAP Guidance.
iSBEMie v5.6a
iSBEMie Version 5.5h must be used to publish assessments up until the 13th of July 2023. It is not possible to publish BER ratings with iSBEMiev5.6a until the 13th of July 2023.
The only differences between iSBEMie_v5.6a and iSBEMie_v5.5h software versions are the CO2 emission factor and primary energy factor applied for electricity. These have been updated as follows:
For 64-bit Windows only (for running large projects) access iSBEMie x64 (version 5.6a).
Installation
The installation instructions for iSBEMie_v5.6a are no different from those for iSBEMie_v5.5h. View installation instructions for iSBEMie (version 5.5h).
SBEM software MS Runtime error 3048
If you receive a runtime error 3048 message when trying to import a .nct file or start a new assessment, find out how to resolve runtime error 3048 messages.
Converting from previous versions of SBEMie
Download our Introduction to SBEMie for key items to consider when converting from previous versions of the software.
iSBEMie v5.6a User Guide
The look and functionality of the iSBEM_v5.6a interface are no different from those of iSBEMie_v5.5h so the User Guides for iSBEMie_v5.5h can also be used for iSBEMie_v5.6a.
Download iSBEMie User Guide (3 volumes)iSBEMie v5.5h
Up to the 13th of July 2023, all non-domestic BERs can only be published using this version of the iSBEMie software.
Download Software Version: iSBEMieFor 64-bit Windows only (for running large projects) access iSBEMie x64 (version 5.5h).
Installation
View installation instructions for iSBEMie (version 5.5h). To complete installation of iSBEMie (version 5.5h) you should also install software patch 01 and patch 02.
Software Patch 01
Install Patch 01 to make sure multiple renewables of the same type are considered when calculating the RER.
- Download Patch 01 for iSBEMie_v5.5.h: iSBEMie_v5.5.h_patch01.exe
- Download Patch 01 for iSBEMie_v5.5.h_x64 (for use on 64-bit Windows only): iSBEMie_v5.5.h_x64_patch01.exe
Software Patch 02
Install Patch 02 for Part L compliance checks for the SEER cooling (rather than EER). It fixes the instability problems in the overheating assessment for certain platforms.
Note: Install the patch at the same location on your computer where you installed iSBEMie_v5.5.h and Patch01 so that the correct files can be replaced.
- Download Patch 02 for iSBEMie_v5.5.h: iSBEMie_v5.5.h_patch02.exe
- Download Patch 02 for iSBEMie_v5.5.h_x64 (for use on 64-bit Windows only): iSBEMie_v5.5.h_x64_patch02.exe
SBEM software MS Runtime error 3048
If you receive a runtime error 3048 message when trying to import a .nct file or start a new assessment. Find out how to resolve runtime error 3048 messages.
Converting from previous versions of SBEMie
Download our Introduction to SBEMie for key items to consider when converting from previous versions of the software.
Download the iSBEMie v.5.5h User GuideOther software
- G-ISBEM
- DesignBuilder SBEM
- Virtual Environment
Please check with the relevant software provider for SEAI approved versions.
Third-party software validation
SEAI must approve all NEAP software packages. They can be classified as either:
- Dynamic Simulation Modelling (DSM)
- Interface for SBEMie
Contact the BER Helpdesk for information on the validation process for third-party commercial SBEM interface (SBEM-i) software packages and the latest vendor information package.
Call: 01 808 2054
Email: [email protected]
NEAP Methodology Documents
This section contains the core NEAP methodology documents.
NEAP Modelling Guide
This document outlines the Irish approval scheme and validation procedure of non-domestic building energy calculation software.
District Heating Methodology
Calculation of the primary energy, carbon emissions and Part L indicators for buildings connected to district heating systems require factors representative of the specific district heating system.
A calculation methodology for these factors, based on the EPB Standard I.S. EN 15316-4-5 is under development, pending the establishment and implementation of a verification mechanism for district heating data and policy decisions on the accounting for this data.
While the calculation methodology is under development, new default district heating factors have been approved by DECC and DHLGH for selected Schemes, as outlined in the document Default District Heating factors for BER calculations. These are based on conditions, including that the Schemes meet the requirements of Efficient District Heating and Cooling set out in the Energy Efficiency Directive.
Developers or operators of district heating schemes that believe their system would satisfy the definition of "Efficient district heating and cooling" in the Energy Efficiency Directive (EED), should contact SEAI for guidance on submitting their energy data. New defaults for other "Efficient district heating and cooling" schemes may be established subject to verification by SEAI. Guidance from SEAI must be sought before using district heating factors other than as specified in the document Default District Heating factors for BER calculations, or for other schemes than those included in the document.
NEAP BER Publication and Survey Guide
This document contains the NEAP survey and BER publication methodology for non-domestic buildings. The iSBEMie User Guide details the assessment methodology for non-domestic buildings and must be used with this document.
- NEAP BER Publication and Survey Guide (version 3.0) last updated in May 2026
- NEAP BER Publication and Survey Guide, (version 2.1) last updated in June 2023
SBEMie Technical Manual
This document contains a detailed description of the SBEMie calculation engine, including calculation methods and formulae. It's useful if you need detailed information on the SBEM calculations.
- SBEMie Technical Manual (version 5.7a) Last updated May 2026
- SBEMie Technical Manual (version 5.5h) Last updated November 2018
Survey form
This survey form can be used to help you record information during a site survey. It's useful if you want to make sure items aren't left out in error.
NEAP Guidance Document
If you still have questions, we recommend you review the NEAP Guidance Document before contacting us.
NDNAS User Guide
This document describes the procedure to manage and upload BER assessment too the non-domestic BER administration system NDNAS.
NDNAS Error Codes
Further information on the NDNAS error codes can be found in this document.
NEAP databases
These three databases can help you with the selection of building and zonal activity types. They also give useful information on items such as hot water usage and lighting levels, which can help with Part L compliance.
Elements adjacent to unheated spaces
Together, this guidance and calculation tool enables you to calculate an area-weighted adjusted U-value for elements adjacent to unheated spaces for use in SBEM.