A BER letter alone does not tell you whether your home is ready for a heat pump. For the individual SEAI grant, check the current assessment route and heat loss rather than treating B3 as a universal pass mark. Separately, ask the installer how the proposed system will heat each room.
Which assessment route applies?
The SEAI heat-pump grant page sets out these routes. The home must have been built and occupied before 2021.
| Home and evidence | Route before applying |
|---|---|
| Built before 2007, with a valid BER showing HLI at or below 2.3 W/(K.m²) | Self-declaration |
| Built before 2007, without that evidence | Technical assessment |
| Built from 2007 onward, within the scheme’s age limit | Self-declaration; technical assessment optional |
For the later-home route, SEAI says fabric upgrades are not mandatory. Confirm the appropriate documents before applying, and obtain grant approval before starting works. Different retrofit schemes have their own requirements; use our grant guide for the wider application checks.
Why BER and heat loss are different
A BER describes calculated energy performance under standard assumptions. It includes the building fabric and installed systems; it is not a reading of your actual energy bills. SEAI explains the distinction in Understand a BER.
The Heat Loss Indicator describes heat loss relative to floor area. It is useful evidence for the assessment route, but it is not a heat-pump size or a promised seasonal efficiency. Avoid converting a BER letter directly into a system recommendation.
Ask your BER assessor to explain the evidence behind your rating and whether it reflects completed upgrades. Bring insulation records, window specifications and relevant installation documents to that conversation. Our BER ratings guide explains the wider report.
What to ask the heat-pump designer
SEAI’s installation guidance is a useful starting point. Turn the discussion into a written proposal:
- How was the home’s heating requirement assessed, and what does each room need?
- Which radiators or other heat emitters will remain, and which need changing?
- What operating temperatures and seasonal performance underpin the running-cost estimate?
- What hot-water, electrical, controls and commissioning work is included?
- Which assumptions would change if insulation work happens before installation?
These questions separate the grant paperwork from the design you are buying. A grant route does not establish that every proposed installation will perform equally well.
Do insulation works have to come first?
Ask for a property-specific answer. Where an assessment identifies necessary fabric work, have the proposed measures and their intended effect explained before agreeing the installation sequence. Do not rely on a universal ranked list of upgrades or a promise that one measure will produce a particular BER.
For traditional or older construction, use the older-homes checklist and discuss moisture, ventilation and suitable materials with the relevant professional. Browse our home-energy guides for planning context.
Budget for the assessment separately
The listed technical-assessment grant is €200 (manual, 2026-09-29). Obtain an assessor’s quote and confirm the grant conditions before booking; the grant figure is not the fee.
Source: SEAI, source date 29 September 2026 (manually researched)Keep the assessment, installation quote and grant offer as separate documents. Use our heat-pump running-cost calculator with the designer’s assumptions and your tariff to explore scenarios. Its estimate cannot establish technical suitability or grant approval.
Your next step
Gather your BER documents, construction date and records of completed upgrades. Identify the route in the table, then ask an assessor or registered installer to confirm the documents and design work required. This gives you a concrete basis for comparing proposals before committing to a system.