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How to plan a home energy retrofit in Ireland

A good retrofit plan treats the house as one system. Start with an assessment of heat loss, ventilation and heating demand, decide the target and budget, then sequence measures so later work does not undo earlier work.

Published 11 July 2026Last reviewed 11 July 2026Published by Around.ie · Reviewed by Around Editorial DeskReview by 11 January 2027 or when official guidance changes

Start with the building, not a product

A Building Energy Rating estimates performance under standard assumptions and its advisory report identifies possible improvements. A retrofit assessment can go further by examining the fabric, ventilation and heating design for your particular project.

Record comfort problems, damp or condensation, energy use and planned building work. These details help distinguish a heat-loss problem from a control, maintenance or ventilation problem.

Use a sensible sequence

  1. Repair leaks, moisture problems and unsafe systems.
  2. Plan insulation, airtightness and ventilation together.
  3. Reduce heat demand before sizing a replacement heating system.
  4. Choose controls and emitters that suit the system.
  5. Commission the work and obtain warranties, certificates and an updated BER where relevant.

Compare delivery routes and grants

SEAI offers individual grants and a One Stop Shop route. Compare the full scope, price, grant treatment, responsibility for design and what happens if hidden defects appear. Apply and receive any required grant offer before starting work.

Independent evidence helps: ask how recommended measures were sized and how ventilation, thermal bridging and moisture risk will be managed.

Sources and review record

This guide provides general information for the Republic of Ireland. Check the linked official guidance for your circumstances and current rules.