What is cavity wall insulation?
Most Irish homes built from the 1930s to the early 2000s have a gap — a cavity — between the inner and outer layers of their external walls. Left empty, that cavity lets heat pour out. We fill it with a bonded-bead insulation that’s injected through small, neatly made holes, sealing the gap and dramatically reducing heat loss. As a Kingspan-approved installer, we use trusted, certified systems.
Is your home suitable?
Before any work, we carry out a pre-installation survey to confirm your walls have a suitable cavity and are in good condition. Homes built before the 1930s often have solid walls with no cavity — if that’s the case, we’ll let you know at the survey and talk you through the best options for your home.
Why homeowners choose cavity wall insulation
- Among the best value-for-money insulation upgrades available
- Typically completed in a single day with minimal mess
- Noticeably warmer rooms and a more even temperature
- Lower heating bills and a reduced carbon footprint
- Improves your home’s BER rating
Cavity wall insulation grants
SEAI cavity wall grants increased in 2026 and cover a significant portion of the cost for eligible homes, with enhanced amounts for qualifying welfare recipients. Homes must have been built and occupied before 2011 and the work carried out by an SEAI-registered contractor. We’ll confirm what you qualify for and guide the application. See all SEAI grants.
Simple from first call to finished job
- Free survey — we confirm your walls are suitable and recommend the right system.
- Clear quote — transparent pricing, with grant amounts factored in.
- Installation — most cavity jobs are completed in a single day with minimal mess.
- Aftercare — sign-off and paperwork to support your grant claim.
Indicative SEAI grant for cavity wall insulation
| House type | Standard grant | Enhanced* |
|---|---|---|
| Detached | €1,800 | €2,300 |
| Semi-detached | €1,300 | €1,700 |
| End of terrace | €1,300 | €1,700 |
| Mid-terrace | €850 | €1,100 |
| Apartment | €700 | €900 |
*Enhanced amounts apply to first-time buyers and homeowners on qualifying welfare payments. Indicative SEAI grant amounts, correct as of 2026. Your home must generally have been built and occupied before 31 December 2010, with work by an SEAI-registered contractor. Confirm current grants at seai.ie.
→ SEAI grants explained → Grant & savings calculator → Book a free survey