Cavity wall insulation installers in Donegal
48 companies on SEAI's register say they do cavity wall insulation in Donegal. Only work by a registered company gets the SEAI grant.
- 7 are based in Donegal; the other 41 cover it from elsewhere.
- The grant for a semi-detached house is €1,300. SEAI’s middle price last year was €1,585.
- Get SEAI’s grant approval before any work starts. SEAI does not pay for work that began first.
- Get three written quotes for the same job. This list is not a ranking.
Insulation blown into a cavity wall through drilled holes. Photographed in the UK.
See your grants for wall insulation, and what you’d pay
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Based in Donegal
7 of them, from SEAI's register (read 25 September 2026). Not an order of merit. Published figure
- AC InsulationAttic insulationCavity wall insulationInternal wall insulationBased in Donegal.
- BCBAL Ltd T/A McGee InsulationAttic insulationCavity wall insulationExternal wall insulationInternal wall insulationBased in Donegal.
- Bio Insulate LtdAttic insulationCavity wall insulationBased in Donegal.
- Ecotech Contracts IRI LtdAttic insulationCavity wall insulationHeat pumpBased in Donegal.
- Gallen Insulation LtdAttic insulationCavity wall insulationBased in Donegal.
- Premier Solutions NW LtdAttic insulationCavity wall insulationInternal wall insulationWindow and doorBased in Donegal.
- Tirconaill Contracts Ltd T/A Mc Taggart InsulationAttic insulationCavity wall insulationExternal wall insulationHeat pumpInternal wall insulationWindow and doorBased in Donegal.
Also cover Donegal from elsewhere (41)
These told SEAI they cover the province Donegal is in, or listed it among the counties they serve. Ask how far they travel before you go any further. Names only here; each one’s full register row is on its own county’s page. OSS = One Stop Shop.
Ashgrove Engineering Ltd T/A Ashgrove Renewables (OSS) · Bayview Contracts Ltd (OSS) · Bord Gais Energy Ltd (OSS) · Breffni Insulation Ltd (OSS) · Churchfield Home Services (OSS) · Cooper Insulation Ltd. (OSS) · Electric Ireland Superhomes (OSS) · Envirobead Ltd. (OSS) · Greenwatt Ltd (OSS) · House 2 Home Retrofit Ltd (OSS) · Kingdom Installation Ltd (OSS) · Kingspan Insulation Ltd (OSS) · Kore Retrofit Ltd (OSS) · Moston Construction Ltd (OSS) · OHK Energy LTD (OSS) · Retrofit Design Ltd (OSS) · Retrofit Energy Ireland (OSS) · SSE Airtricity Energy Services Ltd (OSS) · AB Teague Enterprises Ltd · All In Insulation · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · C.D.M. Contracts Ltd · Clar ICH Ltd · Derchil Limited t/a CosiHomes · Eco Home Insulation · Ecotec Insulation Ltd · Ecowise Insulation Ltd · Evertherm Ltd T/A Annalee Energy Ltd · Innovate Insulation Ltd · Jacob Insulation Limited · Kelly Insulation Heating & Plumbing · Kingscourt Insulation Ltd · Leitrim Warmer Homes CLG · Meegan Insulations · Metro Insulation Ltd · Midland Warmer Homes Company Limited · National Retrofit & Construction Services Ltd · Premier Insulations · Superior Insulations Ltd · Sustainable Warmth Ltd · Thermowise Insulations Limited
See your grants and what you’d pay
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The detail
How Donegal compares
Cavity wall insulation installers who say they work in each county, from SEAI's register. Published figure
48 cavity wall insulation installers say they work in Donegal; the median county has 87
Donegal is 26th of 26. The most list Kildare (92); the fewest, Donegal (48). 18 One Stop Shops list Donegal.
Each bar counts companies on SEAI's register that list the county for cavity wall insulation. Many firms tick a whole province, so counts move in regional steps. A count is choice, not capacity. Registration is paperwork, not a review of their work.
Sources: SEAI home energy, One Stop Shop and solar registers, read 25 Sep 2026
What it costs, and what the grant pays
National figures, not Donegal ones: SEAI does not publish prices by county. SEAI rule
On a semi-detached house, SEAI's middle price of €1,585 less the grant leaves €285 to pay.
Before you sign
Four things SEAI tells homeowners to do.
- Wait for your grant approval email before any work starts. SEAI does not pay for work that began before it was approved.
- Get at least three quotes, and check each one covers the same job. The cheapest quote is often the one that leaves something out.
- Check the company is on the register on the day you sign. Companies join and leave it, and this page is a copy taken on one day.
- Get it in writing: what is being done, what it costs, when it starts and when it is finished.
Questions people ask
- Do I have to use one of these companies to get the grant?
- Yes. SEAI only pays a grant on work done by a company on its register, and the company claims it on your behalf. Work done by anyone else is not covered, however good it is.
- How many quotes should I get in Donegal?
- Three, from companies registered for the same job, and ask each for a written breakdown. Quotes for the same house often differ by thousands because they include different work, not because one is dearer.
- Is this list in any order of merit?
- No. Companies based in Donegal come first, then the ones that travel to it, then One Stop Shops, then alphabetical. Being on the register means the paperwork is in order, not that the work is good.
Listed on SEAI’s public registers on 25 September 2026. Being registered is not an endorsement by SEAI or by us. Check the current register on seai.ie before you sign anything. Not affiliated with SEAI. On this list? Get homeowner plans to quote for
Updated · grants checked · register read 25 Sep 2026 · How we know · Corrections