Installers · Donegal · SEAI registers read 25 Sep 2026
679 SEAI-registered contractors say they work in Donegal
679 companies on SEAI’s registers say they work in Donegal (read 25 September 2026). 145 are based in the county, 516 cover it from elsewhere and 18 are One Stop Shops from elsewhere. Firms often tick a whole province, so the count is regional. Registration is a fact about paperwork, not a review of their work.
Houses round a green in the Old Town estate, Letterkenny, Co. Donegal. Detached houses built 1990–2004 are the commonest home sold or let in Donegal.
Landscaped road island in the Old Town housing estate, Letterkenny · Humphrey Bolton · CC BY-SA 2.0
679
Companies that say they work here
SEAI registers · read 25 Sep 2026
Published figure25th of 26 for companies
145
Based in Donegal
The address on the register
Published figure4th of 26 for firms based in the county
18
One Stop Shops that list it
SEAI One Stop Shop register
Published figure22nd of 26 for One Stop Shops
138
Heat pump installers who say they work here
SEAI home energy register · read 25 Sep 2026
Published figure26th of 26 for heat pumps
Updated · registers read 25 Sep 2026 · How we know · Corrections
Where this sits · the grant steps
Every SEAI grant runs the same six steps. SEAI won't pay for work that starts before it approves.
- Assessa BER, or a home energy assessment
- Applyonline, before any work starts
- ApproveSEAI's offer lasts 8 months
- Worksby an SEAI-registered contractor
- Claimpost-works BER and forms
- Paid4–6 weeks after complete paperwork
- The idea behind itApply, approve, works and payment are different steps
- You are hereInstallers in Donegal
- Next questionShould you manage it yourself or use a One Stop Shop?
Who says they work in Donegal, by job
Based in Donegal first, then firms that travel to it, then One Stop Shops, then by name. Not an order of merit. Published figure
Attic insulation installers in Donegal
211 registered for attic insulation · 80 based in Donegal
- A1 Plumbing & Heating
- Abhaile Carpentry And Construction Ltd
- AC Insulation
- Anthony Quinn Construction Ltd
- B. Donaghey & Sons
- BCBAL Ltd T/A McGee Insulation
- BCD Contracting Ltd
- Bio Insulate Ltd
Know the jobs before you call a firm in Donegal
See your grants, and what you’d pay.
About 10 seconds. See your numbers first, then get quotes if you want them.
Cavity wall insulation installers in Donegal
48 registered for cavity wall insulation · 7 based in Donegal
- AC Insulation
- BCBAL Ltd T/A McGee Insulation
- Bio Insulate Ltd
- Ecotech Contracts IRI Ltd
- Gallen Insulation Ltd
- Premier Solutions NW Ltd
- Tirconaill Contracts Ltd T/A Mc Taggart Insulation
- Ashgrove Engineering Ltd T/A Ashgrove RenewablesOne Stop Shopfrom CorkWebsite
Internal wall insulation installers in Donegal
196 registered for internal wall insulation · 76 based in Donegal
- Abhaile Carpentry And Construction Ltd
- AC Insulation
- Anthony Quinn Construction Ltd
- B. Donaghey & Sons
- BCBAL Ltd T/A McGee Insulation
- BCD Contracting Ltd
- Braecon Construction Ltd
- Brendan Mcgrenaghan Construction
External wall insulation installers in Donegal
76 registered for external wall insulation · 12 based in Donegal
- B. Donaghey & Sons
- BCBAL Ltd T/A McGee Insulation
- Carrickmaquigley Construction Ltd
- Derryveagh Contracts Ltd
- DMT Renewables Ltd
- Duey Brothers Ltd
- Insulate Ireland
- Johnathan Timoney T/A Rendpro Ltd
Window and door installers in Donegal
133 registered for windows and doors · 26 based in Donegal
- Aiden Mcguinness & Son Ltd
- Anchor Windows
- B. Donaghey & Sons
- C.G. Windows Ltd
- Cmg Windows
- Coastal Windows & Doors
- Errigal Windows & Glazing
- Frames Direct Uc
Heat pump installers in Donegal
138 registered for heat pumps · 40 based in Donegal
- A1 Plumbing & Heating
- Adrian Sweeney Plumbing & Heating Contractors
- Bernard Mc Elhinney Plumbing & Heating Contractor
- Carnamoyle Renewables Ltd
- CTI Teo T/A Gallagher Heating Systems
- Daigon Ltd
- Damien Barron
- DMT Renewables Ltd
Solar panel installers in Donegal
285 registered for solar panels · 10 based in Donegal
- Efficient Renewables Ltd
- Ferm Eng Ltd
- Grants Electrical Services LTD
- Kelly Electrical Services Ltd
- Martin Diver Electrical LTD
- McCaffrey Mechanical Services Ltd.
- Paul Gallagher
- Penrose Electrical Ltd
Heating controls installers in Donegal
136 registered for heating controls · 33 based in Donegal
- A1 Plumbing & Heating
- Adrian Sweeney Plumbing & Heating Contractors
- Apex Renewables
- Bernard Mc Elhinney Plumbing & Heating Contractor
- CTI Teo T/A Gallagher Heating Systems
- Daask Build Ltd
- DMT Renewables Ltd
- Efficient Renewables Ltd
Solar hot water installers in Donegal
57 registered for solar hot water · 5 based in Donegal
How Donegal compares with the other counties
Each job's count against the median county's. Published figure
138 heat pump installers say they work in Donegal; the median county has 279
Donegal is 26th of 26 for heat pumps and 25th for companies of every kind. 145 are based here, 4th of 26.
Each bar is Donegal's count for that job, on a scale to the county with the most; the tick is the median county. Many firms tick a whole province, so counts move in regional steps, and neighbouring counties often share a step. A count is choice, not capacity.
Sources: SEAI home energy, One Stop Shop and solar registers, read 25 Sep 2026
The numbers
| Job | Donegal | Median county | Rank of 26 |
|---|---|---|---|
| Heat pumps | 138 | 279 | 26th |
| Attic insulation | 211 | 343 | 26th |
| Cavity wall insulation | 48 | 87 | 26th |
| Internal wall insulation | 196 | 323 | 26th |
| External wall insulation | 76 | 132 | 26th |
| Windows and doors | 133 | 276 | 26th |
| Solar panels | 285 | 319 | 25th |
| One Stop Shops | 18 | 24 | 22nd |
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.
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
See your grants and what you’d pay
Four questions about your home, then your numbers. Get quotes from registered contractors if you want them.
Updated · registers read 25 Sep 2026 · How we know · Corrections