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 Cavan?

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 Cavan 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.

External wall insulation installers in Cavan

79 companies on SEAI's register say they do external wall insulation in Cavan. Only work by a registered company gets the SEAI grant.

7 are based in Cavan; the other 72 cover it from elsewhere.
The grant for a semi-detached house is €6,000. SEAI’s middle price last year was €23,219.
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.

A terrace of single-storey homes under scaffolding and pink debris netting, the roof stripped back. — A terrace of bungalows under scaffolding for wall insulation. Photographed in Hull, England.
Garrick Close, Kingston upon Hull: bungalow renovations, September 2023 · Hullian111 · CC BY-SA 4.0

See your grants for wall insulation, and what you’d pay

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About 10 seconds. See your numbers first, then get quotes if you want them.

Based in Cavan

7 of them, from SEAI's register (read 25 September 2026). Not an order of merit. Published figure

Breffni Insulation LtdOne Stop ShopAttic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and doorBased in Cavan · and 24 other counties · SEAI no. 10013 · WebsiteBased in Cavan.
Greenwatt LtdOne Stop ShopAttic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and doorNationwide · SEAI no. 17045 · WebsiteBased in Cavan.
Decarb Contracts LtdAttic insulationExternal wall insulationInternal wall insulationBased in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17881Based in Cavan.
Green - Lux Construction LtdAttic insulationExternal wall insulationInternal wall insulationBased in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17819Based in Cavan.
JJR Insulation LtdAttic insulationExternal wall insulationInternal wall insulationWindow and doorBased in Cavan · serves Dublin and Ulster · SEAI no. 17274Based in Cavan.
McMorrow Renewables LimitedAttic insulationExternal wall insulationInternal wall insulationBased in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17501Based in Cavan.
Seamus O'ReillyAttic insulationExternal wall insulationInternal wall insulationBased in Cavan · serves Dublin, Leinster and Ulster · SEAI no. 17130Based in Cavan.

Also cover Cavan from elsewhere (72)

These told SEAI they cover the province Cavan 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.

Activ8 Energies (OSS) · Ashgrove Engineering Ltd T/A Ashgrove Renewables (OSS) · Bayview Contracts Ltd (OSS) · Bord Gais Energy Ltd (OSS) · Churchfield Home Services (OSS) · Cooper Insulation Ltd. (OSS) · Electric Ireland Superhomes (OSS) · Energyfix (OSS) · Envirobead Ltd. (OSS) · Home Comfort Retrofits 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) · Algricris Construction Ltd · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Ap Eco Building & Renovation · B. Donaghey & Sons · BCBAL Ltd T/A McGee Insulation · Bluebuild Renewables Ltd · Carrickmaquigley Construction Ltd · Ciocan Construction Ltd · Comfort Living Limited · CW Xterior Solutions Ltd · D Carry Construction · DC Energy Solutions · Derchil Limited t/a CosiHomes · Derryveagh Contracts Ltd · DMT Renewables Ltd · Ds Fallon · Duey Brothers Ltd · Eco Pro Insulation · Eco Smart External Insulation Ltd · Eco Thermal Homes · Floelen Construction Ltd · Gmg Contracts Ltd · Green Air Technologies Ltd · Hamkel Holdings Ltd / Soltherm · Home Building Solutions T/A HBS Elegant build Ltd · Insulate Ireland · Jacob Insulation Limited · Johnathan Timoney T/A Rendpro Ltd · Kilsarn Warmer Homes · Leitrim Warmer Homes CLG · Madden Developments Ltd · Mc Menamin Building Contractors Ltd · McCaher Construction Ltd. · Meegan Insulations · Metro Insulation Ltd · MS Plastering Contractor · Multi Wrap Ltd · National Retrofit & Construction Services Ltd · Pa Home Renovations · Pro Walls Ltd · Rend Master Ltd · Rio Ents Ltd ta A-Rate · Rmn Developments Ltd · SBN Solid Home Ltd · Solar Direct Ltd. · Solaregy T/A Sola · Solid Insulation Systems Ireland Ltd · Sovereign Finishes Limited · Superior Insulations Ltd · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · TLI Group Ltd T/A Transmission Links Ireland Ltd · Tomasz Rulak T/A Tombet Building · Tuatha Construction

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.

Check my home

The detail

How Cavan compares

External wall insulation installers who say they work in each county, from SEAI's register. Published figure

Figure 1Published figure

79 external wall insulation installers say they work in Cavan; the median county has 132

Cavan is 24th of 26. The most list Dublin (175); the fewest, Donegal (76). 21 One Stop Shops list Cavan.

Cavan79
The median county132
Most: Dublin175
Fewest: Donegal76

Each bar counts companies on SEAI's register that list the county for external 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 Cavan ones: SEAI does not publish prices by county. SEAI rule

On a semi-detached house, SEAI's middle price of €23,219 less the grant leaves €17,219 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.

How the application works →

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 Cavan?: 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 Cavan 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 5 October 2026 · grants checked 10 Oct 2026 · register read 25 Sep 2026 · How we know · Corrections