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.

Window and door installers in Cavan

136 companies on SEAI's register say they do windows and doors in Cavan. Only work by a registered company gets the SEAI grant.

11 are based in Cavan; the other 125 cover it from elsewhere.
The grant for a semi-detached house is €3,000. SEAI’s middle price last year was €7,110.
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 fitter seen from behind lifting a new window into an opening during a renovation. — A fitter lifting a new window into place during a renovation.
Unrecognizable workman installing window in house during renovation process · Ksenia Chernaya · Pexels License

See your grants for windows and doors, and what you’d pay

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Based in Cavan

11 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.
Cavan Glass By DesignWindow and doorBased in Cavan · serves Leinster and Ulster · SEAI no. 19830Based in Cavan.
Darragh & Gregory Timoney Windows LtdWindow and doorBased in Cavan · serves Dublin, Connacht and Ulster · SEAI no. 19671Based in Cavan.
JJR Insulation LtdAttic insulationExternal wall insulationInternal wall insulationWindow and doorBased in Cavan · serves Dublin and Ulster · SEAI no. 17274Based in Cavan.
Joe Rowley Windows LtdWindow and doorBased in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 19511Based in Cavan.
Lynch Windows CavanWindow and doorBased in Cavan · serves Ulster · SEAI no. 20052Based in Cavan.
Mk Living Designs LtdWindow and doorBased in Cavan · serves Dublin and Ulster · SEAI no. 19659Based in Cavan.
Muinin Contracts Ltd Trading As Senator WindowsWindow and doorBased in Cavan · serves Leinster, Connacht and Ulster · SEAI no. 19522Based in Cavan.
Rb GlazingWindow and doorBased in Cavan · serves Ulster · SEAI no. 20005Based in Cavan.
Wedlock Windows LtdWindow and doorBased in Cavan · serves Dublin, Leinster and Ulster · SEAI no. 19545Based in Cavan.

Also cover Cavan from elsewhere (125)

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) · AGI Construction Ltd · Aiden Mcguinness & Son Ltd · Allied Irish Property Ltd · Anchor Windows · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Apex Engineering · Aru Joinery Ltd · B. Donaghey & Sons · Bc Top Contractors Limited Ta Bct Contractors · Bluebuild Renewables Ltd · Brownes Upvc · C.G. Windows Ltd · Carlson & Co Ltd · Carrabine Joinery Ltd · Castle Windows · Cmg Windows · Coastal Windows & Doors · Cozy Windows Limited · Cubo Rooflights Limited · D Carry Construction · Dovista Irl Ltd · Dublin Home Repair Limited · Dungarvan UPVC & Westgate Windows Limited · Dunshaughlin Business Park · Eitas · Energy Saving Technologies Ltd T/A Energlaze · Eoin Kelly And Sons · Errigal Windows & Glazing · Fine Fenestration Limited Ta Woodmarq · Flanagan Upvc · Frames Direct Uc · Franmac · G. Kilpatrick Windows Ltd · Galbraith Construction Ltd · Gavin McGonagle Windows · Geraghty Joinery · Gill Windows · Gortahork Windows · Gp Renovation · Grogan And Currid Ltd · Halpin Aluminium & Upvc Ltd · Harstaf Vinduer Ltd · High Prospects Limited · Home Building Solutions T/A HBS Elegant build Ltd · Inframe Windows And Doors Ltd · Inniskeen UPVC & Aluminium Ltd · Interlux Ireland Limited · Jmc Windows & Doors Ltd · Joe Mcdaid Ltd · Jsa Windows And Doors · Lucan Windows And Doors · Lynch Windows Ltd · M&L Repairs Windows Doors · Mallon Windows & Doors · Malone Windows Limited · Martin Conservatories · Martin Windows Limited · Mc Menamin Building Contractors Ltd · Mcgorman Pvc Windows And Doors Ltd · McNamee Window Systems Ltd · Metro Insulation Ltd · Mike Doors & Windows · Modern Home Solutions · Modern Solutions Trade Windows & Doors · Modern Style Home · Montroy Sales Ltd Trading As All Ireland Doors & Windows · Munster Joinery (Ire) Unlimited Company · New Generation Doors Ltd · Nordan Vinduer Ireland Ltd · Norlux Windows · Novus Windows Limited · O'Rourke Windows & Glass Ltd · Padraic Costello Upvc Windows & Door · Pandg Callaghan Trading As Timeless Sash Windows Ltd · Pannoncelt Ltd · Pat Kelly & Sons · Pauric Neely · Perfect Fit Modular Ltd Ta Perfect Fit Windows & D · Physalia Ltd Ta Ecoaer · Pml Windows And Doors · Premier Insulations · Premier Solutions NW Ltd · Prestige Windows And Doors · Rend Master Ltd · Retrofit Energy Ireland One Stop Shop Ltd · Revolution Doors & Windows Limited · Rio Ents Ltd ta A-Rate · Silver Insight Limited T/A Quality Composite Doors · Solaregy T/A Sola · Solid Insulation Systems Ireland Ltd · Sustainable Warmth Ltd · T Patton And Son Ltd · T&Aglass · Teroco Windows And Doors Limited · The Professionals · Timoney Windows & Conservatories Ltd · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · Tpd Windows · Triple Glazed Windows And Doors · Uab Termo Langai · Ucs Design Group Ireland Ltd · Velux Co Ltd · Vindr Vs Ltd · Wds Valerii Hutsko Limited · Weatherproof Windows And Doors Ltd · WindowKerr

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The detail

How Cavan compares

Window and door installers who say they work in each county, from SEAI's register. Published figure

Figure 1Published figure

136 window and door installers say they work in Cavan; the median county has 276

Cavan is 24th of 26. The most list Kildare, Kilkenny and Wicklow (383); the fewest, Donegal (133). 21 One Stop Shops list Cavan.

Cavan136
The median county276
Most: Kildare, Kilkenny and Wicklow383
Fewest: Donegal133

Each bar counts companies on SEAI's register that list the county for windows and doors. 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 €7,110 less the grant leaves €4,110 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