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 Mayo?

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 Mayo 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 Mayo

201 companies on the SEAI register are based in or serve Mayo for windows and doors (register as of 8 September 2026).

A fitter seen from behind lifting a new window into an opening during a renovation. — Unrecognizable workman installing window in house during renovation process · Ksenia Chernaya · Pexels License · Photo credits

Based in Mayo

17 of them. Sorted by what they are registered for, then by name — this is not an order of merit.

Churchfield Home ServicesOne Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterSolar panelWindow and door
Nationwide · SEAI no. 10253 · Website
Based in Mayo.
AP Building Contractors Ltd
Attic insulationExternal wall insulationInternal wall insulationWindow and door
Based in Mayo · serves Connacht · SEAI no. 15010
Based in Mayo.
Carrabine Joinery Ltd
Window and door
Based in Mayo · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 19877
Based in Mayo.
Glenham Ltd
Window and door
Based in Mayo · serves Connacht · SEAI no. 19580
Based in Mayo.
Holmes Insulation LTD
Attic insulationCavity wall insulationInternal wall insulationWindow and door
Based in Mayo · serves Connacht · SEAI no. 10523
Based in Mayo.
Homergy Ltd T/AComfort Solutions Retrofit
Attic insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Based in Mayo · serves Connacht · SEAI no. 13882
Based in Mayo.
Mchale Windows Ltd
Window and door
Based in Mayo · serves Dublin, Leinster, Munster and Connacht · SEAI no. 19878
Based in Mayo.
Mcneela Windows & Doors Limited
Window and door
Based in Mayo · serves Connacht · SEAI no. 19835
Based in Mayo.
Modern Style Home
Window and door
Nationwide · SEAI no. 19913
Based in Mayo.
Oakwood Glazing Ltd Ta Grady Joinery
Window and door
Based in Mayo · serves Dublin, Leinster and Connacht · SEAI no. 19880
Based in Mayo.
Patrick Donegan Ta Senator Windows
Window and door
Based in Mayo · serves Connacht · SEAI no. 19609
Based in Mayo.
Rend Master Ltd
Attic insulationExternal wall insulationHeat pumpInternal wall insulationSolar panelWindow and door
Nationwide · SEAI no. 17925
Based in Mayo.
S Johnson Contractors T A West Of Ireland Windows
Window and door
Based in Mayo · serves Connacht · SEAI no. 19673
Based in Mayo.
Season Master
Window and door
Based in Mayo · serves Connacht · SEAI no. 19824
Based in Mayo.
Tmg Specialist Installations
Window and door
Based in Mayo · serves Munster and Connacht · SEAI no. 19900
Based in Mayo.
Vincent clarke
Window and door
Based in Mayo · serves Connacht · SEAI no. 19747
Based in Mayo.
Westport Windows And Doors Ltd
Window and door
Based in Mayo · serves Connacht · SEAI no. 19583
Based in Mayo.

Also cover Mayo from elsewhere (184)

These told SEAI they cover the province Mayo 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 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) · Cooper Insulation Ltd. (OSS) · Electric Ireland Superhomes (OSS) · Energyfix (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) · A1 Windows And Doors Limited · Advantage Energy Systems Ltd · AGI Construction Ltd · Aiden Mcguinness & Son Ltd · Aluminium A Rated Windows And Doors Ltd · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Apex Engineering · Ard Ri Aluminium · Aru Joinery Ltd · Athlone Windows · Atlantic Windows & Doors Ltd · Bc Top Contractors Limited Ta Bct Contractors · Bnm Construction Services Ltd · Brendan Sammon Aughnasheelin Ltd · Bright Vista Group Ltd. · Brusna Energy Solutions Ltd · Buckley Windows & Doors · C.G. Windows Ltd · Carlos Windows · Carlson & Co Ltd · CB Windows Ltd · City & Country Windows · Comway Ltd Trading As Home Improvements Ireland · Cozy Windows Limited · Cregan Windows Ltd T/A Senator Windows Galway · Crescent Windows And Doors · Cubo Rooflights Limited · Dalgan Windows Ltd · Darragh & Gregory Timoney Windows Ltd · David Donelan Ta Donelan Windows · Deerpark Windows Gateway Ltd · Denis Fahey Construction Ltd · Diarmuid O'Connell Carpentry Limited · Dillons Joinery & Engineering · Dovista Irl Ltd · Dublin Home Repair Limited · Dungarvan UPVC & Westgate Windows Limited · Dunne Ecofit Limited · Dunshaughlin Business Park · Eco Window Concepts Limited · Eitas · Energy Retrofit Ireland · Energy Saving Technologies Ltd T/A Energlaze · Farrell Windows And Doors Ltd · Fine Fenestration Limited Ta Woodmarq · Finestra Ltd. · Forde Brothers Ballinlough Ltd. · Fox Windows And Doors Limited · Frames Direct Uc · Geraghty Joinery · Gerard Moroney Carpentry And Construction · Glazewise Ltd · Glazing Spares And Repairs Ltd · Goode Energy · Gp Renovation · Grogan And Currid Ltd · Grzegorz Wolowiec · H&F Windows · Hanley Windows And Doors 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 · Innovate Build Greener Ltd · Interlux Ireland Limited · Jason Bracken Windows Ltd · Jb Windows & Doors · JJS Plumbing & Heating Limited · Jmc Windows & Doors Ltd · Joe Rowley Windows Ltd · Joe Walsh Window Repairs Ltd · John Greaney Building Contractor · Joseph O'Halloran & Sons Ltd · Jsa Windows And Doors · Just Joinery Ltd Ta Divine Ireland Windows & Doors · K&D Developments (Sligo) Ltd. · Kcb Windows And Doors · Kilcastle Construction Ltd · Killeen Composite Doors Limited · Km Concepts Ltd Trading As Fahy O Connor · Krb Windows · Kromac Construction Ltd · KWRS Ltd Kells Traditional Timber Windows & Doors · Larkin Aluminium Ltd · Lucan Windows And Doors · Lynch Windows Ltd · M&L Repairs Windows Doors · Mahon Windows Limited · Martin Windows Limited · Mcgorman Pvc Windows And Doors Ltd · Metro Insulation Ltd · Michael Plausin · Midwest Windows Ltd · Mike Doors & Windows · MMC Windows And Doors Ltd · Moanbaun Contracts Ltd · Modern Home Solutions · Modern Solutions Trade Windows & Doors · Moloney Builders · Montroy Sales Ltd Trading As All Ireland Doors & Windows · Muinin Contracts Ltd Trading As Senator Windows · Mulholland Windows & Doors Ltd · Munster Joinery (Ire) Unlimited Company · New Build Construction & Window Company · New Doors And Floors Limited · New Generation Doors Ltd · Niall O Shea Windows Limited · Nordan Vinduer Ireland Ltd · Norde Blinds & Interiors · Norlux Windows · Nrr Renovations Limited · O' Grady uPVC Ltd · O'Rourke Windows & Glass Ltd · Ogeetek Irl Ltd (Duane Consulting Ltd) · Pandg Callaghan Trading As Timeless Sash Windows Ltd · Pannoncelt Ltd · Patrick Hough · Peter Allen Windows And Doors · Physalia Ltd Ta Ecoaer · Premier Insulations · Prestige Windows And Doors · Pro Fit Pro Fix · Professional Solid Insulation · R Mcd Home Improvements Ltd · Raymond McSteen · Reene Developments · Retrofit Energy Ireland One Stop Shop Ltd · Revolution Doors & Windows Limited · Rio Ents Ltd ta A-Rate · Roscommon Windows Ltd · Ryan Spray Foam · Sean Doyle Windows Ltd · Sean Paul Construction Ltd · Silver Insight Limited T/A Quality Composite Doors · Sligo Glass Company Ltd. · Solaregy T/A Sola · Solid Insulation Systems Ireland Ltd · Sova Contracting Ltd Ta Perfect Home Windows · Sunshine Windows And Doors Ltd · Superior Trade Frames · Sustainable Warmth Ltd · T&Aglass · Teroco Windows And Doors Limited · The Door Centre Galway · The Period Door Company Ltd · The Window Doctor Ltd · Timoney Windows & Conservatories Ltd · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · Top Spec Windows Ltd · Triple Glazed Windows And Doors · Tulway Limited Trading As Wright Windows · Uab Termo Langai · Ucs Design Group Ireland Ltd · V Rocke Windows Ltd · Velux Co Ltd · Vincenttullyconstructionltd.T/A Tully Windows and doors · Vindr Vs Ltd · Warmcore Homes Ltd · Warmer Solutions · Weatherglaze Repairs Galway · Weatherproof Windows And Doors Ltd · Westcoast Pvc · Western Trade Frames Ltd · Westmeath Windows & Doors Limited · Windows & Rooflights Ltd

What it costs, and what the grant pays

The grant for a semi-detached house is €3,000. SEAI recorded a middle price of €9,085 for this work last year, which leaves about €6,085 for you to pay. These are national figures, not Mayo ones — SEAI does not publish prices by county.

This job has no SEAI median price; the cost above is an estimate.

What it costs on a home like yours, and what you are left paying

Before you sign

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

Ask up to five of them

Fill in one form, tick who you want to hear from, and we pass your details to those companies and nobody else. It costs nothing and you are under no obligation.

Get windows and doors quotes in Mayo

Common questions

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 Mayo?: 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 Mayo 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.

Other work in Mayo

Listed on SEAI’s public registers on 8 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.