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 Sligo?

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 Sligo 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 Sligo

200 companies on the SEAI register are based in or serve Sligo 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 Sligo

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

Atlantic Windows & Doors Ltd
Window and door
Based in Sligo · serves Connacht · SEAI no. 19710
Based in Sligo.
Bnm Construction Services Ltd
Attic insulationInternal wall insulationWindow and door
Based in Sligo · serves Dublin, Leinster and Connacht · SEAI no. 19458
Based in Sligo.
Brusna Energy Solutions Ltd
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Based in Sligo · serves Connacht · SEAI no. 10066
Based in Sligo.
Denis Fahey Construction Ltd
Attic insulationInternal wall insulationWindow and door
Based in Sligo · serves Connacht · SEAI no. 17900
Based in Sligo.
K&D Developments (Sligo) Ltd.
Attic insulationInternal wall insulationWindow and door
Based in Sligo · serves Dublin, Leinster, Munster and Connacht · SEAI no. 16119
Based in Sligo.
R Mcd Home Improvements Ltd
Window and door
Based in Sligo · serves Connacht · SEAI no. 19702
Based in Sligo.
Raymond McSteen
Window and door
Based in Sligo · serves Connacht · SEAI no. 20131
Based in Sligo.
Sligo Glass Company Ltd.
Window and door
Based in Sligo · serves Connacht · SEAI no. 19761
Based in Sligo.
Westcoast Pvc
Window and door
Based in Sligo · serves Connacht · SEAI no. 19546
Based in Sligo.

Also cover Sligo from elsewhere (191)

These told SEAI they cover the province Sligo 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) · 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) · 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 · AP Building Contractors Ltd · Apex Engineering · Ard Ri Aluminium · Aru Joinery Ltd · Athlone Windows · Bc Top Contractors Limited Ta Bct Contractors · Brendan Sammon Aughnasheelin Ltd · Bright Vista Group Ltd. · Buckley Windows & Doors · C.G. Windows Ltd · Carlos Windows · Carlson & Co Ltd · Carrabine Joinery 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 · 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 · Glenham 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 · Holmes Insulation LTD · Home Building Solutions T/A HBS Elegant build Ltd · Homergy Ltd T/AComfort Solutions Retrofit · 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 · 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 · Mchale Windows Ltd · Mcneela Windows & Doors Limited · 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 · Modern Style Home · 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 · Oakwood Glazing Ltd Ta Grady Joinery · Ogeetek Irl Ltd (Duane Consulting Ltd) · Pandg Callaghan Trading As Timeless Sash Windows Ltd · Pannoncelt Ltd · Patrick Donegan Ta Senator Windows · Patrick Hough · Peter Allen Windows And Doors · Physalia Ltd Ta Ecoaer · Premier Insulations · Prestige Windows And Doors · Pro Fit Pro Fix · Professional Solid Insulation · Reene Developments · Rend Master Ltd · Retrofit Energy Ireland One Stop Shop Ltd · Revolution Doors & Windows Limited · Rio Ents Ltd ta A-Rate · Roscommon Windows Ltd · Ryan Spray Foam · S Johnson Contractors T A West Of Ireland Windows · Sean Doyle Windows Ltd · Sean Paul Construction Ltd · Season Master · Silver Insight Limited T/A Quality Composite Doors · 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 · Tmg Specialist Installations · 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 · Vincent clarke · Vincenttullyconstructionltd.T/A Tully Windows and doors · Vindr Vs Ltd · Warmcore Homes Ltd · Warmer Solutions · Weatherglaze Repairs Galway · Weatherproof Windows And Doors Ltd · Western Trade Frames Ltd · Westmeath Windows & Doors Limited · Westport Windows And Doors Ltd · 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 Sligo 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 Sligo

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 Sligo?: 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 Sligo 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 Sligo

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.