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.

External wall insulation installers in Mayo

106 companies on the SEAI register are based in or serve Mayo for external wall insulation (register as of 8 September 2026).

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

Based in Mayo

11 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.
Costello Insulation LTD
Attic insulationExternal wall insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 14111
Based in Mayo.
Damien Ryan Contracts Ltd
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulation
Based in Mayo · serves Dublin, Leinster, Munster and Connacht · SEAI no. 14637
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.
Moran Retrofit Solutions
Attic insulationCavity wall insulationExternal wall insulation
Based in Mayo · serves Dublin, Leinster, Munster and Connacht · SEAI no. 17912
Based in Mayo.
Proconstruct Limited
Attic insulationExternal wall insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 18007
Based in Mayo.
Rend Master Ltd
Attic insulationExternal wall insulationHeat pumpInternal wall insulationSolar panelWindow and door
Nationwide · SEAI no. 17925
Based in Mayo.
Superior Insulations Ltd
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulation
Nationwide · SEAI no. 15150
Based in Mayo.
Walter Moran Insulation
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 10082
Based in Mayo.
Winters Construction
Attic insulationExternal wall insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 17844
Based in Mayo.

Also cover Mayo from elsewhere (95)

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) · Absolute Acrylics Ltd · Algricris Construction Ltd · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Ap Eco Building & Renovation · AR Plastering Ltd · Ballinderry Developments Ltd T/A Rebuild · Brusna Energy Solutions Ltd · Century Retrofit Ltd · Ciocan Construction Ltd · CJH Construction · Connacht/Galway External Insulation Ltd · Cornacloy Construction Ltd · CW Xterior Solutions Ltd · David Flaherty Construction LTD · DC Energy Solutions · Decarb Contracts Ltd · Declan Fahy Plastering LTD · Derchil Limited t/a CosiHomes · DMT Renewables Ltd · Dromahair Tully Construction Ltd · Ds Fallon · Dublin All Trades Building Services · Duey Brothers Ltd · Eco Pro Insulation · Eco Smart External Insulation Ltd · Eco Thermal Homes · Ecowrap · Energy Retrofit Ireland · External Insulation Plastering Ltd · Finlay EcoFit Tullamore Ltd · Floelen Construction Ltd · G.V.Services Limited · Gmg Contracts Ltd · Grainger Energy Solutions Ltd · Green - Lux Construction Ltd · Green Air Technologies Ltd · Hamkel Holdings Ltd / Soltherm · Harrington Insulations Limited · Home Building Solutions T/A HBS Elegant build Ltd · Inline Construction and Custom Carpentry Ltd · Insulate Ireland · Jacob Insulation Limited · John Doohan and Company Ltd · Johnathan Timoney T/A Rendpro Ltd · Kilmallock Developments Ltd · Kilsarn Warmer Homes · Leitrim Warmer Homes CLG · Madden Developments Ltd · Marcus Turner · McCaher Construction Ltd. · McMorrow Renewables Limited · Metro Insulation Ltd · MS Plastering Contractor · National Retrofit & Construction Services Ltd · Novin Consultants Ltd · Nrr Renovations Limited · OCI Insulation · Pa Home Renovations · Paddy Kilduff and Sons Builders Ltd TA Kilduff Con · Pentico Contracting Ltd · Peter Brereton Plastering · Philip Reynolds · Professional Solid Insulation · Raphael Considine Construction · Raphael Murray Plastering & EWI · RMC Ecobuild Ltd · Rmn Developments Ltd · SBN Solid Home Ltd · Sean Paul Construction Ltd · Solaregy T/A Sola · Solid Insulation Systems Ireland Ltd · Sovereign Finishes Limited · Spreadwell Construction Ltd · Steve Moylan Limited · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · TLI Group Ltd T/A Transmission Links Ireland Ltd · Tomasz Rulak T/A Tombet Building

What it costs, and what the grant pays

The grant for a semi-detached house is €6,000. SEAI recorded a middle price of €23,247 for this work last year, which leaves about €17,247 for you to pay. These are national figures, not Mayo ones — SEAI does not publish prices by county.

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 external wall insulation 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.