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.

Internal wall insulation installers in Mayo

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

Insulation boards fixed to the outside walls of a terrace mid-job, meter boxes hanging clear of the wall. — Garrick Close, Kingston upon Hull: bungalow renovations, November 2023 · Hullian111 · CC BY-SA 4.0 · Photo credits

Based in Mayo

51 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.
Beechgrove Developments Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 13968
Based in Mayo.
Bluerock Property Services Limited
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 20084
Based in Mayo.
Brendan Roche
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 19445
Based in Mayo.
Brian Forkan Carpentry & Construction
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 15540
Based in Mayo.
C S Moran Bros Builders Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 17610
Based in Mayo.
Caherdun Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 11573
Based in Mayo.
Carrowgarve Construction
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 19455
Based in Mayo.
Castlelough Corporation Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 16977
Based in Mayo.
Clar ICH Ltd
Attic insulationCavity wall insulationInternal wall insulation
Nationwide · SEAI no. 12879
Based in Mayo.
Clydesdale Construction Co. Ltd.
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 18032
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.
Dermot Moyles Construction Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 20012
Based in Mayo.
DMC mechanical construction ltd
Attic insulationHeat pumpHeating controlsInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 16715
Based in Mayo.
E.C.S.C Insulation Services Ltd
Attic insulationCavity wall insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 17934
Based in Mayo.
Eamonn Finn
Attic insulationCavity wall insulationInternal wall insulation
Based in Mayo · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 18329
Based in Mayo.
Gerry Mchale Plumbing & Construction Contractors
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Mayo · serves Connacht · SEAI no. 11937
Based in Mayo.
GM Barrett Construction Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 20117
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.
Howard Healy And Sons Contractors Ltd
Internal wall insulation
Based in Mayo · serves Connacht · SEAI no. 18025
Based in Mayo.
James Heneghan Electrical Plumbing And Heating
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Mayo · serves Connacht · SEAI no. 13100
Based in Mayo.
Joe Gavin Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Mayo · serves Connacht · SEAI no. 11267
Based in Mayo.
John Healy Construction Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 10046
Based in Mayo.
Judge Brothers Ltd
Attic insulationHeating controlsInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 10453
Based in Mayo.
Kenmore Builders
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 17142
Based in Mayo.
Kirrane Engineering Limited
Internal wall insulation
Based in Mayo · serves Leinster, Munster and Connacht · SEAI no. 17950
Based in Mayo.
Maloney Quarries Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 19441
Based in Mayo.
Michael Cawe (Suspended Ceilings) Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 11095
Based in Mayo.
Micheal Golden Construction Ltd
Internal wall insulation
Based in Mayo · serves Connacht · SEAI no. 17067
Based in Mayo.
Oak Barn Construction Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 14897
Based in Mayo.
P.J. McHale
Heat pumpHeating controlsInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 10105
Based in Mayo.
Paraic O'Brien Construction
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 12106
Based in Mayo.
Pbrogan Plastering Ltd
Internal wall insulation
Based in Mayo · serves Connacht · SEAI no. 18199
Based in Mayo.
Peter Fallon & Sons Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 12677
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.
Restore Building Company Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Dublin and Connacht · SEAI no. 17813
Based in Mayo.
Ronan Devers Plastering
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 19343
Based in Mayo.
Ruane Insulation Ltd T/A Better Energy Solutions
Attic insulationCavity wall insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 16390
Based in Mayo.
Seamus O'Brien & Sons Builders (Castlebar) Ltd
Attic insulationHeating controlsInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 10986
Based in Mayo.
Sean Lydon
Internal wall insulation
Based in Mayo · serves Connacht · SEAI no. 17677
Based in Mayo.
Shane Langan Construction Ltd
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 18173
Based in Mayo.
SKD Construction
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 20123
Based in Mayo.
SLP Westport
Attic insulationInternal wall insulation
Nationwide · SEAI no. 19395
Based in Mayo.
Superior Insulations Ltd
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulation
Nationwide · SEAI no. 15150
Based in Mayo.
Unyte Solutions
Attic insulationInternal wall insulation
Based in Mayo · serves Connacht · SEAI no. 20026
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 (251)

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) · AB Teague Enterprises Ltd · Abbey View Construction Lmited · Absolute Acrylics Ltd · Absolute Insulation Ltd · AC Insulation · AGI Construction Ltd · Airpacks T/A Kore Insulation · Airtight Eco Build Ltd · Alex Building Services · All In Insulation · Alpha Insulation Ltd T/A Western Insulation · Annex Building Renovation Ltd · Anthony Brady Plumbing Limited · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Anthony Quinn Construction Ltd · AO Electrical And Solar Ltd · Ap Eco Building & Renovation · Apex Engineering · Athlone Windows · Auro Naes Ltd T/A Roesavin Construction · Ballinderry Developments Ltd T/A Rebuild · Ballyhogan Plumbing Services Ltd · Barry Kiernan Construction Ltd · Bd Partitions + Ceilings Ltd · Belville Carpentry and Construction Ltd · Blackstrand Retrofit Ltd. · Bnm Construction Services Ltd · Brendan Flynn · Brendan Sammon Aughnasheelin Ltd · Brendave Developments · Brian Smith Heating & Plumbing Ltd · Bromur Energy Ltd · Brusna Energy Solutions Ltd · C.D.M. Contracts Ltd · Caherass Plastering Ltd · Carrowmore Construction Ltd · Castleconnor Construction Ltd · Cellulose Insulation Ltd · Century Retrofit Ltd · Ciocan Construction Ltd · CJH Construction · Clai Ard Construction Ltd. · Clioma House Ltd · Conneally Painting & Sons Trading As Conneally Group · Connole Construction Ltd · Cornacloy Construction Ltd · Corrib View Construction Ltd · CW Xterior Solutions Ltd · Dalmoy Limited · Dask Construction Limited T/A Taylor Con & C W · David Flaherty Construction LTD · DC Energy Solutions · Dcb Duffy Carpentry & Building Ltd · Decarb Contracts Ltd · Declan Fahy Plastering LTD · Declan Taylor Carpentry & Building · Denis Fahey Construction Ltd · Denrich Developments · Derchil Limited t/a CosiHomes · Diarmuid O'Connell Carpentry Limited · Dkc Carpentry & Construction Ltd · DMT Renewables Ltd · Dncf · Doonshore Waterside Ltd · Doorus Construction Ltd · Downes Construction · Dromahair Tully Construction Ltd · Ds Fallon · Dt Gorman Developments Ltd · Duane Construction Limited · Dublin All Trades Building Services · Duey Brothers Ltd · Dunne Drylining Ltd · E Ansbro Construction LTD · Eco Home Insulation · Eco Pro Insulation · Eco Smart External Insulation Ltd · Eco Thermal Homes · Ecowise Insulation Ltd · Ecowrap · Edward Eccleston · Egan Mulready Developments Ltd · Eitas · Elem Construction Ltd T/A Inish Contracts · Ely Houseworks Ltd · Energy Retrofit Ireland · Energywise Savings Ireland Ltd · Evertherm Ltd T/A Annalee Energy Ltd · External Insulation Plastering Ltd · EZ Build · Fahy Insulations Ltd · Ferm Eng Ltd · Finbarr McMahon Carpentry/Construction · Finlay EcoFit Tullamore Ltd · Firetech Experts Ltd · Fitzpatrick Plumbing & Heating Contractors Ltd · Floelen Construction Ltd · Forma Design & Build Ltd · G & S Construction & Plant Hire Limited · G.V.Services Limited · Gary Smyth Construction And Services Limited · Gleoite Homes Ltd · Gmg Contracts Ltd · Goldcross Developments Ltd · Goode Energy · Goodmar Construction Ltd · Gr Carpentry Ltd · Grainger Energy Solutions Ltd · Green - Lux Construction Ltd · Green Air Technologies Ltd · Hamkel Holdings Ltd / Soltherm · Harbour Crest Developments Ltd · Harrington Hbrs Ltd · Harrington Insulations Limited · Home Building Solutions T/A HBS Elegant build Ltd · HUGH MCGOWAN BUILDING SERVICES LIMITED · Ian O Donoghue Builders Limited · Inline Construction and Custom Carpentry Ltd · Innovate Insulation Ltd · Insulate Ireland · J Shaw Carpentry Ltd · Jacob Insulation Limited · James Keenan Eco Limited T/A Keenan Eco · Jason Kennedy Construction Ltd · Jb Windows & Doors · Jf Fordham Construction Ltd · Joe Dunican Plumbing And Heating Ltd · John Carty & Sons Ltd · John Crean Construction Limited · John Doohan and Company Ltd · John Joe Faherty · John O'Loughlin & Son Ltd · John Paul Lardner Carpentry · John Ryan Construction Ltd. · Johnathan Timoney T/A Rendpro Ltd · K K Home & Building Services Ltd · K&D Developments (Sligo) Ltd. · Kelly Construction Gort Ltd · Kelly Insulation Heating & Plumbing · Kesel Construction Ltd · Kevin Conneely Construction · Kg Future Homes Limited · Kh Energy Services Limited · Kilcastle Construction Ltd · Kilmallock Developments Ltd · Kilsarn Warmer Homes · Kingscourt Insulation Ltd · Leitrim Warmer Homes CLG · Leslie Hamilton Construction · Lynwood Construction Ltd · M&W Fire Solutions Ltd · Mac West Construction Ltd · Madden Developments Ltd · Magical Reconstruction Ltd · Markaye Contracts Ltd · Matthew Rice T/A Mattie Rice Carpentry · McCaher Construction Ltd. · McInerney and Keane Insulation · McMorrow Renewables Limited · McNabola Brothers.Ltd · McNena Construction Ltd · Melmc Construction Ltd · Metro Utilities Ltd T/A Metro Developments · Michael Kelly Glebe Builders Ltd · Michael Plausin · Midland Suspended Ceilings Ltd · Midland Warmer Homes Company Limited · Mjkhomes Galway Ltd · MMED Construction Services Ltd · Mountain View Construction Ltd · MS Plastering Contractor · Muggivan Brothers Construction Ltd · Multi Corp Construction Services Ltd · Mulway Construction Limited · Namloc Const Ltd T/A Coleman Bros Construction · Nc Carpentry & Construction Ltd · Niatara Construction Ta Apollo Insulation · North West Retrofit · Nrr Renovations Limited · O'Loughlin Construction · OCI Insulation · Ora Timber Frame · Oriel Insulations · Orm Contractors Ltd · P Mcgovern & Son Construction Ltd · Paddy Kilduff and Sons Builders Ltd TA Kilduff Con · Padraig Brady Carpentry Limited · Parker Construction Ltd · Pat Loftus Construction Ltd · Paul O'Connor · PC Civils Limited · PDJ Construction · Peter Brereton Plastering · Peter McKiernan Construction & Engineering · Peter Oneill Construction Ltd · Phelan Construction · Poly Coating and Sealing Ltd · PPGIH Business Ltd t/a Premier Irish Homes · Premier Insulations · Professional Solid Insulation · Raphael Considine Construction · Raphael Murray Plastering & EWI · Reality Renovations Ltd · Redfern Construction Ltd · Renova · Retrofit Energy Ireland One Stop Shop Ltd · Rio Ents Ltd ta A-Rate · RMC Ecobuild Ltd · Rmn Developments Ltd · Ryan Spray Foam · SBN Solid Home Ltd · Seamus Ryan Roofing Ltd · Sean Paul Construction Ltd · Smyth Project Management Ltd. T/A Teknabuild · Solaregy T/A Sola · Solaris Green Energy · Solid Insulation Systems Ireland Ltd · Sovereign Finishes Limited · Spreadwell Construction Ltd · Ss Drylining & Plastering Ltd · Stephen Doherty · Steve Moylan Limited · Sustainable Warmth Ltd · Swallow Building And Construction Ltd · T Insulations · Tamburah Limited · Timahoe Construction T/A Leinster Property Service · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · TLI Group Ltd T/A Transmission Links Ireland Ltd · Tomasz Rulak T/A Tombet Building · Treacon Carpentry & Building Services Ltd · TS Gormley Construction Ltd · Verde Remediation Services Ltd

What it costs, and what the grant pays

The grant for a semi-detached house is €3,500. SEAI recorded a middle price of €10,420 for this work last year, which leaves about €6,920 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 internal 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.