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.

Solar hot water installers in Mayo

91 companies on the SEAI register are based in or serve Mayo for solar hot water (register as of 8 September 2026).

Based in Mayo

12 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.
Airsol Renewable Solutions Ltd
Heat pumpSolar hot waterSolar panel
Based in Mayo · serves Connacht · SEAI no. 17903
Based in Mayo.
G. Traynor & Sons Ltd
Heat pumpHeating controlsSolar hot water
Based in Mayo · serves Connacht · SEAI no. 11170
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.
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.
James Donnelly Eco Heating Ltd
Heat pumpHeating controlsSolar hot water
Nationwide · SEAI no. 13989
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.
Joseph Sheridan
Heat pumpHeating controlsSolar hot water
Based in Mayo · serves Connacht · SEAI no. 18062
Based in Mayo.
Kevin Durkin Heating And Plumbing Services
Heat pumpHeating controlsSolar hot water
Based in Mayo · serves Connacht · SEAI no. 12819
Based in Mayo.
McHugh Heating & Plumbing Ltd
Heat pumpHeating controlsSolar hot water
Based in Mayo · serves Connacht · SEAI no. 16003
Based in Mayo.
McManamon Mechanical Services Ltd
Heat pumpHeating controlsSolar hot water
Based in Mayo · serves Dublin, Leinster, Munster and Connacht · SEAI no. 11345
Based in Mayo.

Also cover Mayo from elsewhere (79)

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) · Allbrite Heatpump Specialists Ltd · Alternative Energy Ireland AEI · Alternative Heating & Cooling Ltd · AMS Plumbing & Heating Specialists Ltd · Anthony Brady Plumbing Limited · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Ballyhogan Plumbing Services Ltd · Bayside Heating Ltd · Blackstrand Retrofit Ltd. · Brusna Energy Solutions Ltd · Ciocan Construction Ltd · Clever Energy Solutions Ltd · Cloverhill Renewables Ltd · Cok Electrical & Renewables Ltd · Cowan Heating and Plumbing LTD · Craft Heating & Plumbing Services · Damian Grehan Plumbing & Heating · David Coleman Renewables Ltd. T/A DC Renewables · Ecoflex Energy Ltd · Ecoscene · Efficient Renewables Ltd · Energy Saving Technologies Ltd T/A Energlaze · Energywise Savings Ireland Ltd · Eoin Hanniffy Trades 365 Ltd · Ferm Eng Ltd · Finlay EcoFit Tullamore Ltd · Fitzpatrick Plumbing & Heating Contractors Ltd · FND Heating Ltd · Free-Flo Heating + Gas Services Ltd · Greentherm Ltd. · Horan Plumbing Ltd · J & D O'Brien Ltd · James Kane Energy Solutions LTD · James Lynch Plumbing & Heating Ltd · James O Connor Plumbing & Heating · Jason Fahy Heating · JJS Plumbing & Heating Limited · Joe Dunican Plumbing And Heating Ltd · Joe Hegarty Plumbing Ltd · Killco Renewables Ltd · Larkfield Plumbing Contractors Ltd · LVP Renewables Ltd · Marron Activ 8 Energies Ltd · Martin Fahy Heating & Plumbing Ltd · Mc Cormack Plumbing & Construction Ltd · Mc Elligott Heating & Plumbing Limited · NZEB Technologies Ltd · O Brien Bros Plumbing & Heating Ltd · Paul Folan Plumbing & Heating Contractor · PC Plumbing And Heating Ltd · R O'Donnell Plumbing Ltd · Royal Renewables Ltd · RTS Heating & Cooling Services LTD · Sean Gallagher Plumbing + Heating Ltd · Solaregy T/A Sola · Solaris Green Energy · TAF Plumbing Ltd · Terence Mc Donagh · Thermax Ltd · VKG Trading Ltd · White Premier Construction Ltd

What it costs, and what the grant pays

The grant for a semi-detached house is €1,200. 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 solar hot water 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.