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 Donegal?

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 Donegal 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 Donegal

195 companies on the SEAI register are based in or serve Donegal 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 Donegal

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

Abhaile Carpentry And Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 20158
Based in Donegal.
AC Insulation
Attic insulationCavity wall insulationInternal wall insulation
Based in Donegal · serves Connacht and Ulster · SEAI no. 17750
Based in Donegal.
Anthony Quinn Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Connacht and Ulster · SEAI no. 17493
Based in Donegal.
B. Donaghey & Sons
Attic insulationExternal wall insulationInternal wall insulationWindow and door
Based in Donegal · serves Ulster · SEAI no. 10300
Based in Donegal.
BCBAL Ltd T/A McGee Insulation
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 11361
Based in Donegal.
Braecon Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19784
Based in Donegal.
Brendan Mcgrenaghan Construction
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18276
Based in Donegal.
Breslin Construction And Renovation Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18334
Based in Donegal.
Carl Byrne
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19964
Based in Donegal.
Carrickmaquigley Construction Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Donegal · serves Leinster and Ulster · SEAI no. 17721
Based in Donegal.
Clonmany Builders Limited
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17935
Based in Donegal.
CMH Carpentry And Construction
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 20119
Based in Donegal.
Cs Drylining Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19427
Based in Donegal.
D Monagle Drywall Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17742
Based in Donegal.
Daask Build Ltd
Attic insulationHeating controlsInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18314
Based in Donegal.
Derryveagh Contracts Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18109
Based in Donegal.
DMT Renewables Ltd
Attic insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulation
Based in Donegal · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17260
Based in Donegal.
Donegal Drylinning Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19340
Based in Donegal.
Duey Brothers Ltd
Attic insulationExternal wall insulationInternal wall insulation
Nationwide · SEAI no. 10827
Based in Donegal.
Eiremaintenance.Ie
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19940
Based in Donegal.
Elem Construction Ltd T/A Inish Contracts
Attic insulationInternal wall insulation
Nationwide · SEAI no. 18117
Based in Donegal.
Enda Sean Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19425
Based in Donegal.
Ferm Eng Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterSolar panel
Based in Donegal · and 8 other counties · SEAI no. 10112
Based in Donegal.
FS Plumbing & Heating Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Donegal · serves Dublin and Ulster · SEAI no. 10505
Based in Donegal.
Galbraith Construction Ltd
Attic insulationInternal wall insulationWindow and door
Based in Donegal · serves Ulster · SEAI no. 13643
Based in Donegal.
Gavin McGonagle Windows
Internal wall insulationWindow and door
Based in Donegal · serves Ulster · SEAI no. 19980
Based in Donegal.
Gavin Tinney Limited
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 16675
Based in Donegal.
George Gill & Sons Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 13325
Based in Donegal.
Inish Mica Repairs Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18333
Based in Donegal.
Inish Stone
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18311
Based in Donegal.
Insulate Ireland
Attic insulationExternal wall insulationInternal wall insulation
Based in Donegal · serves Leinster, Munster, Connacht and Ulster · SEAI no. 17863
Based in Donegal.
J.Russell Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 20030
Based in Donegal.
James Keenan Eco Limited T/A Keenan Eco
Attic insulationInternal wall insulation
Based in Donegal · serves Connacht and Ulster · SEAI no. 19400
Based in Donegal.
JMD Contracts Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18285
Based in Donegal.
John Doherty Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17928
Based in Donegal.
John Grant Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18045
Based in Donegal.
John O'Loughlin & Son Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Leinster, Munster, Connacht and Ulster · SEAI no. 10561
Based in Donegal.
Johnathan Timoney T/A Rendpro Ltd
External wall insulationInternal wall insulation
Based in Donegal · serves Dublin, Connacht and Ulster · SEAI no. 18275
Based in Donegal.
Kelly Construction
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19956
Based in Donegal.
Laghey Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17959
Based in Donegal.
Laurence Doherty Building Services Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17704
Based in Donegal.
Laurence Mc Colgan Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 15682
Based in Donegal.
M&W Fire Solutions Ltd
Attic insulationInternal wall insulation
Nationwide · SEAI no. 20083
Based in Donegal.
Marcalla Limited
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19383
Based in Donegal.
Marcoy Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 11460
Based in Donegal.
Masterway Enterprises Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19444
Based in Donegal.
Mc Menamin Building Contractors Ltd
Attic insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationWindow and door
Based in Donegal · serves Dublin and Ulster · SEAI no. 16109
Based in Donegal.
Mc Namee Fabrication & Building Systems Ltd T/A Mc
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18013
Based in Donegal.
McCallion Construction
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 11488
Based in Donegal.
Mclaughlin Taylor Drylining Roi Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Dublin and Ulster · SEAI no. 18087
Based in Donegal.
MDCC Ltd
Internal wall insulation
Based in Donegal · serves Ulster · SEAI no. 20118
Based in Donegal.
Melmc Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17061
Based in Donegal.
Michael Kelly Glebe Builders Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Connacht and Ulster · SEAI no. 18233
Based in Donegal.
Michael Mc Colgan
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19946
Based in Donegal.
Multistructure Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18290
Based in Donegal.
North West Retrofit
Attic insulationInternal wall insulation
Based in Donegal · serves Connacht and Ulster · SEAI no. 17554
Based in Donegal.
Ora Timber Frame
Attic insulationInternal wall insulation
Based in Donegal · serves Leinster, Munster, Connacht and Ulster · SEAI no. 18250
Based in Donegal.
P & A Drylining Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 13193
Based in Donegal.
Paddy Mc Hugh Building Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Dublin and Ulster · SEAI no. 14148
Based in Donegal.
Paddy Monagle Construction
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17385
Based in Donegal.
Paul Breslin Construction Ltd
Internal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17891
Based in Donegal.
Paul Doherty Construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18073
Based in Donegal.
Premier Solutions NW Ltd
Attic insulationCavity wall insulationInternal wall insulationWindow and door
Based in Donegal · serves Ulster · SEAI no. 16379
Based in Donegal.
Reidy KDE construction Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 18269
Based in Donegal.
Rmn Developments Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Donegal · serves Connacht and Ulster · SEAI no. 17781
Based in Donegal.
S&S Rankin Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17989
Based in Donegal.
Seamus Friel & Sons Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 10429
Based in Donegal.
Seamus Sweeney Drylining Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 19345
Based in Donegal.
Ss Drylining & Plastering Ltd
Attic insulationInternal wall insulation
Based in Donegal · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 18183
Based in Donegal.
Tirconaill Contracts Ltd T/A Mc Taggart Insulation
Attic insulationCavity wall insulationExternal wall insulationHeat pumpInternal wall insulationWindow and door
Nationwide · SEAI no. 15552
Based in Donegal.
Tuatha Construction
Attic insulationExternal wall insulationInternal wall insulation
Based in Donegal · serves Ulster · SEAI no. 17157
Based in Donegal.

Also cover Donegal from elsewhere (124)

These told SEAI they cover the province Donegal 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) · AB Teague Enterprises Ltd · Abbey View Construction Lmited · AGI Construction Ltd · Airpacks T/A Kore Insulation · All In Insulation · Allied Irish Property Ltd · Anthony Brady Plumbing Limited · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Antone Briody Construction Ltd · AO Electrical And Solar Ltd · Ap Eco Building & Renovation · Apex Engineering · Auro Naes Ltd T/A Roesavin Construction · Aurora Construction Ltd · Barry Kiernan Construction Ltd · Blackwell Consultancy T/A Blackwell Contracts · Bluebuild Renewables Ltd · Breen Heating and Plumbing Ltd · Brendan Sammon Aughnasheelin Ltd · C.D.M. Contracts Ltd · Cando Engineering Ltd · Carolan Murphy Ltd · Cellulose Insulation Ltd · Ciocan Construction Ltd · Clar ICH Ltd · Clioma House Ltd · Cloonagh Construction Ltd · Cunningham Mechanical Services Ltd · CW Xterior Solutions Ltd · Dabrena Properties Ltd · Damien Babington & Sons Ltd · DC Energy Solutions · Decarb Contracts Ltd · Derchil Limited t/a CosiHomes · Ds Fallon · Eamonn Finn · Eco Home Insulation · Eco Pro Insulation · Eco Smart External Insulation Ltd · Eco Thermal Homes · Ecowise Insulation Ltd · Edward Eccleston · Eitas · Evertherm Ltd T/A Annalee Energy Ltd · Floelen Construction Ltd · Forma Design & Build Ltd · Gmg Contracts Ltd · Gray Construction & Design Ltd · Green - Lux Construction Ltd · Green Air Technologies Ltd · Hamkel Holdings Ltd / Soltherm · Home Building Solutions T/A HBS Elegant build Ltd · Ian Clarke · Innovate Insulation Ltd · J Shaw Carpentry Ltd · Jacob Insulation Limited · JJR Insulation Ltd · K K Home & Building Services Ltd · Kelly Insulation Heating & Plumbing · Kilsarn Warmer Homes · Kingscourt Insulation Ltd · Leitrim Warmer Homes CLG · Madden Developments Ltd · Markaye Contracts Ltd · May-Ard Developments Ltd · McArdle Building Contractors Ltd · McCaher Construction Ltd. · McMorrow Renewables Limited · Meegan Insulations · Midland Warmer Homes Company Limited · MS Plastering Contractor · Multi Corp Construction Services Ltd · Niatara Construction Ta Apollo Insulation · Noel Kilpatrick Contruction Ltd · O'Loughlin Construction · Oriel Insulations · P Mcgovern & Son Construction Ltd · P Shannon Building & Civil Engineering Ltd · P.T.M Carpentry & Building Ltd · Padraig Brady Carpentry Limited · Parker Construction Ltd · Peter McKiernan Construction & Engineering · Philip Loughran Construction Ltd · Poly Coating and Sealing Ltd · Premier Insulations · Pro Walls Ltd · Rend Master Ltd · Renova · Retrofit Energy Ireland One Stop Shop Ltd · Revilo Properties Ltd. · Rio Ents Ltd ta A-Rate · Rodney Brady Contracting Ltd · Romac Acoustics Ltd · SBN Solid Home Ltd · Seamus O'Reilly · SLP Westport · Solaregy T/A Sola · Solaris Green Energy · Solid Insulation Systems Ireland Ltd · Sovereign Finishes Limited · Superior Insulations Ltd · Sustainable Warmth Ltd · T Insulations · TLI Group Ltd T/A Transmission Links Ireland Ltd · Tomasz Rulak T/A Tombet Building · 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 Donegal 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 Donegal

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 Donegal?: 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 Donegal 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 Donegal

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.