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 Cork?

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 Cork 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 Cork

330 companies on the SEAI register are based in or serve Cork 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 Cork

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

Ashgrove Engineering Ltd T/A Ashgrove RenewablesOne Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterSolar panelWindow and door
Nationwide · SEAI no. 12010 · Website
Based in Cork.
Envirobead Ltd.One Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Nationwide · SEAI no. 10218 · Website
Based in Cork.
Kilgobbin Castle Holdings Ltd t/a InsulexOne Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Based in Cork · serves Dublin and Munster · SEAI no. 10496 · Website
Based in Cork.
Munster External Wall Insulation T/A SE SystemsOne Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterSolar panelWindow and door
Based in Cork · serves Dublin and Munster · SEAI no. 14825 · Website
Based in Cork.
Ability Contracting Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17915
Based in Cork.
Aidan Mccarthy Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 18067
Based in Cork.
Anthony Coughlan Heating & Plumbing TA C&S Construction Services
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Nationwide · SEAI no. 10791
Based in Cork.
Apex Engineering
Attic insulationHeating controlsInternal wall insulationWindow and door
Nationwide · SEAI no. 20106
Based in Cork.
B & T External Insulation & Plastering Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16148
Based in Cork.
C&Y Renovations Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 20015
Based in Cork.
CA Energy Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Cork · serves Munster · SEAI no. 11842
Based in Cork.
Cadogan Construction
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 19449
Based in Cork.
Carrigbel Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16372
Based in Cork.
Cellulose Insulation Ltd
Attic insulationInternal wall insulation
Nationwide · SEAI no. 14456
Based in Cork.
Coolim Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16182
Based in Cork.
Coolyduff Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17022
Based in Cork.
D Dwyer Builders Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16751
Based in Cork.
David Doyle Construction Limited
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17845
Based in Cork.
David O'Flynn Construction T/A Petram Construction
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16659
Based in Cork.
Deep Retrofit Ltd
Attic insulationInternal wall insulationWindow and door
Based in Cork · serves Munster · SEAI no. 18094
Based in Cork.
Derek Curtin Ltd.
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 12612
Based in Cork.
DKS Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16367
Based in Cork.
Dncf
Attic insulationInternal wall insulation
Based in Cork · serves Dublin, Leinster, Munster and Connacht · SEAI no. 19379
Based in Cork.
Donal A O'Brien Building Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Leinster and Munster · SEAI no. 17805
Based in Cork.
Doyle Construction Cork
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 20006
Based in Cork.
Dunmanus Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16942
Based in Cork.
Ecowrap
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Dublin, Leinster, Munster and Connacht · SEAI no. 18056
Based in Cork.
Energywise Savings Ireland Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterSolar panel
Based in Cork · serves Leinster, Munster and Connacht · SEAI no. 16656 · Website
Based in Cork.
Garry McCarthy Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 14280
Based in Cork.
Goleen Developments Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 13662
Based in Cork.
Grainger Energy Solutions Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Dublin, Leinster, Munster and Connacht · SEAI no. 12703
Based in Cork.
Grouville Developments Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 12466
Based in Cork.
Heffernan Brothers Contractors HBC Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17092
Based in Cork.
IRD Duhallow
Attic insulationCavity wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16261
Based in Cork.
J.D. Buckley Construction Ltd
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulationWindow and door
Based in Cork · serves Munster · SEAI no. 10095
Based in Cork.
JBS Construction Ltd
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Cork · serves Munster · SEAI no. 12468
Based in Cork.
Jm Energy Savings Limited
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 19380
Based in Cork.
L P M Contracting Ltd
External wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17955
Based in Cork.
M Fox & WM O'Rourke Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 10650
Based in Cork.
MJ O'Doherty Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16775
Based in Cork.
Momentum Construction LTD
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16543
Based in Cork.
MS Plastering Contractor
Attic insulationExternal wall insulationInternal wall insulation
Nationwide · SEAI no. 17116
Based in Cork.
NCE Insulation T/A Secure and Fix It Enterprises
Attic insulationInternal wall insulation
Based in Cork · serves Dublin, Leinster and Munster · SEAI no. 10535
Based in Cork.
Noel Hennessy Construction Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17972
Based in Cork.
Ocon Plastering Ltd
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 12260
Based in Cork.
OS Insulate Ltd
Attic insulationCavity wall insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 15563
Based in Cork.
P&T Complete Renovations Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 16867
Based in Cork.
Parker Construction Ltd
Attic insulationInternal wall insulation
Nationwide · SEAI no. 16397
Based in Cork.
Pat Dineen T/A Hamilton French
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 18138
Based in Cork.
Pat Enright Glass And Glazing Ltd
Internal wall insulationWindow and door
Based in Cork · serves Munster · SEAI no. 19801
Based in Cork.
Pat F Murphy
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Cork · serves Munster · SEAI no. 11547
Based in Cork.
Reidy Plastering and Insulation Contractors
Internal wall insulation
Based in Cork · serves Munster · SEAI no. 15620
Based in Cork.
Riverbank JC Holdings Ltd
Internal wall insulation
Based in Cork · serves Munster · SEAI no. 19438
Based in Cork.
Scott Shellard Construction Limited
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17862
Based in Cork.
Sean Lilley Construction Limited
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 20065
Based in Cork.
Sigma Homes Ltd
Attic insulationInternal wall insulationWindow and door
Based in Cork · serves Munster · SEAI no. 16181
Based in Cork.
Sloane Plastering LTD
External wall insulationInternal wall insulation
Based in Cork · serves Dublin, Leinster and Munster · SEAI no. 12921
Based in Cork.
Stephen Mc Grath
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 15585
Based in Cork.
T & A Plant Hire
Attic insulationHeating controlsInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17245
Based in Cork.
Titan Homes Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 13804
Based in Cork.
Tony McKeon Carpentry & Building Services
Attic insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17218
Based in Cork.
Vinro Ltd
Internal wall insulation
Based in Cork · serves Munster · SEAI no. 14488
Based in Cork.
Wall 2 Wall Construction
Attic insulationExternal wall insulationInternal wall insulation
Based in Cork · serves Munster · SEAI no. 17042
Based in Cork.

Also cover Cork from elsewhere (267)

These told SEAI they cover the province Cork 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.

Bayview Contracts Ltd (OSS) · Bord Gais Energy Ltd (OSS) · Breffni Insulation Ltd (OSS) · CBM Munster Construction T/A Home Energy Retrofits (OSS) · Churchfield Home Services (OSS) · Electric Ireland Superhomes (OSS) · Energlaze Home Energy Upgrades (OSS) · Energywise Ireland (OSS) · Greenwatt Ltd (OSS) · House 2 Home Retrofit Ltd (OSS) · Kingdom Installation Ltd (OSS) · Kingspan Insulation Ltd (OSS) · Kore Retrofit Ltd (OSS) · Leetherm Project Management 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 · Absolute Acrylics Ltd · Aerofill Insulation · AGI Construction Ltd · Airpacks T/A Kore Insulation · AL Plastering & Building Contractor · Alan Murphy Construction Ltd T/A AM Construction · Alc Construction Limited · All In Insulation · All Weather Insulation · Allied Irish Property Ltd · Alpha Insulation Ltd T/A Western Insulation · Annex Building Renovation Ltd · Anthony Morahan Plumbing & Heating Ltd · Ap Eco Building & Renovation · Auro Naes Ltd T/A Roesavin Construction · Ballinamintra Building Services Ltd · Ballinderry Developments Ltd T/A Rebuild · Ballyhogan Plumbing Services Ltd · Bd Partitions + Ceilings Ltd · Behan Builders Shanagolden Ltd. · BK Modern Build Ltd · BR Insulation t/u Robert O'Brien & Son Ltd · Brendan Maher & Sons Construction Ltd · Brendan Moloney Carpentry · Brendan Shanahan · Brian Foley Construction Ltd · Brian Healy Carpentry Ltd T/A Healy Construction · Brian Smith Heating & Plumbing Ltd · Bromur Energy Ltd · Brosnan Plastering & Insulation Systems Ltd · Budget Renovations · Byrne & Byrne Construction · C & B Cormican Building Contractors Ltd · C & E Fitzgerald Builders · C&H Building Contractors Limited · Caherass Plastering Ltd · Carew Construction Ltd · Carlow Insulation Solutions · Century Retrofit Ltd · Christopher Doona Heating & Plumbing Contractor · Ciocan Construction Ltd · CK Energy Management Solutions (EMS) Ltd t/a ENCON · Clar ICH Ltd · Clare Insulation · Clifford Roofing And Contracting Ltd · Clioma House Ltd · Colm And Michael Dunne · Con Horgan & Sons Ltd T/A Horgan Renewables · Conneally Painting & Sons Trading As Conneally Group · Connole Construction Ltd · Connolly Building & Renovations Ltd · Conor Phelan Construction Ltd · Corrib View Construction Ltd · Cosyfill Insulation · Culmc Constructiuon LTD TA JMC Construction · CW Xterior Solutions Ltd · D&E External Insulation Ltd · Dalmoy Limited · Dalvac Systems Limited · Damien Ryan Contracts Ltd · Dave Fitzgerald Contracts Ltd · David Flaherty Construction LTD · David O'Sullivan · Db Carpentry · DC Energy Solutions · De Courcy'S Bridge Ltd · Declan Buggy LTD · Declan Fahy Plastering LTD · Derchil Limited t/a CosiHomes · DJH INSULATION LTD · Dublin All Trades Building Services · Duey Brothers Ltd · Dunne Drylining Ltd · Dunurtaigh Construction Ltd · Eco Home Insulation · Eco Pro Insulation · Eco Smart External Insulation Ltd · Eco Thermal Homes · Ecosy Better Homes Ltd · Ecowise Insulation Ltd · Edward Eccleston · Eirgreen · Eitas · EJP Concrete Structures Ltd · Elem Construction Ltd T/A Inish Contracts · Elitetherm · Energy Retrofit Ireland · Eugene Brouder · Evertherm Ltd T/A Annalee Energy Ltd · Finbarr McMahon Carpentry/Construction · Finlay EcoFit Tullamore Ltd · Finloc Renovations Ltd T/A Finloc Construction · Fitzpatrick Plumbing & Heating Contractors Ltd · Floelen Construction Ltd · Forma Design & Build Ltd · Foster Construction · G & S Construction & Plant Hire Limited · G.V.Services Limited · GjMurray ConstructionT/AFrank Murray Construction · Glen Construction Design Ltd · Goode Energy · Grangebarry Construction Ltd · Green Air Technologies Ltd · Hamkel Holdings Ltd / Soltherm · Harrington Hbrs Ltd · Harrington Insulations Limited · Harry Twomey Plastering · Hennessy Carpentry Services · Henry Connolly Builder Ltd. · Home Building Solutions T/A HBS Elegant build Ltd · Home Works Insulation · Hughes and Co External Insulation · Inglotherm Ltd · Innovate Insulation Ltd · Insulate Ireland · J Shaw Carpentry Ltd · J&C McMahon · J&J Plastering · Jacob Insulation Limited · Jason Connellan Construction Ltd · Jf Fordham Construction Ltd · JJ Carr Construction Ltd · Joe Dunican Plumbing And Heating Ltd · John O'Loughlin & Son Ltd · John Ryan Construction Ltd. · John Ryan Premier Construction Ltd · John Somers Construction Ltd · John Taylor Construction Ltd · Jon O 'Neill Construction Limited · K K Home & Building Services Ltd · K&D Developments (Sligo) Ltd. · Kanto Property Services · Kelly Insulation Heating & Plumbing · Kereen Building Services · Kesel Construction Ltd · Kg Future Homes Limited · Kh Energy Services Limited · Kieran Walsh Building & Plastering Ltd · Kilmallock Developments Ltd · Kilrehill Bros · Kingscourt Insulation Ltd · Kirrane Engineering Limited · Labcon Building And Civil Engineering Limited · LDS INTERIORS LTD · Leetherm Insulation Ltd. · Leitrim Warmer Homes CLG · LF Building Services T/A Fennery construction ltd · Liam Hokey · M & K Interiors Ltd · M-G Construction Services · M&W Fire Solutions Ltd · Madden Developments Ltd · Magical Reconstruction Ltd · MAK Building Services Ltd · Maplewood Property Services · Markaye Contracts Ltd · Matthew Rice T/A Mattie Rice Carpentry · McCaher Construction Ltd. · McInerney and Keane Insulation · Measure 2 Build Ltd · Metro Utilities Ltd T/A Metro Developments · Michael Considine · Michael Murphy Construction · Michael Ormond Ltd · Midland Warmer Homes Company Limited · Mike Sugrue Building Contractors · Mjkhomes Galway Ltd · Monanore Construction Ltd · Muggivan Brothers Construction Ltd · Multi Corp Construction Services Ltd · Mulway Construction Limited · Nc Carpentry & Construction Ltd · Ned Grant and Sons · Neil Hogan Building Contractor · Nexgen Developments LTD · Nexus Building & Civil Engineering Ltd · Niatara Construction Ta Apollo Insulation · Noel Leahy Carpentry & Building Services Limited · O Leary Insulation · O Mahony Renewable Solutions Ltd · O'Loughlin Construction · Odl Homes Ltd · Ora Timber Frame · Oriel Insulations · Paddy Kilduff and Sons Builders Ltd TA Kilduff Con · Pat Loftus Construction Ltd · Patrick Sheehan Construction · Paudie Sheehy · Peter Brereton Plastering · Phelan Construction · Philly Burke Carpentry, Painting & Building · Poly Coating and Sealing Ltd · Pouldoon Construction Ltd · PPGIH Business Ltd t/a Premier Irish Homes · Premier Insulations · Primabuild Ltd · Pro Walls Ltd · Probuild Building Services Ltd · Quilter Insulation · Raphael Considine Construction · Redfern Construction Ltd · Reflat Insulation Ltd · Rend Master Ltd · Renova · Renual Construction Limited · Retrofit Energy Ireland One Stop Shop Ltd · Richard Harte Building & Plastering Services Ltd · Richard Mc Mahon & Warmer Homes · Rio Ents Ltd ta A-Rate · RMC Ecobuild Ltd · RS Construction · Ryan Spray Foam · SBN Solid Home Ltd · SCMS Mechanical Services Ltd · Seamus Ryan Roofing Ltd · Sean Fitzgerald Ceilings & Partitions Ltd · SLP Westport · SMB Construction · 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 · Stephen Doherty · Stephen Murphy Plumbing & Heating Ltd · Stone Arches LTD T/A Waterford Insulation · Superior Insulations Ltd · Sustainable Warmth Ltd · T Insulations · Tallis And Co Ltd · Tamburah Limited · The Best Insulation · Thermo Renewables Limited · Thomas O Connor · Tim O'Leary Spray Foam Ltd · Timahoe Construction T/A Leinster Property Service · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · TLI Group Ltd T/A Transmission Links Ireland Ltd · TMC Construction · Tomasz Rulak T/A Tombet Building · Tommy Allen · Treacon Carpentry & Building Services Ltd · Trevor Kelliher Constuction · Verde Remediation Services Ltd · Vincent Bergin & Sons Limited · Weglarz Construction

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 Cork 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 Cork

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 Cork?: 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 Cork 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 Cork

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.