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 Cavan?

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 Cavan 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 Cavan

199 companies on the SEAI register are based in or serve Cavan 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 Cavan

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

Breffni Insulation LtdOne Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Based in Cavan · and 24 other counties · SEAI no. 10013 · Website
Based in Cavan.
Greenwatt LtdOne Stop Shop
Attic insulationCavity wall insulationExternal wall insulationHeat pumpHeating controlsInternal wall insulationSolar hot waterWindow and door
Nationwide · SEAI no. 17045 · Website
Based in Cavan.
Abbey View Construction Lmited
Attic insulationInternal wall insulation
Based in Cavan · serves Leinster, Connacht and Ulster · SEAI no. 18039
Based in Cavan.
Airpacks T/A Kore Insulation
Attic insulationInternal wall insulation
Nationwide · SEAI no. 16252
Based in Cavan.
Anthony Brady Plumbing Limited
Attic insulationHeat pumpHeating controlsInternal wall insulationSolar hot water
Based in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 10257
Based in Cavan.
AO Electrical And Solar Ltd
Attic insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 18335
Based in Cavan.
Blackwell Consultancy T/A Blackwell Contracts
Attic insulationHeat pumpHeating controlsInternal wall insulation
Based in Cavan · serves Dublin, Leinster and Ulster · SEAI no. 16446
Based in Cavan.
Cando Engineering Ltd
Attic insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster and Ulster · SEAI no. 17837
Based in Cavan.
Carolan Murphy Ltd
Attic insulationInternal wall insulation
Based in Cavan · serves Leinster and Ulster · SEAI no. 18105
Based in Cavan.
Cloonagh Construction Ltd
Attic insulationInternal wall insulation
Based in Cavan · serves Ulster · SEAI no. 12926
Based in Cavan.
Decarb Contracts Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17881
Based in Cavan.
Edward Eccleston
Attic insulationHeating controlsInternal wall insulation
Nationwide · SEAI no. 13393
Based in Cavan.
Evertherm Ltd T/A Annalee Energy Ltd
Attic insulationCavity wall insulationInternal wall insulation
Nationwide · SEAI no. 15395
Based in Cavan.
Green - Lux Construction Ltd
Attic insulationExternal wall insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17819
Based in Cavan.
JJR Insulation Ltd
Attic insulationExternal wall insulationInternal wall insulationWindow and door
Based in Cavan · serves Dublin and Ulster · SEAI no. 17274
Based in Cavan.
JMC Wood Design Ltd
Attic insulationInternal wall insulation
Based in Cavan · also Dublin · SEAI no. 16703
Based in Cavan.
Kingscourt Insulation Ltd
Attic insulationCavity wall insulationInternal wall insulation
Nationwide · SEAI no. 17253
Based in Cavan.
McMorrow Renewables Limited
Attic insulationExternal wall insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 17501
Based in Cavan.
P Mcgovern & Son Construction Ltd
Attic insulationInternal wall insulation
Based in Cavan · serves Leinster, Connacht and Ulster · SEAI no. 18286
Based in Cavan.
Padraig Brady Carpentry Limited
Attic insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster, Connacht and Ulster · SEAI no. 19450
Based in Cavan.
Peter McKiernan Construction & Engineering
Attic insulationInternal wall insulation
Based in Cavan · serves Connacht and Ulster · SEAI no. 15869
Based in Cavan.
Rodney Brady Contracting Ltd
Attic insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster and Ulster · SEAI no. 12481
Based in Cavan.
Seamus O'Reilly
Attic insulationExternal wall insulationInternal wall insulation
Based in Cavan · serves Dublin, Leinster and Ulster · SEAI no. 17130
Based in Cavan.

Also cover Cavan from elsewhere (176)

These told SEAI they cover the province Cavan 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.

Activ8 Energies (OSS) · Ashgrove Engineering Ltd T/A Ashgrove Renewables (OSS) · Bayview Contracts Ltd (OSS) · Bord Gais Energy Ltd (OSS) · Churchfield Home Services (OSS) · Cooper Insulation Ltd. (OSS) · Electric Ireland Superhomes (OSS) · Energyfix (OSS) · Envirobead Ltd. (OSS) · Home Comfort Retrofits 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 · Abhaile Carpentry And Construction Ltd · AC Insulation · AGI Construction Ltd · All In Insulation · Allied Irish Property Ltd · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Anthony Quinn Construction Ltd · Antone Briody Construction Ltd · Ap Eco Building & Renovation · Apex Engineering · Auro Naes Ltd T/A Roesavin Construction · Aurora Construction Ltd · B. Donaghey & Sons · Barry Kiernan Construction Ltd · BCBAL Ltd T/A McGee Insulation · Bluebuild Renewables Ltd · Braecon Construction Ltd · Breen Heating and Plumbing Ltd · Brendan Mcgrenaghan Construction · Brendan Sammon Aughnasheelin Ltd · Breslin Construction And Renovation Ltd · C.D.M. Contracts Ltd · Carl Byrne · Carrickmaquigley Construction Ltd · Cellulose Insulation Ltd · Ciocan Construction Ltd · Clar ICH Ltd · Clioma House Ltd · Clonmany Builders Limited · CMH Carpentry And Construction · Cs Drylining Ltd · Cunningham Mechanical Services Ltd · CW Xterior Solutions Ltd · D Monagle Drywall Ltd · Daask Build Ltd · Dabrena Properties Ltd · Damien Babington & Sons Ltd · DC Energy Solutions · Derchil Limited t/a CosiHomes · Derryveagh Contracts Ltd · DMT Renewables Ltd · Donegal Drylinning Ltd · Ds Fallon · Duey Brothers Ltd · Eamonn Finn · Eco Home Insulation · Eco Pro Insulation · Eco Smart External Insulation Ltd · Eco Thermal Homes · Ecowise Insulation Ltd · Eiremaintenance.Ie · Eitas · Elem Construction Ltd T/A Inish Contracts · Enda Sean Construction Ltd · Ferm Eng Ltd · Floelen Construction Ltd · Forma Design & Build Ltd · FS Plumbing & Heating Ltd · Galbraith Construction Ltd · Gavin McGonagle Windows · Gavin Tinney Limited · George Gill & Sons Construction Ltd · Gmg Contracts Ltd · Gray Construction & Design Ltd · Green Air Technologies Ltd · Hamkel Holdings Ltd / Soltherm · Home Building Solutions T/A HBS Elegant build Ltd · Ian Clarke · Inish Mica Repairs Ltd · Inish Stone · Innovate Insulation Ltd · Insulate Ireland · J Shaw Carpentry Ltd · J.Russell Construction Ltd · Jacob Insulation Limited · James Keenan Eco Limited T/A Keenan Eco · JMD Contracts Ltd · John Doherty Construction Ltd · John Grant Construction Ltd · John O'Loughlin & Son Ltd · Johnathan Timoney T/A Rendpro Ltd · K K Home & Building Services Ltd · Kelly Construction · Kelly Insulation Heating & Plumbing · Kilsarn Warmer Homes · Laghey Construction Ltd · Laurence Doherty Building Services Ltd · Laurence Mc Colgan Construction Ltd · Leitrim Warmer Homes CLG · M&W Fire Solutions Ltd · Madden Developments Ltd · Marcalla Limited · Marcoy Ltd · Markaye Contracts Ltd · Masterway Enterprises Ltd · May-Ard Developments Ltd · Mc Menamin Building Contractors Ltd · Mc Namee Fabrication & Building Systems Ltd T/A Mc · McArdle Building Contractors Ltd · McCaher Construction Ltd. · McCallion Construction · Mclaughlin Taylor Drylining Roi Ltd · MDCC Ltd · Meegan Insulations · Melmc Construction Ltd · Michael Kelly Glebe Builders Ltd · Michael Mc Colgan · Midland Warmer Homes Company Limited · MS Plastering Contractor · Multi Corp Construction Services Ltd · Multistructure Construction Ltd · Niatara Construction Ta Apollo Insulation · Noel Kilpatrick Contruction Ltd · North West Retrofit · O'Loughlin Construction · Ora Timber Frame · Oriel Insulations · P & A Drylining Ltd · P Shannon Building & Civil Engineering Ltd · P.T.M Carpentry & Building Ltd · Paddy Mc Hugh Building Ltd · Paddy Monagle Construction · Parker Construction Ltd · Paul Breslin Construction Ltd · Paul Doherty Construction Ltd · Philip Loughran Construction Ltd · Poly Coating and Sealing Ltd · Premier Insulations · Premier Solutions NW Ltd · Pro Walls Ltd · Reidy KDE construction Ltd · Rend Master Ltd · Renova · Retrofit Energy Ireland One Stop Shop Ltd · Revilo Properties Ltd. · Rio Ents Ltd ta A-Rate · Rmn Developments Ltd · Romac Acoustics Ltd · S&S Rankin Ltd · SBN Solid Home Ltd · Seamus Friel & Sons Ltd · Seamus Sweeney Drylining Ltd · SLP Westport · Solaregy T/A Sola · Solaris Green Energy · Solid Insulation Systems Ireland Ltd · Sovereign Finishes Limited · Ss Drylining & Plastering Ltd · Superior Insulations Ltd · Sustainable Warmth Ltd · T Insulations · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · TLI Group Ltd T/A Transmission Links Ireland Ltd · Tomasz Rulak T/A Tombet Building · Tuatha Construction · 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 Cavan 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 Cavan

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 Cavan?: 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 Cavan 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 Cavan

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.