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 Kilkenny?

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 Kilkenny 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.

Cavity wall insulation installers in Kilkenny

92 companies on the SEAI register are based in or serve Kilkenny for cavity 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 Kilkenny

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

John Taylor Construction Ltd
Attic insulationCavity wall insulationHeat pumpInternal wall insulationWindow and door
Based in Kilkenny · serves Leinster and Munster · SEAI no. 18246
Based in Kilkenny.

Also cover Kilkenny from elsewhere (91)

These told SEAI they cover the province Kilkenny 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) · Aspen Eco Power (OSS) · 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) · Cooper Insulation Ltd. (OSS) · Electric Ireland Superhomes (OSS) · Energlaze Home Energy Upgrades (OSS) · Energyfix (OSS) · Envirobead Ltd. (OSS) · Greenwatt Ltd (OSS) · Home Comfort Retrofits Ltd (OSS) · House 2 Home Retrofit Ltd (OSS) · Integrate Home Energy Upgrades Limited (OSS) · Kingdom Installation Ltd (OSS) · Kingspan Insulation Ltd (OSS) · Kore Retrofit Ltd (OSS) · Leetherm Project Management Ltd (OSS) · Lough Projects (OSS) · Moston Construction Ltd (OSS) · OHK Energy LTD (OSS) · Retrofit Design Ltd (OSS) · Retrofit Energy Ireland (OSS) · SSE Airtricity Energy Services Ltd (OSS) · WiEnergy (OSS) · AB Teague Enterprises Ltd · Absolute Insulation Ltd · All In Insulation · Alpha Insulation Ltd T/A Western Insulation · Anthony Coughlan Heating & Plumbing TA C&S Construction Services · Ardvark Insulation Ltd · C & W Insulations · Carlow Insulation Solutions · CK Energy Management Solutions (EMS) Ltd t/a ENCON · Clane Building Works · Clar ICH Ltd · Complete Insulations and Energy Upgrades Ltd · Damien Ryan Contracts Ltd · Derchil Limited t/a CosiHomes · Eamonn Finn · Eco Home Insulation · Ecospec Limited · Ecotec Insulation Ltd · Ecotech Contracts IRI Ltd · Ecowise Insulation Ltd · Eirgreen · Evertherm Ltd T/A Annalee Energy Ltd · F C Insulation · Fagan Crossmolina Limited · Finlay EcoFit Tullamore Ltd · Five Counties Home Insulation Limited · G. Reilly Construction Ltd · Gallen Insulation Ltd · Gar Insulation Ltd · Harrington Insulations Limited · Home Works Insulation · Hometherm Insulation Ltd · Innovate Insulation Ltd · Instant Eco Homes Ltd · Jacob Insulation Limited · Keating Insulation Ltd · Kelly Insulation Heating & Plumbing · Kingscourt Insulation Ltd · Leetherm Insulation Ltd. · Leitrim Warmer Homes CLG · McCormack Insulation · Meegan Insulations · Metro Insulation Ltd · Midland Warmer Homes Company Limited · Model County Insulation · Moran Retrofit Solutions · National Retrofit & Construction Services Ltd · NE Energy Efficient Homes Ltd · O Leary Insulation · OG Insulation Limited · Powell Insulations Ltd · Premier Insulations · QDL Insulation · Rob Lacey Insulations Ltd · Ryan Spray Foam · South East Insulations · Spreadwell Construction Ltd · Stone Arches LTD T/A Waterford Insulation · Superior Insulations Ltd · Sustainable Warmth Ltd · Thermowise Insulations Limited · Tirconaill Contracts Ltd T/A Mc Taggart Insulation · Warm 'n Cosy Homes Limited

What it costs, and what the grant pays

The grant for a semi-detached house is €1,300. SEAI recorded a middle price of €1,550 for this work last year, which leaves about €250 for you to pay. These are national figures, not Kilkenny 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 cavity wall insulation quotes in Kilkenny

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 Kilkenny?: 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 Kilkenny 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 Kilkenny

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.