Cavity Wall Insulation Contractors in Dublin, from Dublin to Tallaght and Surrounding Areas
6 SEAI-registered cavity wall insulation contractors based in Dublin. Contact them directly, with no middleman and no fee.
Cavity Wall Insulation in Dublin
Walls are typically the largest single source of heat loss in an uninsulated Irish home, and much of it escapes through the walls. For homes with an unfilled cavity, filling it is the quickest wall upgrade available with no external works and a grant that often covers the full cost.
What the housing stock here is made of. Solid brick in the pre-war terraces and inner suburbs, solid block through the 1950s and 1960s, cavity standard from the 1980s.
Contractors listed on this page work across Dublin, including Dublin, Swords, Lucan, Balbriggan, Blanchardstown, Tallaght, Dun Laoghaire and Rathmines. Most travel well beyond their registered address, so a contractor based a county over is worth ringing rather than ruling out.
This page lists only the cavity wall insulation contractors in Dublin. To see every insulation contractor in Dublin regardless of measure, use the county directory.
SEAI-Registered Cavity Wall Insulation Contractors Based in Dublin
Listed where the company is registered. Search by company name, or by a county to see who covers it.
Nothing matches that. Try a county name, or clear the search.
What Cavity Wall Insulation Costs in Dublin
These are indicative market ranges to help you judge whether a quote is in the right area, not a price. What a job actually costs turns on the size and condition of the property, the state of the existing render or walls, access and scaffolding, the finish chosen and how exposed the site is. Get at least two quotes from SEAI-registered contractors.
Before the Grant
€1,200 to €2,000
Indicative for a three-bed semi. For a three-bed semi-detached home. An apartment or mid-terrace runs €500 to €900, a four-bed detached €1,200 to €2,000, and a large detached or bungalow €1,600 to €2,800.
SEAI Grant
€1,800
Up to €1,800 for a detached house, €1,200 semi-detached, €800 mid-terrace and €700 apartment, as of July 2026. Applied as a direct deduction from your contractor invoice.
What You Actually Pay
€0 to €200
For most homes the grant covers the job in full or close to it. Larger detached properties can be left with more. Get at least two quotes from SEAI-registered contractors.
Other Insulation Work Covered in Dublin
The same register covers every measure. These are the other types with contractors based in Dublin.
Cavity Wall Insulation in Dublin: Common Questions
How Many Cavity Wall Insulation Contractors Are There in Dublin?
There are six SEAI-registered cavity wall insulation contractors based in Dublin. Every one is drawn from the official SEAI register, which is what keeps the work grant-eligible.
How Much Does Cavity Wall Insulation Cost in Dublin?
As indicative market guidance rather than a price, a three-bed semi runs €1,200 to €2,000 before any grant, with the SEAI grant currently €1,800 and most homeowners left with €0 to €200. Dublin being a coastal capital county on Dublin Bay means access varies, and a quote should always come from a contractor who has seen the house.
Which Towns in Dublin Are Covered?
The contractors listed here work across Dublin, including Dublin, Swords, Lucan, Balbriggan, Blanchardstown, Tallaght, Dun Laoghaire and Rathmines. Most travel well beyond their registered address, so it is worth ringing a contractor based a county over rather than assuming they will not come.
Is My Dublin Home Suitable?
Solid brick in the pre-war terraces and inner suburbs, solid block through the 1950s and 1960s, cavity standard from the 1980s. Most Irish homes built between the 1920s and 1990s have unfilled cavity walls. Homes built before this period typically have solid walls and are not suitable for cavity fill. Homes built after about 1995 may already have cavity insulation installed.
How Is the SEAI Grant Paid in Dublin?
Through a One Stop Shop the grant comes off the price upfront. Apply yourself and you pay in full, then SEAI pays you back once the work is signed off. The grant for cavity wall insulation is €1,800, checked against SEAI on 31 July 2026. It works the same way everywhere in the country, so there is nothing specific to Dublin beyond choosing a contractor on the SEAI register, which every contractor on this page is.
Compare Cavity Wall Insulation Quotes in Dublin
Contact the contractors above directly and get three quotes before committing. Every one is on the SEAI register, which is what keeps the grant available to you.