Dublin City
27.7% of homes built before 1945, 24 conservation areas. Rathmines, Ranelagh and around.
Insulation grants in South Dublin
South Dublin is the 1970s estate belt. 23.1% of its homes went up between 1971 and 1980 and only 2.3% predate 1945, so cavity wall insulation is the measure for most houses here. The live question is not usually planning permission — it is whether somebody has already filled that cavity, and how well they did it.
Its conservation areas are drawn more tightly than anywhere else in Dublin, so the vast majority of homes here sit outside them.
- Free, and no obligation
- SEAI-registered contractors only
- Grant figures checked 15 August 2026
What South Dublin is built from
The county is young by Dublin standards. Just 916 homes in the whole of South Dublin predate 1919, against more than 33,000 in Dublin City. The Tallaght, Clondalkin and Firhouse estates that make up most of the housing here went up from the 1960s onward, and almost a quarter of everything standing was built in the 1970s alone.
Housing of that age was built with a cavity, which is the cheapest wall to insulate by a wide margin — provided the cavity is still empty. A lot of it isn't. Stock from this era was the main target of earlier fill programmes, so on a South Dublin semi the first question a contractor asks is usually what's already in the wall.
If the answer is old fill that has slumped or got wet, it has to come out before the wall can be insulated again. That is a separate job with no grant of its own, and it opens a second wall grant on the other side of it.
The census records when a home was built, not what its walls are made of. Age is a good proxy; the actual test is a borescope through one drilled hole.
When South Dublin was built
| Built | Homes | Share |
|---|---|---|
| Pre 1919 | 916 | 0.9% |
| 1919 - 1945 | 1,400 | 1.4% |
| 1946 - 1960 | 6,056 | 6.0% |
| 1961 - 1970 | 9,598 | 9.6% |
| 1971 - 1980 * | 23,206 | 23.1% |
| 1981 - 1990 | 13,319 | 13.3% |
| 1991 - 2000 | 16,659 | 16.6% |
| 2001 - 2010 | 18,096 | 18.0% |
| 2011 - 2015 | 2,142 | 2.1% |
| 2016 or later | 6,945 | 6.9% |
* the largest single group. Percentages are of 100,262 households, and exclude the small number the census records as "not stated".
Planning permission, and why the answer is local
Only external wall insulation raises this, and only where a home is a protected structure or sits inside an Architectural Conservation Area. Each local authority designates its own in its own development plan, and the four Dublin authorities have drawn them very differently.
South Dublin County Council lists 18 conservation areas in the South Dublin County Development Plan 2022–2028. They cover old village centres and individual rows of cottages, drawn tightly.
South Dublin draws its conservation areas more tightly than the other three, which makes this the one page in this set that can honestly say planning is unlikely to be your problem.
Ask about your specific address. These boundaries run down the middle of streets and two neighbours can get different answers.
Conservation areas in South Dublin
18 listed by South Dublin County Council in the South Dublin County Development Plan 2022–2028
Among them, village cores and named cottage terraces:
- Lucan Village
- Clondalkin Village
- Tallaght Village
- Rathfarnham Village
- Balrothery Cottages, Tallaght
The full list and the maps are published by the council. Start at South Dublin County Council.
Which measure, and what it leaves you to pay
Cavity wall insulation is the default here and it is the cheapest measure available. If the cavity is already filled and performing, the wall is done and the attic is where the remaining money is.
If the cavity is filled and causing trouble, the sequence is extraction first, then either external wall insulation or internal dry lining. SEAI now allows a second wall measure where a cavity grant was paid before, so the reinstatement is grant-eligible even though the removal is not.
Grant amounts are national and do not vary by address. Read from seai.ie, checked 15 August 2026.
What applies in South Dublin
- Cavity wall insulation
- €285
- Attic insulation
- €601
What a semi-detached home pays after the grant, at SEAI's median installed cost. The two measures that fit a 1970s estate semi. If the cavity is already filled and failing, extraction comes first and carries no grant of its own.
The other three Dublin authorities
Fingal
3.7% of homes built before 1945, 27 conservation areas. Swords, Blanchardstown and around.
Dún Laoghaire-Rathdown
12.1% of homes built before 1945, 37 conservation areas. Dún Laoghaire, Blackrock and around.
No cost, no obligation
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South Dublin insulation questions
5 questions
Do I need planning permission for external wall insulation in South Dublin?
South Dublin draws its conservation areas more tightly than the other three, which makes this the one page in this set that can honestly say planning is unlikely to be your problem. South Dublin County Council lists 18 conservation areas in the South Dublin County Development Plan 2022–2028, covering old village centres and individual rows of cottages, drawn tightly. Ask about your specific address rather than your area.
Which insulation measure suits homes in South Dublin?
Cavity wall insulation is the default here and it is the cheapest measure available. If the cavity is already filled and performing, the wall is done and the attic is where the remaining money is. The largest single group of homes here, 23.1% of the total, was built in 1971 - 1980. A borescope through one drilled hole settles what your own wall is.
Is my South Dublin home old enough to qualify?
SEAI requires the home built and occupied before 31 December 2010, with its own MPRN. 89.0% of homes in South Dublin clear that — 89,250 of 100,262 households. The 9.1% built since do not, and they went up to a considerably better standard to begin with.
What was South Dublin mostly built in?
1971 - 1980, which accounts for 23.1% of its housing and is the single largest group. The county is young by Dublin standards. Just 916 homes in the whole of South Dublin predate 1919, against more than 33,000 in Dublin City. The Tallaght, Clondalkin and Firhouse estates that make up most of the housing here went up from the 1960s onward, and almost a quarter of everything standing was built in the 1970s alone.
Does the grant change depending on where I live?
No. SEAI sets amounts by measure and dwelling type, not by address — €6,000 on a semi-detached external wall job anywhere in the country. What changes locally is which measure your house can take. If the cavity is filled and causing trouble, the sequence is extraction first, then either external wall insulation or internal dry lining. SEAI now allows a second wall measure where a cavity grant was paid before, so the reinstatement is grant-eligible even though the removal is not.