Fingal
3.7% of homes built before 1945, 27 conservation areas. Swords, Blanchardstown and around.
Insulation grants in Dublin City
Dublin City has the oldest housing in the country. 62,470 homes here, 27.7% of the total, went up before 1945 — old enough that many have solid walls with no cavity to inject. That makes wrapping the outside or dry lining the inside the likely route, and it's why planning permission is a live question in this part of Dublin and barely anywhere else.
It's also the most expensive hand to be dealt, because the two solid-wall measures are the two dearest on the list.
- Free, and no obligation
- SEAI-registered contractors only
- Grant figures checked 15 August 2026
What Dublin City is built from
Nearly 15% of the city's homes predate 1919 and another 13% went up between 1919 and 1945 — the red-brick and stock-brick terraces through Rathmines, Ranelagh, Phibsborough, Drumcondra and the North Circular, built before cavity walls were normal in Ireland.
Those houses have nothing to inject. The grant-eligible options are external wall insulation or internal dry lining, and they are very different jobs to live through: one changes how the house looks, the other takes 60 to 100mm off the inside of every external wall.
The city isn't uniform though. Around a third of its stock went up after 1990, and the estates through Ballyfermot, Cabra and the northern fringe are cavity-walled like anywhere else. Read the era table beside this against your own street rather than the city average.
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 Dublin City was built
| Built | Homes | Share |
|---|---|---|
| Pre 1919 * | 33,576 | 14.9% |
| 1919 - 1945 | 28,894 | 12.8% |
| 1946 - 1960 | 33,167 | 14.7% |
| 1961 - 1970 | 20,468 | 9.1% |
| 1971 - 1980 | 19,174 | 8.5% |
| 1981 - 1990 | 15,690 | 7.0% |
| 1991 - 2000 | 23,263 | 10.3% |
| 2001 - 2010 | 31,546 | 14.0% |
| 2011 - 2015 | 3,791 | 1.7% |
| 2016 or later | 8,119 | 3.6% |
* the largest single group. Percentages are of 225,519 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.
Dublin City Council lists 24 conservation areas in the Dublin City Development Plan 2022–2028. They cover whole streets and squares rather than single terraces, and on top of them a much broader zoning layer. On top of that the council applies a separate zoning objective, Z2 residential conservation zoning, across 979 parcels totalling about 6.98 km². That layer is far wider than the 24 named areas and it exists to protect the character of whole residential neighbourhoods, so it's the one most likely to catch an ordinary house.
Dublin City is the only one of the four authorities running a second designation on top of its conservation areas, and the second one is far wider than the first.
Ask about your specific address. These boundaries run down the middle of streets and two neighbours can get different answers.
Conservation areas in Dublin City
24 listed by Dublin City Council in the Dublin City Development Plan 2022–2028
Among them, the three most recently designated, added since the 2016–2022 plan:
- Haddon Road and Victoria Road
- Hollybrook Road
- North Great George's Street
The full list and the maps are published by the council. Start at Dublin City Council.
Which measure, and what it leaves you to pay
On a solid-walled house the realistic choices are external wall insulation or internal dry lining. External performs better and leaves your rooms alone, but it changes the outside of the building, which is the whole objection on a red-brick terrace and the reason internal dry lining still gets specified across the inner suburbs.
Where the front elevation is constrained and the back is not, know that a partial job does not qualify. SEAI requires every external wall insulated for the wall grant to apply, and that is the rule that most often rules the measure out on a Dublin City terrace.
Grant amounts are national and do not vary by address. Read from seai.ie, checked 15 August 2026.
What applies in Dublin City
- External wall insulation
- €17,219
- Internal wall insulation
- €6,343
What a semi-detached home pays after the grant, at SEAI's median installed cost. The two solid-wall measures, which is what most of the older city needs. Cavity fill does not apply where there is no cavity.
The other three Dublin authorities
South Dublin
2.3% of homes built before 1945, 18 conservation areas. Tallaght, Clondalkin and around.
Dún Laoghaire-Rathdown
12.1% of homes built before 1945, 37 conservation areas. Dún Laoghaire, Blackrock and around.
No cost, no obligation
Get quotes from contractors working in Dublin City
Tell us about the house. We pass it to SEAI-registered contractors working in Dublin, and they come back to you with quotes. We're not a contractor and we never charge homeowners.
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Dublin City insulation questions
5 questions
Do I need planning permission for external wall insulation in Dublin City?
Dublin City is the only one of the four authorities running a second designation on top of its conservation areas, and the second one is far wider than the first. Dublin City Council lists 24 conservation areas in the Dublin City Development Plan 2022–2028, covering whole streets and squares rather than single terraces, and on top of them a much broader zoning layer, and it separately zones 979 parcels as residential conservation area. Ask about your specific address rather than your area.
Which insulation measure suits homes in Dublin City?
On a solid-walled house the realistic choices are external wall insulation or internal dry lining. External performs better and leaves your rooms alone, but it changes the outside of the building, which is the whole objection on a red-brick terrace and the reason internal dry lining still gets specified across the inner suburbs. The largest single group of homes here, 14.9% of the total, was built in Pre 1919. A borescope through one drilled hole settles what your own wall is.
Is my Dublin City home old enough to qualify?
SEAI requires the home built and occupied before 31 December 2010, with its own MPRN. 91.2% of homes in Dublin City clear that — 205,778 of 225,519 households. The 5.3% built since do not, and they went up to a considerably better standard to begin with.
What was Dublin City mostly built in?
Pre 1919, which accounts for 14.9% of its housing and is the single largest group. Nearly 15% of the city's homes predate 1919 and another 13% went up between 1919 and 1945 — the red-brick and stock-brick terraces through Rathmines, Ranelagh, Phibsborough, Drumcondra and the North Circular, built before cavity walls were normal in Ireland.
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. Where the front elevation is constrained and the back is not, know that a partial job does not qualify. SEAI requires every external wall insulated for the wall grant to apply, and that is the rule that most often rules the measure out on a Dublin City terrace.