40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0
Retention of a house demolition and permission to build a new two-storey house in Mount Merrion.
D25A/0089/WEB · Dun Laoghaire Rathdown County Council · Lodged 6 February 2025
- Reference
- D25A/0089/WEB
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission for Retention
- Received
- 6 February 2025
Summary
AI-generatedRetention permission is sought for the complete demolition of the original semi-detached house and garage. Permission is also sought to construct a replacement two-storey house with a single-storey rear extension and a widened driveway entrance.
- Residential unit
- 1
- Storeys
- 2
Generated from the description above by an AI model and may contain mistakes. The council’s description is the authoritative record.
Official record
Development description
Retention permission is sought for demolition of the existing dwelling and garage in its entirety, permission is sought for the construction of a new two storey house and single storey extension to rear (with 1 no rooflight); increase in width of existing front vehicular entrance & all associated site works to a demolished two storey semi-detached house at 40 thornhill road, mount merrion, blackrock, co. Dublin, a94 k4x0.
Land-use zoning
What this land is zoned for
“A To provide residential development and improve residential amenity while protecting the existing residential amenities”
Objective set by the COUNTY DEVELOPMENT PLAN 2022-2028 (2022–2028). The planning authority decides each application on its own merits — this is the zoning context, not a compliance assessment.
Read the zoning objectives in the development planBuilt & sold
What happened next
Beyond the decision: whether this development was built, and what property here has sold for.
Built — construction complete
A commencement notice records works starting on 9 September 2024.
Notified floor area: 130 m²
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 7 Clonmore Rd, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 115 m |
| 98 Lr Kilmacud Rd, Stillorgan, Dublin | Jul 2025 | €1,187,000 | 156 m |
| 33 Clonmore Rd, Mount Merrion, Dublin | Apr 2026 | €1,425,000 | 158 m |
| 17 Dale Close, Stillorgan | Nov 2025 | €920,000 | 207 m |
| 13 Redesdale Rd, Mount Merrion, Dublin | Sept 2025 | €850,000 | 216 m |
| 28 South Ave, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 224 m |
| 24 South Ave, Mount Merrion, Dublin | Dec 2025 | €1,580,000 | 224 m |
| 10 Redesdale Rd, Mount Merrion, Co Dublin | Jun 2026 | €1,220,000 | 226 m |
Nearby properties, not this site — a guide to local values.
Sources: Building Control Management System (commencement notices) and the Residential Property Price Register, licensed under CC BY 4.0. Records are matched to this application by location and may not be exhaustive; always confirm against the official source before relying on them.
Key dates
Timeline
- Application received6 February 2025
- Decision due2 April 2025
- Decision issued2 April 2025
In the area
Applications near this site
Other planning applications within about 500 m — what else is being proposed or built nearby.
- InvalidAt this site
Permission is sought for modifications to previously permitted Planning Application reg/ref: D23A/0302 to…
40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0
D24A/0906/WEBDún Laoghaire–RathdownLodged 13 Nov 2024Retention
- GrantedAt this site
Demolition of the single storey conservatory extension to rear and the garage and store to side to allow for…
40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0
D23A/0302Dún Laoghaire–RathdownLodged 8 May 2023Extension
- Compliance submissionAt this site
Compliance with Condition No 12a of Reg Ref No. D25A/0089/WEB
40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0
D25A/0089/WEB/C1Dún Laoghaire–RathdownLodged 6 Jun 2025Other
- Awaiting decisionAt this site
Compliance with Condition No. 3 of Reg Ref No. D23A/0302
40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0
D23A/0302/C1Dún Laoghaire–RathdownLodged 1 Nov 2024Other
- GrantedAt this site
Permission is sought for demolition of existing single storey flat roof extension to rear and side garage and…
42, Thornhill Road, Mount Merrion, Co. Dublin
D12A/0504Dún Laoghaire–RathdownLodged 18 Dec 2012Extension
- GrantedAt this site
Retention permission. The area to be retained consists of the infilled area to the rear of the ground floor…
36 Thornhill Road, Mount Merrion, Co. Dublin, A94A6K2
D22B/0072Dún Laoghaire–RathdownLodged 17 Feb 2022Retention
- GrantedAt this site
Retention is sought for widened (3.2m) vehicular entrance to the front and permission is sought for the…
36, Thornhill Road, Mount Merrion, Co Dublin
D20A/0738Dún Laoghaire–RathdownLodged 9 Oct 2020Extension
- Granted30 m away
For the following development — (a) A single storey rear dining room rear dining room extension. (b) A two…
46, Thornhill Road, Mount Merrion, Co. Dublin
D05B/0470Dún Laoghaire–RathdownLodged 22 Jun 2005Extension
Related developments
Similar applications
Ranked by what these developments actually propose, not by matching words — so you can see how comparable applications were decided.
- GrantedExtension
Renovations and extensions to the existing two-storey, detached house at 46 Wilson Road, Mount Merrion,…
46, Wilson Road, Mount Merrion, Blackrock, Dublin, A94E8F5
D25B/0120/WEBDún Laoghaire–RathdownLodged 6 Mar 2025
- InvalidExtension
Permission for development at 22 Woodlands Park, Mount Merrion Avenue, Blackrock, Co. Dublin, A94 PF22. The…
22, Woodlands Park, Mount Merrion Avenue, Blackrock, Co. Dublin, A94PF22
D24A/0763/WEBDún Laoghaire–RathdownLodged 24 Sept 2024
- GrantedExtension
The applicants intend to apply for permission for the development of an existing semi-detached dwelling at…
51, Sycamore Road, Mount Merrion, Blackrock, Dublin, A94K8X7
D25A/0121/WEBDún Laoghaire–RathdownLodged 18 Feb 2025
- GrantedExtension
Permission for development consisting of demolition of existing single storey extension to rear and proposed…
Glenside, 63, Mount Merrion Avenue, Blackrock, Co Dublin, A94Y6W3
D20A/0922Dún Laoghaire–RathdownLodged 9 Dec 2020
- GrantedExtension
Permission for development at 39 Fairyhill, Stillorgan Park, Blackrock, Co. Dublin, A94 WF98. The development…
39, Fairyhill, Stillorgan Park, Blackrock, Co. Dublin, A94WF98
D24A/0340/WEBDún Laoghaire–RathdownLodged 17 May 2024
- GrantedAlterations
Planning Permission is sought by the applicants for widening of existing vehicular entrance gate with 2no.…
23, St. Thomas Road, Mount Merrion, Blackrock, Co. Dublin, A94H778
D24A/0674Dún Laoghaire–RathdownLodged 30 Aug 2024
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