36, Thornhill Road, Mount Merrion, Co Dublin
Demolition of garage and construction of two-storey front and side extension, single-storey rear extension, and dormer window.
D20A/0738 · Dun Laoghaire Rathdown County Council · Lodged 9 October 2020
- Reference
- D20A/0738
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 9 October 2020
Summary
AI-generatedThe applicant is seeking permission to demolish an existing garage and boiler room to the side of a semi-detached house. They plan to construct a two-storey extension to the front and side, a single-storey extension to the rear, and add a rear dormer with front and side rooflights. Retention is also sought for a widened vehicular entrance.
- 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 is sought for widened (3.2m) vehicular entrance to the front and permission is sought for the demolition of garage and boiler room to side and single storey extension to rear and the construction of a 2-storey extension to the front and side, single storey extension to the rear, dormer to the rear, rooflights to the front and side of existing 2-storey semi-detached dwelling and associated site works
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 1 February 2021.
Notified floor area: 215 m²
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 7 Clonmore Rd, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 128 m |
| 33 Clonmore Rd, Mount Merrion, Dublin | Apr 2026 | €1,425,000 | 145 m |
| 98 Lr Kilmacud Rd, Stillorgan, Dublin | Jul 2025 | €1,187,000 | 171 m |
| 17 Dale Close, Stillorgan | Nov 2025 | €920,000 | 203 m |
| 24 South Ave, Mount Merrion, Dublin | Dec 2025 | €1,580,000 | 204 m |
| 28 South Ave, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 205 m |
| 32 South Ave, Mount Merrion, Dublin | Jan 2026 | €1,725,000 | 209 m |
| 14 South Avenue, Mount Merrion, Co Dublin | Sept 2025 | €920,000 | 227 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 received9 October 2020
- Decision issued1 December 2020
In the area
Applications near this site
Other planning applications within about 500 m — what else is being proposed or built nearby.
- 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
Permission. The development will consist of a change of ground floor and attic floor plan to that previously…
34, Thornhill Road, Mount Merrion, Blackrock, County Dublin A94PE89
D19B/0061Dún Laoghaire–RathdownLodged 5 Apr 2019Alterations
- GrantedAt this site
The development will consist of the demolition of the existing garage, various outhouses and the removal of…
34, Thornhill Road, Mount Merrion, Blackrock, County Dublin, A94PE89
D18B/0390Dún Laoghaire–RathdownLodged 31 Aug 2018Extension
- 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
- 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
- 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
Retention Permission is sought for demolition of the existing dwelling and garage in its entirety, Permission…
40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0
D25A/0089/WEBDún Laoghaire–RathdownLodged 6 Feb 2025New dwelling
- 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
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
Retention permission is sought for: widening vehicular entrance to 3.685m; lowering cill to ground floor…
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D20A/0018Dún Laoghaire–RathdownLodged 14 Jan 2020
- GrantedExtension
Retention of existing alterations & extensions and permission for new alteration/extensions to the existing…
78, Wainsfort Road, Terenure, Dublin 6W, D6W A898
SD19B/0299South DublinLodged 30 Jul 2019
- GrantedExtension
RETENTION AND PERMISSION: Permission for the demolition of the existing garage to the side & front, the…
68, Ennafort Park, Raheny, Dublin 5
2104/21Dublin CityLodged 28 Jan 2021
- GrantedExtension
Retention of existing rear attic dormer window and rear rooflight, existing front rooflights and widen…
36, Marian Crescent, Dublin 14
SD20B/0312South DublinLodged 27 Aug 2020
- GrantedExtension
PERMISSION & RETENTION: This development will consist of retention permission for (a) single storey side &…
No. 12, Ballygall Cresent, Finglas, Dublin 11, D11 K4N2
4494/18Dublin CityLodged 29 Nov 2018
- GrantedExtension
Permission is sought for alterations and additions to an existing 2-storey semi-detached dwelling. The…
35 Eden Park Drive, Goatstown, Dublin 14.
D22A/0515Dún Laoghaire–RathdownLodged 9 Dec 2022
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