34, Thornhill Road, Mount Merrion, Blackrock, County Dublin, A94PE89
Demolition of a garage and outhouses, construction of side and rear extensions, and an attic conversion with a rear dormer.
D18B/0390 · Dun Laoghaire Rathdown County Council · Lodged 31 August 2018
- Reference
- D18B/0390
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 31 August 2018
Summary
AI-generatedThe development consists of the demolition of an existing garage and outhouses, alongside the removal of existing windows and doors. The applicant intends to construct a two-storey side extension, a single-storey rear extension, and convert the attic to include a new flat roof dormer along the rear roof.
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
The development will consist of the demolition of the existing garage, various outhouses and the removal of all existing windows and external doors. We intend to erect a two storey extension to the side and a single storey extension to the back of the property. We also intend to convert the attic and construct a new flat roof dormer along the rear roof.
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.
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 7 Clonmore Rd, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 130 m |
| 33 Clonmore Rd, Mount Merrion, Dublin | Apr 2026 | €1,425,000 | 134 m |
| 98 Lr Kilmacud Rd, Stillorgan, Dublin | Jul 2025 | €1,187,000 | 184 m |
| 24 South Ave, Mount Merrion, Dublin | Dec 2025 | €1,580,000 | 192 m |
| 28 South Ave, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 192 m |
| 32 South Ave, Mount Merrion, Dublin | Jan 2026 | €1,725,000 | 197 m |
| 17 Dale Close, Stillorgan | Nov 2025 | €920,000 | 209 m |
| 14 South Avenue, Mount Merrion, Co Dublin | Sept 2025 | €920,000 | 215 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 received31 August 2018
- Decision issued23 October 2018
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
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
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
- 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 for the demolition of existing garage structure and sheds, rear single story extension and front…
30 Thornhill Road, Mount Merrion, Co Dublin
D17A/0333Dún Laoghaire–RathdownLodged 11 Apr 2017Extension
- Granted30 m away
The demolition of the existing single storey garage to the side of the semi-detached two-storey house —…
28, Thornhill Road, Mount Merrion, Co. Dublin
D08A/1108Dún Laoghaire–RathdownLodged 1 Dec 2008Extension
- Refused30 m away
(1). The demolition of the existing garage/sheds to the side and chimney stack to the rear of the existing…
28, Thornhill Road, Blackrock, Dublin
D08A/0831Dún Laoghaire–RathdownLodged 17 Jul 2008Extension
- Awaiting decision30 m away
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 submission30 m away
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
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
The development will consist of the demolition of the existing garage, various outhouses and the removal of…
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D22B/0041Dún Laoghaire–RathdownLodged 2 Feb 2022
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D24B/0193Dún Laoghaire–RathdownLodged 26 Apr 2024
- InvalidExtension
The development will consist of the conversion of the existing garage and the partial demolition of walls to…
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WEB1693/21Dublin CityLodged 28 Jun 2021
- GrantedExtension
The development will consist of the demolition of an existing rear single storey extension and garage and the…
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