49 Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Dublin, A94Y8X5
Attic conversion to a bedroom with a rear dormer window in Mount Merrion.
D26B/0071/WEB · Dun Laoghaire Rathdown County Council · Lodged 6 February 2026
- Reference
- D26B/0071/WEB
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 6 February 2026
Summary
AI-generatedThis application proposes the conversion of the existing attic space into a new bedroom and en-suite. The works include a dormer window and rooflight to the rear, and one rooflight to the front elevation.
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 consists of the following: conversion of existing attic space to new bedroom and en-suite with dormer window and roof light to the rear of the property and 1no. Rooflight to the front elevation, and all associated site works necessary to facilitate the development.
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 |
|---|---|---|---|
| 49 Thornhill Oaks, Cherry Garth, Mount Merrion | Dec 2025 | €1,430,135 | 1 m |
| 50 Thornhill Oaks, Cherry Garth, Mount Merrion | Sept 2025 | €1,500,000 | 8 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrionprice excludes VAT | Jan 2025 | €1,145,374 | 9 m |
| 61 The Stables, Thornhill Oaks, Mount Merrionprice excludes VAT | Aug 2025 | €889,868 | 54 m |
| Thornhill, Cherry Garth, Mount Merrion | Aug 2025 | €1,750,000 | 59 m |
| Apt.28 - Thornhill Oaks, Cherry Garth - Mount Merrion, Blackrock | Jul 2025 | €999,999 | 73 m |
| 63 Thornhill Oaks, Blackrock, Co. Dublin | May 2026 | €870,000 | 81 m |
| 62 Thornhill Oaks, Blackrock, Co. Dublinprice excludes VAT | Mar 2026 | €859,031 | 85 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 2026
- Decision due2 April 2026
- Decision issued31 March 2026
In the area
Applications near this site
Other planning applications within about 500 m — what else is being proposed or built nearby.
- RefusedAt this site
Permission is sought for the subdivision of the existing property of (0.054 hectares) into two plots, 43 &…
43, Cherrygarth, Mount Merrion, Blackrock, Dublin, A94PF10
D23A/0185Dún Laoghaire–RathdownLodged 22 Mar 2023New dwelling
- InvalidAt this site
Permission is sought for the subdivision of the existing property of (0.054 hectares0 into two plots.…
43, Cherrygarth, Mount Merrion, Blackrock, Dublin, A94PF10
D22A/1016Dún Laoghaire–RathdownLodged 21 Dec 2022New dwelling
- Granted40 m away
Permission for a single storey extension to the front and side including the conversion of the existing…
Cheriton, 44 Cherrygarth, Mount Merrion, Blackrock, Co Dublin, A94A6P6
D22A/0998Dún Laoghaire–RathdownLodged 15 Dec 2022Extension
- Granted40 m away
Apply for Retention Permission for development within the grounds of Thornhill Oaks, and Thornhill House, a…
Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Co. Dublin, and Thornhill House (a Protected Structure) A94W7C5
D25A/0862/WEBDún Laoghaire–RathdownLodged 12 Nov 2025Retention
- Granted40 m away
Oak View Property Developments Limited, intend to apply for Retention Permission for development within the…
Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Dublin, A94W7C5
D24B/0425/WEBDún Laoghaire–RathdownLodged 8 Oct 2024Retention
- Compliance submission50 m away
Compliance with Condition no. 19 of Reg Ref no. ABP-31028521 (D21A/0161)
Site of c. 1.39 ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co.Dublin A Protected Structure (RPS No. 936)
D21A/0161/C14Dún Laoghaire–RathdownLodged 1 Feb 2024Other
- Compliance submission50 m away
Compliance with Condition no. 20 of Reg Ref no. ABP-31028521 (D21A/0161)
Site of c. 1.39 ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co.Dublin A Protected Structure (RPS No. 936)
D21A/0161/C9Dún Laoghaire–RathdownLodged 23 Jun 2023Other
- Compliance submission50 m away
Compliance with Condition no.5 of Reg Ref no. ABP-31028521 (D21A/0161)
Site of c. 1.39 ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co.Dublin A Protected Structure (RPS No. 936)
D21A/0161/C3Dún Laoghaire–RathdownLodged 4 Apr 2023Other
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