Site at Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
Redesign of a permitted house to provide a part-single, part-two-storey dwelling, with no works to the nearby protected Thornhill House.
D24A/0059 · Dun Laoghaire Rathdown County Council · Lodged 31 January 2024
- Reference
- D24A/0059
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 31 January 2024
Summary
AI-generatedThe application seeks a redesign of the previously permitted house number 40 at Thornhill Oaks to provide a part-single and part-two-storey dwelling. No works are proposed to Thornhill House, which is a Protected Structure.
- 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
Redesign of the permitted no. 40 thornhill oaks (d20a/0432, abp308150-20) to provide a part single/part two storey at this location. No works are proposed to thornhill house, a protected structure (rps 936).
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 |
|---|---|---|---|
| 56 Thornhill Oaks, Mount Merrionprice excludes VAT | Mar 2025 | €775,330 | 19 m |
| 2 Cherrygarth, Mount Merrionprice excludes VAT | Oct 2025 | €881,057 | 40 m |
| Apt.28 - Thornhill Oaks, Cherry Garth - Mount Merrion, Blackrock | Jul 2025 | €999,999 | 57 m |
| 61 The Stables, Thornhill Oaks, Mount Merrionprice excludes VAT | Aug 2025 | €889,868 | 60 m |
| 56 Trees Rd, Mount Merrion, Blackrock | Apr 2025 | €1,285,000 | 66 m |
| 4 Cherry Garth, Mount Merrion, Blackrock | Aug 2025 | €1,650,000 | 72 m |
| 63 Thornhill Oaks, Blackrock, Co. Dublin | May 2026 | €870,000 | 97 m |
| 31 Trees Rd, Mount Merrion, Blackrock | Nov 2025 | €1,740,000 | 104 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 January 2024
- Decision due26 March 2024
- Decision issued25 March 2024
- Appeal submitted22 April 2024
- Appeal decided31 January 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
Redesign of the permitted No. 40 Thornhill Oaks (D20A/0432 ABP 308150-20) to now provide a part single/part 2…
Site at 40 Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
D23A/0782Dún Laoghaire–RathdownLodged 11 Dec 2023New dwelling
- WithdrawnAt this site
Development will consist of the redesign of the permitted gatelodge house (D20A/0432, ABP-308150-20) to now…
Site at Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
D23A/0013Dún Laoghaire–RathdownLodged 9 Jan 2023New dwelling
- Granted40 m away
Permission is sought for proposed extension and alterations to existing bungalow dwelling including new…
1, Cherry Garth, Mount Merrion, Co. Dublin
D12B/0090Dún Laoghaire–RathdownLodged 16 Mar 2012Extension
- Granted50 m away
Permission is sought for the demolition of an existing chimney and reinstatement of roof slates
62, Trees Road, Mount Merrion, Co. Dublin
D17B/0547Dún Laoghaire–RathdownLodged 1 Dec 2017Alterations
- Granted50 m away
For conversion of attic space for three new bedrooms and bathroom with two dormer windows to front elevation…
2, Cherrygarth, Mount Merrion, Co. Dublin
D06B/0371Dún Laoghaire–RathdownLodged 28 Apr 2006Extension
- Granted50 m away
Permission is sought for: a) the conversion of existing garage with associated works, including the provision…
68, Trees Road Lower, Mount Merrion, Co. Dublin
D15B/0435Dún Laoghaire–RathdownLodged 27 Nov 2015Extension
- Granted60 m away
Permission for development on a site of c. 1.39 ha to amend the apartment block and basement permitted under…
Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co. Dublin
D19A/0748Dún Laoghaire–RathdownLodged 8 Oct 2019Apartments
- Refused60 m away
Permission for development. The proposed development comprises of 47 no. dwellings provided as follows; 33…
Thornhill House, Cherrygarth, Mount Merrion, Blackrock, Co. Dublin
D17A/0240Dún Laoghaire–RathdownLodged 26 Sept 2017Apartments
Related developments
Similar applications
Ranked by what these developments actually propose, not by matching words — so you can see how comparable applications were decided.
- InvalidNew dwelling
Redesign of the permitted No. 40 Thornhill Oaks (D20A/0432 ABP 308150-20) to now provide a part single/part 2…
Site at 40 Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
D23A/0782Dún Laoghaire–RathdownLodged 11 Dec 2023
- WithdrawnNew dwelling
Development will consist of the redesign of the permitted gatelodge house (D20A/0432, ABP-308150-20) to now…
Site at Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
D23A/0013Dún Laoghaire–RathdownLodged 9 Jan 2023
- GrantedRetention
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 2025
- RefusedHousing estate
Permission for development. The proposed development will consist of: Conservation works to Thornhill House,…
Site of c. 1.39 ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co.Dublin A Protected Structure (RPS No. 936)
D21A/0161Dún Laoghaire–RathdownLodged 26 Feb 2021
- GrantedAlterations
PROTECTED STRUCTURE (RPS No.:3155): The development will consist of amendments to previously granted…
28, Garville Avenue, Rathgar, Dublin 6, D06 DR97
4013/20Dublin CityLodged 22 Dec 2020
- GrantedExtension
PROTECTED STRUCTURE: The development will consist of the demolition of a small one storey extension to the…
1 Raglan Road, Ballsbridge, Dublin 4-at the junction of Raglan Road and Pembroke Lane.
5014/23Dublin CityLodged 20 Dec 2023
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