Site at 40 Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
Redesign of a permitted house to provide a part single-storey, part two-storey dwelling.
D23A/0782 · Dun Laoghaire Rathdown County Council · Lodged 11 December 2023
- Reference
- D23A/0782
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 11 December 2023
Summary
AI-generatedThe application proposes the redesign of the permitted house at No. 40 Thornhill Oaks to provide a part single-storey and part two-storey dwelling. No works are proposed to the nearby Thornhill House, which is a protected structure.
- 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
Redesign of the permitted no. 40 thornhill oaks (d20a/0432 abp 308150-20) to now provide a part single/part 2 storey dwelling at this location. No works are proposed to thornhill house, a protected structure (rps no. 936), under this planning application.
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 received11 December 2023
- Decision due13 February 2024
- Decision issued24 January 2024
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
Redesign of the permitted no. 40 Thornhill Oaks (D20A/0432, ABP308150-20) to provide a part single/part two…
Site at Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
D24A/0059Dún Laoghaire–RathdownLodged 31 Jan 2024Alterations
- 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.
- RefusedAlterations
Redesign of the permitted no. 40 Thornhill Oaks (D20A/0432, ABP308150-20) to provide a part single/part two…
Site at Thornhill Oaks, Mount Merrion, Blackrock, Co Dublin
D24A/0059Dún Laoghaire–RathdownLodged 31 Jan 2024
- 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
- 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
- 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
- GrantedAlterations
The development will consist of : Retention permission and permission for alterations to a residential…
43 Church Street, Howth, Co. Dublin, D13CP8R
F26A/0304EFingalLodged 15 Apr 2026
- GrantedAlterations
Permission to vary previously permitted development granted under Planning Ref. No. 08/650 as extended under…
Cnoc na Mara Blackrock Cove , Golf Links Road , Haggardstown Co Louth
20429LouthLodged 19 Jun 2020
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