Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Co. Dublin, and Thornhill House (a Protected Structure) A94W7C5
Retention of boundary, landscaping, and layout changes within the grounds of Thornhill House, a protected structure.
D25A/0862/WEB · Dun Laoghaire Rathdown County Council · Lodged 12 November 2025
- Reference
- D25A/0862/WEB
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 12 November 2025
Summary
AI-generatedRetention permission is sought for various alterations within the grounds of Thornhill Oaks and Thornhill House. Changes include the omission of railings, gates, a hedge, and a pedestrian crossing around the central green, alongside fence additions and a relocated water feature.
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
- Apply for retention permission for development within the grounds of thornhill oaks, and thornhill house, a protected structure (rps. 936). The development consists of the retention of an following: (i) omission of railings to perimeter of central green; (ii) omission of 4no. X pedestrian gates to the central green; (iii) omission of hedge to perimeter of the central green; (iv) omission of pedestrian crossing to the road on the southern side of the central green; (v) addition of a low metal fence to centre/side of new hedge boundaries to rear gardens of thornhill house & houses 60
- 64 (inclusive); (vi) provision of a pedestrian gate to the rendered blockwork wall to the southern boundary of the rear garden of house 64; (vii) relocation of water feature from side boundary wall of house no. 64 to inner face of wall to communal courtyard serving houses 60 to 64
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 |
|---|---|---|---|
| 61 The Stables, Thornhill Oaks, Mount Merrionprice excludes VAT | Aug 2025 | €889,868 | 27 m |
| 50 Thornhill Oaks, Cherry Garth, Mount Merrion | Sept 2025 | €1,500,000 | 42 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrion | Dec 2025 | €1,430,135 | 45 m |
| Thornhill, Cherry Garth, Mount Merrion | Aug 2025 | €1,750,000 | 48 m |
| 63 Thornhill Oaks, Blackrock, Co. Dublin | May 2026 | €870,000 | 53 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrionprice excludes VAT | Jan 2025 | €1,145,374 | 53 m |
| Apt.28 - Thornhill Oaks, Cherry Garth - Mount Merrion, Blackrock | Jul 2025 | €999,999 | 53 m |
| 62 Thornhill Oaks, Blackrock, Co. Dublinprice excludes VAT | Mar 2026 | €859,031 | 63 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 received12 November 2025
- Decision due15 January 2026
- Decision issued14 January 2026
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
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
- RefusedAt this site
Permission for development. The proposed development will consist of the temporary removal of the eastern…
At a site of c.1.39ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co. Dublin (Protected Structure Ref. No. 936)
D20A/0057Dún Laoghaire–RathdownLodged 28 Jan 2020Alterations
- RefusedAt this site
Permission for development. The proposed development will consist of the reconfiguration and redesign of the…
Site of c. 1.39 ha, Thornhill House, CherryGarth, Mount Merrion, Blackrock, Co. Dublin
D20A/0432Dún Laoghaire–RathdownLodged 22 Jun 2020Housing estate
- RefusedAt this site
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 2021Housing estate
- InvalidAt this site
Permission for development. The proposed development will consist of the reconfiguration and redesign of the…
Site of c. 1.39 ha, Thornhill House, CherryGarth, Mount Merrion, Blackrock, Co. Dublin
D20A/0274Dún Laoghaire–RathdownLodged 30 Mar 2020Housing estate
- Compliance submissionAt this site
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 submissionAt this site
Compliance with Condition no. 21 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/C15Dún Laoghaire–RathdownLodged 1 Feb 2024Other
- Compliance submissionAt this site
Compliance with Condition no. 11 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/C10Dún Laoghaire–RathdownLodged 28 Jun 2023Other
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
- 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
- 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
- GrantedRetention
Retention permission for refurbishment works to their existing dwelling house, a protected structure.…
15, Idrone Terrace, Blackrock, Dublin, A94F240
D23A/0197Dún Laoghaire–RathdownLodged 16 Jun 2023
- GrantedRetention
Retention permission for works to a protected structure including — the relocation of the front boundary of…
Dornden House, Dornden Park, Booterstown, Blackrock, Dublin, A94E729
D23A/0545Dún Laoghaire–RathdownLodged 17 Aug 2023
- GrantedRetention
Permission for retention of the following works to a dwelling — Erection of all railings to the exterior of…
Ballywilliam House, Ballywilliam, Kinsale, Co Cork
217489corkLodged 22 Dec 2021
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