Site of c. 1.39 ha, Thornhill House, CherryGarth, Mount Merrion, Blackrock, Co. Dublin
Reconfiguration of a permitted housing development in Mount Merrion to increase the number of houses from 9 to 15.
D20A/0432 · Dun Laoghaire Rathdown County Council · Lodged 22 June 2020
- Reference
- D20A/0432
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 22 June 2020
Summary
AI-generatedThe applicant seeks to redesign a previously permitted housing scheme at Thornhill House. The amendment proposes to increase the density from 9 houses to 15 houses. The works will also require reconfiguring the internal road layout and relocating an ESB substation.
- Residential units
- 15
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
Permission for development. The proposed development will consist of the reconfiguration and redesign of the permitted housing units (dun laoghaire rathdown county council reg. Ref. D17a/0240; an bord pleanála ref. Pl06d. 300244) to provide an increase from 9 no. Houses (comprising 4no. Four bed and 5no. Five bed units) to 15 no. Houses (comprising 3no. Three bed and 12no. Four bed units). Additional works include reconfiguration of the internal road layout, relocation of esb substation, amend...
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 | 47 m |
| Thornhill, Cherry Garth, Mount Merrion | Aug 2025 | €1,750,000 | 49 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrion | Dec 2025 | €1,430,135 | 50 m |
| 63 Thornhill Oaks, Blackrock, Co. Dublin | May 2026 | €870,000 | 51 m |
| Apt.28 - Thornhill Oaks, Cherry Garth - Mount Merrion, Blackrock | Jul 2025 | €999,999 | 53 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrionprice excludes VAT | Jan 2025 | €1,145,374 | 58 m |
| 62 Thornhill Oaks, Blackrock, Co. Dublinprice excludes VAT | Mar 2026 | €859,031 | 62 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 received22 June 2020
- Decision issued14 August 2020
- Appeal submitted10 September 2020
- Appeal decided30 June 2021
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 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
- 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
- GrantedAt this site
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
- 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
- Compliance submissionAt this site
Compliance with Condition no.4 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/C7Dún Laoghaire–RathdownLodged 9 Jun 2023Other
- 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
- Compliance submissionAt this site
Compliance with Condition no.2 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/C1Dún Laoghaire–RathdownLodged 4 Apr 2023Other
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Permission for development. The proposed development will consist of the reconfiguration and redesign of the…
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