Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co. Dublin
Amendments to a permitted apartment block in Mount Merrion to increase the unit count from 33 to 39.
D19A/0748 · Dun Laoghaire Rathdown County Council · Lodged 8 October 2019
- Reference
- D19A/0748
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 8 October 2019
Summary
AI-generatedThis application proposes amendments to a previously permitted apartment block and basement at Thornhill House. The changes would increase the number of apartments from 33 to 39 units. No works are proposed to Thornhill House itself, which is a protected structure.
- Residential units
- 39
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 on a site of c. 1.39 ha to amend the apartment block and basement permitted under dun laoghaire rathdown county council reg. Ref. D17a/0240; an bord pleanála ref. Pl06d. 300244. No works are proposed to thornhill house, a protected structure (rps no. 936), under this planning application. The proposed development provides for amendments to the permitted apartment block comprising 33 no. Units (3 no. 1 bed, 24 no. 2 bed and 6 no. 3 bed units) to now comprise 39 no. Un...
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.
Built — construction complete
A commencement notice records works starting on 31 August 2020. A completion certificate was lodged on 28 May 2023.
Notified floor area: 6,080 m²
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 61 The Stables, Thornhill Oaks, Mount Merrionprice excludes VAT | Aug 2025 | €889,868 | 19 m |
| Apt.28 - Thornhill Oaks, Cherry Garth - Mount Merrion, Blackrock | Jul 2025 | €999,999 | 43 m |
| 50 Thornhill Oaks, Cherry Garth, Mount Merrion | Sept 2025 | €1,500,000 | 51 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrion | Dec 2025 | €1,430,135 | 56 m |
| 63 Thornhill Oaks, Blackrock, Co. Dublin | May 2026 | €870,000 | 59 m |
| Thornhill, Cherry Garth, Mount Merrion | Aug 2025 | €1,750,000 | 59 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrionprice excludes VAT | Jan 2025 | €1,145,374 | 64 m |
| 62 Thornhill Oaks, Blackrock, Co. Dublinprice excludes VAT | Mar 2026 | €859,031 | 71 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 received8 October 2019
- Decision issued2 December 2019
- Appeal submitted6 January 2020
- Appeal decided24 February 2020
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 comprises of 47 no. dwellings provided as follows; 33…
Thornhill House, Cherrygarth, Mount Merrion, Blackrock, Co. Dublin
D17A/0240Dún Laoghaire–RathdownLodged 26 Sept 2017Apartments
- 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/C11Dún Laoghaire–RathdownLodged 14 Jul 2023Alterations
- Compliance submissionAt this site
Compliance with Condition no. 7 of Reg Ref no. 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/C12Dún Laoghaire–RathdownLodged 4 Dec 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
- Awaiting decisionAt this site
Compliance with Condition no.9 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/C5Dún Laoghaire–RathdownLodged 10 May 2023Other
- 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/C8Dún Laoghaire–RathdownLodged 23 Jun 2023Other
- Compliance submissionAt this site
Compliance with Condition no.12 of Reg Ref no. ABP-31028521 (D21A/0161) (N&N)
Site of c. 1.39 ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co.Dublin A Protected Structure (RPS No. 936)
D21A/0161/C4Dún Laoghaire–RathdownLodged 4 Apr 2023Other
- 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
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