21 St Thomas Road, Mount Merrion, Co Dublin
Demolition of a detached garage and construction of a 151-square-metre single-storey extension.
D13B/0074 · Dun Laoghaire Rathdown County Council · Lodged 6 March 2013
- Reference
- D13B/0074
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 6 March 2013
Summary
AI-generatedThe development consists of works to an existing house, including the demolition of a detached garage. A new single-storey extension of 151 square metres will be built to the rear and side, alongside internal alterations and landscaping.
- Floor area
- 151 m²
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 consisting of works to existing house in particular the demolition of detached garage and the construction of a single-storey extension totalling 151 m2 to the rear and side of the existing structure, together with internal alterations to existing and including ancillary landscaping works.
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 15 April 2014.
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 14 St Thomas Road, Mount Merrion, Blackrock | Jul 2025 | €1,750,000 | 69 m |
| 12 Foster Ave, Mt Merrion, Dublin | Oct 2025 | €1,410,000 | 139 m |
| Apartments 1-11, Fitzwilliam Court, The Rise Mount Merrion | Dec 2025 | €4,400,000 | 174 m |
| 32 St Thomas Rd, Mount Merrion, Dublin | Mar 2025 | €1,900,000 | 174 m |
| Apartment 4 Greygates, Roebuck Ave, Mount Merrionprice excludes VAT | Jan 2026 | €190,000 | 217 m |
| 5 Greygates, Stillorgan Road, Mount Merrion | Jun 2025 | €1,690,000 | 254 m |
| Apt 100, Belfield Park, Stillorgan Road | Jan 2026 | €465,000 | 304 m |
| 33 North Avenue, Mount Merrion, Blackrock | Sept 2025 | €2,365,000 | 319 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 received6 March 2013
- Decision issued29 April 2013
- Appeal submitted27 May 2013
- Appeal decided30 September 2013
In the area
Applications near this site
Other planning applications within about 500 m — what else is being proposed or built nearby.
- Not exempt — permission neededAt this site
Element A — Replacement of existing Dormer window structure Element B
23 St Thomas' Road, Mount Merrion, Blackrock, Co.Dublin, A94H778
REF7224Dún Laoghaire–RathdownLodged 9 Jul 2024Alterations
- Granted30 m away
Planning Permission is sought by the applicants for widening of existing vehicular entrance gate with 2no.…
23, St. Thomas Road, Mount Merrion, Blackrock, Co. Dublin, A94H778
D24A/0674Dún Laoghaire–RathdownLodged 30 Aug 2024Alterations
- Granted50 m away
Second storey extension over existing single storey (reconstructed) to side, new porch to front, new sun room…
25 St. Thomas Road, Mount Merrion, Co Dublin.
D07B/0951Dún Laoghaire–RathdownLodged 26 Nov 2007Extension
- Granted50 m away
The proposed development shall consist of — Alterations to existing vehicular entrance to increase in width…
3, The Foster's, Mount Merrion, Dublin, A94TK64
D26A/0035/WEBDún Laoghaire–RathdownLodged 23 Jan 2026Extension
- Granted50 m away
Permission for — Demolition of a single-storey domestic store/garage building and a rear ground floor…
2 The Fosters, Fosters Avenue, Mount Merrion, Co Dublin
D15B/0206Dún Laoghaire–RathdownLodged 2 Jun 2015Extension
- Granted60 m away
The demolition of the existing conservatory to the rear (16m2) and alterations to the interior ground and…
4, The Fosters, Mount Merrion, Co. Dublin
D06B/0756Dún Laoghaire–RathdownLodged 21 Aug 2006Extension
- Granted70 m away
Permission for first floor extension and extended dormer roof and gable to north east side of existing house,…
13 Saint Thomas Road, Mount Merrion, Blackrock, Co Dublin
D19B/0080Dún Laoghaire–RathdownLodged 15 Feb 2019Extension
- Granted80 m away
Redevelopment of existing 2 storey 3 bedroom semi-detached house. Works to include the demolition of existing…
14, Saint Thomas Road, Mount Merrion, Blackrock, Co. Dublin, A94 AE89
D25B/0626/WEBDún Laoghaire–RathdownLodged 6 Nov 2025Extension
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