Rear and side of, 22, St. Thomas Road, Mount Merrion, Blackrock, Co Dublin
Demolition of a granny flat and garage to build a new two-storey side and rear extension.
D20A/0665 · Dun Laoghaire Rathdown County Council · Lodged 18 September 2020
- Reference
- D20A/0665
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 18 September 2020
Summary
AI-generatedThe project involves the demolition of an existing rear granny flat, conservatory, and parts of a side garage and chimney. A new two-storey extension will be constructed to the side and rear, along with a ground floor rear extension and front bay window.
- 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
Permission for development. The development will consist of alterations to existing 2 storey dwelling to include, demolition of existing rear ground floor granny flat and conservatory and partial demolition of side garage and chimney to roof and the proposed construction of a new two storey extension to the side and rear of the house and associated roof alterations, a ground floor extension to rear of house, alterations to existing window and door opes to front elevation , a new 1 storey bay...
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 8 April 2021.
Notified floor area: 366 m²
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 14 St Thomas Road, Mount Merrion, Blackrock | Jul 2025 | €1,750,000 | 48 m |
| 32 St Thomas Rd, Mount Merrion, Dublin | Mar 2025 | €1,900,000 | 92 m |
| 33 North Avenue, Mount Merrion, Blackrock | Sept 2025 | €2,365,000 | 215 m |
| Apartments 1-11, Fitzwilliam Court, The Rise Mount Merrion | Dec 2025 | €4,400,000 | 236 m |
| 12 Foster Ave, Mt Merrion, Dublin | Oct 2025 | €1,410,000 | 246 m |
| 5 Greygates, Stillorgan Road, Mount Merrion | Jun 2025 | €1,690,000 | 262 m |
| Apartment 4 Greygates, Roebuck Ave, Mount Merrionprice excludes VAT | Jan 2026 | €190,000 | 269 m |
| 14 Mather Rd North, Mount Merrion, Dublin | Jan 2026 | €1,845,000 | 283 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 received18 September 2020
- Decision issued10 November 2020
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
Permission for: (a) Single storey extension to rear (24 sqm) with slate finish roof and feature roof glazing.…
20, Saint Thomas Road, Mount Merrion, Co. Dublin
D14B/0140Dún Laoghaire–RathdownLodged 2 Jul 2014Extension
- GrantedAt this site
Alterations, demolition of existing garage, extension to the side and widening of the existing entrance.…
24 St Thomas Road, Mount Merrion, Co. Dublin.
D02A/0026Dún Laoghaire–RathdownLodged 21 Jan 2002Extension
- Granted50 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
- Refused50 m away
Demolition of existing detached two-storey dwelling and the construction of a new detached single family,…
'Hillberry', 28, St. Thomas Road, Blackrock.
D03A/0514Dún Laoghaire–RathdownLodged 27 May 2003New dwelling
- Granted60 m away
8 sq.m extension to the existing domestic dwelling at first floor to contain an ensuite bathroom serving…
"Hillberry", 28, Saint Thomas Road, Mount Merrion, Co. Dublin
D08B/0389Dún Laoghaire–RathdownLodged 23 May 2008Extension
- Granted70 m away
For demolition of an existing single storey domestic extension and and construction of a replacement single…
11, Iris Grove, Mount Merrion, Co. Dublin
D06B/1096Dún Laoghaire–RathdownLodged 15 Dec 2006Extension
- Granted70 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
- Granted80 m away
Demolition of existing detached two-storey dwelling house. Construction of two-storey detached replacement…
32, Saint Thomas Road, Mount Merrion, Dublin, A94F973
D23A/0741Dún Laoghaire–RathdownLodged 23 Nov 2023New dwelling
Related developments
Similar applications
Ranked by what these developments actually propose, not by matching words — so you can see how comparable applications were decided.
- GrantedExtension
Permission for development at this site. The development will consist of: (1) Demolition of the existing shed…
66, Ailesbury Grove, Dundrum, Dublin 16, D16 EK10
D22A/0556Dún Laoghaire–RathdownLodged 28 Sept 2022
- RefusedExtension
Permission for the demolition of an existing garage and porch, construction of a two storey side extension,…
Rathvoy House , Scart Road , Castletreasure
2139920Cork CityLodged 16 Feb 2021
- GrantedExtension
Permission for the demolition of existing single storey granny flat attached to existing dwelling and rear…
29 Callary Road, Mount Merrion, Blackrock, Co Dublin A94 N9F5
D18B/0559Dún Laoghaire–RathdownLodged 20 Dec 2018
- GrantedExtension
Permission for — Demolition of single storey garage to side
8 Brookville Park, Blackrock, Co. Dublin A94D322
D19A/0928Dún Laoghaire–RathdownLodged 30 Jan 2020
- InvalidExtension
Permission for the following: Demolition of existing side single storey section of house and storage shed to…
18 Seafield Road, Blackrock, Dublin A94 R960
D19A/1028Dún Laoghaire–RathdownLodged 24 Dec 2019
- GrantedExtension
Permission for: A. Demolition of existing conservatory to rear and construction of 25.2 sqm new single storey…
38 Shrewsbury Lawn, Cabinteely, Dublin 18
D17B/0034Dún Laoghaire–RathdownLodged 10 Apr 2017
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