5, Thornhill Road, Mount Merrion, Co. Dublin
Demolition of a side garage and construction of a two-storey side extension and single-storey rear extension.
D09A/0672 · Dun Laoghaire Rathdown County Council · Lodged 19 November 2009
- Reference
- D09A/0672
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 19 November 2009
Summary
AI-generatedThe development consists of demolishing the existing ground floor garage and side extension. In its place, a new two-storey side extension and a single-storey flat-roofed rear extension will be built, alongside a new front bay window and widened entrance.
- Floor area
- 115 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 is being sought for the demolition of the existing ground floor garage and single storey extension to the side of the existing single family dwelling unit and the construction of a new two-storey pitched roof extension to the side and single storey flat roofed extension to the rear (having a floor area of 113.0sq. M); the construction of a new ground floor bay window to the living room at the front of the house (having a floor area of 2.2sq. M); the widening of the existing front ent...
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 |
|---|---|---|---|
| 28 South Ave, Mount Merrion, Dublin | Sept 2025 | €1,400,000 | 58 m |
| 24 South Ave, Mount Merrion, Dublin | Dec 2025 | €1,580,000 | 59 m |
| 33 Clonmore Rd, Mount Merrion, Dublin | Apr 2026 | €1,425,000 | 63 m |
| 32 South Ave, Mount Merrion, Dublin | Jan 2026 | €1,725,000 | 68 m |
| 14 South Avenue, Mount Merrion, Co Dublin | Sept 2025 | €920,000 | 119 m |
| Thornhill, Cherry Garth, Mount Merrion | Aug 2025 | €1,750,000 | 157 m |
| 49 Thornhill Oaks, Cherry Garth, Mount Merrionprice excludes VAT | Jan 2025 | €1,145,374 | 161 m |
| 62 Thornhill Oaks, Blackrock, Co. Dublinprice excludes VAT | Mar 2026 | €859,031 | 168 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 received19 November 2009
- Decision issued10 December 2009
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 domestic extension and alterations to existing semi-detached dwelling. The extension and…
3, Thornhill Road, Mount Merrion, Co. Dublin
D18B/0168Dún Laoghaire–RathdownLodged 11 Apr 2018Extension
- GrantedAt this site
The development will consist of the demolition of the existing garage, various outhouses and the removal of…
7, Thornhill Road, Mount Merrion, Blackrock, County Dublin, A94D1WS
D21A/0635Dún Laoghaire–RathdownLodged 7 Jul 2021Extension
- Granted40 m away
Single storey extension to side and rear of existing residence with new porch and associated works.…
13 Thornhill Road, Mount Merrion, Co. Dublin.
D02B/0091Dún Laoghaire–RathdownLodged 1 Mar 2002Extension
- Refused40 m away
For the demolition of 2 no. garages (one each at Nos. 33 and 35 Clonmore Road), and a glass house and…
Rear lands No. 33 & No. 35 Clonmore Road, Mount Merrion, Co. Dublin
D26A/0295Dún Laoghaire–RathdownLodged 16 Apr 2026Housing estate
- Granted50 m away
Demolition of existing single storey extension to front, side and rear. Construction of new single storey…
15 Thornhill Road, Mount Merrion, Co. Dublin.
D02B/0895Dún Laoghaire–RathdownLodged 4 Dec 2002Extension
- Granted50 m away
For demolition of existing single storey garage to side and single storey
12, Thornhill Road, Mount Merrion, Co. Dublin
D07B/0719Dún Laoghaire–RathdownLodged 7 Aug 2007Extension
- Granted50 m away
Raising pitched roof of existing extension to front. Alterations to front elevation including tyrolene…
15 Thornhill Road, Mount Merrion, Co. Dublin.
D02B/0436Dún Laoghaire–RathdownLodged 11 Jun 2002Extension
- Granted60 m away
Permission for development at this site. The development will consist of the demolition of existing single…
30, South Avenue, Mount Merrion, Co. Dublin
D16B/0337Dún Laoghaire–RathdownLodged 3 Aug 2016Extension
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 is sought for alterations and extensions to existing dwelling comprising: the demolition of the…
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D14B/0146Dún Laoghaire–RathdownLodged 29 Jul 2014
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D18B/0434Dún Laoghaire–RathdownLodged 8 Oct 2018
- GrantedExtension
Permission is sought for (a) the demolition of existing garage/outhouses to the side, the (partial)…
17, North Avenue, Mount Merrion, Co. Dublin
D17A/0278Dún Laoghaire–RathdownLodged 29 Mar 2017
- RefusedExtension
Permission is sought for the demolition of existing garage and single storey accomodation to the side and to…
24, Maple Road, Clonskeagh, Dublin 14
D06B/1027Dún Laoghaire–RathdownLodged 27 Nov 2006
- WithdrawnExtension
Permission is sought for demolition of garage, play room, utility and WC at side and rear of existing house…
44, Waltham Terrace, Blackrock, Co. Dublin
D12A/0077Dún Laoghaire–RathdownLodged 2 Mar 2012
- GrantedExtension
Permission for extension and alterations to existing dwelling, consisting of the demolition of existing 14…
54 Mount Carmel Road, Goatstown, Dublin 14
D15A/0041Dún Laoghaire–RathdownLodged 28 Jan 2015
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