42, Sydney Avenue, Blackrock, Co. Dublin, A94D8P6
Demolition of a rear conservatory and construction of a new single-storey rear extension and attic dormer window.
D25A/0620/WEB · Dun Laoghaire Rathdown County Council · Lodged 7 August 2025
- Reference
- D25A/0620/WEB
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 7 August 2025
Summary
AI-generatedThe project at 42 Sydney Avenue includes widening the existing front vehicular entrance. It also features a new side window, a new roof light to the rear return, and an enlarged roof light over the stairs.
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
Application for development consisting of the demolition and removal of existing conservatory to the rear at ground floor level, construction of a new single storey extension to the rear, new window ope. To the side at ground floor level, new roof light to roof of existing single storey return to the rear, at first floor attic level new dormer window to existing bathroom to the rear and increasing the size of existing roof light over stairs and widening of the existing vehicular entrance to front garden along with ancillary site 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.
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 15 Brooklawn, Mount Merrion Ave, Blackrock | Mar 2025 | €875,000 | 39 m |
| 2 Sydney Mews, Sydney Avenue, Blackrock | Jun 2025 | €1,300,000 | 64 m |
| 43 Mount Merrion Ave, Blackrock, Dublin | Feb 2025 | €865,000 | 144 m |
| 61 Woodview Apts Block E, Mount Merrion Avenue, Blackrock | May 2025 | €750,000 | 146 m |
| 73 Woodview, Mount Merrion Ave, Blackrock Dublin 4 | Mar 2026 | €791,000 | 146 m |
| 58 Woodview, Mount Merrion Avenue, Co Dublin | Jul 2025 | €760,000 | 146 m |
| 69 Woodview, Mount Merrion Ave, Blackrock | Apr 2025 | €685,600 | 164 m |
| 35 Woodview, Mount Merrion Ave, Blackrock | Sept 2025 | €580,000 | 172 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 received7 August 2025
- Decision due1 October 2025
- Decision issued29 September 2025
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
Alterations to railings to form vehicular gateway and car space in front garden
46, Sydney Avenue, Blackrock, Dublin
D08A/0598Dún Laoghaire–RathdownLodged 23 May 2008Alterations
- GrantedAt this site
Permission for construction of a single storey extension at first floor over existing garage to the side
36 Sydney Avenue, Blackrock, Co Dublin
D15B/0074Dún Laoghaire–RathdownLodged 13 Mar 2015Extension
- Compliance submissionAt this site
Compliance with Condition No.2 of Reg Ref No. D25A/1002/WEB
48, Sydney Avenue, Blackrock, Dublin, A94D2T0
D25A/1002/WEB/C1Dún Laoghaire–RathdownLodged 6 May 2026Other
- Awaiting decisionAt this site
Compliance with Condition No.2 of Reg Ref No. D25A/1002/WEB
48, Sydney Avenue, Blackrock, Dublin, A94D2T0
D25A/1002/WEB/C2Dún Laoghaire–RathdownLodged 14 Jul 2026Other
- GrantedAt this site
The development will consist of the following — Retention permission for removal of section of front boundary…
48, Sydney Avenue, Blackrock, Dublin, A94D2T0
D25A/1002/WEBDún Laoghaire–RathdownLodged 23 Dec 2025Retention
- Granted40 m away
Alterations and extensions to house including dormer window in rear main roof; high level window in gable at…
52, Sydney Avenue, Blackrock, Co. Dublin
D05A/0199Dún Laoghaire–RathdownLodged 6 May 2005Extension
- Granted40 m away
For the erection of (1) A single storey extension of 19.5 sq.m. for use as a kitchen (2) A first floor…
14, Brooklawn, Mount Merrion Avenue, Blackrock, Co. Dublin
D06B/0832Dún Laoghaire–RathdownLodged 13 Sept 2006Extension
- Granted50 m away
Permission for extensions and alterations to existing dwelling totalling 79.05 sqm. The works include — Two…
20 Brooklawn, Blackrock, Co Dublin
D18B/0454Dún Laoghaire–RathdownLodged 28 Dec 2018Extension
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: Demolition of the existing…
117, Stepaside Park, Stepaside, Dublin 18, D18Y335
D21A/0209Dún Laoghaire–RathdownLodged 15 Mar 2021
- GrantedExtension
For development consisting of demolition of existing conservatory, utility and boiler room to rear. New two…
Laragh, 2, Newtownpark Avenue, Blackrock, Co. Dublin
D06A/1506Dún Laoghaire–RathdownLodged 21 Dec 2006
- GrantedExtension
Demolition of existing conservatory to rear; construction of single storey extension to rear with flat roof…
34, Marian Crescent, Dublin 14
SD20B/0529South DublinLodged 22 Dec 2020
- GrantedExtension
The development will consist of the following: (a) The demolition of the existing rear conservatory. (b) The…
36, Springhill Avenue, Blackrock, Co. Dublin, A94PX28
D25B/0682/WEBDún Laoghaire–RathdownLodged 8 Dec 2025
- Awaiting decisionExtension
The development will consist of extension to existing structure, located to the front and side comprising:…
59, Abbeyfield, Killester, Dublin 5
4019/18Dublin CityLodged 25 Sept 2018
- InvalidExtension
The proposed development comprises Demolition of existing single storey conservatory to rear (south) of…
88, Grattan Lodge, Hole in the Wall Road, Dublin, D13 HD51
WEB1035/19Dublin CityLodged 29 Jan 2019
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