12A, Northumberland Avenue, Dun Laoghaire, Dublin, A96HY76
Conversion of a one-bedroom house into a two-bedroom house with a two-storey rear extension and a dormer attic conversion.
D23B/0164 · Dun Laoghaire Rathdown County Council · Lodged 11 April 2023
- Reference
- D23B/0164
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 11 April 2023
Summary
AI-generatedThe project involves converting an existing 63sqm one-bedroom house into a larger 100sqm two-bedroom home. This will be achieved by building a two-storey extension at the rear and a dormer attic conversion to the front, including all associated site works.
- Storeys
- 2
- Floor area
- 100 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
Conversion of the existing 63sqm 1-bedroom house into a 100sqm 2-bedroom house via the construction of a 2-storey rear extension and dormer attic conversion to the front, along with associated 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 Northumberland Ave, Dun Laoghaire, Dublin | May 2025 | €1,250,000 | 43 m |
| 8 Northumberland Ave, Dun Laoghaire, Dublin | Feb 2025 | €1,100,000 | 62 m |
| 21a Mulgrave St, Dun Laoghaire, Dublin | Feb 2026 | €840,000 | 68 m |
| 30 Mulgrave St, Dun Laoghaire, Dublin | Nov 2025 | €1,800,000 | 85 m |
| 34 Northumberland Avenue, Dunlaoughaira, Co Dublin | Dec 2025 | €1,900,000 | 89 m |
| 63 Mulgrave Street, Dun Laoghaire, Co. Dublin | Oct 2025 | €765,000 | 94 m |
| 32 Mulgrave St, Dun Laoghaire, Dublin | Jul 2025 | €880,000 | 99 m |
| 85/86 Patrick Street, Dun Laoghaire, Co. Dublin | Mar 2025 | €417,500 | 112 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 received11 April 2023
- Decision due2 June 2023
- Decision issued26 April 2023
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 demolition of no 12B Northumberland Avenue, together with demolition and rebuilding in new…
12B Northumberland Avenue & Northumberland Hall, Northumberland Avenue, Dun Laoghaire, Co Dublin
D13A/0072Dún Laoghaire–RathdownLodged 15 Feb 2013Demolition
- RefusedAt this site
Permission is sought for the conversion of the existing 63 SqM 1-bedroom house into a 100 SqM 2-bedroom house…
12A, Northumberland Avenue, Dun Laoghaire, Dublin, A96HY76
D23B/0296Dún Laoghaire–RathdownLodged 20 Jun 2023Extension
- RefusedAt this site
Permission is sought for the conversion of the existing 63 sqm 1 bedroom house into a 119 sqm 3-bedroom house…
12A, Northumberland Avenue, Dun Laoghaire, Co Dublin
D21B/0252Dún Laoghaire–RathdownLodged 21 May 2021Extension
- GrantedAt this site
Permission for the Change of Use, refurbishment and extensions to the existing building to accommodate a…
12 Northumberland Avenue, Dún Laoghaire, Co Dublin
D19A/0152Dún Laoghaire–RathdownLodged 1 Mar 2019Apartments
- GrantedAt this site
Retention of development to include — steel structures, balustrades and cladding to rear balcony
12 Northumberland Avenue, Dun Laoghaire, Dublin,
D23A/0347Dún Laoghaire–RathdownLodged 24 May 2023Retention
- Granted30 m away
For the demolition of the existing kitchen and utility room and the construction of a new two storey…
14, Northumberland Avenue, Dun Laoghaire, Co. Dublin
D05B/0880Dún Laoghaire–RathdownLodged 6 Dec 2005Extension
- Refused30 m away
New two storey four bedroom mews house with garage using existing vehicular access to the rear. The floor…
14, Northumberland Avenue, Dun Laoghaire, Co. Dublin
D05A/0652Dún Laoghaire–RathdownLodged 25 May 2005New dwelling
- Granted30 m away
Permission for Change of Use from office use to a single residential dwelling
11 Northumberland Avenue, Dún Laoghaire, Co Dublin
D15A/0650Dún Laoghaire–RathdownLodged 12 Oct 2015Change of use
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
(1) Construction of single storey kitchen/dining/living room to rear; (2) conversion of existing attic to 2…
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SD18B/0399South DublinLodged 27 Sept 2018
- InvalidExtension
Single storey extension to rear of dwelling, two storey extension to side and conversion of attic to…
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WEB1810/24Dublin CityLodged 5 Jul 2024
- GrantedExtension
Single storey extension to the front, single and two storey extension to the rear. Conversion of attic space…
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3137/24Dublin CityLodged 2 Feb 2024
- InvalidExtension
Construction of part 2-storey / part single storey extension to rear of existing dwelling, Attic conversion…
54, Crumlin Road, Crumlin, Dublin 12
WEB1642/20Dublin CityLodged 22 Sept 2020
- GrantedExtension
Construction of two storey extension (55sq.m) with dormer windows to the side of existing dwelling; internal…
Ber Ranch, off Main Street, Saggart, Co. Dublin
SD19B/0405South DublinLodged 26 Feb 2020
- GrantedExtension
Single storey kitchen extension to rear, attic conversion with dormer windows to front and rear consisting of…
73, Monastery Walk, Dublin 22
SD18B/0003South DublinLodged 2 Jan 2018
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