12 Northumberland Avenue, Dún Laoghaire, Co Dublin
Conversion and extension of a three-storey office building into seven apartments.
D19A/0152 · Dun Laoghaire Rathdown County Council · Lodged 1 March 2019
- Reference
- D19A/0152
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 1 March 2019
Summary
AI-generatedThe project involves a change of use from office to residential for an existing three-storey building to accommodate six 1-bedroom apartments. It also includes constructing a rear extension to create a part 4-storey building for a penthouse studio apartment.
- Residential units
- 7
- Storeys
- 4
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 the change of use, refurbishment and extensions to the existing building to accommodate a residential development of 7 no. Apartments. The development will include: change of use of existing 3-storey building from office to residential to accommodate 6 no. 1-bedroom apartments with associated alterations to internal layouts and external façade: construction of extension over art of the building to the rear creating a part 4-storey building to accommodate penthouse studio apart...
Built & 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 1 December 2020. A completion certificate was lodged on 3 June 2022.
Notified floor area: 385 m²
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 15 Northumberland Ave, Dun Laoghaire, Dublin | May 2025 | €1,250,000 | 45 m |
| 8 Northumberland Ave, Dun Laoghaire, Dublin | Feb 2025 | €1,100,000 | 52 m |
| 21a Mulgrave St, Dun Laoghaire, Dublin | Feb 2026 | €840,000 | 76 m |
| 34 Northumberland Avenue, Dunlaoughaira, Co Dublin | Dec 2025 | €1,900,000 | 88 m |
| 63 Mulgrave Street, Dun Laoghaire, Co. Dublin | Oct 2025 | €765,000 | 90 m |
| 30 Mulgrave St, Dun Laoghaire, Dublin | Nov 2025 | €1,800,000 | 97 m |
| 32 Mulgrave St, Dun Laoghaire, Dublin | Jul 2025 | €880,000 | 111 m |
| The Coach House, Sydenham Mews, Corrig Avenue | Jan 2026 | €750,000 | 111 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 received1 March 2019
- Decision issued25 April 2019
- Appeal submitted13 May 2019
- Appeal decided22 October 2019
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