Knocknagow House, Greenville Road, Blackrock, Co Dublin
Low energy retrofit, alterations, and a two-storey side extension to an existing house.
D14B/0255 · Dun Laoghaire Rathdown County Council · Lodged 15 July 2014
- Reference
- D14B/0255
- Authority
- Dun Laoghaire Rathdown County Council
- Register status
- Decided
- Type
- Permission
- Received
- 15 July 2014
Summary
AI-generatedThe project involves a low energy retrofit and alterations, including the demolition of an existing two-storey side extension and entrance lobby. A new two-storey side extension with a south-facing balcony will be constructed, alongside a new pitched roof to match the main house.
- 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 the proposed low energy retrofit, alterations and extension (with pedestrian access to rear from montpelier mews lane). The development will consist of; the demolition of existing 2 storey side extension, entrance lobby and some internal walls; new roof to the existing single storey cottage, conversion of existing flat roof on main house to be pitched to match into existing main roof; construction of a new 2 storey extension to the side of the house with south facing balcony/s...
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 20 May 2015. A completion certificate was lodged on 30 May 2016.
Recent sales nearby
within 500 m| Address | Date | Price | Distance |
|---|---|---|---|
| 47 Montpelier Parade, Monkstown, Dublin | Mar 2026 | €1,795,000 | 84 m |
| 29 Eaton Sq, Monkstown, Dublin | Jan 2026 | €2,400,000 | 111 m |
| 4 Queens Park, Monkstown, Co Dublin | Jun 2026 | €3,875,000 | 128 m |
| 2 Greenville Court, Stradbrook Rd, Blackrock | Sept 2025 | €417,000 | 142 m |
| 28 Stradbrook Park, Blackrock, Dublin | Mar 2025 | €657,000 | 144 m |
| 14 Verona, Queenspark, Monkstown Rd | Jun 2026 | €690,000 | 147 m |
| 13 Eaton Sq, Monkstown, Dublin | Nov 2025 | €2,000,000 | 174 m |
| 15 Eaton Sq, Monkstown, Dublin | Feb 2026 | €2,600,000 | 189 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 received15 July 2014
- Decision issued5 September 2014
- Appeal submitted1 October 2014
- Appeal decided11 February 2015
In the area
Applications near this site
Other planning applications within about 500 m — what else is being proposed or built nearby.
- RefusedAt this site
Demolition of existing dwelling and the construction of 3 no. 2 storey townhouses with car parking on…
Montpelier Cottage, Montpelier Parade, Monkstown, Co. Dublin
D05A/1510Dún Laoghaire–RathdownLodged 24 Nov 2005Housing estate
- RefusedAt this site
Planning permission is sought for the change of use from home office to one bed studio apartment for a family…
Montpelier Cottage, Montpelier Lane, Monkstown, Blackrock, Dublin, A94P7X3
D25A/0558/WEBDún Laoghaire–RathdownLodged 14 Jul 2025Change of use
- InvalidAt this site
Planning permission is sought for the change of use from home office to one bed studio apartment for a family…
Montpelier Cottage, Montpelier Lane, Monkstown, Dublin, A94P7X3
D25A/0551/WEBDún Laoghaire–RathdownLodged 9 Jul 2025Change of use
- RefusedAt this site
Permission for development. The development will consist / consists of: planning permission is sought for 2…
To the rear of protected structure, Montpellier Cottage, Montpelier Laneway, Monkstown, Co. Dublin
D20A/0865Dún Laoghaire–RathdownLodged 24 Nov 2020Alterations
- RefusedAt this site
Permission for development at this site. Permission is sought for the installation of 8 no. bicycle storage…
The side of protected structure, Montpellier Cottage, Montpellier Laneway, Monkstown, Co. Dublin
D21A/0133Dún Laoghaire–RathdownLodged 18 Feb 2021Alterations
- GrantedAt this site
Permission is sought for the demolition of front, sides and rear flat and pitched roof single storey…
Montpellier Cottage, Montpellier Parade, Monkstown, Co. Dublin.
D10B/0139Dún Laoghaire–RathdownLodged 8 Apr 2010Extension
- GrantedAt this site
Single storey pitched roof extension to the East, South and West elevations including glazed roof section to…
Montpelier Cottage, Montepelier Parade, Monkstown,, Co. Dublin.
D07B/0784Dún Laoghaire–RathdownLodged 31 Aug 2007Extension
- RefusedAt this site
Permission for development at this site. The development will consist/consists of: planning permission is…
To the rear of a protected structure, Montpellier Cottage, Montpellier Laneway, Monkstown, Co. Dublin
D20A/0506Dún Laoghaire–RathdownLodged 21 Jul 2020Other
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. The development will consist of an energy-efficient retrofit of the existing…
20, Granville Road, Cabinteely, Dublin 18
D13A/0595Dún Laoghaire–RathdownLodged 11 Mar 2014
- WithdrawnExtension
Permission for development consisting of an energy-efficient retrofit of the existing single storey…
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D13A/0360Dún Laoghaire–RathdownLodged 12 Jul 2013
- GrantedExtension
Permission is sought for development consisting of — demolition of existing entrance Porch
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D22A/0968Dún Laoghaire–RathdownLodged 6 Dec 2022
- GrantedExtension
Permission for removal of existing flat-roofed single storey extension to front; reconfiguration of existing…
46 Carysfort Avenue, Blackrock, Co Dublin
D18B/0139Dún Laoghaire–RathdownLodged 22 Mar 2018
- GrantedExtension
Permission is sought for development consisting of demolition of an existing basement single storey extension…
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D15A/0793Dún Laoghaire–RathdownLodged 10 Dec 2015
- GrantedExtension
Planning permission is sought for the demolition of existing garage and stores to the side (West) and removal…
4, Knocksinna Court, Blackrock, Co. Dublin
D11A/0354Dún Laoghaire–RathdownLodged 28 Jul 2011
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