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Planning records

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D24B/0523/WEB

Altering/raising pitched roof, to existing first floor extension to the rear of the existing house, building up the rear external wall to incorporate window, to accommodate attic bedroom extension (within the altered/raised roof space), and, relocation/raising of existing first floor window to the side external wall of the existing house (in connection with the provision of staircase to attic bedroom).

48, The Rise, Mount Merrion, Blackrock, Co. Dublin, A94A3Y6Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused05 February 2025
D20B/0384

Permission is sought for the

48, The Rise, Mount Merrion, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted28 January 2021
D25A/0536/WEB

Single storey rear extension, alterations to the front façade, Velux type of windows to the front roof, Dormer type of window to the rear roof, widening existing vehicular access, some internal alterations and associated site works.

66, Dunaree, South Avenue, Mount Merrion, Co Dublin, A94 Y4C9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted22 August 2025
D26B/0099/WEB

Proposed construction of a single story extension to provide an accessible toilet and shower room, together with alterations to the existing porch and the addition of a new entrance canopy.

38, Stillorgan Road, Blackrock, Dublin, A94A2W2Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted10 April 2026
D23B/0349

Demolition of existing single storey extension to rear, construction of new single storey extension to rear, and for new/altered window/external door opes (at ground floor) to side, to existing (semi-detached) house.

5, Trees Road Lower, Mount Merrion, Blackrock, Dublin, A94XP97Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted11 September 2023
D24B/0192

Permission is sought for: 1. New Dormer window to rear of existing house. 2. All above with associated site works.

22, Trees Road Lower, Mount Merrion, Blackrock, Dublin, A94N7F4Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted17 June 2024
D22A/0956

Permission sought for demolition of existing garden screen wall, side wall of utility/storeroom structure, section of existing breakfast room wall & bedroom 3 for new window openings. New single storey bay window extension to existing living room & canopy roof over front door to front elevation. New side single storey extension & bay window to front to existing utility/store room to form bedroom and bathroom. New screen wall & relocated side gate. New single storey extension to rear elevation comprising of dining area/lounge on the ground floor. New window to existing breakfast room/new utility room on the ground floor, new window with obscure glass to new bathroom on 1st floor.

67, South Avenue, Mount Merrion, Dublin, A94 E2Y9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted01 February 2023
D22A/0084

Retention permission for the following:

Union Café and Kennedy's Public House, bounded by Deerpark Road, North Avenue and Wilson Road, Mount Merrion, Blackrock, Co. DublinDun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions0.3 km away
Granted29 March 2022
D21A/1112

Retention permission for the following: The temporary placement, for two years from date of application, of a converted ambulance vehicle and associated landscaping works in the existing car-park for the preparation and serving of hot food to be consumed within the site or taken away.

Union Café adn Kennedy's Public House, bounded by Deerpark Road, North Avenue and Wilson Road, Mount Merrion, Blackrock,Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted15 February 2022
D23B/0510

Dormer window extension at first floor level to the front of existing semi-detached dwelling and all associated ancillary works.

8, Sycamore Road, Mount Merrion, Blackrock, Dublin, A94A6P7Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted18 December 2023
V/070/25

1 dwelling

Rear of 75, Deerpark Road, Mount Merrion, Blackrock, DUBLIN, A94D984Dun Laoghaire Rathdown County CouncilCertificate of Exemption - Part V0 reasons0 conditions0.3 km away
Granted07 October 2025
D24A/0059

Redesign of the permitted no. 40 Thornhill Oaks (D20A/0432, ABP308150-20) to provide a part single/part two storey at this location. No works are proposed to Thornhill House, a Protected Structure (RPS 936).

Site at Thornhill Oaks, Mount Merrion, Blackrock, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused25 March 2024
D25A/0699/WEB

The proposed development will consist of: • New single storey detached dwelling to the rear of the existing property • Alterations to existing entrance from laneway to 3.0M in width • Creation of new pedestrian entrance from laneway • All associated alterations and demolitions, site, drainage, landscaping and ancillary works.

75 Deerpark Road, Mount Merrion, Co. Dublin, A94D984Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted12 March 2026
D23A/0428

Permission sought for change of use from domestic residential to short term lets residential

6, Sycamore Road, Mount Merrion, Blackrock, Dublin, A94C3H7Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused17 August 2023
D23B/0063

Retention of single storey garden studio with canopy over patio area (52.05m2 footprint)

6, Sycamore Road, Mount Merrion, Dublin, A94C3H7Dun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions0.3 km away
Granted13 April 2023
D21A/0946

Permission for development. The development will consist of

14 Trees Road Lower, Mount Merrion, Blackrock, Co. Dublin, A94 C1X2Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted15 December 2021
D24A/0131

A) Demolition of the existing rear extension and side garage. B) The construction of a 108sqm part two-storey, part single-storey extension to front, side and rear. C) Internal alterations, elevational modifications including roof mounted solar panels and general refurbishment. D) Widening of vehicular entrance to 3.6m. E) New patio to rear and associated site works & landscaping.

76, Trees Road Lower, Mount Merrion, Blackrock, Dublin, A94Y7A4Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted29 April 2024
D25A/0292/WEB

For development consisting of alteration and extension of existing 2-storey retail/office terraced building. Works to include extension of existing wine shop to provide new ground floor cafe/wine bar connected to the rear of the existing building. New storage areas at first floor connected to the existing raised yard to the rear of the site, and demolition & replacement of existing shed in the yard, opening onto the rear Mews lane. Renovation of existing front facade including new windows & doors, removal of paintwork from original brickwork, new signage, awning, lighting and associated site development works.

73, Deerpark Road, Mount Merrion, Co Dublin, A94C4E7Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted23 July 2025
D24A/0008

Demolition of the existing shed at 44A North Avenue (72.8sqm) and the development of three houses on the 0.1 hectare site (GFA 684 sqm) as follows: One ground floor over basement (two double bedrooms) dwelling with green roof on the site of 44A North Avenue, private amenity space to the side of the dwelling and one car parking space. A pair of semi detached two storey plus dormer dwellings (four double bedroom and study/home office) on the site to the rear of no.38 and no.38A Greenfield Road, each with private amenity space to the rear of the dwellings and two car parking spaces per house. All associated site development works including a new access road from North Avenue parallel to the existing row, boundary fencing, foul and surface water drainage, bicycle and bin storage and associated landscaping.

Lands to the rear of 38 & 38A Greenfield road (formerly side and rear of A94W2R6) and 44A North Avenue A94V9W3, Mount Merrion, Blackrock, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted21 May 2024
D22A/0430

Permission for development the development shall consist of the construction of a new three storey house over basement with second floor front patio balcony, ancillary site works, new drainage systems and new vehicular entrance.

44A and 44b North Avenue, Mount Merrion, Co Dublin, to the rear of 44a North Avenue, Mount Merrion, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused11 August 2022
D22A/0427

Permission for development shall consist of the construction of a new three storey house over basement with second floor front patio balcony, ancillary site works and new drainage systems. The subject site is located at the rear of 44a and 44b North Avenue, Mount Merrion, Co. Dublin and access is through this site by way of an existing vehicular entrance off North Avenue, Mount Merrion, Co. Dublin and a right of way over 44a and 44b North Avenue, Mount Merrion, Co. Dublin.

44C North Avenue, Mount Merrion, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused11 August 2022
D21A/0202

Permission is sought for amendments to the following two permissions (A) Register Reference D15A/0121: Reallocation of car parking spaces by providing 48 designated spaces for the 48 apartments, 20 spaces for 20 apartments un the adjoining Union site, the remaining 5 spaces for the set down/visitor spaces/car sharing facility, (b) Register Reference D17A/0951: The omission of the approved lower level of basement car-parking and access ramp thereto, containing 59 no. parking spaces, the relocation of the bin compounds from lower to upper level, and the reallocation of the remaining 60 no. spaces on the upper level by providing 30 no. spaces for 30 of the approved apartments and the remaining 25 spaces for the approved public house/restaurant, 5 spaces for visitor set down and car sharing and to provide an additional 38 no. bicycle spaces. The total underground parking provision for the overall site will be 133 no. spaces. A pedestrian link and staircase is to be constructed between the two car parking areas so that they operate as a singled managed unit.

Known as Flanagans, Deerpark Road (backing onto Wilson Road), Mount Merrion, Co. Dublin and, Union Café and Kennedy's Public House bounded by Deerpark Road, North Avenue and Wilson Road, Mount Merrion, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused29 April 2021
D26B/0196/WEB

The development will consist of: (i) demolition of the existing single-storey garage to the west (side) of the dwelling, together with the glazed sunroom and shed to the south (rear); (ii) construction of a single-storey pitched-roof porch to the north (front) elevation; (iii) construction of a single-storey flat roof extension to the west (side) and south (rear); (iv) construction of bay window extension with pitched roof to 1st floor level at south (rear) facade; (v) installation of Velux rooflights to the north (front) and west (side) roof slopes; (vi) reduction in size of a first-floor window to the west (side) elevation; (vii) formation of a 1-metre-wide side passage to provide rear access; and (viii) all associated site development and ancillary works.

18, Greenfield Road, Mount Merrion, Dublin, A94A0W7Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted25 May 2026
D20A/0445

Permission for works. The development will consist of

57 Cedarmount Road, Mount Merrion, County Dublin A94 X2F9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted30 September 2020
D19A/0753

Permission for an extension and refurbishment. The development will consist of the demolition of the existing garage, the removal of all existing windows, doors, the demolition of the chimney and some internal walls. We intend to erect a two storey extension to the side which reduces to a single storey extension towards the boundary of the property. The single storey extension will extend along the front elevation creating a new entrance porch. We will also create a new vehicular entrance, driveway and landscaping to the property.

57, Cedarmount Road, Mount Merrion, Co. Dublin, A94 X2F9Dun Laoghaire Rathdown County CouncilPermission0 reasons6 conditions0.3 km away
Granted02 January 2020
D25A/0906/WEB

A change of use into a dental practice, including associated signage and all related works, with independent ground-floor access.

69 Deerpark Road (first floor), Mount Merrion, Blackrock, County Dublin, A94E9D3Dun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions0.3 km away
Granted27 February 2026
D19A/0986

Permission for development. The development will consist of the installation of two security gates to the pedestrian entrances and an automatic sliding gate (with street number) to the vehicular entrance to the site. The gates will be fixed within existing openings between the brickwork piers to the front boundary on Road.

409 Stillorgan Road, Stillorgan, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused18 February 2020
D16A/0465/E

Permission for the demolition of the former Oatlands Monastery building (c.1,682 sqm) and other derelict buildings on the site (c.101 sqm), the demolition of the existing single storey dwelling at No. 2 Cherrygarth (c.157 sqm) and the construction of 63 residential units. The development will be accessed through a new entrance at No. 2 Cherrygarth. Residential development will comprise 9 houses, 24 duplexes and 30 apartments. These are broken down as follows: One 3-bed detached two-storey dwelling (c.8.3m in height) to replace the demolished dwelling at No. 2 Cherrygarth, 8 no. 2.5 storey 4/5 bed detached units (between c.9.9 - 10.13 metres in height), 12 no. 3-bed duplex units of 3 storeys (c.12.8 - 15.8 metres in height) with terraces and balconies on the north and south elevations, two apartment blocks of 4 storeys (c.13.5 metres in height) with 4 no. 1-bed units, 20 no. 2-bed units and 6 no. 3-bed units with balconies on the north, east and south elevations. The development will also include 18 on-curtilage car parking spaces associated with the detached dwelling units, 43 at-grade car parking spaces associated with the duplex units, 47 car parking spaces at basement level of the apartment block (c.1,808 sqm), 2,929 sqm of open space, including a children's play area and all associated site development works above and below ground, including site services.

Site of c.1.12ha at Oatlands Monastery, to the rear of Oatlands College, Mount Merrion, Blackrock, Co Dublin and at No. 2 Cherrygarth, Mount Merrion, Blackrock, Co DublinDun Laoghaire Rathdown County CouncilExtension Of Duration Of Permission0 reasons0 conditions0.3 km away
Granted17 June 2022
D21B/0401

Permission is sought for single storey

38 Greenfield Road, Mount Merrion, Blackrock, Co. Dublin, A94 W2R6Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted21 September 2021
D25B/0440/WEB

Planning Permission is sought for: Refurbishment of the existing house, with a new single-storey extension to the rear to accommodate a living, kitchen and dining area. Renovation works are to the ground floor and include; conversion of the garage into a utility space and playroom, a home office, and visitor WC. To the front elevation, the garage door is to be replaced by a new window. Works to include the demolition of the existing single-storey rear extension, selected windows and internal walls. Proposed works to also include thermal upgrades to the floor and walls, and all associated site works.

47, Cedarmount Road, Mount Merrion, Dublin, A94H5P8Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted12 September 2025
D21A/0753

Permission for development. The development will consist of alterations to the permitted residential development under Reg. Ref. D16A/0465; ABP Ref. PL 06D.247267 comprising revisions to the wastewater and surface water drainage proposals. The revised drainage route is to the south of the site with the wastewater proposed to discharge to the existing system in Woodlands Avenue with the surface water to discharge to the existing system in the old Dublin Road. The development will include all associated site development works to facilitate the proposed development.

C.1.2087 ha. site located at the Former Oatlands Monastery (A94 W7W7), to the rear of Oatlands College, Mount Merrion Co. Dublin and 2 Cherrygarth (A94 D5K3), Mount Merrion, Blackrock, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused18 October 2021
D25A/0628/WEB

Planning permission is sought for the change of use of the existing commercial unit. The proposed development will consist of the material change of use of the ground floor office unit 02 to a retail unit. Planning permission is also sought for connections to all other necessary site services and all ancillary works necessary to facilitate the change of use of the premises.

Unit 2,The Pinnacle, Deerpark Road, Mount Merrion, Blackrock, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted03 October 2025
D25A/0627/WEB

Planning permission is sought for the change of use of the existing commercial unit. The proposed development will consist of the material change of use of the ground floor office unit 01 to a retail unit. Planning permission is also sought for connections to all other necessary site services and all ancillary works necessary to facilitate the change of use of the premises.

Unit 1,The Pinnacle, Deerpark Road, Mount Merrion, Blackrock, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted03 October 2025
D24B/0345/WEB

Permission is sought for The conversion of existing attic space to new bedroom and ensuite with dormer window and roof light to rear and 2 No. Roof lights to front Elevation and all associated site works

48, Thornhill Oaks, Mount Merrion, Co. Dublin, A94 K0E7Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted19 September 2024
D25A/0630/WEB

Planning permission is sought for the change of use of the existing commercial unit. The proposed development will consist of the material change of use of the ground floor office unit 04 to a retail unit. Planning permission is also sought for connections to all other necessary site services and all ancillary works necessary to facilitate the change of use of the premises.

Unit 4, The Pinnacle, Deerpark Road, Mount Merrion, Blackrock, DUBLIN, A94V9X8Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted03 October 2025
D25A/0629/WEB

Planning permission is sought for the change of use of the existing commercial unit. The proposed development will consist of the material change of use of the ground floor office unit 03 to a retail unit. Planning permission is also sought for connections to all other necessary site services and all ancillary works necessary to facilitate the change of use of the premises.

Unit 3, The Pinnacle, Deerpark Road, Mount Merrion, Blackrock, DUBLIN, A94W2Y6Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted03 October 2025
D15A/0121/E

Permission for demolition of the furniture store and construction of a 5.214m2 mixed-use building of between three and six storeys with balconies and retractable awnings, over a basement car park for 92 cars, 48 bicycle spaces, 6 motorbike spaces, refuse storage and individual residents' storage rooms. The building will have 4 office units totalling 282m2 at ground floor level, 48 residential dwelling units (10 one-bed, 27 two-bed and 11 three-bed units) amenity space for residents and all ancillary site works to include boundary treatment, landscaping and plant at roof level. Vehicular access to be from Deerpark Road and non-vehicular access via an existing footpath from Wilson Road.

Site known as Flanagans, Deerpark Road (backing onto Wilson Road), Mount Merrion, Co DublinDun Laoghaire Rathdown County CouncilExtension Of Duration Of Permission0 reasons0 conditions0.3 km away
Granted21 July 2021
D24A/0234

Two storey with attic dormer, 4 bedroom detached dwelling incorporating alteration to existing driveway entrance to widen and provide seperate entrances to existing and proposed dwelling. The works include exempted development of part demolition of existing single storey extension to side of existing and minor alterations to the existing and all associated works.

86, Trees Road Lower, Mount Merrion, Blackrock, Dublin, A94V2A0Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted31 May 2024
D26A/0300/WEB

The development will consist of a two-storey over basement detached dwelling on a 0.045-hectare site. The accommodation includes (GFA. 345sqm): • Basement: home cinema, gym, games room, bathroom/ sauna and store. • Ground floor: kitchen/dining/ living, sitting room, home office, utility and boot room/guest WC. • First floor: three double ensuite bedrooms. The proposal also includes a new vehicular access from Greenfield Road, car parking, private amenity space to the rear (70sqm) and all associated site development works, including, foul and surface water drainage and landscaping.

38A Greenfield Road (to west side of 38 Balnagowan, Greenfield Road), Mount Merrion, Blackrock, A94W2R6Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted11 June 2026
D25A/0842/WEB

Two-storey over basement detached dwelling on a 0.045-hectare site. The accommodation includes (GFA 341.7sqm): 1) Basement: home cinema, gym, and playroom; 2) Ground floor: living room, kitchen/dining area, sitting room, office, and utility room; 3) First floor: three double ensuite bedrooms; 4) The proposal also includes a new vehicular access from Greenfield Road, two car parking spaces, private amenity space to the rear (124sqm) and all associated site development works, including, foul and surface water drainage and landscaping.

38A Greenfield Road (to west side of 38 Balnagowan, Greenfield Road), Mount Merrion, Blackrock, Co. Dublin A94W2R6Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Refused09 January 2026
V/080/25

1 dwelling

Site to the side of 38 Greenfield Road, Mount Merrion, Blackrock, Co. Dublin, A94W2R6Dun Laoghaire Rathdown County CouncilCertificate of Exemption - Part V0 reasons0 conditions0.3 km away
Granted11 November 2025
D24A/0146

Installation of telecommunications equipment including shrouded no. 3 ballast mounted antennas, no. 9 ballast mounted remote radio units (RRU's), dish, GPS, cable trays, outdoor light, cabinets and all other associated site development works on the building rooftop to provide for high-speed wireless data and broadband services.

The Pinnacle, Deerpark Road, Mount Merrion, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted01 May 2024
D22A/0141

Permission for the construction of 4 no. 2.5 storey

Northwest Corner of Wilson Road and North Avenue, Mount Merrion, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted20 April 2022
D24A/1036/WEB

Alterations to previously granted planning (under Reg. Ref D24A/0817/WEB) for development at 8 Greenfield Road, Mount Merrion, Blackrock, Co. Dublin, A94 D2E9. The proposed alterations will consist of a) additional 1.0m in depth to proposed rear extensions to ground and first floor, b) new flat-roof dormer window to rear of existing roof slope to facilitate attic conversion, c) changes to rooflights at attic level, and all associated site works.

8, Greenfield Road, Mount Merrion, Blackrock, Dublin, A94D2E9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted19 March 2025
D24A/0817/WEB

A) removal of existing single-storey extension, sheds and garage to side and rear of dwelling, and b) the construction of a two-storey, extension to side and rear of existing dwelling, with rooflights, c) single-storey extension to rear of dwelling, with rooflights, d) widening of existing vehicular entrance piers to 3.5m, and all associated site works.

8, Greenfield Road, Mount Merrion, Blackrock, Co. Dublin, A94 D2E9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.3 km away
Granted03 December 2024
D23A/0346

Removal of existing single storey extension to the rear, removal of existing single storey garage and utility to side, provision of new extensions to rear and side of the existing house at ground and first floor level with a pitched roof to the side extension, and flat roofs to the rear extensions. The floor area of the house will be increased by 88.9sqm. A new zinc canopy to be provided over the front entrance, and existing vehicular entrance to be widened to 3.3 metres. All external walls to be provided with external insulation and render, with new windows and doors throughout, together with internal modifications, alterations to drainage, and ancillary works.

44, Glenabbey Road, Mount Merrion, Blackrock, Dublin, A94E6T3Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.4 km away
Granted13 July 2023
D21A/0161

Permission for development. The proposed development will consist of: Conservation works to Thornhill House, to upgrade the house as a single family residence 494 sqm; the provision of 5No. own door two storey 2 bed dwellings to the rear of Thornhill House through the renovation, conversion and extension of an existing return and outbuildings located around an existing rear stable yard; and the provision of a terrace of 5 No. one-and-a-half storey mews dwellings located to the south of Thornhill House. The proposed conservation works and interventions to the house are to include - (i) Formation of new ope in partition to proposed kitchen in basement, (ii) Removal of door and alteration to window to rear hall at ground floor level; (iii) Modifications to WC and bathroom t landing level; (iv) Modifications to master ensuite at first floor level' (v) Removal of inappropriate internal doors to basement; and external architectural interventions / enhancements to include - (i) Removal of existing perspex screens to front portico, (ii) Removal of security grilles to windows and the rationalisation of soil pipes to the elevations (iii) Provision of new painted hardwood doors replacing inappropriate modern joinery elements to basement (iv) Improvements to external areas on eastern and western sides at basement level, (v) Removal of fixed maintenance ladders and gates to rear courtyard wall and provision of a private garden with associated railings, gates, soft and hard landscaping to the south and west of Thornhill House. Works to return and outbuildings to include creation of new opes, removal of sections of external wall and interior partitions, roofs to be removed and existing slates to be reused in new extension, removal of external courtyard wall and removal of corrugated roof over covered external space, wrought iron trusses and column supports, provision of new sash windows, refurbishment of existing original sash windows, replacement of non-original windows / doors, demolition of existing boiler room and WC to south-east of external courtyard. the proposed development will consist of the reconfiguration of the permitted ( Dun Laoghaire Rathdown County Council Reg. Ref. D17A/0240; An Bord Pleanála Ref. PL06D.300244) internal road layout, amendments to hard and soft landscaping, boundary treatment works including the provision of opes in the existing eastern stone wall and replacement of low wall and railings and all associated works above and below ground.

Site of c. 1.39 ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co.Dublin A Protected Structure (RPS No. 936)Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.4 km away
Refused22 April 2021
D20A/0432

Permission for development. The proposed development will consist of the reconfiguration and redesign of the permitted housing units (Dun Laoghaire Rathdown County Council Reg. Ref. D17A/0240; An Bord Pleanála Ref. PL06D.300244) to provide an increase from 9 No. houses (comprising 4no. four bed and 5no. five bed units) to 15 No. houses (comprising 3no. three bed and 12no. four bed units). Additional works include reconfiguration of the internal road layout, relocation of ESB substation, amendments to hard and soft landscaping, boundary treatment works and all associated works above and below ground. No works are proposed to Thornhill House (RPS No. 936), under this planning application.

Site of c. 1.39 ha, Thornhill House, CherryGarth, Mount Merrion, Blackrock, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.4 km away
Refused14 August 2020
D20A/0057

Permission for development. The proposed development will consist of the temporary removal of the eastern stone wall boundary and its subsequent reinstatement upon the completion of construction works on the wider site.

At a site of c.1.39ha, Thornhill House, Cherry Garth, Mount Merrion, Blackrock, Co. Dublin (Protected Structure Ref. No. 936)Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.4 km away
Refused18 March 2020
D25A/0862/WEB

Apply for Retention Permission for development within the grounds of Thornhill Oaks, and Thornhill House, a Protected Structure (RPS. 936). The development consists of the retention of an following: (i) Omission of railings to perimeter of central green; (ii) Omission of 4no. x pedestrian gates to the central green; (iii) Omission of hedge to perimeter of the central green; (iv) Omission of pedestrian crossing to the road on the southern side of the central green; (v) Addition of a low metal fence to centre/side of new hedge boundaries to rear gardens of Thornhill House & Houses 60 - 64 (inclusive); (vi) Provision of a pedestrian gate to the rendered blockwork wall to the southern boundary of the rear garden of House 64; (vii) Relocation of water feature from side boundary wall of House No. 64 to inner face of wall to communal courtyard serving Houses 60 to 64.

Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Co. Dublin, and Thornhill House (a Protected Structure) A94W7C5Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions0.4 km away
Granted14 January 2026
Showing 51-100 of 35,852
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