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Planning records

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D26B/0071/WEB

The development consists of the following: Conversion of existing attic space to new bedroom and en-suite with dormer window and roof light to the rear of the property and 1no. rooflight to the front elevation, and all associated site works necessary to facilitate the development.

49 Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Dublin, A94Y8X5Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted31 March 2026
D25A/0825/WEB

(1) The provision of a new first floor and pitched roof. (2) The provision of a new front porch. (3) The provision of a new covered outdoor space to the side of the existing house. (4) Associated alterations to all elevations including the provision of external wall insulation. (5) The provision of a new wastewater treatment system with sand polishing filter.

Graigueconna Cottage, Thornhill Road, Ballyman, Dublin, A98TY43Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted28 January 2026
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 conditions
Granted14 January 2026
D25B/0471/WEB

(1) The provision of a new first floor and pitched roof. (2) The provision of a new front porch. (3) The provision of a new covered outdoor space to the side of the existing house. (4) Associated alterations to all elevations including the provision of external wall insulation. (5) The provision of a new wastewater treatment system with sand polishing filter.

Graigueconna Cottage, Thornhill Road, Old Conna, Dublin, A98TY43Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Refused15 October 2025
2560420

(a) removal of existing dwelling roof complete and replace with new first floor structure (b) new front porch (c) single storey rear extension for utility room (d) demolition of one existing shed (e) replacement/upgraded wwts (f) demolition of domestic shed (g) temporary retention of mobile home

Thornhill, Blacklion, Co.CavanCavan County CouncilPERMISSION0 reasons0 conditions
Granted12 September 2025
D25A/0466/WEB

Alterations to previously granted planning application reg/ref: D24A/0932/WEB to include attic dormer with window to the rear and associated works.

68, Thornhill Road, Mount Merrion, Lower Kilmacud Road, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Refused01 August 2025
D25A/0354/WEB

(1) The provision of a new first floor and pitched roof; (2) The provision of a new single storey extension to the rear of the existing house; (3) The provision of a new front porch; (4) The provision of a new covered outdoor space to the side of the existing house; (5) Associated alterations to all elevations; (6) The provision of a new wastewater treatment system with sand polishing filter.

Graigueconna Cottage, Thornhill Road, Ballyman, Bray, Co.Dublin, A98TY43Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Refused23 June 2025
D25A/0183/WEB

Alterations to previously granted planning application reg/ref: D24A/0932/WEB to include: increased separation of first floor west gable wall from boundary line, reduction in size of ground floor rear extension, modifications to configuration of first floor rear extension, inclusion of two modest east facing first floor windows, roof light to the front and associated works.

68, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94E2R9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted01 May 2025
D25A/0176

Proposed 75sqm two storey extension to rear of 41sqm single storey dwelling, demolition of existing front entrance porch and reconstruction of same, new waste water treatment system to EPA standards, revised entrance and all associated works.

4 Thornhill Road, Old Conna, Bray, Co. Dublin, A98W7E8Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Refused28 April 2025
D25A/0089/WEB

Retention Permission is sought for demolition of the existing dwelling and garage in its entirety, Permission is sought for the construction of a new two storey house and single storey extension to rear (with 1 no rooflight); increase in width of existing front vehicular entrance & all associated site works to a demolished two storey semi-detached house at 40 Thornhill Road, Mount Merrion, Blackrock, Co. Dublin, A94 K4X0.

40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0Dun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions
Granted02 April 2025
D24A/0932/WEB

Demolition of the existing single storey garage / extension to the side and rear and existing chimney to the rear. Construction of new two storey pitched roof extension to the side and rear with bay projection to the front, part two storey / part single storey flat roof extension to the rear, internal alterations including attic conversion and roof lights to the side and rear. Works will also consist of widening of existing vehicular entrance, site drainage, landscaping and associated works.

68, Thornhill Road, Mount Merrion, Blackrock, Co. Dublin, A94E2R9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted23 January 2025
D24B/0425/WEB

Oak View Property Developments Limited, intend to apply for Retention Permission for development within the grounds of Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Co. Dublin. The development consists of the Retention of an external flight, (2.2 metres wide), of stone steps, (consisting of 10 no. x ambulant steps), providing pedestrian access, located at the southern gable of the existing Apartment block. Retention is also sought of a second flight (1.8 metres wide) of external stone steps, which also provides pedestrian access to Thornhill Oaks. This flight (consisting of a total of 6 no. x ambulant steps) is located west of the existing car ramp entrance to the Apartment block.

Thornhill Oaks, Cherrygarth, Mount Merrion, Blackrock, Dublin, A94W7C5Dun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions
Granted02 December 2024
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 conditions
Granted19 September 2024
D24B/0265

Permission for Amendments to previously granted permission register Reference D23B/0062 for development. The development will consist of: Demolition of existing single storey extension to side and chimney. The construction of a new single storey extension to side and smaller single storey extension to rear for proposed study, new layout for kitchen/ living and utility area and new long window to existing front elevation.

64, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94T6T0Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted29 July 2024
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 conditions
Refused25 March 2024
D23B/0227

New wastewater treatment unit and soil polishing filter to EPA 2021 Standards, removal of of existing septic tank and associate works.

Thornhill Lodge, Thornhill Road, Old Connaught, Bray, Dublin, A98N4X9Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted11 July 2023
D23A/0302

Demolition of the single storey conservatory extension to rear and the garage and store to side to allow for the subsequent construction of a two storey extension to side and single storey extension to rear with 1 no. rooflight. New two storey protruding extension to front. 2 no. new bay windows to front at ground floor. 2no. new projecting windows to rear at first floor level. External insulation to all external walls, modifications to existing fenestration, increase in width of existing front vehicular entrance & all associated site works to an existing two storey semi-detached house.

40, Thornhill Road, Mount Merrion, Blackrock, Dublin, A94K4X0Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted23 June 2023
D23B/0062

Demolition of existing single storey extension to side, utility room to rear and chimney. The construction of a new single storey extension to side and rear for proposed study, new layout for kitchen/living and utility area and new long window to existing front elevation. Construction of first floor extension to the side for a new family bathroom.

64, Thornhill Road, Mount Merrion, Dublin, A94T6T0Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted11 April 2023
D22A/0975

Retention Permission. The development will consist of an increase to the existing driveway entrance by 0.5 metres with new pier to match existing.

39 Thornhill Road, Mount Merrion, Blackrock, Co Dublin, A94Y7V7Dun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions
Granted03 February 2023
WEB2069/22

RETENTION: The development consists of amendments to existing bungalow dwelling including single storey extensions to the sides and to the rear of the house; internal alterations; new rooflights to the existing roof; amendments to existing windows and doors; new window to the front of the house; external wall insulation; solar panels; all associated site-works, ancillary drainage and landscaping.

2 Thornhill Lane, Mount Prospect Avenue, Dublin 3, D03 ED34Dublin City CouncilRetention Permission0 reasons0 conditions
Granted01 February 2023
D22A/0294

Permission is sought to replace existing rendered block wall between existing piers with new metal entrance gates to walled garden, facing onto roadway adjacent.

Croghan Lodge, Thornhill Road, Bray, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted14 October 2022
D22A/0613

Permission for development. The development will consist of the removal of the existing fascia and rooflights to the single storey extension to the side of the house and porch overhang to the front. The removal of the chimney stack to the rear. The construction of a first floor extension on the same footprint as the ground floor with flat roof and parapet detail to accommodate a master bedroom en suite, utility room, study and small balcony over porch to front with access from study.

26, Thornhill Road, Mount Merrion, Dublin, A94N4V8Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted10 October 2022
22811

Proposed dwelling with connection to services and associated works

Rear of 4 Old Fassaroe Glen, Thornhill Road, BrayWicklow County CouncilPERMISSION0 reasons0 conditions
Refused05 September 2022
D22B/0072

Retention permission. The area to be retained consists of

36 Thornhill Road, Mount Merrion, Co. Dublin, A94A6K2Dun Laoghaire Rathdown County CouncilPermission for Retention0 reasons0 conditions
Granted11 April 2022
WEB5190/21

The development will consist of amendments to existing bungalow dwelling, including for; new ground floor single storey front, side and rear extensions, relocation of dwelling front door, provision of first floor bedroom window to front gable, and all associated site development works on a site area of 0.051ha.

2 Thornhill Lane, Mount Prospect Avenue, Clontarf, Dublin 3Dublin City CouncilPermission0 reasons0 conditions
Granted10 February 2022
D21A/0635

The development will consist of

7, Thornhill Road, Mount Merrion, Blackrock, County Dublin, A94D1WSDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted27 August 2021
D21A/0601

Permission is sought for the construction

St. Gerard's School, Thornhill Road, Bray, Co Dublin, (Protected Structure)Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted18 August 2021
D21A/0453

Permission is sought for the construction

8, Thornhill Road, Mount Merrion, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted14 July 2021
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 conditions
Refused22 April 2021
D20B/0358

Permission for development at this site

17, Thornhill Road, Mount Merrion, Dublin, A94EOW6Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted22 March 2021
D20A/0738

Retention is sought for widened

36, Thornhill Road, Mount Merrion, Co DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted01 December 2020
D20A/0658

Permission for alterations and additions to existing

No.33 Thornhill Road, Mount Merrion, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted11 November 2020
20421

For (a) milking parlour with dairy, feed passage, slatted sections, underground storage tanks and external agitation points (b) silage pit (c) meal storage shed, (d) concrete aprons and associated site works

Thornhill or Mullandreenagh, Blacklion, Co CavanCavan County CouncilPERMISSION0 reasons0 conditions
Granted04 November 2020
D20B/0151

Permission for proposed first floor extension over

Laurel Bank, Thornhill Road, Ballyman, Co. DublinDun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted21 August 2020
D20B/0050

Permission sought for (a) Removal of existing storey rear extension (b) construction of new single storey extension to rear with flush glaze type roof lights and projecting canopy (c) first floor extension to side and rear with hopped roof and Velux type windows (d) new projecting canopy, windows and front door at front elevation (e) associated internal alterations, drainage and external works.

18, Thornhill Road, Mount Merrion, Co. Dublin, A94 YX22Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted19 August 2020
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 conditions
Refused14 August 2020
D20B/0125

The development will consist of the construction of

27 Thornhill Road, Mount Merrion, Blackrock, Co. Dublin A94 N8C5Dun Laoghaire Rathdown County CouncilPermission0 reasons0 conditions
Granted10 July 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 conditions
Refused18 March 2020
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