Newtown Castlebyrn

597 registered freehold parcels lie mostly in Newtown Castlebyrn, from 3 m² to 13,362 m² (1.34 ha, 3.3 acres). The dashed line is the townland's boundary; 21 neighbouring parcels touch it.

Download the townland: DXF, in Irish Transverse Mercator metres, with its boundary, parcels and buildings; GeoJSON or KML.

• R2Objective A (Existing residential)
  COUNTY DEVELOPMENT PLAN 2022-2028, Dun Laoghaire-Rathdown · 463 parcels The zoning objective in the plan
• G1Objective F (Open space, park)
  COUNTY DEVELOPMENT PLAN 2022-2028, Dun Laoghaire-Rathdown · 6 parcels The zoning objective in the plan
• S5Objective SNI (Mixed/general community services/facilities uses)
  COUNTY DEVELOPMENT PLAN 2022-2028, Dun Laoghaire-Rathdown · 1 parcels The zoning objective in the plan

Source: Tailte Éireann and the Department of Housing (MyPlan), national zoning, CC BY 4.0.

• 3 Sept 2026Assessment period

  Alterations and extension to existing dwelling, comprising of alterations to fr

  Permission · Dun Laoghaire Rathdown County Council, D26A/0663/WEB

• 28 Aug 2026Declare application invalid

  Alterations and extension to existing dwelling, comprising of alterations to fr

  Permission · Dun Laoghaire Rathdown County Council, D26A/0645/WEB

• 28 Jul 2026Assessment period

  • Demolition of the roof of the existing extension to the side;• Construction of

  Permission · Dun Laoghaire Rathdown County Council, D26B/0430/WEB

• 9 Apr 2026Grant permission

  Retention Planning Permission for single storey detached garden room/gym/office

  Permission · Dun Laoghaire Rathdown County Council, D26B/0213/WEB

• 23 Mar 2026Grant permission

  The construction of a new first floor extension over existing ground floor util

  Permission · Dun Laoghaire Rathdown County Council, D26B/0165/WEB

• 17 Feb 2026Grant permission

  Permission is sought for the construction of a single and two storey rear extens

  Permission · Dun Laoghaire Rathdown County Council, D26B/0094/WEB

• 7 Dec 2025Grant permission

  Alterations and additions to the existing semi-detached house; including for the

  Permission · Dun Laoghaire Rathdown County Council, D25B/0681/WEB

• 28 Nov 2025Grant permission

  a) Extension of the existing roof to form new dormer style window extensions to

  Permission · Dun Laoghaire Rathdown County Council, D25B/0665

• 26 Nov 2025Grant permission & grant retention

  The construction of a first-floor extension to the side of the existing dwelling

  Permission for retention · Dun Laoghaire Rathdown County Council, D25B/0664/WEB

• 6 Oct 2025Grant permission for retention

  Retention permission to widen the driveway (3.195M) and the relocation of the dr

  Permission for retention · Dun Laoghaire Rathdown County Council, D25A/0756

• 30 Sept 2025S5 dec exempt

  Works consist of proposed single story 22.4m2 living and dining extension to rea

  Section 5 · Dun Laoghaire Rathdown County Council, REF16125

• 30 Sept 2025Declare application invalid

  Retention Permission for the relocation of a means of access to the public road.

  Permission for retention · Dun Laoghaire Rathdown County Council, D25A/0746

• 20 Aug 2025Grant permission

  A 28sqm. ground floor single story extension to the side of end terrace dwellin

  Permission · Dun Laoghaire Rathdown County Council, D25B/0466/WEB

• 31 May 2025Grant permission

  The construction of a new ground and first floor extension to the rear and the

  Permission · Dun Laoghaire Rathdown County Council, D25B/0306/WEB

• 2 May 2025Grant permission

  Installation of a 4.37m x 1.1m x 2.69m (LxWxH) above ground enclosure, to house

  Permission · Dun Laoghaire Rathdown County Council, D25A/0357/WEB

• 23 Apr 2025Grant permission

  Planning permission to overclad existing brick facade to front, rough cast pebbl

  Permission · Dun Laoghaire Rathdown County Council, D25B/0221

• 3 Apr 2025Grant permission

  (a) demolition of single storey attached garage to side (west) and rear, (b) con

  Permission · Dun Laoghaire Rathdown County Council, D25A/0271/WEB

• 18 Feb 2025Grant permission

  Demolition of existing detached garage and construction of a single storey exten

  Permission · Dun Laoghaire Rathdown County Council, D25B/0082/WEB

• 26 Nov 2024Grant permission for retention

  The development consists of: - Alterations to previously granted drawings as per

  Permission for retention · Dun Laoghaire Rathdown County Council, D24A/0936/WEB

• 8 Nov 2024Grant permission

  The demolition of the existing garage and construction of a two storey extensio

  Permission · Dun Laoghaire Rathdown County Council, D24A/0895/WEB

• 11 Sept 2024Declare application invalid

  The development consists of: - Alterations to previously granted drawings as per

  Permission for retention · Dun Laoghaire Rathdown County Council, D24A/0713/WEB

• 5 Aug 2024Declare invalid (site notice)

  The Development consists of: - Alterations to previously granted drawings as per

  Permission for retention · Dun Laoghaire Rathdown County Council, D24A/0598/WEB

• 26 Jul 2024Grant permission

  Permission for reconfiguring the layout of the ground and first floor

  Permission · Dun Laoghaire Rathdown County Council, D24B/0340

• 4 Jul 2024Grant permission

  The construction of a two storey extension to the side & rear of existing detach

  Permission · Dun Laoghaire Rathdown County Council, D24B/0301/WEB

• 28 Jun 2024Declare application invalid

  the construction of a two storey extension to the side & rear of existing detach

  Permission · Dun Laoghaire Rathdown County Council, D24B/0294/WEB

The 25 most recent of over 100 applications.

Source: National Planning Applications, Department of Housing, Local Government and Heritage, CC BY 4.0. Applicants are not shown.

Designated sites

No designated site (Special Area of Conservation, Special Protection Area, Natural Heritage Area or proposed one) touches the townland of Newtown Castlebyrn.

Recorded monuments

No recorded monument lies in the townland of Newtown Castlebyrn.

Architectural heritage

• Belfort, house, 1865–1875 · Regional interest
  Description

  Detached three-bay two-storey house, built 1870, on a rectangular plan with three- or four-bay two-storey side elevations. Occupied, 1911. Adapted to alternative use, 1936. Now disused. Hipped slate roof on an E-shaped plan centred on hipped slate roof (north) with clay ridge tiles, paired yellow brick Running bond central chimney stacks having chevron- or saw tooth-detailed corbelled stepped capping supporting yellow terracotta pots, and cast-iron rainwater goods to front (south) elevation on "Cavetto"-detailed red brick header bond cornice with cast-iron rainwater goods (remainder) on cut-granite eaves on "Cavetto"-detailed cornice. Red brick Flemish bond walls to front (south) elevation on cut-granite chamfered cushion course on granite ashlar plinth; rendered, ruled and lined surface finish (remainder) with rendered quoined piers to corners. Square-headed central door opening in square-headed recess approached by two cut-granite steps with encaustic tiled threshold, timber doorcase with panelled pilasters supporting Greek Key-detailed transom on "Acanthus"-detailed consoles, and red brick voussoirs framing timber panelled door having sidelights below overlight. Elliptical-headed window opening (first floor) with cut-granite sill course, timber mullions, and red brick voussoirs having bull nose-detailed reveals framing timber casement windows. Camber- or segmental-headed window openings with cut-granite sill courses, and red brick voussoirs framing one-over-one timber sash windows. Square-headed window openings to side elevations with cut-granite sills, and concealed red brick block-and-start surrounds framing two-over-two timber sash windows. Interior including (ground floor): central vestibule retaining encaustic tiled floor, and decorative plasterwork cornice to ceiling; square-headed door opening into hall with carved timber Classical-style surround framing glazed timber panelled double doors having overlight; hall retaining carved timber surrounds to door openings framing timber panelled doors, decorative plasterwork cornice to ceiling, staircase on a dog leg plan with turned timber "spindle" balusters supporting carved timber banister terminating in volute, carved timber surrounds to door openings to landing framing timber panelled doors, and plasterwork cornice to ceiling; reception room (west) retaining carved timber surrounds to door openings framing timber panelled doors with carved timber surround to window opening framing timber panelled shutters on panelled risers, and decorative plasterwork cornice to ceiling; reception room (east) retaining carved timber surround to door opening framing timber panelled door with carved timber surrounds to window openings framing timber panelled shutters on panelled risers, Ionic columnar screen, and decorative plasterwork cornices to ceilings; and carved timber surrounds to door openings to remainder framing timber panelled doors with carved timber surrounds to window openings framing timber panelled shutters on panelled risers. Set in shared grounds.

• Belfort, gate lodge, 1870–1880 · Regional interest
  Description

  Detached three-bay single-storey gate lodge, built 1875, on a T-shaped plan centred on single-bay single-storey projecting open porch. Restored, 2014-5. Now disused. Replacement hipped slate roof on a T-shaped plan centred on hipped slate roof on chamfered timber pillars (porch), ridge tiles, truncated central chimneystack, and cast-iron rainwater goods on timber eaves boards on rendered eaves retaining cast-iron downpipes. Rendered, ruled and lined walls. Camber- or segmental-headed central door opening in camber- or segmental-headed recess with cut-granite threshold, and concealed dressings having bull nose-detailed reveals with fittings now boarded-up. Camber- or segmental-headed flanking window openings with cut-granite sills, and concealed dressings framing protective panels over timber casement windows. Set perpendicular to road at entrance to grounds of Belfort.

• Mel Field sometimes Melfield, house, 1700–1796 · Regional interest
  Description

  Detached three-bay two-storey over part raised basement house with dormer attic, extant 1796, on a T-shaped plan centred on single-bay full-height breakfront with single-bay single-storey flat-roofed projecting open porch to ground floor; three-bay full-height rear (north) elevation with three-bay single-storey lean-to projection to ground floor. Sold, 1867. Occupied, 1911. Adapted to alternative use, 1979. Pitched slate roof on a cruciform plan behind parapet centred on pitched (gabled) slate roofs; lean-to slate roof (projection), clay or terracotta ridge tiles, rendered coping to gables with rendered chimney stacks to apexes having stepped capping supporting terracotta or yellow terracotta tapered pots, rendered coping to gable (north) with rendered chimney stack to apex having stepped capping supporting terracotta or yellow terracotta tapered pots, and concealed rainwater goods retaining cast-iron octagonal or ogee hoppers and downpipes. Replacement cement rendered wall to front (south) elevation on cut-granite chamfered cushion course on cement rendered base with cut-granite "Cyma Recta"- or "Cyma Reversa"-detailed cornice on blind frieze below parapet; roughcast surface finish (remainder). Paired square-headed central door openings approached by flight of seven cut-granite steps with concealed dressings framing glazed timber panelled doors having overlights. Square-headed window openings with cut-granite sills, and concealed dressings framing one-over-one (ground floor) or two-over-two (first floor) timber sash windows centred on timber casement window. Square-headed window openings to side elevations with cut-granite sills, and concealed dressings framing six-over-six (ground floor) or three-over-three (first floor) timber sash windows without horns. Square-headed window openings to rear (north) elevation centred on paired square-headed window openings with cut-granite sills, and concealed dressings framing two-over-two timber sash windows centred on timber casement windows. Square-headed window openings (projection) with cut-granite sills, and concealed dressings framing six-over-six timber sash windows without horns. Interior including (ground floor): central hall retaining carved timber surrounds to door openings framing timber panelled doors, double staircase with timber balusters supporting carved timber banisters centred on chamfered timber newel, and carved timber surrounds to door openings to landing framing timber panelled doors; and carved timber surrounds to door openings to remainder framing timber panelled doors with carved timber surrounds to window openings framing timber panelled shutters. Set in shared grounds.

• Mel Field sometimes Melfield, gate lodge, 1870–1880 · Regional interest
  Description

  Detached three-bay single-storey gate lodge, built 1875, on a T-shaped plan centred on single-bay single-storey projecting open porch. Restored, 2014-5. Now disused. Replacement hipped slate roof on a T-shaped plan centred on hipped slate roof on chamfered timber pillars (porch), ridge tiles, rendered central chimney stack on yellow brick Running bond base having corbelled stepped capping supporting yellow terracotta tapered pots, and cast-iron rainwater goods on timber eaves boards on rendered eaves retaining cast-iron downpipes. Rendered, ruled and lined walls on rendered chamfered plinth. Camber- or segmental-headed central door opening in camber- or segmental-headed recess with cut-granite step threshold, and concealed dressings having bull nose-detailed reveals framing timber panelled door. Camber- or segmental-headed flanking window openings with cut-granite sills, and rendered "bas-relief" lugged surrounds framing protective panels over timber casement windows. Set perpendicular to road at entrance to grounds of Mel Field.

• Milestone/milepost, 1844–1908 · Regional interest
  Description

  Freestanding benchmark-inscribed cut-granite milestone, extant 1908, on a triangular plan. Road fronted on concrete footpath.

• Bellavista, house, 1844–1879 · Regional interest
  Description

  Detached three-bay two-storey over part raised basement house, extant 1879, on an L-shaped plan centred on single-bay single-storey flat-roofed advanced open porch to ground floor abutting single-bay full-height projecting end bay on an engaged half-octagonal plan; two-bay (east) or three-bay (west) full-height side elevations. Occupied, 1911. Hipped slate roof on an L-shaped plan with clay or terracotta ridge tiles, paired rendered central chimney stacks having stringcourses below corbelled stepped capping supporting terracotta or yellow terracotta pots, and cast-iron rainwater goods on moulded rendered cornice retaining cast-iron octagonal or ogee hoppers and downpipes. Roughcast walls on cut-granite chamfered cushion course on rendered, ruled and lined base with rendered "bas-relief" quoined piers to corners supporting rendered "bas-relief" band to eaves. Square-headed central door opening approached by flight of eight cut-granite steps with rendered "bas-relief" block-and-start surround framing timber panelled door having overlight. Square-headed window openings with cut-granite sills, and rendered "bas-relief" block-and-start surrounds framing one-over-one (ground floor) or two-over-two (first floor) timber sash windows. Set in landscaped grounds with yellow brick Running bond panelled piers to perimeter having chevron- or saw tooth-detailed stringcourses below cut-granite shallow gabled capping supporting timber double gates.

• Rockford, country house, 1880–1885 · Regional interest
  Description

  Detached four-bay two-storey country house with dormer attic, rebuilt 1881-2, on an L-shaped plan; single-bay (east) or three-bay (west) two-storey side elevations. Extended, 1895, producing present composition. Occupied, 1901. Leased, 1911. Adapted to alternative use, 2000. Set in relandscaped grounds.

• Rockford, gates/railings/walls, 1800–1837 · Regional interest
  Description

  Gateway, extant 1837, on a symmetrical plan comprising pair of granite ashlar chamfered piers on cut-granite chamfered plinths having inscribed cut-granite stringcourses below shallow pyramidal capping supporting spear head-detailed cast-iron double gates with granite ashlar chamfered outer piers on cut-granite chamfered plinths having cut-granite stringcourses below shallow pyramidal capping. Road fronted at entrance to grounds of Rockford.

• Rowan House, house, 1844–1887 · Regional interest
  Description

  Detached three-bay two-storey house, extant 1887, on a T-shaped plan with single-bay (single-bay deep) two-storey double-pile lower central return (west). Occupied, 1911. Adapted to alternative use, 1994. Pitched slate roof behind parapet; hipped and pitched double-pile (M-profile) slate roof (west), clay ridge tiles, rendered coping to gables with rendered chimney stacks to apexes having corbelled stepped stringcourses below capping supporting terracotta tapered pots, and concealed rainwater goods. Rendered channelled wall (ground floor); rendered, ruled and lined surface finish (first floor) with rusticated rendered piers to corners supporting dentilated "Cyma Recta" or "Cyma Reversa" cornice on blind frieze below parapet having rendered coping; rendered, ruled and lined surface finish (remainder). Square-headed central door opening with step threshold, and rendered doorcase with panelled pilasters supporting "Cyma Recta" or "Cyma Reversa" hood moulding on "Acanthus"-detailed fluted consoles framing replacement timber panelled door having sidelights on panelled risers below overlight. Square-headed flanking window openings in square-headed "bas-relief" recesses with cut-granite sills, and concealed dressings centred on vermiculated keystones framing two-over-two timber sash windows. Square-headed window openings (first floor) with sill course on consoles, and moulded rendered surrounds framing two-over-two timber sash windows. Interior including (ground floor): central hall retaining carved timber surrounds to door openings framing timber panelled doors; and carved timber surrounds to door openings to remainder framing timber panelled doors with timber panelled shutters to window openings. Set back from line of road with roughcast piers to perimeter having shallow pyramidal capping.

Designated sites: National Parks and Wildlife Service. Recorded monuments: Sites and Monuments Record, National Monuments Service. Buildings: National Inventory of Architectural Heritage. Department of Housing, Local Government and Heritage, CC BY 4.0. Works at or in relation to a recorded monument need two months' written notice to the National Monuments Service (National Monuments (Amendment) Act 1994, section 12).

Radon

About 1 in 20 homes in this area is likely to have high radon levels. Testing a home

Landslides

Susceptibility low, on the 1:50,000 map.

Terrain model

LiDAR of the Office of Public Works, flown in 2011, at 2 m: tile OPW_3311 (ZIP).

Flooding

The flood maps of the Office of Public Works: floodinfo.ie.

Radon Risk Map of Ireland, Environmental Protection Agency; Landslide Susceptibility Classification, Geological Survey Ireland; both CC BY 4.0. LiDAR: contains Irish Public Sector Data (Geological Survey Ireland & the Office of Public Works) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence.

No address of the register names Newtown Castlebyrn with five sales or more. The sales of the area are on the page of Co. Dublin.

Name

Newtown Castlebyrn · Caisleán Uí Bhroin

Area

370,634 m² (37.06 ha, 91.59 acres)

Civil parish

Monkstown, and its townlands

Barony

Rathdown

Electoral division

Blackrock-Newpark, the unit of the census

Census 2022

Blackrock-Newpark electoral division: 2,278 people in 774 households; 85% of households own their home; 8% of homes were built since 2001; 4% of dwellings stood vacant on census night, and 0% were holiday homes.

Neighbouring townlands

Kill of The Grange, Lansville, Mountashton, Newtownpark, Rockfield, Stillorgan Park, Stradbrook

Placenames

Newtown Castlebyrn on logainm.ie, the Placenames Database of Ireland

Townlands, civil parishes, baronies and electoral divisions, National Statutory Boundaries, Tailte Éireann, CC BY 4.0. Census 2022, Small Area Population Statistics by electoral division, Central Statistics Office, CC BY 4.0. A townland is the smallest land division of Ireland, and the unit of a rural address; old registers such as the 1901 and 1911 censuses file it under its civil parish and barony.