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Development sites in Blanchardstown, Castleknock and Ongar

Also known as Blanchardstown, Castleknock, Clonsilla, Ongar · Fingal

1,663 sites in Blanchardstown, Castleknock and Ongar have a public sign they could come up, and 3,363 homes have planning permission but have not started.

  • 3,363homes permitted, not started (9 sites)
  • 1,113.2 haon the 2027 draft RZLT map (1,257 parcels)
  • 991.1 hazoned residential, no live permission
  • 2permissions expired unbuilt
  • 32council land sales
  • 13derelict sites
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New sites in Fingal, every Monday

The week's new sites: permission running out, council selling land, derelict or stalled. Each with its source. Free while in beta.

About Dublin 15 electoral areas

Dublin 15 has no published boundary, so this page uses the three Fingal electoral areas that cover it: Castleknock, Blanchardstown-Mulhuddart and Ongar.

Fingal County Council decides planning here; the large remaining schemes are on the Phoenix Park Racecourse lands, at Porterstown and north of Tyrrelstown.

The sites

Permitted, not startedAll in Fingal →

  1. Barberstown

    Barnhill · Ongar · 29.59 ha · zoned R1

    1,243 homes permitted, not started

  2. Site A

    Coolmine · Castleknock · 6.69 ha

    971 homes permitted, not started

  3. Site B and Site C

    Coolmine · Castleknock · 2.58 ha · zoned M4

    352 homes permitted, not started

  4. Porterstown

    Castleknock · 4.39 ha · zoned R1

    302 homes permitted, not started

  5. Winterwood

    Diswellstown · Castleknock · 1.88 ha · zoned R2

    175 homes permitted, not started

  6. Clonsilla Inn

    Porterstown · Castleknock · 2.08 ha · zoned M2

    170 homes permitted, not started

  7. Weavers Row

    Kellystown · Castleknock · 2.23 ha · zoned M2

    72 homes permitted, not started

  8. Allendale House

    Clonsilla · Ongar · 1.37 ha · zoned R2

    56 homes permitted, not started

Permission expiredAll in Fingal →

  1. Brady's Public House

    Blanchardstown · Blanchardstown-Mulhuddart · 0.32 ha · zoned R2

    Permission for 210 homes expired unbuilt

    Underused site

  2. Hansfield

    Barnhill · Ongar · 5.82 ha · zoned R2

    Permission for 106 homes expired unbuilt

Council selling landAll in Fingal →

  1. Land at Corduff

    Blanchardstown-Mulhuddart · zoned S3

    Council selling or leasing the land

  2. Land at Porterstown Road, Porterstown, Dublin 15

    Castleknock · zoned G4

    Council selling or leasing the land

  3. Land at Coolmine

    Blanchardstown-Mulhuddart

    Council selling or leasing the land

    Derelict site

  4. Land at Cappogue Industrial Estate, Ballycoolin Road, Dublin 15

    Ballycoolen · Blanchardstown-Mulhuddart · zoned S6

    Council selling or leasing the land

  5. Land adjacent to Oatlands Gate Lodge, Porterstown Road, Dublin 15

    Castleknock

    Council selling or leasing the land

  6. Land at Coolmine

    Blanchardstown-Mulhuddart

    Council selling or leasing the land

    Derelict site

  7. Land at Powerstown, Tyrellstown, Dublin 15

    Blanchardstown-Mulhuddart · zoned P1

    Council selling or leasing the land

  8. Land at North Road, Coldwinters, Dublin 11

    Dunsoghly · Blanchardstown-Mulhuddart · zoned G3

    Council selling or leasing the land

Derelict siteAll in Fingal →

  1. Allendale House, Clonsilla Road, Dublin 15

    Kellystown · Castleknock

    On the derelict sites register

  2. Site 1A, The Nurseries, Mulhuddart, Dublin 15

    Coolmine · Blanchardstown-Mulhuddart

    On the derelict sites register

Stalled buildAll in Fingal →

  1. Hollywoodrath, Hollystown, Dublin 15

    Blanchardstown-Mulhuddart · 28.54 ha · zoned R2

    Stalled build

  2. Diswellstown, Castleknock, Dublin 15

    Castleknock · 9.50 ha · zoned R2

    Stalled build

  3. Diswellstown, Castleknock, Dublin 15

    Castleknock · 9.50 ha · zoned R2

    Stalled build

  4. Residential land at Barberstown

    Ongar · 6.70 ha · zoned R2

    Stalled build

  5. Hansfield Phase 3: 9 houses

    Barberstown · Ongar · 6.70 ha · zoned R2

    Stalled build

  6. Barnwell Way & Barnwell Lane, Hansfield, Dublin 15

    Barberstown · Ongar · 6.70 ha · zoned R2

    Stalled build

  7. Grove Court Apartments External Works

    Coolmine · Castleknock · 0.34 ha · zoned M4

    Stalled build

  8. 1-88 Parkside, Block 1, Phoenix Park ave., Castleknock D15

    Ashtown · Castleknock · 0.63 ha · zoned R1

    Stalled build

On the RZLT map, no permissionAll in Fingal →

  1. Residential land at Tyrrelstown

    Blanchardstown-Mulhuddart · 22.75 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  2. Residential land at Castleknock

    Castleknock · 10.13 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  3. Mixed-use land at Ballymun

    Blanchardstown-Mulhuddart · 9.39 ha · zoned M1

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  4. Residential land at Diswellstown

    Castleknock · 8.58 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  5. Residential land at Littlepace

    Ongar · 8.40 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  6. Residential land at Castleknock

    Castleknock · 8.06 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  7. Mixed-use land at Balcurris

    Blanchardstown-Mulhuddart · 7.84 ha · zoned M1

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  8. Residential land at Castleknock

    Castleknock · 7.27 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

Publicly owned landAll in Fingal →

  1. Public land at Cruiserath

    Blanchardstown-Mulhuddart · 38.90 ha · zoned C3

    Publicly owned land

  2. Public land at Castleknock

    Castleknock · 32.41 ha · zoned G3

    Publicly owned land

  3. Public land at Buzzardstown

    Blanchardstown-Mulhuddart · 31.27 ha · zoned C3

    Publicly owned land

  4. Public land at Dunsink

    Blanchardstown-Mulhuddart · 27.33 ha · zoned R1

    Publicly owned land

  5. Public land at Dunsink

    Blanchardstown-Mulhuddart · 26.90 ha · zoned R1

    Publicly owned land

  6. Public land at Goddamendy

    Blanchardstown-Mulhuddart · 25.15 ha · zoned C2.1

    Publicly owned land

  7. Public land at Parslickstown

    Blanchardstown-Mulhuddart · 24.33 ha · zoned G3

    Publicly owned land

  8. Public land at Buzzardstown

    Blanchardstown-Mulhuddart · 20.43 ha · zoned S3

    Publicly owned land

On the RZLT map (3% land tax)All in Fingal →

  1. Residential land at Carpenterstown

    Castleknock · 14.21 ha · zoned R2

    On the RZLT map (3% land tax)

  2. Residential land at Ashtown

    Castleknock · 12.79 ha · zoned R1

    On the RZLT map (3% land tax)

  3. Residential land at Porterstown

    Castleknock · 8.55 ha · zoned R1

    On the RZLT map (3% land tax)

  4. Residential land at Diswellstown

    Castleknock · 8.52 ha · zoned R2

    On the RZLT map (3% land tax)

  5. Residential land at Barnhill

    Ongar · 7.40 ha · zoned R1

    On the RZLT map (3% land tax)

  6. Residential land at Barberstown

    Ongar · 7.32 ha · zoned R1

    On the RZLT map (3% land tax)

  7. Residential land at Clonsilla

    Ongar · 6.58 ha · zoned R2

    On the RZLT map (3% land tax)

  8. Residential land at Carpenterstown

    Castleknock · 4.05 ha · zoned R2

    On the RZLT map (3% land tax)

Showing 52 of 1,663: the biggest of each kind. See every site on the map →

More on Dublin 15 electoral areas

Figures as of 25 Sept 2026.

Sources: Fingal Development Plan 2023–2029.

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