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Development land in Castleknock

562 sites in Castleknock (Fingal) have a public reason they could sell. Zoned residential with no live permission: 434.1 ha.

Derelict and unbuilt land in Castleknock

As of 25 Sep 2026, Castleknock (Fingal) has 1 derelict site, 2,064 homes permitted but not started and 434 ha zoned for housing with no permission. 11 building sites started work and did not finish and the council has put 5 land disposals to councillors.

The local land report: print it or share it →

The sites

Permitted, not startedAll in Fingal →

  1. Site A

    Coolmine · Castleknock · 6.69 ha

    971 homes permitted, not started

  2. Site B and Site C

    Coolmine · Castleknock · 2.58 ha · zoned M4

    352 homes permitted, not started

  3. Porterstown

    Castleknock · 4.39 ha · zoned R1

    302 homes permitted, not started

  4. Winterwood

    Diswellstown · Castleknock · 1.88 ha · zoned R2

    175 homes permitted, not started

  5. Clonsilla Inn

    Porterstown · Castleknock · 2.08 ha · zoned M2

    170 homes permitted, not started

  6. Weavers Row

    Kellystown · Castleknock · 2.23 ha · zoned M2

    72 homes permitted, not started

  7. Parkside Block 3

    Ashtown · Castleknock · 0.66 ha · zoned R1

    22 homes permitted, not started

Council selling landAll in Fingal →

  1. Land at Porterstown Road, Porterstown, Dublin 15

    Castleknock · zoned G4

    Council selling or leasing the land

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

    Castleknock

    Council selling or leasing the land

  3. Residential land at Blanchardstown

    Castleknock · zoned R2

    Council selling or leasing the land

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

    Castleknock

    Council selling or leasing the land

  5. Residential land at Castleknock

    Castleknock · zoned R2

    Council selling or leasing the land

  6. Land at Kellystown, Dublin 15

    Porterstown · Castleknock

    Council selling or leasing the land

  7. Residential land at Castleknock

    Castleknock · zoned R2

    Council selling or leasing the land

Derelict siteAll in Fingal →

  1. Allendale House, Clonsilla Road, Dublin 15

    Kellystown · Castleknock

    On the derelict sites register

Stalled buildAll in Fingal →

  1. Diswellstown, Castleknock, Dublin 15

    Castleknock · 9.50 ha · zoned R2

    Stalled build

  2. Diswellstown, Castleknock, Dublin 15

    Castleknock · 9.50 ha · zoned R2

    Stalled build

  3. Grove Court Apartments External Works

    Coolmine · Castleknock · 0.34 ha · zoned M4

    Stalled build

  4. 1-88 Parkside, Block 1, Phoenix Park ave., Castleknock D15

    Ashtown · Castleknock · 0.63 ha · zoned R1

    Stalled build

  5. Clonsilla Link Road, Dublin 15

    Castleknock · 4.32 ha · zoned R2

    Stalled build

  6. Clonsilla Road, Clonsilla, Dublin 15

    Castleknock · 1.04 ha

    Stalled build

  7. Works at Oatlands House

    Diswellstown · Castleknock · 1.31 ha · zoned G3

    Stalled build

  8. 6 Homeleigh, Dublin

    Astagob · Castleknock · 0.41 ha · zoned R2

    Stalled build

  9. 55 Luttrellstown Drive, castleknock, Dublin

    Diswellstown · Castleknock · 0.00 ha · zoned R2

    Stalled build

  10. Grove Road office re-organisation

    Coolmine · Castleknock · zoned M4

    Stalled build

  11. UNIT 401 RETAIL PARK 1 BLANCHARDSTOWN CENTRE, Dublin, Fingal

    Coolmine · Castleknock · zoned M4

    Stalled build

On the RZLT map, no permissionAll in Fingal →

  1. Residential land at Castleknock

    Castleknock · 10.13 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  2. Residential land at Diswellstown

    Castleknock · 8.58 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  3. Residential land at Castleknock

    Castleknock · 8.06 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  4. Residential land at Castleknock

    Castleknock · 7.27 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  5. Residential land at Castleknock

    Castleknock · 7.22 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  6. Residential land at Laraghcon

    Castleknock · 6.71 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  7. Residential land at Blanchardstown

    Castleknock · 6.44 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  8. Residential land at Blanchardstown

    Castleknock · 6.10 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  9. Residential land at Castleknock

    Castleknock · 5.72 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  10. Residential land at Castleknock

    Castleknock · 5.52 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  11. Residential land at Castleknock

    Castleknock · 5.35 ha · zoned R2

    On the RZLT map, no permission

    On the RZLT map (3% land tax)

  12. Residential land at Astagob

    Castleknock · 5.30 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 Castleknock

    Castleknock · 32.41 ha · zoned G3

    Publicly owned land

  2. Public land at Laraghcon

    Castleknock · 9.15 ha · zoned G4

    Publicly owned land

  3. Public land at Coolmine

    Castleknock · 8.36 ha · zoned S3

    Publicly owned land

  4. Public land at Astagob

    Castleknock · 7.96 ha · zoned G4

    Publicly owned land

  5. Public land at Diswellstown

    Castleknock · 6.17 ha · zoned G3

    Publicly owned land

  6. Public land at Porterstown

    Castleknock · 5.95 ha · zoned G4

    Publicly owned land

  7. Public land at Diswellstown

    Castleknock · 4.88 ha · zoned G3

    Publicly owned land

  8. Public land at Diswellstown

    Castleknock · 4.21 ha

    Publicly owned land

  9. Public land at Castleknock

    Castleknock · 4.11 ha

    Publicly owned land

  10. Public land at Castleknock

    Castleknock · 3.23 ha · zoned G3

    Publicly owned land

  11. Public land at Coolmine

    Castleknock · 2.98 ha · zoned S3

    Publicly owned land

  12. Public land at Coolmine

    Castleknock · 2.85 ha · zoned M4

    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 Carpenterstown

    Castleknock · 4.05 ha · zoned R2

    On the RZLT map (3% land tax)

  6. Residential land at Kellystown

    Castleknock · 3.17 ha · zoned R1

    On the RZLT map (3% land tax)

  7. Residential land at Porterstown

    Castleknock · 2.31 ha · zoned R1

    On the RZLT map (3% land tax)

  8. Residential land at Kellystown

    Castleknock · 1.94 ha · zoned R2

    On the RZLT map (3% land tax)

    Underused site

  9. Residential land at Diswellstown

    Castleknock · 1.59 ha · zoned R2

    On the RZLT map (3% land tax)

  10. Residential land at Porterstown

    Castleknock · 1.49 ha · zoned R2

    On the RZLT map (3% land tax)

    Underused site

  11. Mixed-use land at Kellystown

    Castleknock · 1.36 ha · zoned M2

    On the RZLT map (3% land tax)

    Underused site

  12. Residential land at Porterstown

    Castleknock · 1.26 ha · zoned R2

    On the RZLT map (3% land tax)

    Underused site

Showing 62 of 562: the biggest of each kind. See every site on the map →

All 562 sites in Castleknock →

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New development 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.

Castleknock in numbers

  • 2,064Homes permitted, not started
  • 522.6Hectares zoned residential
  • 119Commencement notices, last 12 months

Planning applications in Castleknock (every application and decision, on Planning Register)

Other areas in Fingal

Figures as of 24 Sept 2026.

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