BuildableFree beta

How much public land is there in Castleknock?

182 ha in Castleknock is on the Land Development Agency's register of relevant public land, across 166 sites, as of 25 Sep 2026. The largest holder is Fingal County Council, with 94.1 ha.

From public registers, checked 25 Sep 2026. Updated nightly.

  • 94.1 haFingal County Council
  • 34.3 haDublin City Council
  • 32.4 haThe Office of Public Works
  • 18.4 haThe Minister for Education and Skills
  • 1.3 haHealth Service Executive

The largest public sites in Castleknock

  1. Public land in Castleknock

    Castleknock · Fingal · 32.41 ha · source

    Publicly owned land

    32.4 ha, Held by The Office of Public Works

  2. Public land in Castleknock

    Castleknock · Fingal · 9.15 ha · source

    Publicly owned land

    9.2 ha, Held by Fingal County Council

  3. Public land in Castleknock

    Castleknock · Fingal · 8.36 ha · source

    Publicly owned land

    8.4 ha, Held by The Minister for Education and Skills

  4. Public land in Castleknock

    Castleknock · Fingal · 7.96 ha · source

    Publicly owned land

    8.0 ha, Held by Fingal County Council

  5. Public land in Castleknock

    Castleknock · Fingal · 6.17 ha · source

    Publicly owned land

    6.2 ha, Held by Fingal County Council

  6. Public land in Castleknock

    Castleknock · Fingal · 5.95 ha · source

    Publicly owned land

    5.9 ha, Held by Fingal County Council

  7. Public land in Castleknock

    Castleknock · Fingal · 4.88 ha · source

    Publicly owned land

    4.9 ha, Held by Fingal County Council

  8. Public land in Castleknock

    Castleknock · Fingal · 4.21 ha · source

    Publicly owned land

    4.2 ha, Held by Dublin City Council

  9. Public land in Castleknock

    Castleknock · Fingal · 4.11 ha · source

    Publicly owned land

    4.1 ha, Held by Fingal County Council

  10. Public land in Castleknock

    Castleknock · Fingal · 3.23 ha · source

    Publicly owned land

    3.2 ha, Held by Fingal County Council

  11. Public land in Castleknock

    Castleknock · Fingal · 2.98 ha · source

    Publicly owned land

    3.0 ha, Held by Fingal County Council

  12. Public land in Castleknock

    Castleknock · Fingal · 2.85 ha · source

    Publicly owned land

    2.8 ha, Held by Fingal County Council

  13. Public land in Castleknock

    Castleknock · Fingal · 2.79 ha · source

    Publicly owned land

    2.8 ha, Held by The Minister for Education and Skills

  14. Public land in Castleknock

    Castleknock · Fingal · 2.78 ha · source

    Publicly owned land

    2.8 ha, Held by The Minister for Education and Skills

  15. Public land in Castleknock

    Castleknock · Fingal · 2.74 ha · source

    Publicly owned land

    2.7 ha, Held by Fingal County Council

  16. Public land in Castleknock

    Castleknock · Fingal · 2.71 ha · source

    Publicly owned land

    2.7 ha, Held by Dublin City Council

  17. Public land in Castleknock

    Castleknock · Fingal · 2.65 ha · source

    Publicly owned land

    2.6 ha, Held by Dublin City Council

  18. Public land in Castleknock

    Castleknock · Fingal · 2.6 ha · source

    Publicly owned land

    2.6 ha, Held by Dublin City Council

  19. Public land in Castleknock

    Castleknock · Fingal · 2.57 ha · source

    Publicly owned land

    2.6 ha, Held by Dublin City Council

  20. Public land in Castleknock

    Castleknock · Fingal · 2.55 ha · source

    Publicly owned land

    2.6 ha, Held by Fingal County Council

  21. Public land in Castleknock

    Castleknock · Fingal · 2.33 ha · source

    Publicly owned land

    2.3 ha, Held by The Minister for Education and Skills

  22. Public land in Castleknock

    Castleknock · Fingal · 2.22 ha · source

    Publicly owned land

    2.2 ha, Held by Fingal County Council

  23. Public land in Castleknock

    Castleknock · Fingal · 2.18 ha · source

    Publicly owned land

    2.2 ha, Held by Fingal County Council

  24. Public land in Castleknock

    Castleknock · Fingal · 1.99 ha · source

    Publicly owned land

    2.0 ha, Held by Fingal County Council

  25. Public land in Castleknock

    Castleknock · Fingal · 1.7 ha · source

    Publicly owned land

    1.7 ha, Held by Dublin City Council

Showing 25 of 166. See them all →

Go further

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.

More about Castleknock

Is there development land for sale in Castleknock?
Buildable found 17 sites in Castleknock with a public sign they could come to market, as of 25 Sep 2026: 5 council sites proposed for sale, 1 derelict site on the register and 11 stalled builds. These come from public registers, not agents' listings, so many are not advertised yet.
How many development sites are there in Castleknock?
Buildable tracks 563 development sites in Castleknock, as of 25 Sep 2026: every site with a public reason it could be built on or sold, from the councils' and national registers. They include 7 permitted schemes not started, 1 derelict site, 7 council land sales and 11 stalled builds.
What are the largest development sites in Castleknock?
179 development sites in Castleknock are a hectare or larger, as of 25 Sep 2026. The largest is public land in Castleknock, at 32.4 ha (publicly owned land).
How much land in Castleknock is on the RZLT map?
499 ha of land in Castleknock is on the Residential Zoned Land Tax map, across 371 parcels (2027 draft RZLT map), as of 25 Sep 2026. 434 ha of it has no live permission for 10 or more homes. The tax is 3% of market value a year, collected by Revenue on maps the councils make.

Data as of 25 Sep 2026. Sources: Land Development Agency, Register of Relevant Lands.

Cite this: How much public land is there in Castleknock? Buildable, data as of 25 Sep 2026. https://buildable.ie/q/public-land-castleknock

Facts from public registers, not advice. Every question · How it works