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Local land report · Fingal

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.

1 Derelict sites

1 site on the derelict sites register, with listed market values of €150,000.

The owner of a registered site pays a levy of 7% of its market value a year.

11 Stalled builds

11 sites started but not finished, 742 homes.

3 more in Fingal →

7 Permitted, not started

2,064 homes with planning permission and no start, across 7 permissions.

  • Site A · 971 homes granted 26 May 2023, expires 26 May 2028
  • Site B and Site C · 352 homes granted 11 Jun 2024, expires 11 Jun 2029
  • Porterstown · 302 homes granted 24 Jun 2026, expires 24 Jun 2031
  • Winterwood · 175 homes granted 19 Sep 2025, expires 19 Sep 2030
  • Clonsilla Inn · 170 homes granted 21 Jan 2025, expires 21 Jan 2030
  • Weavers Row · 72 homes granted 19 Dec 2023, expires 19 Dec 2028
  • Parkside Block 3 · 22 homes granted 17 Oct 2023, expires 17 Oct 2028

352 Zoned for housing, no permission

434 ha on the RZLT map with no live permission for 10 or more homes (352 parcels).

344 more in Fingal →

Land on the map is liable for the Residential Zoned Land Tax, 3% of market value a year.

165 Public land

182 ha of publicly owned land (165 sites); the largest holder is Fingal County Council.

157 more in Fingal →

5 Council selling land

5 council land disposals put to councillors (section 183).

Nothing on the registers for Castleknock: permission expired.

Open Castleknock on the map Every site in Castleknock

Questions about Castleknock

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.

Data as of 25 Sep 2026. Sources: Council derelict sites registers (Derelict Sites Act 1990); Commencement and completion notices (National Building Control Office); Planning applications (Department of Housing national planning data); Council Residential Zoned Land Tax maps; Land Development Agency, Register of Relevant Lands; Council meeting agendas (s.183 disposal notices).

Facts from public registers, gathered by Buildable (https://buildable.ie/land/fingal/13260403/report). Free to share and quote with a link. Not advice.