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.
From public registers, checked 25 Sep 2026. Updated nightly.
- 499 haOn the map
- 371Parcels
- 434 haNo live permission
The largest RZLT parcels in Castleknock
Land in Castleknock
Castleknock · Fingal · 14.21 ha · source
On the RZLT map (3% land tax)
14.2 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 12.79 ha · source
On the RZLT map (3% land tax)
12.8 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 10.13 ha · source
On the RZLT map (3% land tax)
10.1 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 8.58 ha · source
On the RZLT map (3% land tax)
8.6 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 8.55 ha · source
On the RZLT map (3% land tax)
8.6 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 8.52 ha · source
On the RZLT map (3% land tax)
8.5 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 8.06 ha · source
On the RZLT map (3% land tax)
8.1 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 7.27 ha · source
On the RZLT map (3% land tax)
7.3 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 7.22 ha · source
On the RZLT map (3% land tax)
7.2 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 6.71 ha · source
On the RZLT map (3% land tax)
6.7 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 6.44 ha · source
On the RZLT map (3% land tax)
6.4 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 6.1 ha · source
On the RZLT map (3% land tax)
6.1 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.72 ha · source
On the RZLT map (3% land tax)
5.7 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.52 ha · source
On the RZLT map (3% land tax)
5.5 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.35 ha · source
On the RZLT map (3% land tax)
5.3 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.3 ha · source
On the RZLT map (3% land tax)
5.3 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.26 ha · source
On the RZLT map (3% land tax)
5.3 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.19 ha · source
On the RZLT map (3% land tax)
5.2 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 5.01 ha · source
On the RZLT map (3% land tax)
5.0 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 4.68 ha · source
On the RZLT map (3% land tax)
4.7 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 4.41 ha · source
On the RZLT map (3% land tax)
4.4 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 4.27 ha · source
On the RZLT map (3% land tax)
4.3 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 4.24 ha · source
On the RZLT map (3% land tax)
4.2 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 4.22 ha · source
On the RZLT map (3% land tax)
4.2 ha, On the 2027 draft RZLT map
Land in Castleknock
Castleknock · Fingal · 4.09 ha · source
On the RZLT map (3% land tax)
4.1 ha, On the 2027 draft RZLT map
Showing 25 of 371. See them all →
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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 562 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?
- 178 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 zoned land in Castleknock has no planning permission?
- 434 ha in Castleknock is zoned for housing, on the RZLT map and has no live permission for 10 or more homes: 352 parcels, as of 25 Sep 2026. Land on the map is liable for the Residential Zoned Land Tax of 3% of market value a year.
Data as of 25 Sep 2026. Sources: Council Residential Zoned Land Tax maps.
Cite this: How much land in Castleknock is on the RZLT map? Buildable, data as of 25 Sep 2026. https://buildable.ie/q/rzlt-land-castleknock
Facts from public registers, not advice. Every question · How it works