Leixlip Water Treatment Plant Site, Cooldrinagh & Backwestonpark lands, Leixlip, Co. Dublin
Data updated 12 Sept 2026 · register lag up to 7 days · sources & freshness
SD21A/0272 is a planning application for permission at Leixlip Water Treatment Plant Site, Cooldrinagh & Backwestonpark lands, Leixlip, Co. Dublin, received by South Dublin County Council on 1 Feb 2022 and first seen by Planning Register on 11 Sept 2026. The application describes: Demolition of existing workshop and (defunct) Activated Carbon Building adjacent the old/northern Treatment Plant Building; construction of a Sulphuric Acid Storage and Dosing Facility Building (single storey up to approximately 8.7 metres in height) adjacent the new/southern Treatment Plant Building; construction of a Lime Storage & Dosing Facility Building (single storey up to approximately 11 metres in height) adjoining the old/northern Treatment Plant Building, associated external storage silos (2) with external staircase (up to approximately 12.3 metres in height) partially enveloped with a perforated metal architectural screen, and ancillary plant and equipment; reconfiguration and repurposing for use as a De-Alkalisation Plant of existing (disused) High-Lift Pump Hall within the old/northern Treatment Plant Building; construction of a new ancillary Workshop Building (single storey up to approximately 4.5 metres in height) to the rear/south of the 'old/northern Treatment Plant Building; temporary and enabling works to facilitate construction and continued / uninterrupted operation of the Treatment Plant site; associated network of underground pipelines/connections, and redirection of existing where necessary, throughout the site; provision of additional car parking (to the rear/south of the old/northern Treatment Plant Building), modification and extension of existing drainage, utility and services infrastructure and connections to serve and facilitate new and reconfigured buildings, and all other associated and ancillary development and works above and below ground level. The council granted permission on 28 Feb 2022. The five-week observation window closed on 8 Mar 2022. A commencement notice (CN0127839SD) was lodged on 24 Apr 2025, so works have started on site. The site is zoned G3 — high amenity under the South Dublin County Council development plan. Within 500 m there are 26 other decided applications in the last five years.
Proposal
Demolition of existing workshop and (defunct) Activated Carbon Building adjacent the old/northern Treatment Plant Building; construction of a Sulphuric Acid Storage and Dosing Facility Building (single storey up to approximately 8.7 metres in height) adjacent the new/southern Treatment Plant Building; construction of a Lime Storage & Dosing Facility Building (single storey up to approximately 11 metres in height) adjoining the old/northern Treatment Plant Building, associated external storage silos (2) with external staircase (up to approximately 12.3 metres in height) partially enveloped with a perforated metal architectural screen, and ancillary plant and equipment; reconfiguration and repurposing for use as a De-Alkalisation Plant of existing (disused) High-Lift Pump Hall within the old/northern Treatment Plant Building; construction of a new ancillary Workshop Building (single storey up to approximately 4.5 metres in height) to the rear/south of the 'old/northern Treatment Plant Building; temporary and enabling works to facilitate construction and continued / uninterrupted operation of the Treatment Plant site; associated network of underground pipelines/connections, and redirection of existing where necessary, throughout the site; provision of additional car parking (to the rear/south of the old/northern Treatment Plant Building), modification and extension of existing drainage, utility and services infrastructure and connections to serve and facilitate new and reconfigured buildings, and all other associated and ancillary development and works above and below ground level.
- Status
- Decision Following A.I.
- Decision
- Grant permission on 28 Feb 2022
- Final grant
- 13 Apr 2022
- Floor area
- 656 m²
- Site (from polygon)
- 6,501 m²
- Location precision
- site (coords_polygon)
Timeline
- 29 Nov 2021Further information requested
- 1 Feb 2022Further information received
- 1 Feb 2022New applicationObservation window closed 8 Mar 2022
- 28 Feb 2022DecisionAppeal window closed 28 Mar 2022
Full planning report for 53.36027, -6.48814
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1 Where this is — preview
1 Deadlines still open
Appeal
Not appealed.
Commencement
- Commencement notice CN0127839SD
- Commencement notice CN0127838SD
- Commencement notice CN0096729SD
- Commencement notice CN0096315SD
- Commencement notice CN0095755SD
Zoning at the site
HA-LV: To protect and enhance the outstanding character and amenity of the Liffey Valley
Protected high-amenity landscape. Development is resisted to preserve the character of the area.
Designations within 250 m
OPW flood extent nearby — flag only (licence); floodinfo.ie.
- Natural Heritage Area (incl. proposed) · 2
- NIAH-recorded building · 45
- Radon risk area · 5
- Special Area of Conservation · 1
- Recorded monument · 22
Provenance
Register row from the national planning applications feed (NPAD), fetched 11 Sept 2026, 18:51 (store id 121100). Deadlines were computed by the store from the received / decided dates under the Planning and Development Act 2000 and are recorded as events, not recomputed here. Council register: https://planning.agileapplications.ie/southdublin/application-details/61387.
Source: npad · fetched 11 Sept 2026, 18:51
| Source | Licence | Fetched | Link |
|---|---|---|---|
| npad | CC-BY-4.0 | 11 Sept 2026, 18:51 | open |