Planning Register
South Dublin County Council · SD26B/0018W · Retention

11 Liffey Downs, Liffey Valley Park, Lucan, K78PK40

Data updated 12 Sept 2026 · register lag up to 7 days · sources & freshness

Council received 19 Jan 2026We first saw it 11 Sept 2026, 18:51 (236 days after receipt — sources refresh weekly)
Applications only for this county. Appeals, zoning, RZLT and consultations: Dún Laoghaire-Rathdown and Fingal only for now.

SD26B/0018W is a planning application for retention at 11 Liffey Downs, Liffey Valley Park, Lucan, K78PK40, received by South Dublin County Council on 19 Jan 2026 and first seen by Planning Register on 11 Sept 2026. The application describes: Planning for Retention of a c.40sqm prefabricated garden room/granny flat in the rear garden. The council declared the application invalid on 27 Jan 2026. The five-week observation window closed on 23 Feb 2026. The site is zoned R2 — existing residential under the South Dublin County Council development plan. Within 500 m there are 77 other decided applications in the last five years and 2 appeals.

Appeal window closes 24 Feb 2026 closed 200 days ago
4 weeks from the council's decision (27 Jan 2026) · s.37 Planning and Development Act 2000 · €220 to An Coimisiún Pleanála (€110 observer)
Council registerSite report

Proposal

Planning for Retention of a c.40sqm prefabricated garden room/granny flat in the rear garden

Status
Invalid - Site Notice
Decision
Invalid - site notice on 27 Jan 2026
Floor area
38 m²
Site (from polygon)
480 m²
Location precision
site (coords_polygon)

Timeline

  • 19 Jan 2026
    New application
    Observation window closed 23 Feb 2026
  • 27 Jan 2026
    Decision
    Appeal window closed 24 Feb 2026

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Appeal

Not appealed.

Commencement

No commencement notice matched to this reference.

    Zoning at the site

    R2 — Existing residential

    RES: To protect and/or improve residential amenity

    An established residential area. The objective is to protect existing residential amenity as well as to provide housing — which is the objective a neighbour's objection to an overbearing extension is usually argued under.

    Designations within 250 m

    No OPW flood extent nearby.

    • NIAH-recorded building · 1
      Ballyowen Cottage
    • Radon risk area · 4
      About 1 in 10 homes in this area is likely to have high radon levels; About 1 in 20 homes in this area is likely to have high radon levels; About 1 in 5 homes in this area is likely to have high radon levels

    Provenance

    Register row from the national planning applications feed (NPAD), fetched 11 Sept 2026, 18:51 (store id 111302). 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/69654.

    Source: npad · fetched 11 Sept 2026, 18:51
    SourceLicenceFetchedLink
    npadCC-BY-4.011 Sept 2026, 18:51open