Planning Register
South Dublin County Council · SD26B/0225W · Retention

2 Mount Alton Court, Knocklyon, Dublin 16, D16 HW83

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

Council received 12 May 2026We first saw it 11 Sept 2026, 18:51 (123 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/0225W is a planning application for retention at 2 Mount Alton Court, Knocklyon, Dublin 16, D16 HW83, received by South Dublin County Council on 12 May 2026 and first seen by Planning Register on 11 Sept 2026. The application describes: The development consists of re-location and enlargement of ground floor window to eastern side elevation of dwelling-house. The council granted permission on 6 Jul 2026 (retention). The five-week observation window closed on 16 Jun 2026. The site is zoned R2 — existing residential under the South Dublin County Council development plan. Within 500 m there are 56 other decided applications in the last five years and 3 appeals.

Appeal window closes 4 Aug 2026 closed 39 days ago
4 weeks from the council's decision (6 Jul 2026) · s.37 Planning and Development Act 2000 · €220 to An Coimisiún Pleanála (€110 observer)
Council registerSite report

Proposal

The development consists of re-location and enlargement of ground floor window to eastern side elevation of dwelling-house.

Status
Final Grant
Decision
Grant permission for retention on 6 Jul 2026
Final grant
20 Aug 2026
Permission expires
19 Aug 2031
Site (from polygon)
462 m²
Location precision
site (coords_polygon)

Timeline

  • 12 May 2026
    New application
    Observation window closed 16 Jun 2026
  • 6 Jul 2026
    Decision
    Appeal window closed 4 Aug 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 · 2
      Knocklyon House; Idrone
    • Radon risk area · 1
      About 1 in 20 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 103846). 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/70308.

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