Planning Register
South Dublin County Council · SD21B/0649 · Permission

3, Knocklyon Avenue, Dublin 16

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

Council received 10 Mar 2022We first saw it 11 Sept 2026, 18:51 (1647 days after receipt — sources refresh weekly)
Applications only for this county. Appeals, zoning, RZLT and consultations: Dún Laoghaire-Rathdown and Fingal only for now.

SD21B/0649 is a planning application for permission at 3, Knocklyon Avenue, Dublin 16, received by South Dublin County Council on 10 Mar 2022 and first seen by Planning Register on 11 Sept 2026. The application describes: Alterations to existing house to include a ground floor extension to rear & side; first floor extension to side, new roof to include attic conversion with dormer windows to front & rear and associated site works. The council granted permission on 6 Apr 2022. The five-week observation window closed on 14 Apr 2022. A commencement notice (CN0146352SD) was lodged on 20 Aug 2026, so works have started on site. The site is zoned R2 — existing residential under the South Dublin County Council development plan. Within 500 m there are 57 other decided applications in the last five years and 3 appeals.

Appeal window closes 4 May 2022 closed 1592 days ago
4 weeks from the council's decision (6 Apr 2022) · s.37 Planning and Development Act 2000 · €220 to An Coimisiún Pleanála (€110 observer)
Council registerSite report

Proposal

Alterations to existing house to include a ground floor extension to rear & side; first floor extension to side, new roof to include attic conversion with dormer windows to front & rear and associated site works.

Status
Decision Following A.I.
Decision
Grant permission on 6 Apr 2022
Final grant
17 May 2022
Floor area
102 m²
Site (from polygon)
330 m²
Location precision
site (coords_polygon)

Timeline

  • 25 Feb 2022
    Further information requested
  • 10 Mar 2022
    Further information received
  • 10 Mar 2022
    New application
    Observation window closed 14 Apr 2022
  • 6 Apr 2022
    Decision
    Appeal window closed 4 May 2022

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Appeal

Not appealed.

Commencement

  • Opt out commencement notice CN0146352SD
    20 Aug 20263 Knocklyon Avenue, Dublin 16, Dublin, D16 Y9P0matched by ref_exact

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.

  • Radon risk area · 2
    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

Provenance

Register row from the national planning applications feed (NPAD), fetched 11 Sept 2026, 18:51 (store id 98118). 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/61732.

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