5/5A, Knocklyon Cottages, Knocklyon Road, Knocklyon, Dublin 16
The proposed development will consist of the subdivision of the existing rear garden space, to enable the erection of 2no. single storey, 3-bed, detached dwellings; access to the development will be provided via a new roadway, from Knocklyon Rd; and, all associated site works, including landscaping, boundary walls and treatments, Suds drainage, to facilitate the development.
The application
- Reference
- SD26A/0197W · full record
- Authority
- South Dublin County Council
- Type
- Permission
- Status
- Valid
- Applicant
- not published by the national dataset — see the council register
- Units
- —
- Floor area
- 235 m²
- Site area
- 1,642 m²
- Received
- 18 Aug 2026
- We first saw it
- 11 Sept 2026, 18:51
- Decision due
- 12 Oct 2026
- Decision
- not yet decided
The national dataset truncates descriptions (80 characters for DLR, 70 for Fingal) and omits the applicant. The full description and the drawings are on the council register linked in step 1.
How to submit an observation
- Read the file on the council register.Drawings, planning statement and site notices are at https://planning.agileapplications.ie/southdublin/application-details/70852.
- Write your observation.Quote
SD26A/0197Wat the top, give your name and the address the authority should reply to, and confine it to planning matters — zoning objective, height, overlooking, traffic, drainage, heritage. What you say here is what you can later appeal on. - Pay the €20 fee.Every submission needs it; without it the observation is invalid and is returned. South Dublin County Council takes it online with the submission or at the counter.
- Submit before 22 Sept 2026.Online through the register above, or in writing to the Planning Department, South Dublin County Council. The test is the date the authority receives it, not the date you post it.
- Keep the acknowledgement.The council's receipt is your proof of a valid observation — see below.
Statutory basis. Section 34(1) of the Planning and Development Act 2000 (as amended) requires a planning authority to consider any submission or observation made to it in accordance with the Regulations. Article 29 of the Planning and Development Regulations 2001 (as amended) sets the window: a submission or observation must be received by the authority within five weeks beginning on the date of receipt of the application, and must be accompanied by the prescribed fee of €20. A submission received after the window, or without the fee, is invalid and the authority must return it.
What the site is zoned
| Code | Objective | Plan | In force |
|---|---|---|---|
| R2 Existing residential | RES: To protect and/or improve residential amenity | SD-001:DP:south-dublin-county-development-plan-2022-2028 | 8 Mar 2022 → 8 Mar 2028 |
An application that accords with the zoning objective is hard to resist on principle; one that does not may be a material contravention, which the council can only grant by the s.34(6) procedure with its own notice and window.
Source: SDCC SD-001:DP:south-dublin-county-development-plan-2022-2028 · fetched 11 Sept 2026, 23:18
| Source | Licence | Fetched | Link |
|---|---|---|---|
| SDCC SD-001:DP:south-dublin-county-development-plan-2022-2028 | — | 11 Sept 2026, 23:18 | open |
Designations on or near the site
- Radon risk area × 1About 1 in 20 homes in this area is likely to have high radon levels
Nearby precedents within 500 m, last 5 years
Decisions
| Reference | Decision | Decided | Units | Distance | Description |
|---|---|---|---|---|---|
| SD26B/0361W | Invalid - site notice | 17 Aug 2026 | — | 350 m | Construction of a 2 storey rear extension to existing dwelling |
| SD26B/0309W | Grant permission | 17 Aug 2026 | — | 369 m | Construction of a 32sq.m ground floor flat roof extension to the rear, providing a new utility room, extended kitchen and dining room with no.1 new rooflight; Attic conversion to the rear extending the property to two storeys to include two additional bedrooms, office space, shower room and en-suite; Two roof lights to the north facing front elevation; External insulation with brick finish to the front, side and rear facades; Ancillary site works as required to facilitate construction works. |
| SD26B/0242W | Request additional information | 14 Jul 2026 | — | 453 m | Dormer extension at existing attic level and an extension at first-floor level to facilitate the conversion of the existing three-storey, three-bedroom semi-detached dwelling into a three-storey, four-bedroom dwelling. The proposed works will include (i) modifications to part of the existing roof over the rear ground-floor kitchen area to incorporate a pitched roof, (ii) Construction of a first-floor extension with associated internal reconfiguration, (iii) Construction of a dormer extension with reconfiguration of the attic layout to provide an additional bedroom, (iv) Removal and replacement of existing rear first-floor windows, installation of a new dormer window and ground-floor bi-fold door, (v) Relocation/reuse of the existing ground-floor skylight at dormer level, and all associated site works, landscaping, drainage, and ancillary service works. |
| SD26B/0249W | Grant permission & grant retention | 2 Jul 2026 | — | 486 m | Retention permission for two Velux rooflights to the front roof slope for single-storey extension to the rear and side, widening of the existing front vehicular access, and an attic conversion for storage purposes, including a dormer window to the rear roof slope and two rooflights to the front roof slope. |
| SD26B/0197W | Grant permission | 18 Jun 2026 | — | 423 m | Conversion of existing attic space comprising of modification of existing roof structure, raising of existing gable c/w window, new access stairs, 2no. roof windows to the front and flat roof dormer to the rear. |
| SD21B/0201/EP | Refuse ext. of duration of permission | 2 Jun 2026 | — | 184 m | Construction of a two storey extension at the side and a single storey extension to the rear of existing semi-detached house; canopy at the front of the house above the main entrance and continuing over a new single storey bay window; 3 no. west facing roof lights to the rear of the house; 3 no. new west-facing roof-lights to the single storey extension to the rear of the house; 3 no. windows to the new end wall and gable; connection into existing public mains; internal reconfiguration; all with a total floor area of approx.. 49sq.m and associated site works. |
| ED26/0040 | Declared exempt | 29 May 2026 | — | 497 m | (a) Removal of 12m2 Conservatory & Construct a new 24.5m2 Ground Floor Single Storey extension to rear of the property. (b) Install external insulation to all external walls of the property. The front Facade external insulation will remain brick style finish in keeping with existing local properties. |
| SD26B/0156W | Grant permission | 28 May 2026 | — | 489 m | Amendmetns to the first floor extension previously granted planning permission Reg Ref: SD21B/0021 |
Appeals
| ACP case | Type | Outcome | Decided | Distance |
|---|---|---|---|---|
| 323123 | Planning Appeal | Granted with conditions | 25 Nov 2025 | 382 m |
| 322307 | Planning Appeal | Granted with conditions | 6 Aug 2025 | 182 m |
| 323093 | Planning Appeal | Invalid | 22 Jul 2025 | 382 m |
| 322269 | Planning Appeal | Withdrawn | 23 Apr 2025 | 382 m |
| 315182 | Planning Appeal | Granted with conditions | 12 Oct 2023 | 305 m |
| 313497 | Planning Appeal | Invalid | 5 May 2022 | 472 m |
If neighbours here have appealed before and lost, the inspector's report on that case is the single most useful thing to read.
What has happened on this file
- 18 Aug 2026 New application · observations close 22 Sept 2026
Generated from the Planning Register store; nothing was fetched live for this page. Source: national planning dataset, fetched 11 Sept 2026, 18:51. Not legal advice — confirm the deadline with South Dublin County Council before relying on it.