163 Arthur Road Windsor SL4 1RZ Data via plota.co.uk

26/02561/CPD - Cert of Lawfulness of Proposed Dev Awaiting decision
Extensions & alterations

Proposal

Certificate of lawfulness to determine whether the proposed rear L shaped dormer with Juliette balcony is lawful. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
20 Oct 2026
Decision
Expected by 14 Dec 2026

Under consideration

No decision has been issued yet. Plota predicts a decision around 12 Dec 2026, from Windsor and Maidenhead's recent extensions.

Documents 3

Application forms 2

PDF Application form redacted Application Forms · 20 Oct 2026 View ↗ PDF Cil form 1 CIL Documents · 20 Oct 2026 View ↗

Other documents 1

PDF History log Property History · 21 Oct 2026 View ↗

All documents on the council site ↗

Site constraints 6

Flood zone 3, rivers and sea
High chance: a 1 in 100 or greater annual chance from rivers, or 1 in 200 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
Air quality management area: Windsor AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
Also on the record
Radon affected area, class 2; 2 listed buildings within 150 m; National infrastructure project 1808 m away: M4 Junctions 3 to 12 Smart Motorway; Inside the Windsor built-up area.
Not affected
Not green belt · No scheduled monument at the site

Checked on 23 October 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

Building

Floor area115 m² (1,238 sq ft)
Energy ratingE (54 out of 100), could reach C
PropertyMid-terrace house, 5 habitable rooms
BuiltBefore 1900
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in June 2020, the latest held for this property. The building may have changed since. View the certificate

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Other new applications on this street

28 Aug 2026Approved

195 Arthur Road Windsor SL4 1RZ

Single storey rear extension

26/01840/FULL
20 May 2026Approved

Laithwaites 121 Arthur Road Windsor SL4 1RU

Replacement shopfront and addition of a single storey side infill extension with...

26/01184/FULL
20 May 2026Approved

84 Arthur Road Windsor SL4 1RX

2no. front rooflights and a rear second floor roof extension.

26/01245/FULL

Nearby new applications

22 Oct 2026Pending

Flaxman 50 Peascod Street Windsor SL4 1DE

Installation of a roller shutter (Retrospective)

26/02399/FULL
20 Oct 2026Pending

163 Arthur Road Windsor SL4 1RZ

Single storey rear extension.

26/02560/FULL
20 Oct 2026Pending

White Lilies White Lilies Island Mill Lane Windsor SL4 5JH

(T3) - Willow x 2- Remove trunk growth over top of cypress hedge by 1-2m, leavin...

26/02530/TCA
20 Oct 2026Pending

White Lilies White Lilies Island Mill Lane Windsor SL4 5JH

(T3) - Willow x 2- Remove trunk growth over top of cypress hedge by 1-2m, leavin...

26/02546/TPO
19 Oct 2026Pending

14 Alexandra Road Windsor SL4 1HN

Alterations to fenestration to the rear and side elevation.

26/02506/FULL
14 Oct 2026Pending

64 Peascod Street Windsor SL4 1DE

Consent to display 1 no. non-illuminated fascia sign.

26/02416/ADV

Important details

Council
Windsor and Maidenhead
Application type
Cert of Lawfulness of Proposed Dev
Postcode
SL4 1RZ
Received
20 Oct 2026
Validated
20 Oct 2026
Ward
Eton And Castle
Parish
Windsor Unparished
Case officer
Show
Target decision
14 Dec 2026
Applicant
Show
Agent
Ellen Cullen

Decision outlook

Day 8 of the 56-day target. Windsor and Maidenhead usually decides extensions by day 53.

Day 848 days to the 56-day target
76%decided within 8 weeks
75%approved
862decided in the last year

Plota live figures for extensions decided by Windsor and Maidenhead in the last twelve months, from validation. Windsor and Maidenhead decision record →

Consultation & key dates

Alt. reference
PP-15310179
Planning Portal ref
PP-15310179
Statutory expiry
14 Dec 2026
Env. assessment
No

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025 Approved
207 Arthur Road Windsor SL4 1RZ
Single storey rear extension, 1 no. rear Juliet balcony, 1no. rear dormer, alterations to…
25/02033/FULL
2022 Approved
120 Arthur Road Windsor SL4 1RY
x1 rear dormer and installation of x1 juliet balcony in the existing rear dormer.
22/00303/FULL
2022 Approved
6 Duke Street Windsor SL4 1SA
Single storey side/rear extension, replacement roof over the existing single storey rear…
22/00995/FULL
2022 Approved
122 Arthur Road Windsor SL4 1RY
2no. front rooflights and an L-Shaped rear dormer with Juliet balcony.
22/00263/FULL
2021 Approved
Jester House 143 Arthur Road Windsor SL4 1RU
New front boundary treatment consisting of a dwarf wall with railings and gate.
21/03486/FULL
2021 Refused
120 Arthur Road Windsor SL4 1RY
Second floor rear extension to enlarge the existing accommodation within the roof space.
21/03318/FULL
2021 Approved
120 Arthur Road Windsor SL4 1RY
Single storey side/rear extension and x1 Juliet balcony on the second floor rear elevatio…
21/03317/FULL
2021 Approved
160 Oxford Road Windsor SL4 5DU
Single storey side/rear extension and alterations to fenestration.
21/00575/FULL
2020 Approved
118 Arthur Road Windsor SL4 1RX
Single storey rear extension, following demolition of the existing single storey rear ele…
20/00909/FULL
2020 Approved
205 Arthur Road Windsor SL4 1RZ
Single storey rear extension.
20/01159/FULL
2020 Approved
144 Arthur Road Windsor SL4 1RY
Single storey rear extension
20/00181/FULL
2019 Approved
154 Arthur Road Windsor SL4 1RY
Single storey rear extension.
19/03252/FULL
2019 Approved
152 Arthur Road Windsor SL4 1RY
Single storey rear extension.
19/03011/FULL
2019 Approved
198 Oxford Road Windsor SL4 5DU
Single storey rear extension and hip to gable loft conversion with x2 front rooflights, x…
19/02904/FULL
2019 Approved
118 Arthur Road Windsor SL4 1RX
Loft conversion with 2no. rear dormers, 1no. rear rooflight and 2no. front rooflights (Re…
19/02746/FULL
2019 Refused
50 Vansittart Road Windsor SL4 5BY
Two storey rear extension with Juliet balcony.
19/02600/FULL
2019 Approved
188 Oxford Road Windsor SL4 5DU
Single story rear extension, x1 rear dormer and removal of the existing first floor side…
19/01565/FULL
2019 Approved
50 Vansittart Road Windsor SL4 5BY
Single storey rear extension no greater than 6m in depth, 3.85m high with an eaves height…
19/01611/PDXL
2019 Approved
201 Arthur Road Windsor SL4 1RZ
Single storey rear extension.
19/01143/FULL
2018 Approved
138 Arthur Road Windsor SL4 1RY
Single storey rear extension following removal of existing kitchen and conservatory exten…
18/02792/FULL
2016 Approved
1 Windsor Business Centre Vansittart Estate Windsor SL4 1SP
New glazed wall to ground and first floor, new access and removal or external staircase
16/02158/FULL
2016 Approved
176 Oxford Road Windsor SL4 5DU
Single storey rear extension and rear extension to roof to faciliate conversion of loft i…
16/01141/FULL
2016 Approved
190 Oxford Road Windsor SL4 5DU
Single storey side and rear extension and extension to roof to form second floor habitabl…
16/01746/FULL
2016 Approved
184 Oxford Road Windsor SL4 5DU
Single storey rear extension with amendments to fenestration.
16/01182/FULL
2016 Approved
202 Oxford Road Windsor SL4 5DU
Single storey rear extension, roof lantern and 2 x new ground floor side windows
16/00062/FULL
Windsor and Maidenhead
Planning Authority Score
5.3/10
Average
#135 of 296 councils
Relevant to this application:
Householder decisions

Windsor and Maidenhead is faster than most councils at deciding householder applications, ranking #82 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Windsor and Maidenhead is also one of the strictest councils - it refuses more householder applications than almost any other, with only 74% approved vs 90% nationally.

One of the strictest councils
only 74% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Windsor and Maidenhead decision statistics
Based on MHCLG data, the year to March 2026
72%
Overall approval rate
Below avg (87%) #293 of 296
74%
Householder approved
Below avg (90%) #294 of 296
75%
Decided in 8 weeks
Above avg (63%) #82 of 296
28%
Extended time limit
Below avg (41%) #47 of 296
44%
Minor dwellings approved
156 decided (1-9 homes)
96%
Major dwellings approved
27 decided (10+ homes)
64%
Change of use approved
25 decided
1,530
Total decisions
434 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.