St Oswalds Winter Hill Cookham Maidenhead SL6 9TT Data via plota.co.uk

26/01713/FULL - Full Awaiting decision
Extensions & alterations

Proposal

2no. replacement rear dormers and alterations to fenestration to the ground floor side elevation. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
14 Jul 2026
✓
Validated
27 Jul 2026
Decision
Expected by 7 Oct 2026

Under consideration

No decision has been issued yet. Plota predicted a decision around 9 Oct 2026; it is now day 74.

The consultation period closed on 24 Aug 2026.

Documents 5

Statements & assessments 1

PDF Planning, design and access statement Planning Statement · 27 Jul 2026 View ↗

Application forms 2

PDF Application form redacted Application Forms · 14 Jul 2026 View ↗ PDF Cil form 1 CIL Documents · 14 Jul 2026 View ↗

Consultation & comments 1

PDF Neighbour notification list Neighbour Notification List · 28 Jul 2026 View ↗

Other documents 1

PDF History log Property History · 27 Jul 2026 View ↗

All documents on the council site ↗

Site constraints 9

Green belt: London
Inappropriate development needs very special circumstances.
Green belt policy allows a short list of exceptions, such as limited extensions and replacement buildings. Anything else needs very special circumstances that clearly outweigh the harm. Some green belt land can count as grey belt, where it does not strongly serve the green belt's purposes. The council decides this in its green belt assessment or on each application, so we do not mark it here.
Read the government guidance ↗
Priority habitat: Traditional orchard
A habitat of principal importance. It shapes the ecology work and the biodiversity net gain a scheme has to show.
Special area of conservation 100 m away: Chilterns Beechwoods
Work nearby can need a habitats assessment.
Harm to a protected site is only accepted where there is no alternative and an overriding public interest.
Habitat network: Traditional orchards
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
SSSI 100 m away: Bisham Woods SSSI
Natural England may need consulting, depending on what is proposed.
Sites of special scientific interest are the best wildlife and geological sites in the country. Development likely to harm one is rarely permitted.
Also on the record
Radon affected area, class 2; Inside the Cookham built-up area; Open access land 17 m away: Access Land - Combined Open Country, Registered Common Land and Section 16 Dedicated Land. MoD Byelaw, Section 28 Exclusions, Racecourses and Aerodromes and ECP Margin have been removed.; Natural England's Provisional ALC map (1:250,000, 1970s) had this area as grade 3, but it predates the buildings here and the current map does not class it as farmland.
Not affected
Outside flood zones 2 and 3 · No listed building at the site · No scheduled monument at the site

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, 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.

Sales history 1

Last sold for £775,000 in November 2013. Detached house, freehold.

1 November 2013£775,000

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area199 m² (2,142 sq ft)
Energy ratingB (85 out of 100)
PropertyDetached house
Built2016
HeatingBoiler and radiators, mains gas
WallsAverage thermal transmittance 0.18 W/m²K

From the energy performance certificate lodged in September 2016, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Windsor and Maidenhead
Application type
Full
Postcode
SL6 9TT
Received
14 Jul 2026
Validated
27 Jul 2026
Ward
Bisham And Cookham
Parish
Cookham Parish
Case officer
Show
Target decision
7 Oct 2026
Applicant
Show
Agent
Show

Decision outlook

Day 74, past the statutory target. 95% of extensions in Windsor and Maidenhead are decided within thirteen weeks, which runs to 26 Oct 2026; extensions of time are common, and the council need not decide on the day. Last seen undecided on 7 Oct 2026.

Day 7418 days past the 56-day target
77%decided within 8 weeks
75%approved
835decided 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-15067614
Planning Portal ref
PP-15067614
Comments by
24 Aug 2026
Statutory expiry
20 Sept 2026
Env. assessment
No

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Withdrawn
Dove Cote Winter Hill Cookham Maidenhead SL6 9TU
Certificate of lawfulness to determine whether the existing use as a residential annexe t…
25/02989/CLU
2024 Approved
Dove Cote Winter Hill Cookham Maidenhead SL6 9TU
Certificate of lawfulness to determine whether the construction of basement in detached o…
24/02967/CLD
2024 Approved
Welkin Hurst Winter Hill Cookham Maidenhead SL6 9TT
3 no. bay windows and alteration to fenestration
24/00537/FULL
2022 Approved
Hornbeams Winter Hill Cookham Maidenhead SL6 9TT
Variation (under Section 73) of conditions 2 (materials) and 3 (approved plans) to change…
22/00446/VAR
2021 Approved
White House Winter Hill Cookham Maidenhead SL6 9TU
Details required by condition 4 (lighting scheme) of planning permission 20/00393/FULL fo…
21/02043/CONDIT
2021 Approved
Hornbeams Winter Hill Cookham Maidenhead SL6 9TT
First floor side extension, alterations to fenestration and to external finishes on the g…
21/01045/FULL
2020 Approved
White House Winter Hill Cookham Maidenhead SL6 9TU
Enlargement of the existing driveway and new boundary treatment with x2 vehicular access…
20/02601/FULL
2020 Approved
White House Winter Hill Cookham Maidenhead SL6 9TU
Details required by condition 3 (licence for development) of planning permission 20/00393…
20/02212/CONDIT
2020 Approved
White House Winter Hill Cookham Maidenhead SL6 9TU
Details required by condition 5 (bird boxes) of planning permission 20/00393 for a single…
20/01733/CONDIT
2020 Approved
White House Winter Hill Cookham Maidenhead SL6 9TU
Single storey front/side/rear extension with integrated garage, 2 No. new rear dormers, a…
20/00393/FULL
2020 Approved
Gate House Winter Hill Cookham Maidenhead SL6 9TT
Two storey side extension with front and rear dormer and replacement garage following the…
20/00381/FULL
2019 Approved
Gate House Winter Hill Cookham Maidenhead SL6 9TT
Certificate of lawfulness to determine whether the proposed single storey rear extension…
19/01121/CPD
2019 Approved
Gate House Winter Hill Cookham Maidenhead SL6 9TT
Two storey side extension with front and rear dormer and replacement garage following the…
19/00107/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

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

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.