Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Refused on 9 March 2026
Council decision: RefuseDelegated (officer decision)
Boundary © HM Land Registry, © Ordnance Survey · details
This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.
Proposal
Certificate of lawfulness to determine whether the proposed garage conversion, single storey side extension, single storey rear extension, 1 no. front dormer and 1 no. rear dormer to facilitate a loft conversion is lawful.
- Received
- 8 January 2026
- Decision level
- Delegated (officer decision)
- Ward
- Bisham And Cookham
- ReceivedReceived8 Jan
- ValidatedValidated12 Jan
- Consult.Consultation
- TargetTarget Date9 Mar
- DecidedDecided9 Mar
Decided in 56 days (council typically 56)
About this application
This is an outline application for a single storey rear extension at Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB. Windsor has handled 644 applications of this type. This one was decided in 60 days, 4 days longer than Windsor's typical decision time. The site is in a conservation area. There have been 4 other applications at this address. In the past year there have been 129 applications across Bisham And Cookham. We hold 2,121 applications in total for the SL6 postcode area.
67% of outline applications at Royal Borough of Windsor and Maidenhead were approved. Across all application types, the council typically decides in about 8 weeks (median).
Based on decided applications received in the last 3 years.See what's approved near your address
Application details
- Postcode
- SL6 9UB
- Application type
- Cert of Lawfulness of Proposed Dev
- Scale / size
- Small
- Parish
- Cookham Parish
Planning application dates
- Date validated
- 12 January 2026
- Target decision date
- 9 March 2026
Applicant and agent
- Agent address
- TRA Studio 34C Panorama Road Poole BH13 7R
Planning decision
- Statutory period
- 56 days
Additional information
- Planning Portal ID
- PP-14594638
- Documents
- 13
Site constraints
Designations that overlap or adjoin the site outline.
- Green belt: Windsor and Maidenhead
- Ancient woodlandNext to the site
- Flood zone 1: Low probability (rivers and sea)
Not published by this council, so not checked: conservation areas, Article 4 directions and tree preservation orders. Ask the council if these matter.
Also checked, none recorded (19)
flood storage areas, listed buildings, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, national nature reserves, local nature reserves, heritage coasts and brownfield registers.
A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.
Data © Crown copyright and others · sources and licences
Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.
© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.
© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.
Contains Ordnance Survey data © Crown copyright and database right 2026.
Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.
Planning history at this site
4 other applications at this property, newest first.
- 202624 Jul
Single storey side/rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.80m.
PendingApplication26/01822/PDXL - 202624 Jul
Certificate of lawfulness to determine whether the proposed garage conversion, alterations to fenestration, 1…
PendingCert of Lawfulness of Proposed Dev26/01823/CPD - 202611 May
Single storey rear extension no greater than 8.00m in depth, 3.84m high with an eaves height of 2.78m.
PendingApplication26/01170/PDXL - 202611 May
Certificate of lawfulness to determine whether the proposed garage conversion, single storey side/rear…
PendingApplication26/01169/CPD
Source: Windsor
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Around this site
Nearby applications
- Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB26/01823/CPD · OutlineAwaiting decision0.0 mi
- Southwood Stubbles Lane Cookham Maidenhead SL6 9PX23/00785/FULL · FullWithdrawn0.2 mi
- Robin Hill Hockett Lane Cookham Maidenhead SL6 9UF26/00656/CONDIT · ConditionsAwaiting decision0.2 mi
- May Cottage Grubwood Lane Cookham Maidenhead SL6 9UD25/03029/CPD · OutlineApproved0.2 mi
- May Cottage Grubwood Lane Cookham Maidenhead SL6 9UD26/01042/CPD · OutlineAwaiting decision0.2 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Lynford homesVerifiedBuckinghamshireNew Builds9.4 mi
- Powerlink ElectricalElectrician0.6 mi
- SM Butler LtdElectrician1.0 mi
- Contact Electrical SolutionsElectrician1.0 mi
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