Planning application
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Works: Loft or dormer Windows or glazing
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Certificate of lawfulness to determine whether the proposed garage conversion, alterations to fenestration, 1 no. front dormer and 1 no. rear dormer to facilitate a loft conversion is lawful.
As published by the council, reference 26/01823/CPD
Application record
- Reference
- 26/01823/CPD
- Type
- Cert of Lawfulness of Proposed Dev
- Status
- Awaiting decision
- Received
- 24 Jul 2026
- Validated
- 24 Jul 2026
- Ward
- Bisham And Cookham
- Parish
- Cookham Parish
- Postcode
- SL6 9UB
Site history
Applications at this address on the Windsor and Maidenhead register
This site has had 7 applications since 2021: 3 approved, 3 refused.
-
26/01822/PDXL Granted
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Single storey side/rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.80m.
-
26/01170/PDXL Granted
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Single storey rear extension no greater than 8.00m in depth, 3.84m high with an eaves height of 2.78m.
-
26/01169/CPD Refused
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Certificate of lawfulness to determine whether the proposed garage conversion, single storey side/rear extension, 1no. dormer to north and 1no. dormer to south elevation and alterations to fenestration are lawful.
-
26/00048/CPD Refused
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
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.
-
22/00347/CPD Granted
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Certificate of lawfulness to determine whether the proposed detached outbuilding is lawful.
-
21/03469/CPD Refused
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Certificate of lawfulness to determine whether the proposed detached outbuilding is lawful.
Timeline
Dates from the published record
-
24 Jul 2026
Received by Windsor and Maidenhead
-
31 Jul 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 18 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
Windsor and Maidenhead took a median of 55 days over the applications it decided in the last year.
Documents
Plans, drawings, consultee responses and the officer's report
12 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Trade members open them from here.
Open the documentsWhat happens while it is decided
This application is with Windsor and Maidenhead for determination, against a statutory target of eight weeks. Over the last year Windsor and Maidenhead decided lawful development applications in a median of 50 days. More in our guide to how long planning decisions take.
About lawful development applications
A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Certificate of lawfulness to determine whether the proposed detached outbuilding is lawful.
Granted Lawful development 7 docs -
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Certificate of lawfulness to determine whether the proposed detached outbuilding is lawful.
Refused Lawful development 7 docs -
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Single storey rear extension no greater than 8.00m in depth, 3.84m high with an eaves height of 2.78m.
Granted Prior approval Extension 15 docsSmall domestic -
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
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.
Refused Lawful development Extension Loft or dormer 13 docsSmall domestic -
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Single storey side/rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.80m.
Granted Prior approval Extension 16 docsSmall domestic -
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
Certificate of lawfulness to determine whether the proposed garage conversion, single storey side/rear extension, 1no. dormer to north and 1no. dormer to south elevation and alterations to fenestration are lawful.
Refused Lawful development Extension Loft or dormer +1 14 docsSmall domestic
Other lawful development applications
In Windsor and Maidenhead
-
26/01743/CPD Refused
1 Aston Mead Windsor SL4 5PW
Certificate of lawfulness to determine whether the proposed replacement single storey rear extension is lawful.
-
26/01828/CPU Granted
Concorde Park Concorde Road Maidenhead SL6 4FJ
Certificate of lawfulness to determine whether a private hire operators licence for taxi services is lawful.
-
26/01853/CPU Granted
20 Craufurd Rise Maidenhead SL6 7LS
Certificate of lawfulness to determine whether the proposed use of a room on the ground floor as private hire operators licence is lawful.
-
26/01781/CPD Refused
163 Arthur Road Windsor SL4 1RZ
Certificate of lawfulness to determine whether the proposed rear L shaped dormer with Juliet balcony and new air source heat pump are lawful.
-
26/01553/CLU Granted
64 Priors Way Maidenhead SL6 2EN
Certificate of lawfulness to determine whether the existing use of building as self-contained residential dwelling as per details set out in Statutory Declaration is lawful.