Planning application
26/01823/CPD
Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB
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
Timeline
Dates from the published record
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24 Jul 2026
Received by Windsor and Maidenhead
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31 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Windsor and Maidenhead for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
About lawful development applications
How this application type works
A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.
Nearby applications
Within 500 metres
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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.
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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.
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22/03007/PDXL Granted
Pheasant Cottage Hockett Lane Cookham Maidenhead SL6 9UF
Single storey rear extension no greater than 8m in depth, 4m high with an eaves height of 2.49m.
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22/02572/FULL Granted
Imbers Grubwood Lane Cookham Maidenhead SL6 9UD
Widening of the existing driveway and access and new entrance gates.
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26/00835/FULL Refused
Southwood Stubbles Lane Cookham Maidenhead SL6 9PX
Part single, part two-storey, side/rear extension and raising of one existing chimney.
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22/02843/FULL Granted
Fernie Cottage Grubwood Lane Cookham Maidenhead SL6 9UD
Garage conversion, part two storey, part first floor rear extension and alterations to fenestration.
Other lawful development applications
In Windsor and Maidenhead
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26/01836/CPD Awaiting decision
Rivendale 22A Gloucester Drive Wraysbury Staines TW18 4TY
Certificate of lawfulness to determine whether the proposed conversion of the existing garage into habitable space is lawful.
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26/01528/CPD Granted
Foxley Manor Forest Green Road Holyport Maidenhead SL6 2NW
Certificate of lawfulness to determine whether the proposed erection of an outbuilding is lawful.
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26/01532/CPD Granted
72 Highway Avenue Maidenhead SL6 5AQ
Certificate of Lawfulness to determine whether the proposed rear dormer roof extension and associated internal alterations to enlarge the existing loft accommodation is lawful.
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26/01772/CPD Granted
18 Broken Furlong Eton Windsor SL4 6PD
Certificate of lawfulness to determine whether the proposed erection of a single storey rear detached annex to be used incidental with the host dwelling is lawful.
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26/01711/CPD Granted
7 Keppel Spur Old Windsor Windsor SL4 2LU
Certificate of lawfulness to determine whether the proposed 1no. rear dormer, 2no. front rooflights and 1no. window to the side gable to accommodate a loft conversion are lawful.