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Planning application

Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

Refused Windsor and Maidenhead 26/00048/CPD Cert of Lawfulness of Proposed Dev

Works: Extension Loft or dormer Small domestic

Read from the description, not a valuation. How we read the register

Refused. Only the applicant can appeal, within the statutory time limit, and a revised scheme can be submitted instead.

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.

As published by the council, reference 26/00048/CPD

Application record

Reference
26/00048/CPD
Type
Cert of Lawfulness of Proposed Dev
Status
Decided
Decision
Refused As published: Refuse
Received
8 Jan 2026
Validated
12 Jan 2026
Decided
9 Mar 2026
Ward
Bisham And Cookham
Parish
Cookham Parish
Decision by
Delegated
Postcode
SL6 9UB

Site history

Applications at this address on the Windsor and Maidenhead register

This site has had 7 applications since 2021: 4 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.

    Decided 28 Aug 2026 Prior approval
  • 26/01823/CPD Granted

    Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    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.

    Decided 29 Sep 2026 Lawful development
  • 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.

    Decided 4 Jun 2026 Prior approval
  • 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.

    Decided 3 Jul 2026 Lawful development
  • 22/00347/CPD Granted

    Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    Certificate of lawfulness to determine whether the proposed detached outbuilding is lawful.

    Decided 11 Apr 2022 Lawful development
  • 21/03469/CPD Refused

    Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    Certificate of lawfulness to determine whether the proposed detached outbuilding is lawful.

    Decided 19 Jan 2022 Lawful development

Timeline

Dates from the published record

  1. 8 Jan 2026

    Received by Windsor and Maidenhead

  2. 12 Jan 2026

    Validated

    Checked as complete and ready for consideration.

  3. 9 Mar 2026

    Decision issued: Refuse

  4. 11 Aug 2026

    Added to PlanIndex

Documents

Plans, drawings, consultee responses and the officer's report

13 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.

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Open the documents

What this refusal means

Windsor and Maidenhead refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. More in our guide to what happens after a planning decision.

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 0.3 miles

  • Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    26/01170/PDXL Submitted 11 May 2026 50 yards away

    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 docs
    Small domestic

  • Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    26/01823/CPD Submitted 24 Jul 2026 50 yards away

    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.

    Granted Lawful development Loft or dormer Windows or glazing 15 docs

  • Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    22/00347/CPD Submitted 8 Feb 2022 50 yards away

    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

    26/01822/PDXL Submitted 24 Jul 2026 50 yards away

    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 docs
    Small domestic

  • Highwood Corner Grubwood Lane Cookham Maidenhead SL6 9UB

    21/03469/CPD Submitted 24 Nov 2021 50 yards away

    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

    26/01169/CPD Submitted 11 May 2026 50 yards away

    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 docs
    Small domestic

In Windsor and Maidenhead

  • 26/02222/CPD Refused

    52 Audley Way Ascot SL5 8EF

    Certificate of lawfulness to determine whether the proposed single storey rear extension following the removal of the existing conservatory is lawful.

    Received 8 Sep, published by the council 24 Sep 2026 Lawful development
  • 26/01954/CPD Withdrawn

    Mulberry House Waltham Road Maidenhead SL6 3NH

    Certificate of lawfulness to determine whether the single storey rear extension is lawful.

    Received 7 Aug, published by the council 16 Aug 2026 Lawful development
  • 26/01856/CLU Granted

    Apple Tree Cottage And Land Adjacent To Apple Tree Cottage Paley Street Maidenhead

    Certificate of lawfulness to determine whether the existing use of the land as a residential garden incidental to the main dwelling is lawful

    Received 28 Jul, published by the council 24 Aug 2026 Lawful development
  • 26/02022/CPD Refused

    14 Church View White Waltham Maidenhead SL6 3JQ

    Certificate of lawfulness to determine whether the proposed 1no. rear dormer and alterations to fenestration are lawful

    Received 17 Aug, published by the council 2 Sep 2026 Lawful development
  • 26/01862/CLU Granted

    Holyport Pre School Holyport Youth Club Moneyrow Green Holyport Maidenhead SL6 2NA

    Certificate of lawfulness to determine whether the existing use of the site as a pre-school is lawful.

    Received 29 Jul, published by the council 4 Aug 2026 Lawful development