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Planning application

Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

Refused Windsor and Maidenhead 26/01326/NMA Non-material Amendment

Works: Loft or dormer Roofing Windows or glazing

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

Proposal

Non material amendments to planning permission 24/00494/FULL for changes to ground floor roof overhangs to be supported by beams and posts or with additional posts, alterations to fenestration on ground and first floor and additional windows to gable ends in roof-space, and insertion of rooflight in flat-top roof. Alterations to chimneys and 3no additional flues.

As published by the council, reference 26/01326/NMA

Application record

Reference
26/01326/NMA
Type
Non-material Amendment
Status
Decided
Decision
Refused As published: Refuse
Received
28 May 2026
Validated
28 May 2026
Decided
23 Jun 2026
Ward
Bisham And Cookham
Parish
Cookham Parish
Decision by
Delegated
Postcode
SL6 9AE

Site history

Applications at this address on the Windsor and Maidenhead register

This site has had 10 applications since 2022: 4 approved, 2 refused.

  • 26/02161/NMA Awaiting decision

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Non material amendments to planning permission 24/01755/FULL for alterations to the roof, roof overhang, fenestration and external finish.

    Submitted 2 Sep 2026 Amendments
  • 26/00579/CONDIT Granted

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Details required by Condition 6 (BNG Calculations) and Condition 7 (Biodiversity Enhancements) of planning permission 24/00494/FULL for a replacement detached dwelling with solar panels.

    Decided 1 Apr 2026 Conditions
  • 24/02271/VAR Withdrawn

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Variation (under Section 73) of Condition 13 to substitute those plans approved under 24/00494/FULL for the Replacement detached dwelling with solar panels with amended plans.

    Decided 5 Nov 2024 Amendments
  • 23/02120/TPO Granted

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    As per submitted schedule, but with the following amendments: no works to T2 Oak, T29 Sycamore, T31 Sycamore and T32 Sycamore, and no works to T3 Oak other than pruning to give 2m clearance to the roof of the existing wooden garage and up to 5.2m clearance over the shared driveway east of the wooden access gate. (012/1984/TPO)

    Decided 17 Nov 2023 Trees
  • 23/02029/PDXL Granted

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Single storey rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.00m.

    Decided 18 Sep 2023 Prior approval
  • 23/02004/CPD Withdrawn

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Certificate of lawfulness to determine whether the proposed single storey side extension, loft conversion with 2 no. rooflights, rear dormer and 3 no. outbuildings following demolition of existing garage is lawful.

    Decided 30 Oct 2023 Lawful development
  • 23/01793/CPD Refused

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Certificate of lawfulness to determine whether the proposed single storey side extension, 1no. rear dormer, 2no. detached outbuildings and a replacement detached triple garage with office ancillary to the main dwelling is lawful.

    Decided 3 Aug 2023 Lawful development
  • 23/01789/PDXL Withdrawn

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    Single storey rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.00m.

    Decided 1 Sep 2023 Prior approval
  • 22/03414/TPO Granted

    Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    T3 - Beech - Crown reduction by 9m leaving a final height of 14m (012/1984/TPO).

    Decided 29 Mar 2023 Trees

Timeline

Dates from the published record

  1. 28 May 2026

    Received by Windsor and Maidenhead

  2. 23 Jun 2026

    Decision issued: Refuse

  3. 25 Jul 2026

    Added to PlanIndex

Documents

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

10 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.

Watch members (£5 a month) open the document list from here.

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 amendment applications

An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.

Nearby applications

Within 500 metres

  • Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    26/00579/CONDIT Submitted 2 Mar 2026 0m away

    Details required by Condition 6 (BNG Calculations) and Condition 7 (Biodiversity Enhancements) of planning permission 24/00494/FULL for a replacement detached dwelling with solar panels.

    Granted Conditions New dwelling 7 docs
    Domestic

  • Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    23/01789/PDXL Submitted 21 Jul 2023 2m away

    Single storey rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.00m.

    Withdrawn Prior approval Extension 10 docs
    Small domestic

  • Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    23/02029/PDXL Submitted 15 Aug 2023 2m away

    Single storey rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.00m.

    Granted Prior approval Extension 12 docs
    Small domestic

  • Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    26/02161/NMA Submitted 2 Sep 2026 2m away

    71% historically approved · decision due ~28 Oct

    Non material amendments to planning permission 24/01755/FULL for alterations to the roof, roof overhang, fenestration and external finish.

    Awaiting decision Amendments Windows or glazing 5 docs

  • Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    23/02004/CPD Submitted 15 Aug 2023 2m away

    Certificate of lawfulness to determine whether the proposed single storey side extension, loft conversion with 2 no. rooflights, rear dormer and 3 no. outbuildings following demolition of existing garage is lawful.

    Withdrawn Lawful development Extension Loft or dormer +1 13 docs
    Small domestic

  • Round Copse Alleyns Lane Cookham Maidenhead SL6 9AE

    24/02271/VAR Submitted 19 Sep 2024 3m away

    Variation (under Section 73) of Condition 13 to substitute those plans approved under 24/00494/FULL for the Replacement detached dwelling with solar panels with amended plans.

    Withdrawn Amendments New dwelling 20 docs
    Domestic

In Windsor and Maidenhead

  • 26/01860/VAR Refused

    72 - 72B High Street Sunninghill Ascot

    Variation (under Section 73A) of planning permission 22/01291/FULL without complying with Condition 8 (Electric Vehicle Charging Point).

    Received 29 Jul, published by the council 4 Aug 2026 Amendments
  • 26/02252/VAR Awaiting decision

    18 Forlease Drive Maidenhead SL6 1UD

    Variation (under Section 73a) of Condition 4 to substitute those plans approved under 26/00518/FULL for the Garage conversion and single storey front/side extension with amended plans.

    Received 11 Sep, published by the council 18 Sep 2026 Amendments
  • 25/03312/VAR Granted

    Land South of Bray Lake Windsor Road Maidenhead

    Variation (under Section 73) of Condition 29 (Approved Plans) to substitute those plans approved under 22/01791/OUT for an outline application for access, appearance, layout and scale only to be considered at this stage with all other matters to be reserved for the construction of x99 dwellings with associated vehicular and pedestrian access, car parking, drainage works and open space with amended plans.

    Received 15 Dec, published by the council 27 Jul 2026 Amendments
  • 26/02137/NMA Refused

    Woodhaven 8 Dawnay Close Ascot SL5 7PQ

    Non material amendments to planning permission 23/02519/FULL as per supporting document.

    Received 28 Aug, published by the council 8 Sep 2026 Amendments
  • 26/01975/VAR Withdrawn

    2 And LAnd At 2 Westfield Road Maidenhead SL6 5AU

    Variation (under Section 73) of planning permission 25/01013/FULL to remove Condition 15 (BNG).

    Received 10 Aug, published by the council 16 Aug 2026 Amendments