15 Castle Avenue Datchet Slough SL3 9BA

1. 9 Sep 2026

   Received by Windsor and Maidenhead

2. 12 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 4 November 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 56 days over the applications it decided in the last year.

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.

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.

• 133 Slough Road Datchet Slough SL3 9AE

  22/02312/NMA Submitted 22 Aug 2022 50 yards away

  Non material amendments to planning permission 21/03671 for amendments to the design of the approved detached garage with room above.

  Refused Amendments 8 docs

• Land At 16 Castle Avenue Datchet Slough

  21/00211/OUT Submitted 27 Jan 2021 50 yards away

  Outline application for 1no. three bedroom detached dwelling with all matters reserved.

  Refused Outline New dwelling 21 docs
  Domestic

• 133 Slough Road Datchet Slough SL3 9AE

  23/01052/FULL Submitted 28 Apr 2023 50 yards away

  Two storey front/side extension, side canopy, thermal insulation to the existing walls and alterations to the external finish and fenestration following the demolition of the existing garage and store.

  Granted Full applications Extension Demolition +1 21 docs

• 10 Castle Avenue Datchet Slough SL3 9BA

  22/01288/CPD Submitted 12 May 2022 100 yards away

  Certificate of lawfulness to determine whether the alterations and extension to first floor roof space are lawful

  Granted Lawful development Extension 10 docs

• 135 Slough Road Datchet Slough SL3 9AE

  26/00377/FULL Submitted 12 Feb 2026 100 yards away

  Single storey side extension and alterations to fenestration

  Granted Full applications Extension Windows or glazing 14 docs
  Small domestic

• 10 Castle Avenue Datchet Slough SL3 9BA

  21/01678/FULL Submitted 1 Jun 2021 100 yards away

  Single storey side/rear extension, hip to gable with x2 front dormers, x1 rear dormer, x1 new door to side elevation, x1 new rooflight to rear extension and alteration to fenestration.

  Withdrawn Full applications Extension Loft or dormer +1 16 docs
  Small domestic

• 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