18 St Marks Place Windsor SL4 3BG

1. 10 Jan 2022

   Received by Windsor and Maidenhead

2. 12 Jan 2022

   Validated

   Checked as complete and ready for consideration.

3. 28 Mar 2022

   Decision issued: Permitted Development

4. 16 Aug 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

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.

More on lawful development applications in our guide

• 17 Queens Road Windsor SL4 3BQ

  26/00873/FULL Submitted 7 Apr 2026 21m away

  Single storey side/rear extension

  Granted Full applications Extension 10 docs
  Small domestic

• 17 Queens Road Windsor SL4 3BQ

  23/00646/VAR Submitted 14 Mar 2023 21m away

  Variation (under Section 73) of planning permission 20/00908/FULL to vary the wording of Condition 1 (Commencement - Full Application 3 Years).

  Withdrawn Amendments 6 docs

• 21 Queens Road Windsor SL4 3BQ

  26/01662/FULL Submitted 8 Jul 2026 26m away

  71% historically approved · decision due ~1 Oct

  Single storey rear extension and alterations to fenestration.

  Awaiting decision Full applications Extension Windows or glazing 14 docs
  Small domestic

• 21 Queens Road Windsor SL4 3BQ

  21/02952/FULL Submitted 4 Oct 2021 27m away

  Single storey side extension, x2 rear L-shaped dormer and alterations to fenestration.

  Refused Full applications Extension Loft or dormer +1 18 docs
  Small domestic

• 6 St Marks Place Windsor SL4 3BG

  21/01172/FULL Submitted 14 Apr 2021 29m away

  Single storey rear extension and 3 No. front rooflights and 2 No. rear dormers to facilitate a loft conversion

  Granted Full applications Extension Loft or dormer 16 docs
  Small domestic

• 17 St Marks Place Windsor SL4 3BG

  21/03447/FULL Submitted 22 Nov 2021 31m away

  x2 front rooflights and x2 rear dormers.

  Granted Full applications Loft or dormer 12 docs

• 26/01615/CLU Granted

  Riding Court Farm Riding Court Riding Court Road Datchet Slough SL3 9JT

  Certificate of lawfulness to determine whether the existing units 'JKL' (use class B8) used for storage and distribution; unit 'AB' (use class B8) used for hiring, maintaining, and cleaning concrete screed and machinery and 'storage yard 2' (use class B8) used for the storage of scaffolding is lawful.

  1 Jul 2026 Lawful development
• 26/01581/CLD Granted

  The George Public House The Brewhouse The Green Holyport Road Holyport Maidenhead

  Certificate of lawfulness to determine whether the existing bollard is lawful.

  26 Jun 2026 Lawful development
• 26/01389/CLD Granted

  Redwood 88 Bolton Road Windsor SL4 3JG

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

  5 Jun 2026 Lawful development
• 26/02060/CPD Awaiting decision

  13 Orchard Grove Maidenhead SL6 6DR

  Certificate of lawfulness to determine whether the proposed hip to gable roof alteration, 2 no. front rooflights and 1 no. rear dormer is lawful.

  20 Aug 2026 Lawful development
• 26/01564/CPD Refused

  Long Chase Farm Ascot Road Holyport Maidenhead SL6 3LA

  Rear two storey extension to Long Chase Farmhouse under Class A of Part 1 of the GPDO 2015,As Amended.

  25 Jun 2026 Lawful development