12 Chester Street London SW1X 7BB

This site has had 5 applications since 2025: 3 approved, 0 refused.

• 26/02886/LBC Awaiting decision

  12 Chester Street London SW1X 7BB

  Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new; and alterations to French door width at rear first floor level.

  Submitted 1 May 2026 Heritage and listed buildings
• 26/00535/NMA Granted

  12 Chester Street London SW1X 7BB

  Amendment to planning permission dated 24th July 2025 (RN 24/05883/FULL) for the Excavation of a new basement level. Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new; NAMELY to amend the description of development to omit 'Excavation of a new basement level'; amended description of development to read as follows: 'Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new'.

  Decided 16 Mar 2026 Amendments
• 25/09271/FULL Granted

  12 Chester Street London SW1X 7BB

  Installation of air conditioning units within an acoustic enclosure at roof level and replacement of the existing lead flat roof with a new lead flat roof.

  Decided 8 May 2026 Full applications
• 25/09272/LBC Granted

  12 Chester Street London SW1X 7BB

  Installation of air conditioning units within an acoustic enclosure at roof level and replacement of the existing lead flat roof with a new lead flat roof.

  Decided 8 May 2026 Heritage and listed buildings

1. 9 Mar 2026

   Received by Westminster

2. 21 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 4 May 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Westminster took a median of 66 days over the applications it decided in the last year.

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided full applications in a median of 91 days. More in our guide to how long planning decisions take.

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

• 12 Chester Street London SW1X 7BB

  26/02886/LBC Submitted 1 May 2026 50 yards away

  90% historically approved · decision due ~26 Jun

  Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new; and alterations to French door width at rear first floor level.

  Awaiting decision Heritage and listed buildings Extension Loft or dormer +1 12 docs

• 12 Chester Street London SW1X 7BB

  25/09272/LBC Submitted 22 Dec 2025 50 yards away

  Installation of air conditioning units within an acoustic enclosure at roof level and replacement of the existing lead flat roof with a new lead flat roof.

  Granted Heritage and listed buildings 17 docs

• 12 Chester Street London SW1X 7BB

  26/00535/NMA Submitted 29 Jan 2026 50 yards away

  Amendment to planning permission dated 24th July 2025 (RN 24/05883/FULL) for the Excavation of a new basement level. Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new; NAMELY to amend the description of development to omit 'Excavation of a new basement level'; amended description of development to read as follows: 'Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new'.

  Granted Amendments Extension Loft or dormer +1 8 docs

• 12 Chester Street London SW1X 7BB

  25/09271/FULL Submitted 22 Dec 2025 50 yards away

  Installation of air conditioning units within an acoustic enclosure at roof level and replacement of the existing lead flat roof with a new lead flat roof.

  Granted Full applications 22 docs

• 4 Chester Street London SW1X 7BB

  20/06906/FULL Submitted 30 Oct 2020 50 yards away

  Variation of Condition 1 of planning permission dated 31 Janurary 2017 (RN: 16/11228/FULL) for the: Construction of a full width extension at rear lower ground and half width extension at upper ground floor level ; replacement of timber steps to front lightwell with metal steps, new door to front lightwell and lowering part of the vaults floor; replacement of existing rooflight with larger frameless double-glazed rooflight and one new rooflight at main roof level; replacement of doors at rear upper ground floor with a new window; and external renovation and repair works. Namely, to allow the removal of low wall to the rear terrace at first-floor level and replace with black painted railings.

  Granted Full applications Extension Loft or dormer +1 13 docs

• 24 Chester Street London SW1X 7BL

  26/00077/FULL Submitted 7 Jan 2026 50 yards away

  Erection of two storey rear extension at ground and lower ground floor level and associated works.

  Granted Full applications Extension 41 docs

• 26/06295/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Installation of a new shopfront with Medication Dispensing Outlet.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06297/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Alterations to rear elevation at basement level comprising replacement window and installation of double opening door.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06294/FULL Awaiting decision

  15 Eaton Mews South London SW1W 9HP

  Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06317/FULL Awaiting decision

  124 Hamilton Terrace London NW8 9UT

  Replacement of existing first-floor sash windows to the front and rear elevations with traditionally detailed painted timber, slim-profile double-glazed sash windows. (Linked to 26/06318/LBC)

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06273/FULL Awaiting decision

  9A Grosvenor Square London W1K 5AE

  Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

  Received 14 Sep, published by the council 22 Sep 2026 Full applications