12 Chester Street London SW1X 7BB

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

• 26/01507/FULL Awaiting decision

  12 Chester Street London SW1X 7BB

  Variation of condition 1 of 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 omit the approved basement and minor amendments to the upper floors.

  Submitted 9 Mar 2026 Full applications
• 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. 1 May 2026

   Received by Westminster

2. 21 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 26 June 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 heritage and listed building applications in a median of 94 days. More in our guide to how long planning decisions take.

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

• 12 Chester Street London SW1X 7BB

  26/01507/FULL Submitted 9 Mar 2026 50 yards away

  87% historically approved · decision due ~4 May

  Variation of condition 1 of 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 omit the approved basement and minor amendments to the upper floors.

  Awaiting decision Full applications Extension Loft or dormer +1 17 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

• 26/04878/LBC Decided

  34 Grosvenor Street London W1K 4QU

  Internal works to facilitate the subdivision of 34 Grosvenor Street and 3 Three Kings Yard

  Received 21 Jul, published by the council 1 Aug 2026 Heritage and listed buildings
• 26/06299/LBC Awaiting decision

  Apartment 33 24 Park Crescent London W1B 1AA

  Alterations to internal partitions, door openings, doors and floor finishes.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06305/LBC Awaiting decision

  33A Dean Street London W1D 4PP

  Installation of new concrete slab with drainage channels at basement level and new fire surround in B.01.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06318/LBC 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 26/06317/FULL)

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/04141/LBC Decided

  80E Randolph Avenue London W9 1BG

  Replacement of sashes in two front windows at 2nd floor level and one rear window with slimline double glazed timber sashes. (Linked with 26/04142/FULL)

  Received 23 Jun, published by the council 21 Jul 2026 Heritage and listed buildings