12 Thornton Place London W1H 1WB

This site has had 2 applications since 2006: 1 approved, 0 refused.

• 06/08825/FULL Withdrawn

  12 Thornton Place London W1H 1WB

  Alterations to include new sliding/folding doors and replacement of two windows with new doors with balconies.

  Decided 17 Jan 2007 Full applications

1. 2 Feb 2007

   Received by Westminster

2. 15 Feb 2007

   Decision issued: Application Permitted

3. 18 Sep 2026

   Added to PlanIndex

Westminster granted permission on 15 February 2007, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

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.

• 12 Thornton Place London W1H 1WB

  06/08825/FULL Submitted 2 Nov 2006 50 yards away

  Alterations to include new sliding/folding doors and replacement of two windows with new doors with balconies.

  Withdrawn Full applications Windows or glazing 5 docs

• 11 Thornton Place London W1H 1FG

  26/01208/FULL Submitted 25 Feb 2026 50 yards away

  Installation of air conditioning condenser and associated acoustic enclosure to existing roof.

  Granted Full applications 16 docs

• 13 Salisbury Place London W1H 1FJ

  25/07187/ADFULL Submitted 6 Oct 2025 50 yards away

  Details of secure by design accreditation pursuant to Condition 10 of planning permission dated 27th March 2025 (RN: 23/08920/FULL).

  Granted Full applications 4 docs

• 56 Upper Montagu Street London W1H 1SN

  25/09343/LBC Submitted 24 Dec 2025 50 yards away

  90% historically approved · decision due ~18 Feb

  Use of ground floor and mezzanine levels to rear as residential (Class C3) use; deconversion of ground floor and mezzanine levels to rear together with two studio flats and one one-bedroom flat to form one three-bedroom maisonette; creation of reconfigured office unit in basement; replacement of all but one window with slimline timber double glazed units installation of secondary glazing to one window; renovation of shopfront; reinstatement of glazed fanlight with opening vent, new solid panel door, and awning; new glazed doors to south elevation of mezzanine garden room; new metal balustrading across rear boundary and raised terrace surface level with walk-on roof lights; replacement of concrete roof tiles with slate and new glazed roof light/ roof access; creation of green roof above mezzanine garden room; removal of modern partition walls and reinstatement of historical plan form as far as possible; reinstatement of historic period features all in connection with the use of building as office at part basement level with the remainder of the building being used as a single residential unit (Class C3) and associated internal alterations. (Linked to 25/09342/FULL)

  Awaiting decision Heritage and listed buildings New dwelling Loft or dormer +2 21 docs

• 56 Upper Montagu Street London W1H 1SN

  25/09342/FULL Submitted 24 Dec 2025 50 yards away

  87% historically approved · decision due ~18 Feb

  Use of ground floor and mezzanine levels to rear as residential (Class C3) use; deconversion of ground floor and mezzanine levels to rear together with two studio flats and one one-bedroom flat to form one three-bedroom maisonette; creation of reconfigured office unit in basement; replacement of all but one window with slimline timber double glazed units installation of secondary glazing to one window; renovation of shopfront; reinstatement of glazed fanlight with opening vent, new solid panel door, and awning; new glazed doors to south elevation of mezzanine garden room; new metal balustrading across rear boundary and raised terrace surface level with walk-on roof lights; replacement of concrete roof tiles with slate and new glazed roof light/ roof access; creation of green roof above mezzanine garden room; removal of modern partition walls and reinstatement of historical plan form as far as possible; reinstatement of historic period features all in connection with the use of building as office at part basement level with the remainder of the building being used as a single residential unit (Class C3) and associated internal alterations. (Linked to 25/09343/LBC)

  Awaiting decision Full applications New dwelling Loft or dormer +2 24 docs

• 45 York Street London W1H 1PW

  25/09312/LBC Submitted 23 Dec 2025 50 yards away

  Installation of cavity membrane system to the walls and soffit of the vault.

  Granted Heritage and listed buildings 12 docs

• 26/06158/CLOPUD Awaiting decision

  2 Hamilton Gardens London NW8 9PT

  Erection of replacement, enlarged single storey ground floor rear extension.

  Received 9 Sep, published by the council 15 Sep 2026 Lawful development
• 26/06080/CLEUD Awaiting decision

  91 Gloucester Place London W1U 6JG

  Certificate of lawfulness for an existing use or development to confirm that the development authorised by full planning permission ref. 22/08385/FULL & listed building consent (RN 22/08386/LBC) has lawfully commenced as a result of the works evidenced.

  Received 7 Sep, published by the council 14 Sep 2026 Lawful development
• 26/06044/CLOPUD Awaiting decision

  9 Abinger Mews W9 3SP

  Proposed loft conversion with rear dormer and 3 front rooflights to existing mid-terraced house.

  Received 3 Sep, published by the council 11 Sep 2026 Lawful development
• 26/06035/CLOPUD Awaiting decision

  30 Ashworth Road W9 1JY

  Erection of new garden retaining wall and erection of new garden timber fence to match the height of existing fence.

  Received 3 Sep, published by the council 11 Sep 2026 Lawful development
• 26/05871/CLEUD Awaiting decision

  32 Cambridge Street London SW1V 4QH

  Confirmation of the lawful implementation of planning permission dated 13 August 2021 (RN: 21/04143/FULL) has commenced before the expiry of the three year time period and may, therefore, lawfully be carried out and completed.

  Received 27 Aug, published by the council 4 Sep 2026 Lawful development