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Planning application

1B Chester Row London SW1W 9JF

Awaiting decision Westminster 26/04485/FULL Full Planning Permission Application

Works: Extension

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

New basement extension (under the rear half of the building) to enlarge the existing basement (beneath the front half of the building), including creation of a new lightwell along the rear of the building.

As published by the council, reference 26/04485/FULL

Application record

Reference
26/04485/FULL
Type
Full Planning Permission Application
Status
Pending
Received
6 Jul 2026
Validated
6 Jul 2026
Ward
Knightsbridge & Belgravia
Postcode
SW1W 9JF

Site history

Applications at this address on the Westminster register

This site has had 4 applications since 2025: 2 approved, 1 refused.

  • 25/08340/ADFULL Granted

    1B Chester Row London SW1W 9JF

    Detailed drawings of new rear windows pursuant to Condition 5 of planning permission dated 24th September 2025 (RN:25/05281/FULL)

    Decided 12 Feb 2026 Full applications
  • 25/07487/ADFULL Refused

    1B Chester Row London SW1W 9JF

    Detailed drawings of new rear windows pursuant to condition 5 of planning permission dated 24th September 2025 (RN: 25/05281).

    Decided 13 Nov 2025 Full applications
  • 25/05281/FULL Granted

    1B Chester Row London SW1W 9JF

    Extension at rear roof level, relocation of existing plant enclosure, simplification of roofscape including new roof maintenance access hatch.

    Decided 24 Sep 2025 Full applications

Timeline

Dates from the published record

  1. 6 Jul 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 31 August 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 91 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

AD Heritage Planning Agent, a planning consultancy

13 applications on PlanIndex · across 3 councils

Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.

See their track record

Documents

Plans, drawings, consultee responses and the officer's report

31 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

Watch members (£5 a month) open the document list from here.

Open the documents

What happens while it is decided

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 119 days. More in our guide to how long planning decisions take.

About full applications

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.

Nearby applications

Within 0.3 miles

  • 1B Chester Row London SW1W 9JF

    25/05281/FULL Submitted 29 Jul 2025 50 yards away

    Extension at rear roof level, relocation of existing plant enclosure, simplification of roofscape including new roof maintenance access hatch.

    Granted Full applications Extension Roofing 27 docs

  • 1 Chester Row London SW1W 9JF

    25/09022/LBC Submitted 12 Dec 2025 50 yards away

    Installation of scaffold fixings, removal and replacement of render and structural strengthening to cracks in underlying brickwork to front elevation.

    Granted Heritage and listed buildings 15 docs

  • First Floor Flat 75 - 77 Elizabeth Street London SW1W 9PJ

    25/07677/FULL Submitted 23 Oct 2025 50 yards away

    Installation of replacement sashes (double glazed) within the existing box frames to the front and rear at first floor level and associated works.

    Granted Full applications Windows or glazing 15 docs

  • First Floor Flat 75 - 77 Elizabeth Street London SW1W 9PJ

    25/07678/LBC Submitted 23 Oct 2025 50 yards away

    Installation of replacement sashes (double glazed) within the existing box frames to the front and rear at first floor level and associated works. (Linked with 25/07677/FULL)

    Granted Heritage and listed buildings Windows or glazing 10 docs

  • 83 Elizabeth Street London SW1W 9PG

    22/01093/LBC Submitted 20 Feb 2022 50 yards away

    Replacement of existing doors on the rear elevation with timber-framed door to provide access to a small balcony; new staircase; replacement of existing window in the ground floor closet wing with new sash window; and raising of garden party-wall with planted trellis.

    Granted Heritage and listed buildings Windows or glazing 13 docs

  • 83 Elizabeth Street London SW1W 9PG

    22/01092/FULL Submitted 20 Feb 2022 50 yards away

    Replacement of existing doors on the rear elevation with timber-framed door to provide access to a small balcony; new staircase; replacement of existing window in the ground floor closet wing with new sash window; and raising of garden party-wall with planted trellis.

    Granted Full applications Windows or glazing 19 docs

In Westminster

  • 26/07528/FULL Awaiting decision

    69 Eaton Place London SW1X 8DF

    Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

    Received 5 Nov, published by the council 6 Nov 2026 Full applications
  • 26/05200/FULL Decided

    1 The Court House 165 Seymour Place London W1H 4PU

    Installation of waterproofing system to the existing lead flat roofs

    Received 3 Aug, published by the council 28 Aug 2026 Full applications
  • 26/07521/FULL Awaiting decision

    Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

    Installation of one external condenser unit

    Received 4 Nov, published by the council 6 Nov 2026 Full applications
  • 26/07508/FULL Awaiting decision

    Buckingham Palace The Mall London SW1A 1AA

    Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

    Received 4 Nov, published by the council 5 Nov 2026 Full applications
  • 26/07472/FULL Awaiting decision

    Flat 3 82 New Cavendish Street London W1G 9TA

    Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

    Received 3 Nov, published by the council 6 Nov 2026 Full applications