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Planning application

18 Dartmouth Street London SW1H 9BL

Granted Westminster 25/08800/FULL Full Planning Permission Application

Works: Windows or glazing

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Replacement windows, installation of two sunpipes to rear, air source heat pump, installation of two gas fire flues to rear, installation of mechanical extraction vents, installation of boiler flue to rear, rendering of the rear elevation, installation of lead capping to front elevation, removal of fire escape to rear and replacement with a new terrace and associated works.

As published by the council, reference 25/08800/FULL

Application record

Reference
25/08800/FULL
Type
Full Planning Permission Application
Status
Decided
Decision
Granted As published: Application Permitted
Received
3 Dec 2025
Validated
10 Jun 2026
Decided
20 Jul 2026
Ward
St James's
Decision by
Complex Delegated Decision
Postcode
SW1H 9BL

Site history

Applications at this address on the Westminster register

This site has had 2 applications since 2025: 2 approved, 0 refused.

  • 25/05068/FULL Granted

    18 Dartmouth Street London SW1H 9BL

    Rear infill of courtyard to create larger basement (no excavation required), installation of French window on the ground floor, installation of two conservation roof lights.

    Decided 11 Sep 2025 Full applications

Timeline

Dates from the published record

  1. 3 Dec 2025

    Received by Westminster

  2. 10 Jun 2026

    Validated

    Checked as complete and ready for consideration.

  3. 20 Jul 2026

    Decision issued: Application Permitted

  4. 29 Jul 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Chestnut Planning Agent, a planning consultancy

29 applications on PlanIndex · across 12 councils · 82% granted

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Documents

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

34 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.

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What this grant of permission means

Westminster granted permission on 20 July 2026, 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.

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

  • 18 Dartmouth Street London SW1H 9BL

    25/05068/FULL Submitted 22 Jul 2025 50 yards away

    Rear infill of courtyard to create larger basement (no excavation required), installation of French window on the ground floor, installation of two conservation roof lights.

    Granted Full applications Extension Loft or dormer +1 27 docs

  • Broadway House 24-28 Tothill Street London SW1H 9NQ

    10/04494/FULL Submitted 27 May 2010 50 yards away

    Replacement of external rear fire escape staircase to rear elevation from basement to first floor.

    Granted Full applications 9 docs

  • Development Site At 1-11 And 13-15 Carteret Street 40 Broadway London

    25/08182/ADFULL Submitted 10 Nov 2025 50 yards away

    Details of a supplementary acoustic report pursuant to Condition 36 of planning permission dated 5 January 2024 (RN 22/05034/FULL)

    Granted Full applications 8 docs

  • Development Site At 1-11 And 13-15 Carteret Street 40 Broadway London

    25/08181/ADFULL Submitted 10 Nov 2025 50 yards away

    Details of Delivery and Service Plan pursuant to Condition 14 of planning permission dated 05 January 2024 (RN: 22/05034/FULL).

    Granted Full applications 8 docs

  • Development Site At 1-11 And 13-15 Carteret Street 40 Broadway London

    25/06140/ADFULL Submitted 28 Aug 2025 50 yards away

    Detailed drawings showing the following alteration(s) to the scheme provision of living roofs to all roofs not used as terraces or roof plant areas, provision of bird and bat boxes and details of a biodiversity management plan in relation to the living roofs pursuant to condition 31 and 32 of planning permission dated 5th January 2024 (RN:22/05034/FULL)

    Refused Full applications 11 docs

  • Development Site At 1-11 And 13-15 Carteret Street 40 Broadway London

    25/05341/ADFULL Submitted 30 Jul 2025 50 yards away

    Details of waste and recycling storage pursuant to condition 19 of planning permission dated 05 January 2024 (RN: 22/05034/FULL).

    Granted Full applications 12 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