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Planning application

18 Seymour Street London W1H 7HU

Granted Westminster 26/01486/LBC Listed Building Consent Application

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

Proposal

Replacement of the structurally failing front basement lightwell wall, with repair and reinstatement of railings and plinth stones; the introduction of a concealed structural backing wall (Stepoc blocks reinforced with concrete) and a lime-bedded reclaimed brick-facing wall.

As published by the council, reference 26/01486/LBC

Application record

Reference
26/01486/LBC
Type
Listed Building Consent Application
Status
Decided
Decision
Granted As published: Application Permitted
Received
9 Mar 2026
Validated
9 Mar 2026
Decided
1 Apr 2026
Ward
Marylebone
Decision by
Delegated Decision
Postcode
W1H 7HU

Site history

Applications at this address on the Westminster register

This site has had 8 applications since 2025: 1 approved, 1 refused.

  • 26/05164/ADLBC Decided

    18 Seymour Street London W1H 7HU

    Details of new vault doors pursuant to condition 3 of listed building consent dated 01 April 2026 (RN: 26/01486/LBC)

    Submitted 30 Jul 2026
  • 26/05009/FULL Decided

    18 Seymour Street London W1H 7HU

    Installation of external lighting to the front entrance and front basement lightwell, entry touch panel and proximity reader within the reveal of the entrance doorway.

    Submitted 27 Jul 2026 Full applications
  • 26/05010/LBC Decided

    18 Seymour Street London W1H 7HU

    Installation of external lighting to the front entrance and front basement lightwell, entry touch panel and proximity reader within the reveal of the entrance doorway.

    Submitted 27 Jul 2026 Heritage and listed buildings
  • 26/03007/ADLBC Awaiting decision

    18 Seymour Street London W1H 7HU

    Details of the repairs and upgrading of the rear oriel window pursuant to condition 5 of listed building consent dated 8th August 2023 (RN:23/02367).

    Submitted 7 May 2026 Conditions
  • 26/01286/ADLBC Awaiting decision

    18 Seymour Street London W1H 7HU

    Details of vaults waterproofing method pursuant to Condition 7 of listed building consent dated 8 August 2023 (RN: 23/02367/LBC)

    Submitted 2 Mar 2026 Conditions
  • 25/07393/ADLBC Refused

    18 Seymour Street London W1H 7HU

    Details of method of waterproofing of the vaults pursuant to Condition 7 of listed building consent dated 8th August 2023 (RN:23/02367/LBC)

    Decided 16 Feb 2026 Conditions
  • 25/06157/LBC Awaiting decision

    18 Seymour Street London W1H 7HU

    Repair strategy for the preservation of existing ceilings

    Submitted 29 Aug 2025 Heritage and listed buildings

Timeline

Dates from the published record

  1. 9 Mar 2026

    Received by Westminster

  2. 1 Apr 2026

    Decision issued: Application Permitted

  3. 21 Jul 2026

    Added to PlanIndex

Cases linked to this one on the register

1 later application on the register refers to this one:

  • 26/05164/ADLBC Decided

    18 Seymour Street London W1H 7HU

    Details of new vault doors pursuant to condition 3 of listed building consent dated 01 April 2026 (RN: 26/01486/LBC)

    Submitted 30 Jul 2026

Who's behind it

Company information only, from the register and Companies House

Latitude Architects Agent, an architecture practice

5 applications on PlanIndex

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

16 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 this grant of permission means

Westminster granted permission on 1 April 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 heritage and listed building applications

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.

Nearby applications

Within 0.3 miles

  • 18 Seymour Street London W1H 7HU

    26/03007/ADLBC Submitted 7 May 2026 50 yards away

    89% historically approved · decision due ~2 Jul

    Details of the repairs and upgrading of the rear oriel window pursuant to condition 5 of listed building consent dated 8th August 2023 (RN:23/02367).

    Awaiting decision Conditions Windows or glazing 10 docs

  • 18 Seymour Street London W1H 7HU

    26/05164/ADLBC Submitted 30 Jul 2026 50 yards away

    89% historically approved · decision due ~24 Sep

    Details of new vault doors pursuant to condition 3 of listed building consent dated 01 April 2026 (RN: 26/01486/LBC)

    Decided

  • 18 Seymour Street London W1H 7HU

    26/01286/ADLBC Submitted 2 Mar 2026 50 yards away

    89% historically approved · decision due ~27 Apr

    Details of vaults waterproofing method pursuant to Condition 7 of listed building consent dated 8 August 2023 (RN: 23/02367/LBC)

    Awaiting decision Conditions 7 docs

  • 18 Seymour Street London W1H 7HU

    25/07393/ADLBC Submitted 13 Oct 2025 50 yards away

    Details of method of waterproofing of the vaults pursuant to Condition 7 of listed building consent dated 8th August 2023 (RN:23/02367/LBC)

    Refused Conditions 12 docs

  • 18 Seymour Street London W1H 7HU

    26/05009/FULL Submitted 27 Jul 2026 50 yards away

    88% historically approved · decision due ~21 Sep

    Installation of external lighting to the front entrance and front basement lightwell, entry touch panel and proximity reader within the reveal of the entrance doorway.

    Decided Full applications 12 docs

  • 18 Seymour Street London W1H 7HU

    26/05010/LBC Submitted 27 Jul 2026 50 yards away

    90% historically approved · decision due ~21 Sep

    Installation of external lighting to the front entrance and front basement lightwell, entry touch panel and proximity reader within the reveal of the entrance doorway.

    Decided Heritage and listed buildings 1 doc

In Westminster

  • 26/07529/LBC Awaiting decision

    69 Eaton Place London SW1X 8DF

    Installation of new cast iron water supply pipe on rear courtyard elevation. (Linked with 26/07528/FULL)

    Received 5 Nov, published by the council 6 Nov 2026 Heritage and listed buildings
  • 26/07509/LBC 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 26/07508/FULL)

    Received 4 Nov, published by the council 5 Nov 2026 Heritage and listed buildings
  • 26/07473/LBC Awaiting decision

    Flat 3 82 New Cavendish Street London W1G 9TA

    Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07472/FULL)

    Received 3 Nov, published by the council 6 Nov 2026 Heritage and listed buildings
  • 26/07471/LBC Awaiting decision

    12 Queen Anne's Gate London SW1H 9AA

    Excavation of single-storey basement, internal reconfiguration and installation of modern services. (Linked with 26/07470/FULL)

    Received 3 Nov, published by the council 5 Nov 2026 Heritage and listed buildings
  • 26/07461/LBC Awaiting decision

    1 Savile Row London W1S 3JR

    Minor internal works comprising redecoration and upgrades to lighting, flooring and bathroom and kitchen facilities, together with external works including new lighting and signage.

    Received 3 Nov, published by the council 5 Nov 2026 Heritage and listed buildings