3 Northumberland Place London W2 5BS

1. 14 Aug 2026

   Received by Westminster

2. 25 Aug 2026

   Validated

   Checked as complete and ready for consideration.

3. 28 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 20 October 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 60 days over the applications it decided in the last year.

This application is with Westminster for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 12 Northumberland Place London W2 5BS

  22/04212/ADFULL Submitted 27 Jun 2022 0m away

  Details of construction contract agreed between all land owners and lessees pursuant to condition 7 of planning permission dated 19th March 2021 (RN: 21/00382/FULL).

  Granted Full applications 9 docs

• 3 Northumberland Place London W2 5BS

  25/07538/ADFULL Submitted 17 Oct 2025 0m away

  Detailed drawings of new railings, new bin store, new lightwell porch, method statement explaining the measures you will take to protect the trees on and close to the site and details of the foundations of the bin stores pursuant to conditions 4, 5 and 7 of planning permission dated 13th February 2025 (RN:24/07005).

  Granted Full applications Extension Trees 18 docs
  Small domestic

• 3 Northumberland Place London W2 5BS

  26/00800/TCA Submitted 10 Feb 2026 0m away

  100% historically approved · decision due ~7 Apr

  Magnolia growing in the front left hand corner of the front garden of 3 Northumberland Place, tree 1 on the attached plan. Fell, remove stump and main roots. Reasons - poor specimen with low amenity value and no real scope for improvement. To be replaced, together with a replacement for the recently removed cotoneaster (ref 25/03383/TCA) Proposed replacements to be agreed with Westminster, we suggest Japanese maple, silverbell tree or similar small / medium ornamental tree.

  Awaiting decision Trees 7 docs

• 9 - 10 Northumberland Place London W2 5BS

  26/01573/FULL Submitted 11 Mar 2026 0m away

  87% historically approved · decision due ~8 May

  Erection of a mansard roof extension and solar panels at no. 10 Northumberland Place

  Awaiting decision Full applications Extension Loft or dormer 7 docs

• 15 Northumberland Place London W2 5BS

  26/01468/TCA Submitted 6 Mar 2026 0m away

  1 x Silver Birch (T9, rear): Trim crown by 20%

  Granted Trees 8 docs

• 11 Northumberland Place London W2 5BS

  22/05510/TPO Submitted 9 Aug 2022 17m away

  Front garden: T1 Evergreen Magnolia x 1 (Magnolia grandiflora) This previously reduced tree has now begun to block light from gardens and properties. Suggested works: Reduce all round to previous reduction points approx. 1m leaving furnishing growth.- Clean out crown

  Withdrawn Trees 4 docs

• 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.

  27 Aug 2026 Lawful development
• 26/05816/CLOPUD Awaiting decision

  124 - 126 Wardour Street London W1F 0TY

  Use of flats 1, 2 and 4 as three single dwellinghouses (Class C3).

  25 Aug 2026 Lawful development
• 26/05786/CLOPUD Awaiting decision

  6 Grosvenor Street London W1K 4DJ

  Confirmation that the planning permission dated 31 July 2024 (RN: 23/08374/FULL) for the: Refurbishment and extension of existing Class E building to include the extension of the fifth floor, partial demolition and reconstruction of the sixth floor, erection of a new seventh floor with external terrace, alterations to the Avery Row and Grosvenor Street elevations to include new shopfronts, entrances and replacement windows, installation of green roof and photovoltaic panels at main roof level and installation of screened plant at seventh floor level. (SITE INCLUDES 4 GROSVENOR STREET), was lawfully implemented prior to the expiration date and that it is lawful to complete the outstanding works.

  24 Aug 2026 Lawful development
• 26/05724/CLEUD Awaiting decision

  The Sky Bar Trocadero 13 Coventry Street London W1D 7DH

  Confirmation of the lawful implementation of planning permission dated 31 August 2023 (RN: 22/06174/FULL) has commenced before the expiry of the three year time period and may, therefore, lawfully be carried out and completed.

  20 Aug 2026 Lawful development
• 26/05547/CLOPUD Awaiting decision

  15 Grosvenor Hill London W1K 3QA

  External fire remediation works to an existing four-storey residential apartment building. Works comprise of: . The removal and replacement of the existing external wall cladding system with a matching system of identical appearance, profile, colour and finish, upgraded to achieve A2-s1,d0 fire performance standards. . Replacement of combustible insulation where necessary . Replacement and introduction of cavity barriers, fire-stopping measures and associated supporting components as required to comply with current fire safety requirements. The replacement materials will replicate the existing appearance of the building and will not result in a material alteration to the external appearance. Minor associated works are proposed to the rear elevation only, with no changes to the use of the building, site access arrangements, highways, drainage, hardstanding or site layout. The building will remain in use as residential flats throughout and no increase in floorspace, building height or residential accommodation is proposed.

  14 Aug 2026 Lawful development