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44 Chiltern Street London W1U 7QP

26/02432/FULLFull Planning Permission ApplicationApproved
Full

Approved on 24 June 2026

Site boundary (council red line)

Proposal

Installation of two external air conditioning condenser units positioned at ground floor level, on top of the existing light well roof.

Received
14 April 2026
Ward
Marylebone
  1. Received14 Apr
  2. Validated14 Apr
  3. Consult.
  4. Target9 Jun
  5. Decided24 Jun

Decided in 71 days (council typically 49)

About this application

This is a full planning application at 44 Chiltern Street London W1U 7QP. Westminster has handled 4,484 applications of this type. This one was decided in 71 days, 3 weeks longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 9 listed buildings nearby. There are no previous applications recorded at this address. In the past year there have been 171 applications across Marylebone. We hold 1,070 applications in total for the W1U postcode area.

86% of full applications at City of Westminster were approved. Across all application types, the council typically decides in about 7 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Application details

Postcode
W1U 7QP
Application type
Full Planning Permission Application
Scale / size
Small

Planning application dates

Date validated
14 April 2026
Target decision date
9 June 2026

Applicant and agent

Agent
101 A+D
Agent address
10-11 Saville Place Bristol Somerset BS8 4EJ GB

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-14854781
Comments
0
Documents
14

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Portman Estate
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (22)

flood storage areas, listed buildings, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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