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Permitted23/07589/FULLSubmitted 2 years agoFront extension

16 Mortimer Street Westminster W1T 3JL

Variation of Condition 1 of planning permission dated 03 August 2023 (RN: 23/02362/FULL) for, 'Partial demolition; infill of rear lightwells; front extension at fifth floor level and introduction of a terrace; partial replacement of front elevation; refurbishment of existing building; installation of plant equipment; replacement windows; cycle parking; and associated external alterations; in connection with the use of the building as Offices (Class E);; NAMELY, the reduction of roof level massing to the rear, installation of guttering above fifth floor and introduction of roof pitch increasing the height of the fifth-floor façade by 250 mm; removal of external basement to ground floor stair to the rear, revised canopy design to the front, revised signage design to left of canopy, addition of three external wall lights at ground level, new planters at ground and terrace levels, revised Crittall style window arrangement, spandrel panel at front facade to incorporate vertical detailing to match mullions, change in location of bike racks, reduction of window sizes to east and west lightwell infills and introduction of grilles at eastern infill, and proposed reduction in rooflight to east and west infill extension. (Application under Section 73 of the Act).

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Progress

Submitted
1 Nov 2023
— completed
Validated
1 Nov 2023
— completed
Consultation
6 Dec 2023
— completed
Target date
27 Dec 2023
— completed
Decided
21 Dec 2023
— completed

Application details

Reference
23/07589/FULL
Local authority
Westminster
Postcode
W1T 3JL
Ward
WEW_22
Application type
All Other
Property type
Commercial

Key dates

Submitted
1 Nov 2023
Validated
1 Nov 2023
Comments close
6 Dec 2023
Target decision
27 Dec 2023
Decided
21 Dec 2023

Estimated project value

£21k–£54k

Typical UK cost for this job type, at inner London rates (2026). Estimated from the proposal description — planning applications do not state build cost. Source: MyJobQuote / Checkatrade 2026 extension rates.

Recently sold nearby

New owners, recently moved in. First work on a house usually follows within months of completing. 8 recent sales are listed below.

Homes here go for about £1,325,000 — the median of the last 4 market sales in W1T (the wider postcode district), £525,000 to £2,600,000.

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.

Planning constraints

No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.

Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.

Nearby applications