27, 35 Mortimer Street Westminster W1T 3BL
Amendments to planning permission dated 07 July 2020 (RN: 20/02379/FULL) for the: Erection of a roof extension to provide additional office (B1) floorspace at fifth floor level and associated external alterations including the creation of a roof terrace at fifth floor level and reconfiguration and relocation of plant within a new purposely designed acoustic enclosure at part rear fifth floor and part sixth floor/roof level. NAMELY, to allow the reduction of plant enclosure footprint at the rear of the building and removal of the steel grated flooring over plant area below; extension of cat ladder landing to roof; alterations to 5th floor including relocation of the terrace rooflight and reduced size of planter at the rear side of the terrace, reduced size of window at rear side of the building, finish to terrace changed to grey tiles, acoustic screen to 5th floor plant to be solid and not louvred, and plant enclosure to be retained as existing not reclad.
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Progress
Application details
- Reference
- 21/06721/NMA
- Local authority
- Westminster
- Postcode
- W1T 3BL
- Ward
- WED_02
- Application type
- All Other
- Property type
- Commercial
Key dates
- Submitted
- 30 Sept 2021
- Validated
- 30 Sept 2021
- Target decision
- 28 Oct 2021
- Decided
- 26 Oct 2021
Estimated project value
£37k–£100k
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: Checkatrade 2026 loft conversion cost guide.
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.
- 28 - 30 HANWAY STREET, LONDON, W1T 1ULOther · Not a standard market sale · £3,775,0003 months ago5 Jun 2026
- APARTMENT B6, 101 - 103 CLEVELAND STREET, LONDON, W1T 6FBFlat or maisonette · Leasehold · Not a standard market sale · £1,620,0003 months ago28 May 2026
- FLAT 8, 3 TOTTENHAM MEWS, LONDON, W1T 4ABFlat or maisonette · Leasehold · £1,200,0003 months ago26 May 2026
- FLAT 22, FURNIVAL MANSIONS WELLS STREET, LONDON, W1T 3PLFlat or maisonette · Leasehold · £525,0004 months ago1 May 2026
- APARTMENT 402, 3 PEARSON SQUARE, LONDON, W1T 3BGFlat or maisonette · Leasehold · Not a standard market sale · £1,230,0004 months ago30 Apr 2026
- APARTMENT 202, 7 PEARSON SQUARE, LONDON, W1T 3BPFlat or maisonette · Leasehold · £2,600,0005 months ago1 Apr 2026
- FLAT 5, 61 CHARLOTTE STREET, LONDON, W1T 4PFFlat or maisonette · Leasehold · £1,450,0005 months ago27 Mar 2026
- 5 WINDMILL STREET, LONDON, W1T 2JAOther · Not a standard market sale · £2,150,0005 months ago26 Mar 2026
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
- 27, 35 Mortimer Street Westminster W1T 3BLPermittedNext door
- 27, 35 Mortimer Street Westminster W1T 3BLPermittedNext door
- 27, 35 Mortimer Street Westminster W1T 3BLPermittedNext door
- 27, 35 Mortimer Street Westminster W1T 3BLPendingNext door
- 27, 35 Mortimer Street Westminster W1T 3BLPermittedNext door
- Swan Court, 1 Booth's Place Westminster W1T 3AFPermittedNext door