12 Devonshire Street Westminster W1G 7AF
Variation of Condition 9 of planning permission dated 14 December 2010 (RN: 10/05112) for construction of a new mansard roof extension to create additional (Class B1) office, alterations to the lift shaft at roof level; the provision of a new services compound to the rear of the site; internal alterations and internal and external refurbishment, namely to replace 4-5 Marylebone High Street with 63-65 Marylebone Lane for the provision of residential accommodation as part of a land use swap.
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Progress
Application details
- Reference
- 11/10850/FULL
- Local authority
- Westminster
- Postcode
- W1G 7AF
- Ward
- MARYLEBONE HIGH STREET
- Application type
- All Other
- Property type
- Commercial
Key dates
- Decided
- 17 Jan 2012
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.
- 4 DEVONSHIRE CLOSE, LONDON, W1G 7BAOther · Not a standard market sale · £7,8133 months ago27 May 2026
- FLAT 13, 40 - 41 WIMPOLE STREET, LONDON, W1G 8ABFlat or maisonette · Leasehold · £1,000,0004 months ago30 Apr 2026
- FLAT 2, 36 DEVONSHIRE PLACE, LONDON, W1G 6JRFlat or maisonette · Leasehold · £1,450,0004 months ago23 Apr 2026
- FLAT 47, BASILDON COURT, 28 DEVONSHIRE STREET, LONDON, W1G 6PRFlat or maisonette · Leasehold · £700,0005 months ago19 Mar 2026
- FLAT 49, 2 MANSFIELD STREET, LONDON, W1G 9NFFlat or maisonette · Leasehold · £2,140,7507 months ago30 Jan 2026
- FLAT 47, MELCOMBE REGIS COURT, 59 WEYMOUTH STREET, LONDON, W1G 8NTFlat or maisonette · Leasehold · £775,0007 months ago21 Jan 2026
- 18 WHEATLEY STREET, LONDON, W1G 8PSOther · Leasehold · Not a standard market sale · £1,550,0007 months ago16 Jan 2026
- FLAT 33, MELCOMBE REGIS COURT, 59 WEYMOUTH STREET, LONDON, W1G 8NTFlat or maisonette · Leasehold · Not a standard market sale · £242,0007 months ago14 Jan 2026
Homes here go for about £1,000,000 — the median of the last 5 market sales in W1G (the wider postcode district), £700,000 to £2,140,750.
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
- 12 Devonshire Street Westminster W1G 7ABPermittedNext door
- 12 Devonshire Street Westminster W1G 7ABPendingNext door
- 12 Devonshire Street Westminster W1G 7ABPermittedNext door
- 13-14 Devonshire Street Westminster W1G 7AEPermittedNext door
- 13-14 Devonshire Street Westminster W1G 7AEPermittedNext door
- 13 Devonshire Street Westminster W1G 7AEPermittedNext door