Track the latest renovation and development activity in Marylebone. We monitor planning applications across Westminster to help you understand what's possible on your street.
| Address | Project Type | Status | Date | Description |
|---|---|---|---|---|
| 59 Manchester Square, W1 | Side Return Extension | Approved | 24 Mar 2026 | Side return infill with rooflight to create enlarged kitchen |
| 18 Harley Street, W1 | Mansard Extension | Pending | 27 Feb 2026 | Rear mansard roof extension in natural slate with lead cheeks |
| 29 Manchester Square, W1 | Basement Conversion | Pending | 9 Feb 2026 | Full basement dig-out creating cinema room, gym and utility space |
| 15 Wimpole Street, W1 | Basement Conversion | Approved | 7 Feb 2026 | Conversion of existing cellar to habitable accommodation with new lightwell |
| 14 Dorset Square, W1 | Basement Conversion | Pending | 2 Feb 2026 | Single-storey basement extension with front and rear lightwells |
| 5 Portland Place, W1 | Full Refurbishment | Under Review | 19 Jan 2026 | Whole-house renovation including new heating system and upgraded insulation |
| 32 Devonshire Place, W1 | Garden Room | Approved | 18 Jan 2026 | Single-storey garden room with floor-to-ceiling glazing |
| 48 Harley Street, W1 | Full Refurbishment | Approved | 8 Jan 2026 | Internal reconfiguration and modernisation of all floors with new kitchen and bathrooms |
| 19 Dorset Square, W1 | Full Refurbishment | Under Review | 7 Jan 2026 | Internal reconfiguration and modernisation of all floors with new kitchen and bathrooms |
| 67 Devonshire Place, W1 | Roof Terrace | Approved | 4 Jan 2026 | Roof terrace to rear flat roof area with lightweight decking |
| 24 Welbeck Street, W1 | Full Refurbishment | Approved | 25 Dec 2025 | Comprehensive refurbishment retaining period details with contemporary additions |
| 32 Mansfield Street, W1 | Loft Conversion | Approved | 13 Sep 2025 | Conversion of existing loft space to create additional bedroom and en-suite bathroom |
| 52 Gloucester Place, W1 | Roof Terrace | Approved | 23 Aug 2025 | Creation of accessible roof terrace with privacy screening |
| 24 Welbeck Street, W1 | Change of Use | Under Review | 7 Jul 2025 | Conversion of former pub to residential accommodation |
| 6 Mansfield Street, W1 | Basement Conversion | Approved | 27 Jan 2025 | Excavation to create new basement level with lightwell and swimming pool |
Marylebone has seen strong renovation activity over the past twelve months, with basement conversions accounting for 27% of all planning applications. Full Refurbishments follow at 27%, with roof terraces making up a further 13% of submissions. This pattern reflects the character of Marylebone's housing stock and the aspirations of homeowners in the W1 postcode.
As a designated conservation area, Marylebone requires all external alterations to be sympathetically designed and built using appropriate materials. Planning officers at Westminster Council pay close attention to proposals that affect the streetscape, particularly along prominent roads such as Harley Street and Wimpole Street. Despite these additional requirements, our data shows a 60% approval rate for applications in the area — evidence that well-prepared submissions continue to succeed.
The most active streets for development in Marylebone include Harley Street, Wimpole Street, Portland Place, where homeowners are investing in both extending and upgrading their properties. Full refurbishments and change-of-use applications reflect the mixed residential and commercial character of the area, with many conversions creating high-specification apartments.
Properties in Marylebone (W1) typically range from period terraces to substantial detached homes. Whether you are considering a straightforward loft conversion or a comprehensive basement dig, early engagement with Westminster Council's planning department — and appointing an architect familiar with local policy — will significantly improve your chances of a smooth approval. Our team maintains an outstanding track record across the W1 postcode.
Westminster Council manages planning applications across Marylebone and the wider borough. As a conservation area, Marylebone is subject to additional planning controls. Permitted development rights may be restricted under Article 4 directions, meaning proposals that would normally not require planning permission may need a formal application.
For advice on what you can build in Marylebone, see our Planning & Permissions guide. You can also review our planning track record to see our approval rates across London boroughs.
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