63 Blandford Street, Marylebone High Street, W1U 7HR
Work to an existing home
Westminster · Reference 26/06137/LBC
What is being proposed
Erection of mansard roof extension, including raising of the chimney stack to retain the same height relationship to the roof; formation of a brick party wall; provision of dormer windows to match neighbouring dormer profiles, alteration of the rear dormers to casement doors; and alteration to the proposed stair to the fourth floor. (Linked to 26/04651/FULL)
Description as published by Westminster.
What this could mean for you
These are the effects a proposal like this most often raises. Each one is a material planning consideration, so each can form the basis of a comment.
- Daylight and overshadowing
- Overlooking and loss of privacy
Derived automatically from the proposal wording. Read the full application before relying on it.
Timeline
Received
8 Sept 2026 · Submitted to the council
Validated
8 Sept 2026 · Checked and published
Comments close
Not yet · Last day to have your say
Decision due
3 Nov 2026 · Target date, often slips
Decided
Not yet · Outcome published
Key facts
- Reference
- 26/06137/LBC
- Authority
- Westminster
- Address
- 63 Blandford Street, Marylebone High Street, W1U 7HR
- Postcode
- W1U 7HR
- Type
- Extension or home alteration
- Scale
- Minor
- Applicant
- Not published
- Agent
- Not published
- Received
- 8 Sept 2026
- Decision due
- 3 Nov 2026
Also happening nearby
63 Blandford Street, Marylebone High Street, W1U 7HR
A follow-up to an existing permission · the principle is already approved, so only the detail is under consideration
Variation of Condition 1 of planning permission dated 3rd November 2025 (25/04449/FULL) for: Erection of mansard roof extension with three new front dormers, two rear dormers (one dormer window and one dormer door), raising height of chimney by 330mm, installation of 6 over 6 pane slimline double glazed timber sash windows, installation of photovoltaic panels at roof level. NAMELY, to allow raising of the chimney stack to retain the same height relationship to the roof; formation of a brick party wall; provision of dormer windows to match neighbouring dormer profiles; alteration of the rear dormers to casement doors; and alteration to the proposed stair to the fourth floor.