64 St James's Street, SW1A 1NF

What is being proposed

Amendments to planning permission dated 02 September 2021 (RN: 21/02158/FULL) for the: Demolition of the existing mansard roof and removal of plant and escape stair; erection of new double mansard roof extension and rear extension for additional commercial floorspace (Use Class E); and installation of new escape stair, rear balconies, roof terrace and associated works. NAMELY, increase the footprint of the rooftop plant enclosure and increase the height of the roof-level railing, necessitated by a revised roof level.

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.

• Noise and disturbance
• Overlooking and loss of privacy

Derived automatically from the proposal wording. Read the full application before relying on it.

Timeline

1. Received

   3 Sept 2026 · Submitted to the council

2. Validated

   3 Sept 2026 · Checked and published

3. Comments close

   Not yet · Last day to have your say

4. Decision due

   1 Oct 2026 · Target date, often slips

5. Decided

   Not yet · Outcome published

Key facts

Reference

26/06009/NMA

Authority

Westminster

Address

64 St James's Street, SW1A 1NF

Postcode

SW1A 1NF

Type

Extension or home alteration

Scale

Minor

Applicant

Not published

Agent

Not published

Received

3 Sept 2026

Decision due

1 Oct 2026

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