Single-storey basement at 33 Clabon Mews, Chelsea, London SW1X

What was proposed

The application proposed excavating a single-storey basement beneath the existing building for a playroom, gym and shower room.

“/PP/25/05360:1 THE ROYAL BOROUGH OF KENSINGTON AND CHELSEA PLANNING APPLICATIONS COMMITTEE 18/11/2025 REPORT BY THE DIRECTOR, PLANNING AND PLACE Application: PP/25/05360 Agenda Item: S118 Address:33 Clabon Mews, LONDON, SW1X 0EQ Proposal: Excavation of single storey basement Applicant: [the applicant]: MrKeane Mimetico Properties notified:Objections:Support:Comments:Petition: 12 4000 Conservation area:Hans Town 1.Summary 1.1 The proposed basement would comply with the…”

“/PP/25/05360:2 3.2No. Clabon Mews is a positively contributing building within the Hans Town Conservation Area. No. Clabon Mews is in the Sloane Critical Drainage Area. 4.The proposal and any relevant planning history 4.1The proposed development is for a single storey basement within the parameters of the existing building. The proposed basement would be used as a playroom, gym and contain a shower room. 4.2Officers visited the site on 01/10/2025.”

Officer report

The site and surroundings

The property is a three-storey corner mews building in the Hans Town Conservation Area, backing onto taller properties facing Lennox Gardens.

“2.Reason for committee consideration -Three or more objections were received during the consultation period and the recommendation is to grant. 3.The site and its surroundings 3.1 No. Clabon Mews is a corner plot mews property on the corner of Clabon Mews and Milner Street and is three stories high. The site backs onto properties facing Lennox Gardens, which are taller, six storey properties.”

Officer report

Why officers supported it

Officers considered the basement acceptable because it met basement policy and would preserve the conservation area and neighbouring living conditions, subject to conditions.

“6.3Biodiversity net gain (BNG) has become mandatory from 12 February 2024 under the Environment Act 2021. The development would be below the threshold for BNG, and therefore, would be exempt. 6.4No external manifestations are proposed, and therefore the proposed basement would preserve the character, appearance and significance of the Hans Town Conservation Area. In addtion, there would be no loss of privacy to those living nearby.”

Officer report

Objections and consultation responses

Four objections concerned structural stability, possible connections to Lennox Gardens and overdevelopment, while consultees raised no objection subject to conditions or had no objection.

“/PP/25/05360:5 summarised below. CommentResponse Concerns in relation to proposed basement being connected to properties on Lennox Gardens and the structural stability of these properties The proposed basement would be contained to the footprint of the original mews property. Given it’s a corner plot, the works would be next to No.”

“See Section 6.1 Land Contamination Officer No objection subject to condition.See Section 6.11 Environmental Health Officer No objection.See Section 6.4 9.Recommendation 9.1Grant Planning Permission 1.Time limit (Full PP) The development hereby approved shall be begun before the expiration of…”

Officer report

Who spoke

No speakers were present at the committee meeting.

The committee vote

The committee unanimously voted to grant planning permission with the conditions listed in section 9.

“Resolved unanimously: to grant planning permission with the conditions listed in section 9 of the officer report.”

Minutes