Basement and roof extensions at 19 Chepstow Villas, Kensington, London W11

What was proposed

The application proposed a basement extension with lightwells, rear extensions with Juliet balconies, and a mansard roof with dormer windows.

“/PP/25/03102:1 THE ROYAL BOROUGH OF KENSINGTON AND CHELSEA PLANNING APPLICATIONS COMMITTEE 04/11/2025 REPORT BY THE DIRECTOR, PLANNING AND PLACE Application: PP/25/03102 Agenda Item: N128 Address:19 Chepstow Villas, LONDON, W11 3DZ Proposal: Basement extension and associated lightwells; rear extensions at the ground and first floor levels including Juliet balconies; construction of mansard roof with dormer windows.”

“/PP/25/03102:2 recommendation is to grant. 3.The site and its surroundings 3.1 The application site is a three-storey detached villa, located on the southern side of Chepstow Villas. 3.2The property lies within the Pembridge Conservation Area.”

Officer report

Earlier permissions

Earlier permissions covered a rear ground-floor extension and alterations and extensions linked to converting the property into flats.

“4.4The relevant planning history is set out below: ReferenceDescriptionDecision TP 6765/1The erection of a rear extension at ground floor level Granted 20 September 1972 T/P 82/0715 Alterations and extensions in connection with the conversion to 2 x 3 bedroom flats and 1 x 1 bedroom Granted 16 August 1982 5.Main policies and strategies relevant to the decision The development plan 5.1The main planning considerations applying to the site and the associated policies are: Local…”

Officer report

Main planning issues

The main issues were the basement, the building’s character, the conservation area, and living conditions for nearby residents.

“/PP/25/03102:4 impact on land contamination in the Borough and would be in accordance with policy GB18 of the Local Plan 2024. 6.5The Council’s Air Quality Officer has reviewed the submitted material and no raised objection. Informatives 1, 2 and 3 are recommended to outline construction and operations impacts in relation to policy GB6 of the Local Plan 2024.”

“Therefore, the proposal would preserve the character and appearance of the building and wider Pembridge Conservation Area in accordance with policies CD1, CD2, CD4, CD10 and CD15 of the Local Plan. Roof ballustrade and cornice 6.24The proposal would replace the existing balustrade on the main roof level of the building.”

Officer report

Consultation responses

Five letters, including one from the Pembridge Association, objected on consultation, design, living conditions, trees, structural effects and construction concerns.

“4 Trees The tree report does not take into account certain trees present within our garden, the root protection areas of which would be directly impacted by the development. The Council’s Arboricultural Officer has reviewed the submitted material and concluded that the proposal would not have a wider impact on trees. Conditions are recommended to secure further details of the protection of trees during construction. 5 Structural implications The application is supported by an…”

“/PP/25/03102:9 Due to the extent of the basement, this may affect the water table. The proposal would cause damage to my property due to movement and vibration. acceptable Construction Method Statement includes a detailed site investigation and borehole trialling, and groundwater was not encountered. The submitted CMS demonstrates that the structural safety of the building and neighbouring properties will be protected.”

Officer report

Speakers

There were no speakers for this item.

The committee vote

The committee unanimously agreed to grant planning permission with the conditions in the officer report.

“Resolved unanimously: that planning permission be granted with the conditions in section 9 of the officer report.”

Minutes