Basement for a dwelling at 31 Willoughby Road, Hampstead, London NW3

“EXECUTIVE SUMMARY i) The application relates to a three-storey single-family terraced dwelling with attic accommodation on Willoughby Road, within the Hampstead Conservation Area and the Hampstead Neighbourhood Plan area. The site lies within a predominantly residential area and adjoins, along part of its side boundary, the Grade II listed Willow Cottages, a grade II listed terrace.”

“Figure 1 – Site location outlined in red 1.4 The application site has a Public Transport Accessibility Level (PTAL) rating of 3 (medium). Hampstead Underground Station and Hampstead Heath Overground Station are located within walking distance of the site, along with local bus services. 2.”

“SITE AND BACKGROUND 1.1 The application site comprises a three-storey single-family terraced dwelling with rooms in the attic, located on the western side of Willoughby Road, close to the junction with Willow Road. The surrounding area is predominantly residential in character and consists largely of terraced housing. Part of the side boundary of the application site is shared with Nos.”

“Regarding the appropriateness of the Burland scale for this type of structure, it was confirmed that the Burland scale can take both horizontal and vertical strain. • An objection suggested it was not appropriate for a wall without a building on top for additional stability and limitations to the Burland methodology were acknowledged. However, it was noted the actual predicted vertical movement was around a half to one millimetre at the retaining wall.”

“The negligible damage, being aesthetic and easily repairable, meant that the heritage assets would be preserved and not harmed. In response to Member’s questions, the deputees provided their views as follows: • The information provided by GCG, recognised that damage would occur via the Burland scale, even if it was slight (Category 1).”

“THAT Planning Permission be granted, subject to conditions and Section 106 obligations, as set out in the agenda.”

“Approved drawings The development hereby permitted shall be carried out in accordance with the following approved plans: Cranbrook Basement Design and Construction Ltd – Construction Method Statement ref 2362 dated 18th April 2024; Design Philosophy Report; Planning Statement; Structural Engineer Details; Covering Letter; Construction Method Statement Executive Summary; Basement Impact Assessment dated june 2024; Basement Impact Assessment Audit issued by Campbell Reith…”

“Approved Basement Impact Assessment The development hereby approved shall be carried out strictly in accordance with the Basement Impact Assessment prepared by Cranbrook Basement Design & Construction Limited (Basement Impact Assessment, 31 Willoughby Road, London, dated June 2024) and the recommendations set out in the Basement Impact Assessment Audit (Project No. 14291-07, 31 Willoughby Road, London NW3 1RT, dated October 2025, Rev 14291-07).”