Basement, Ground & Loft Extension in Fulham
45 Bowerdean Street
Basement enlargement, a rear lightwell and replacement ground-floor extensions, coordinated with a second-floor rear addition at a Victorian terrace in Fulham.
Project overview
The Project
The scheme at 45 Bowerdean Street combines four changes to a Victorian terrace in Fulham: a second-floor rear extension over the back addition, a replacement single-storey side and rear extension, basement enlargement beneath the house and garden with a rear lightwell, and new rooflights over the side extension.
AC Design Solution coordinated the planning application, structural engineering, Building Regulations drawings and Party Wall notices and awards. The basement and upper-level works required the team to consider the retained building and neighbouring properties together.
Hammersmith and Fulham Council granted planning permission on 9 April 2026 under 2026/00378/FUL. The scheme was approved as submitted, without design revisions requested during the application.
Drawings and project imagery
Project Gallery
04 presentation plates
Selected architectural drawings, technical details and project views from the coordinated design package.
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Planning strategy
Planning & Heritage
Four additions within one conservation-area scheme
The planning design considered the scale, proportions and materials of the rear, side and upper-floor additions in relation to the Victorian house and its conservation-area setting. The basement and lightwell were assessed alongside the external changes above ground.
The application was considered against the Hammersmith and Fulham Local Plan, Planning Guidance SPD and national policy. Architectural drawings and supporting technical information formed one submission, with the relationship to neighbouring properties addressed across the combined scheme.
Permission was granted under delegated authority on 9 April 2026, with the proposed form and materials accepted. Browse our Hammersmith and Fulham projects for other local examples.
Engineering coordination
Structural Engineering
Supporting the retained house during basement and extension work
The structural package included retaining walls, underpinning, steelwork and load-transfer arrangements for the basement excavation and upper-level additions. Replacing the existing rear extensions required the new structure to be coordinated with the walls and floors that remained.
Our structural drawings and calculations were developed with the architectural package to resolve beam positions, bearings and foundations before the Building Regulations submission. Our basement impact assessment service explains the wider investigations that can accompany excavation below an existing building.
Technical compliance
Building Regulations
The Building Regulations package covered fire safety, thermal performance, ventilation, drainage, structural design and construction detailing. The basement works, new extensions and roof alterations all had to be coordinated as one technical submission.
The approved planning drawings were developed into a detailed construction package suitable for Building Control review and use by the contractor on site.
Neighbouring property matters
Party Wall
The basement excavation, demolition of existing extensions and construction close to the neighbouring boundaries triggered obligations under the Party Wall etc. Act 1996.
The required Party Wall notices and awards were coordinated with the architectural and structural information so the adjoining owners received clear details of the proposed works and protective measures.
Consent and delivery
Project Outcome
The combined scheme received planning permission on 9 April 2026 without design revisions. The appointment brought the planning, structural, Building Regulations and Party Wall information into the same project programme.
For another Fulham scheme combining basement excavation with rear and roof additions, see 37 Hazlebury Road. To discuss the scope for your own house, book a consultation.
