Start with the connection to the existing house
A side-return extension is more than a new strip of floor space. Opening the flank or rear wall can change how the floors, roof and remaining masonry are supported. We review the proposed opening, retained walls and the route that loads take to the ground. Share the full existing and proposed plans, including the rooms above, so the brief reflects the building as a whole.
Resolve rooflights, levels and bearings together
A glazed roof or a run of rooflights needs to work with the supporting structure. Beam depth, roof falls, ceiling levels and the position of posts can affect the room your architect is creating. Early structural input helps identify these questions before the layout is fixed. Any concealed bearings or existing steelwork may need to be verified through agreed investigation.
Understand the narrow boundary strip
Tell us about drains, inspection chambers, neighbouring extensions, changes in ground level and any known foundations. Foundation design depends on the site information; a detail used next door is not automatically suitable. Works close to neighbouring structures should be discussed with your project team, including any party wall adviser, before the construction programme is agreed.
Plan how the structure will reach the rear
Many London terraces have access through the house rather than a side passage. Share the narrowest doors, turns and working-space restrictions with the contractor and engineer. If a connection or divided member is proposed to suit delivery, it needs to be designed for that arrangement. Temporary support and installation planning should be separately agreed.
A useful structural package
The agreed scope can include calculations, structural drawings, bearing and foundation details, and responses to relevant Building Control questions. We identify assumptions and information still required. Design changes, investigation work and additional visits are discussed before they are added to the appointment.
What to send with your enquiry
- Existing and proposed floor plans, roof plans and sections.
- Photographs of the side return, rear wall and neighbouring construction.
- Known drainage information and any records of earlier alterations.
- Postcode, access route and the programme you are considering.
London site attendance by arrangement. Scope, fees and any visits are agreed before work begins.
Common questions
Can the new opening be completely free of posts?
That depends on the existing structure, opening and available supports. Share your preferred layout so the structural implications can be assessed before a solution is promised.
Can you work with my architect’s side-return design?
Yes. Send the latest drawings and the key features you want to retain. We agree the structural scope and coordinate the relevant details with your project team.