Design-and-buildextensions and loftsacross South London

Rear closet wings and side return infills

The Victorian closet wing is the defining feature of the South London terrace, and it is the thing that makes side-return infill more complicated than it looks. The wing's flank wall is usually load bearing, often built in soft stock brick on shallow footings, and the existing rear drainage almost always runs straight through the area you want to build over.

We survey the structure and the drainage before design is finalised, set out the steel arrangement and any needed underpinning, and confirm the build-over agreement position with the water authority so it does not surface as a delay after the contract has started.

• Closet wing structure assessed before demolition is planned
• Drainage build-over and manhole positions resolved at design stage
• Party wall implications identified so notices can be served in time

Loft conversions and the headroom question

South London roof voids look generous, but the usable result depends on the ridge height, the roof pitch and whether the roof is traditional cut timber or a trussed post-war design. Many owners commit to a conversion without knowing where the new staircase will land or whether the finished ceiling height works over enough of the floor area.

We test headroom, staircase geometry and the fire strategy on drawings first. A three-storey house triggers protected escape route and fire door requirements, and pretending otherwise simply means failing building control at the worst possible moment.

London Clay, street trees and seasonal cracking

South London sits on London Clay across most of its area, and the terraced streets are heavily planted. Clay shrinks in dry summers and swells again in winter, and where a mature tree stands close to a shallow Victorian foundation the result is seasonal cracking that owners often mistake for structural failure or, worse, treat cosmetically.

Foundation depth for new work has to respond to tree proximity, and existing movement needs diagnosing before anyone plasters over it. We get structural input at design stage so the foundation solution is priced in the contract sum rather than raised as a variation once the trenches are open.

• Tree proximity and clay heave factored into foundation depth
• Existing cracking diagnosed before finishes are specified
• Structural design coordinated with the architecture, not after it

Tired services and damp in period stock

A South London terrace that has never been fully renovated typically has solid walls, a bridged or blocked sub-floor void, rewireable-era electrics, and a rear addition roof that has been patched repeatedly. Damp here is nearly always the symptom of a raised external level, a failed roof junction or blocked air bricks rather than something an injected chemical course will fix.

Our refurbishment sequencing puts structure, damp and services right before finishes go on, so the disruption happens once and the money you spend on the finish is not sitting on an unresolved fault.