Every side return extension project in Fulham is designed to respect the Fulham Conservation Area and the character of Victorian terraces, Edwardian cottages, Hurlingham-side villas. Our in-house RIBA architects handle Hammersmith & Fulham planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Fulham has conservation area coverage in parts, so some properties will need planning permission for external changes while others may proceed under permitted development. We assess each property individually.
Our side return extension projects in Fulham are delivered by our in-house team of RIBA architects, structural engineers and specialist tradespeople. Every project is managed under a single fixed-price contract with no hidden costs.
Beyond the borough-wide basement direction, Hammersmith & Fulham has made Article 4 directions restricting permitted development rights at many individual properties — especially in conservation areas, to protect against unsuitable alterations — with directions covering Fulham streets and areas including Central Fulham (1)-(2), Fulham Park Gardens, Hurlingham, Studdridge Street (1)-(2), Walham Grove (1)-(2), Mimosa Street, Imperial Square and Fabian Road. Demolition work in Hammersmith & Fulham may need a Section 80 demolition notice under the Building Act 1984 giving the council six weeks’ notice before work starts (internal demolition within an occupied building and buildings of 50m³ or less are exempt); the council can issue a Section 81 counter-notice setting safety conditions, and a copy of the notice must go to the occupiers of neighbouring buildings. London-wide cost band for side return extension: £90,000–£120,000 excluding VAT (Resi side return cost guide, Feb 2026).
Sources: LBHF - Properties affected by Article 4 Directions (register of directions) (2026); LBHF - Demolition notices (building control guidance, Section 80 Building Act 1984) (2026); Side return extension (Resi side return cost guide, Feb 2026) (2026)
Victorian and Edwardian terraces were built with a narrow alley beside the rear closet wing — dead space that collects bins and shade. A side return infill claims that strip and folds it into the kitchen, turning a dark galley into a full-width room without losing any garden. A small footprint holds a dense engineering problem: building against a neighbour’s wall, removing your own flank wall, and re-routing the drainage that almost always runs down that alley.
Five stages, with the boundary and structural questions answered before anything is demolished.
Expect 12–20 weeks on site from groundworks to practical completion. Read the full side return extension guide for roof options, glazing comparisons and terrace case detail.
Because the work happens on or beside the boundary, the Party Wall etc. Act 1996 shapes the timetable of nearly every side return: building at the line of junction, cutting into the party wall for steel bearings and excavating near a neighbour’s footings each trigger their own notice, and if an adjoining owner dissents, a surveyor’s award must be in place before that element starts. Building Regulations approval is needed whatever the planning route. Our planning guide library covers the consent picture borough by borough.
Side returns punish loose coordination: the steel, the boundary and the neighbour relationship all have to be managed by people who talk to each other daily. Here the design comes from our in-house RIBA Chartered Architects, the structural calculations are produced in-house, and RICS surveying support for party wall and condition matters comes through our sister company, Hampstead Chartered Surveyors. You get one fixed-price JCT contract backed by £10M public liability cover, a 12-month defects period and a 10-year structural warranty. Enquire before 2pm on a weekday and we respond the same day.
Visit our studio or invite us to survey your home. We’ll assess scope, discuss design possibilities and provide an honest budget framework — completely free.
We survey your property, discuss your vision and provide a clear budget framework.