Side Return Extension Specialists in London
That narrow alley down the side of your terrace? We turn it into usable kitchen space.
All Well Property Services provides professional side return extensions across South East London. I price every project individually after a free site visit, so you get a clear written quote with a week-by-week programme rather than a calculator estimate. All projects include a fixed-price contract, single project manager, and full Building Control sign-off. Call 020 3920 9617 for a free consultation.
What We Offer
That narrow alley down the side of your terrace? We turn it into usable kitchen space. Side return extensions add width to your ground floor without touching the garden. Ideal for Victorian and Edwardian terraces across South London.
- ✓Victorian and Edwardian terrace specialists
- ✓Side passage to kitchen-diner conversion
- ✓Structural steelwork and RSJs
- ✓Bifold and sliding door installation
- ✓Underfloor heating
- ✓Full electrical and plumbing fit-out
- ✓Building Control sign-off included
- ✓FENSA registered glazing
How I price side return extensions
I quote every job after a free site visit. The price covers materials, labour and a realistic programme, all fixed in writing before we start. No hidden costs, no mid-job surprises.
Book a free site visitWhat Affects the Cost?
- •Length of the side return passage
- •Glazing specification (Crittall-style vs standard)
- •Structural steelwork to open up the wall
- •Kitchen fit-out specification
- •Access and scaffolding requirements
Side return extension specialists in South London
We have built side return extensions across SW and SE London since 2020. They make up a large share of our work. The job is specific. We fill in the narrow passage beside a terrace, drop a structural steel beam in at the level of the existing kitchen ceiling, and open the old side wall into the new space. A side return almost always feeds into a wider kitchen project, so it pairs naturally with our [kitchen extensions](/services/kitchen-extensions).
Side return extensions
A side return extension takes the dead alley down the side of your house and turns it into kitchen floor. We build them most often in Clapham, Battersea, Balham, Tooting, Wandsworth and Putney, and across Crystal Palace, Lewisham, Forest Hill and Dulwich. Every side extension we run sits within the existing footprint, so you keep the garden.
Side return extensions for period terraces
A side return extension on a Victorian terrace works because the side passage is original to the house and sits within permitted development on most plots. Widths vary by area, and we measure that on the site visit. Crystal Palace terraces often run wider at 1.2 to 1.5 metres. Some Clapham houses are tighter at 0.9 to 1.1 metres, which changes how much you gain from the side infill extension.
Party Wall Act, structural and accreditation standards
A side return extension triggers the Party Wall Act 1996 on almost every job, because the new structure sits against the wall you share with the house next door. We handle that paperwork and the engineering rather than leave it on you.
Party wall notices and surveyor fees
We serve Party Wall Notices on the adjoining owner at least two months before work starts. If the neighbour dissents, we coordinate the appointment of an Agreed Surveyor. Surveyor fees run from £750 and are paid by the homeowner doing the work.
Structural steel, glazing and certification
Our chartered structural engineer designs the steelwork and submits the calculations to Building Control. Openings for a standard side return usually take 152x152 UC beams, larger on wider spans, with padstones sized to spread the load across the existing brickwork. Glazing on the new external wall is Crittall-style or Slimline aluminium, FENSA-registered, with thermal performance to a U-value of 1.2 to 1.4 W/m²K. Every new circuit carries NICEIC certification to BS 7671. We are CHAS-certified for site safety. We carry £5 million Public Liability insurance.
How we run your side return extension
One project manager takes the job from survey to handover. They serve the party wall notices early, get the structural engineer's calculations in, manage the steel delivery and crane lift, and run the trade schedule day to day. Building Control inspects at foundation, drainage, steelwork, insulation and completion.
Fixed-price contracts
The quote includes the structural engineer's fees, party wall surveyor coordination, FENSA registration, Building Control fees and any conservation area applications. The price holds unless you change the specification.
Neighbour management
A side return affects the neighbour more than most extensions. There is structural work on the shared wall, new glazing facing their garden and scaffolding going up against the boundary. We serve notice early, share the drawings, keep to agreed work hours and clean the site daily. We run all of this from Unit 1 Limes Avenue, Anerley, London SE20 8QR, Companies House number 12721034, with 57 verified Google reviews averaging 4.5 out of 5 stars.
Free tools for planning your project
No email required. Get instant estimates and planning answers before you book a consultation.
Side Return Cost Calculator
Get an instant estimate for your side return extension in London. Factor in passage length, glazing type, kitchen fitout, and your borough for a detailed cost breakdown.
Best Month
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Listed Check
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Planning Risk
Traffic-light check of every planning restriction at your postcode: listed buildings, conservation areas, Article 4 directions, Tree Preservation Orders, flood zones. Live data from Planning.data.gov.uk.
Recent Side Return Extensions Projects
Side Return Extensions across South East London
What Our Customers Say
“So happy with the work done by Les and Richard!! We bought a house that needed new paint, cracks filled, a new bathroom fan and some mold removal and they did it all. The quality of the work is phenomenal; it looks like a brand new house. We’ll definitely be hiring them for our future projects!”
Brenna Bodine
3 months ago
“So happy with Joel’s work in refurbishing my flat. There was no job too big or small for him and all done to a high standard. I won’t hesitate to use him again!”
Callum Stone
4 months ago
“Joel is 100% reliable, patient, skillful and easy to have around. He repainted my hall, landing and stairs over two floors and made good a disastrous previous plastering problem. I am thrilled with the result and recommend him extremely highly!”
Mel Carter
8 months ago
Accredited & Certified
Frequently Asked Questions
- What is a side return extension?
- A side return extension fills in the narrow alleyway — typically 0.9 to 1.5 metres wide — that runs along the side of most Victorian and Edwardian terraced houses in London. By building over this passage and opening up the dividing wall with a structural steel beam (typically a 203x203 UC or similar RSJ sized by a structural engineer), you can add 30-50% more width to your ground floor kitchen without losing any garden space. The result is usually a bright, open-plan kitchen-diner that feels dramatically larger than before, often gaining 8-15 square metres of usable floor area. Side returns are one of the most popular home improvements in boroughs like Lewisham, Dulwich, Peckham, and Greenwich because they work within the existing footprint and typically fall under permitted development, meaning no planning application is needed. We have run side return extensions across South London since 2020.
- Do side return extensions need planning permission?
- Most side return extensions fall within permitted development rights under the Town and Country Planning (General Permitted Development) Order 2015, meaning no formal planning application is required. The extension must not exceed 3 metres beyond the original rear wall for terraced houses, must stay below 4 metres in height at the eaves, and must not cover more than half the total garden area. If your property is in a conservation area — such as those in Dulwich, Blackheath, or parts of Greenwich — you may face additional restrictions on visible glazing, materials, and roof design. Listed buildings always require Listed Building Consent, which typically adds 8-12 weeks to the approval timeline. We assess all of this during the free site visit and apply for a Lawful Development Certificate (approximately £129 application fee) if you want formal written confirmation from the council that your extension is permitted. Around most of our side return projects proceed under permitted development.
- How much does a side return extension cost?
- A standard side return infill in South East London starts from around £40,000. This includes structural steelwork to open up the kitchen wall, new foundations (typically strip foundations to 1 metre depth), roofing with glazing such as a flat glass roof or roof lantern for natural light, full insulation to current Building Regulations Part L standards, electrics, plumbing, plastering, and decoration. Combining the side return with a rear extension to create a wraparound layout starts from around £55,000 depending on the total floor area. Crittall-style glazing adds a premium from around £3,000 over standard powder-coated aluminium frames. Kitchen unit fitting is quoted separately unless you want us to supply and install. We survey the property first and provide a fixed-price quote in writing; these figures are based on side return projects completed across South London since 2020.
Related Services
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