House Extensions | South West London
House Extensions South West London
Expert house extensions across SW London. Side return, rear and wraparound builds — fixed-price quotes, one team throughout, and no deposit required.
No deposits. Only pay for completed work.
Request a quote
Tell us about your project and we'll be in touch to arrange a consultation.
No deposit
You only pay for work that's completed, valued week by week.
Guaranteed work
All work is guaranteed for complete peace of mind.
Vetted & managed trades
Our trusted team is managed directly by us.
Always in touch
Your project manager keeps you updated every step of the way.
Honest advice
We'll always give you straight advice and advise if savings can be made.
Recent projects across SW London
Why Choose Bluebird Spaces for Your Extension
Add Significant Value
Extensions can add 15-25% to your property value with the right design
12-16 Week Build
Efficient project management ensures timely completion
Design Excellence
Thoughtful designs that maximize light and space
FMB Accredited
Certified Federation of Master Builders member
Types of House Extensions
Side Return Extension
From £45,000
Perfect for Victorian and Edwardian terraces. Reclaim wasted side passage space and create an open-plan kitchen-diner.
- Typically 3-4m x 6m (18-24m²)
- Often permitted development
- Transforms narrow kitchens
- 10-12 week build time
Single-Storey Rear Extension
From £65,000
The classic extension. Extends into your garden to create a spacious kitchen-dining area with bi-fold or sliding doors.
- Typically extends 3-6m from house
- Permitted development (usually up to 6m for terraced)
- Floods space with natural light
- 12-14 week build time
Wraparound Extension
From £95,000
Combines side return and rear extension for maximum space. Creates impressive open-plan living areas.
- Typically adds 40-60m²
- May require planning permission
- Transforms entire ground floor
- 14-18 week build time
What's Included in Our Extensions
Structural Work
- Full foundations and groundwork
- Steel beam installation
- Brickwork and masonry
- Roof structure and tiling
Windows & Doors
- Bi-fold or sliding doors
- Roof windows or lanterns
- High-performance double glazing
- External door frames
Internal Finishes
- Plastering and decoration
- Flooring installation
- Skirting and architraves
- Kitchen fit-out ready
Services & Compliance
- Full electrical installation
- Plumbing and heating
- Building regulations approval
- Structural engineer's design
Detailed Pricing Guide
Extension Costs by Type and Size
Side Return Extension (18-24m²)
Standard specification
£45,000 - £58,000
Single-Storey Rear (25-35m²)
Extending 4-5m with bi-folds
£65,000 - £85,000
Single-Storey Rear (40-50m²)
Extending 6m+ with roof lantern
£85,000 - £115,000
Wraparound Extension (50-70m²)
Combined side return and rear
£95,000 - £140,000
Additional Costs to Consider:
- Kitchen supply & fit: £15,000 - £40,000
- Party Wall Agreement: £700 - £1,500 per neighbour
- Planning permission: £350 - £1,200 (if required)
- Premium finishes: 15-25% additional cost
Note: All prices include VAT, building regulations, and structural engineer. Fixed price guaranteed.
How a house extension works
Free site visit and feasibility
We assess your garden, existing structure, drainage runs and any party wall implications. We advise on single storey, double storey or wraparound options and give a realistic budget range before any fees are paid.
What our clients say
Don't just take our word for it — hear from homeowners across SW London
"Tom was brilliant throughout the whole build process. It was a pleasure to be asked for a website review, after all they did for us. We are truly grateful to the whole team for the level of quality and for continually going the extra mile."
Rowan A
Wandsworth
"Bluebird was recommended to me by our local estate agent. Lovely guys and so pleased decided to go with them. Tom, Milen and the team on site were so professional and couldn't have been more helpful. Very happy clients."
Emma and Tom
Richmond
"The first project we trusted Tom and Milen with was a house conversion into 4 flats. We didn't know it at the time, but using Bluebird for such a big project was the best decision we have made. They are our first call when we find another development."
Tony and Rhys
Putney
House extensions across SW London
We've delivered house extensions throughout southwest London, from side-return extensions on Wandsworth terraces to wraparound builds in Wimbledon. Every borough has its own planning requirements — conservation areas, permitted development limits, party wall agreements — so we've put together a dedicated page for each area we cover, with local pricing and planning guidance specific to that location.
House extensions in Wandsworth
Side return and rear extensions for Wandsworth's terraced homes
House extensions in Battersea
Rear and wraparound extensions suited to Battersea's period housing
House extensions in Clapham
Side return and double-storey extensions across Clapham
House extensions in Putney
Extending Putney's semi-detached and terraced properties
House extensions in Chelsea
Sympathetic extensions for Chelsea's listed and period buildings
House extensions in Richmond
Navigating Richmond upon Thames planning for conservation areas
House extensions in Fulham
Rear and side return extensions for Fulham's terraced streets
House extensions in Wimbledon
Rear, side return and wraparound extensions in conservation-area Wimbledon
Frequently asked questions
Ready to talk about your project?
Free consultation. Transparent, fixed-price quote within 48 hours.