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 after a site visit, one team throughout, and no deposit required.

    No deposits. Only pay for completed work.

    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.

    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 Members

    Certified Federation of Master Builders member

    Types of House Extensions

    Side Return Extension

    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
    Most Popular

    Single-Storey Rear Extension

    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
    • Up to 3m under PD; up to 6m with prior approval (not in conservation areas)
    • Floods space with natural light
    • 12-14 week build time

    Wraparound Extension

    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
    • Built to building regulations (Building Control fees quoted separately)
    • Coordination with your structural engineer (engineer's fee quoted separately)

    How a house extension works

    01

    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 explain the practical next steps before any fees are paid.

    No obligationFreeSame day feedback

    What our clients say

    Don't just take our word for it — hear from homeowners across SW London

    "Ben, Tom and Milen are just brilliant. Not only were these guys and their team knowledgeable, hard working and great at communicating but they also pointed out issues that we had not thought of. Every aspect of the work has been carried out to a very high standard."

    Clemmie and Jack

    Chiswick · Google review

    "Ben is a fantastic project manager, he doesn't pass any stress onto his clients. Tom is amazing — everything is possible according to Tom. The end result is phenomenal."

    Sophie Weston

    Clapham · Google review

    "Absolutely brilliant firm. Hired them for a loft conversion. Really professional, great build quality, high quality finish. Great communication throughout. We are thrilled with the result and would hire them again in a heartbeat"

    Peter Hughes

    Google review

    "Tom, Milen & Ben at Bluebird Spaces, 100% delivered on constructing our ground floor extension. The project came out on time, on budget and with customer happiness as their ultimate goal."

    Dan & Maddy

    Sheen

    "Ben and Tom are just finishing a complete refurbishment of my two bedroom flat in Chelsea. They are a joy to work with. Responsive, helpful and always wanting me to get the best possible result. I recommend them wholeheartedly."

    Barry Lynch

    Chelsea · Google review

    "We worked with Bluebird on our kitchen extension project. Highly recommend. They were transparent, easy to work with, had top tradesmen who care about delivering a good build."

    Alex Ng

    Wandsworth · Google review

    "They were knowledgeable and explained each part of the process in terms that I could understand. All the workers are friendly, clean up after themselves every day. I would wholeheartedly recommend them."

    Jane Farrelly-Ward

    Richmond · Google review

    "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

    Fulham

    "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

    "We simply couldn't recommend Ben, Tom and Milen enough. The team was amazing for the duration of our ground floor project, which involved gutting and reconfiguring the lounge, kitchen and utility room."

    Andrew Cork

    Google review

    "We used Ben and his team to completely refurbish our house as well as create a new en suite bathroom. Being an older house we had several unexpected issues but Bluebird Spaces managed to still get everything finished on time…"

    Verena Peternell

    Google review

    FAQ

    Frequently asked questions

    Not always. Under householder permitted development, a single-storey rear extension can usually go up to 3m deep on a terraced or semi-detached house, or 4m on a detached house, without a planning application, within height and other limits. Going up to 6m (or 8m detached) needs prior approval from the council first: your neighbours are consulted and work can't start until the council approves or 42 days pass without a decision. That route isn't available in conservation areas. Flats and maisonettes don't have householder permitted development rights, listed buildings need listed building consent, and wraparound or larger side extensions usually need a full planning application. We check your position at our free site visit, then give you a fixed-price quote.

    A typical single-storey rear extension takes 12-14 weeks from start to completion. Side return extensions take 10-12 weeks, while wraparound extensions typically require 14-18 weeks. This includes all structural work, finishes, and final decoration.

    Yes, a well-designed extension typically adds 15-25% to your property value. In South West London, this can represent a significant return on investment, especially for kitchen-diner extensions which are highly sought after by buyers.
    Get Started

    Ready to talk about your project?

    Free consultation. Clear, itemised quote. No deposit upfront.