Wraparound Extension
At Happy Building, we deliver architecturally stunning and practically perfect wraparound extensions for homeowners across South London and Surrey. Whether you’re aiming to expand a family kitchen, open up your floor plan, or bring more light into your home, we create large, liveable spaces designed to enhance your lifestyle and property value. From first sketch to final sign-off, our integrated team of architects, planners, and builders work together to bring your vision to life without stress, delays or budget shocks.
Our Wraparound Extension Services
At Happy Building, you can start from wherever you are with design, build or both. We offer three flexible service packages to suit your needs and budget.
Design & Build
One team handles everything from architectural drawings to construction with a single point of contact and a guaranteed budget match.
What’s included:
- End-to-end design, planning and construction
- Guaranteed match between design and build cost
- One team accountable for every detail
- Seamless scheduling and communication
- 6-year structural warranty
One dedicated project lead will oversee everything from start to finish, ensuring smooth coordination, risk management, and flawless delivery.
Just Design
If you’re in the early stages, our in-house architecture and planning team will create cost-aligned, build-ready plans that get approved fast.
What’s included:
- Local architects with in-person consultations
- Buildable design tailored to your property and budget
- Full planning application and revisions
- 99% success rate with councils across South London and Surrey
We design for real-world construction. No overcomplicated layouts. No unrealistic costs. Every drawing is made to build.
Just Build
Already have plans? Our construction team will deliver your extension to the highest standards with crystal-clear pricing, expert oversight and zero fuss.
What’s included:
- Licensed and insured construction professionals
- Dedicated senior project manager
- Transparent timelines and daily updates
- On-site safety, site cleanliness and progress tracking
- Live project visits available before signing
Our builders are vetted, experienced and trusted by hundreds of happy homeowners across the region.
Why Homeowners Choose Happy Building
Local Knowledge, Real People
We’re not an online agency or faceless subcontractor. We have a real studio in Cheam Village, where our in-house team works side-by-side every day. We know the local planning system, property styles and council expectations and we work with you face-to-face to get things done right.
Fixed Budgets. Guaranteed.
What we quote is what you pay. Our guaranteed budget match means we never design beyond your means or surprise you with extra costs later. It’s how we build trust and projects that run smoothly.
More 5-Star Reviews Than Anyone Else
We’re proud to be the highest-rated design and build team in South London and Surrey, with over 200 verified five-star reviews for quality, reliability and communication.
Award-Winning Craftsmanship
From ITV’s Big House, Little House to four years running at Grand Designs Live, our work has been recognised nationwide. But our proudest achievements are the hundreds of homeowners who love their new space.
95%
of our clients say
they’d build with us again
"Happy Building guided us from planning to build with zero stress — and stayed exactly on budget. We’d do it again in a heartbeat."
150+
granted planning approvals per year
"Nothing but positive words to say about our experience with Happy Building so far. Geo took our brief and nailed it more or less straight away and we've been impressed with the service to date. Working with Geo on our project has made life a whole lot easier & something that initially seemed so daunting/stressful has so far been a delightfully calm experience. Can't wait to see what comes next."
6 in 10
clients choose us because we are Local
“We chose Happy Building because they provide both the design and build process, and we had seen their local projects and were impressed. Happy Building has a straightforward process — we knew exactly what was happening and when. We knew what the cost would be and there were no surprises. They were proactive in their approach to any challenges that came up — they always came with a solution. Their team were accessible, engaged, and helpful at all stages. The build has transformed our house and changed the way we live in it — it’s better than we thought it would be!”
“We were very pleased with our experience working with Happy Building, especially Geo. He designed us a range of fantastic designs, including costing them up transparently and fairly. He was patient with our differing decisions, gave really sound advice, and communicated with us promptly and clearly. We wouldn't hesitate to recommend them!”
95%
of our clients say
they’d build with us again
"Happy Building guided us from planning to build with zero stress — and stayed exactly on budget. We’d do it again in a heartbeat."
Why Choose a Wraparound Extension?
A wraparound extension is the ultimate ground floor transformation. By combining a rear and side return extension, you create a large L-shaped layout that flows beautifully across your home. This extension style is ideal for:
- Creating an open-plan kitchen-diner with separate lounge and utility zones
- Maximising narrow side returns and unused garden areas
- Adding natural light through skylights, roof lanterns and bi-fold doors
- Creating indoor-outdoor spaces perfect for entertaining
- Increasing property value in sought-after areas of Surrey and South London
It’s not just extra space. It’s a smarter, more enjoyable way to live.
Wraparound Extensions We Build
Every wraparound extension is bespoke, tailored to your home, your lifestyle and your design goals. Some of the most popular options include:
Stylish Kitchen Extensions
Create a sociable kitchen space with a central island for casual dining, a walk-in pantry for easy storage, and clearly defined dining areas for family meals and entertaining.
Light-Filled Living Spaces
Maximise natural light with bi-fold doors, crittall glazing or roof lights, creating bright and airy interiors that connect seamlessly to the outdoors.
Multi-Functional Family Zones
Combine play, dining and lounge areas in one open-plan space, with clever hidden storage to keep the whole room clutter-free and family-friendly.
Practical Utility & Boot Rooms
Transform the side return into a hardworking space for laundry, coats and shoes, keeping the main living areas neat and organised.
Seamless Indoor-Outdoor Living
Add an integrated garden room to enjoy year-round indoor-outdoor living, perfect for relaxing, dining or entertaining with a view of your garden.
Book Your Free Consultation Today
Ready to unlock the full potential of your home with more space, more light, and better flow? Let’s design and build a bespoke wraparound extension that’s perfectly tailored to your lifestyle, personal style and budget, with expert guidance from concept to completion.
Contact us
FREQUENTLY ASKED QUESTIONS
How long does a wraparound extension take to complete?
Most wraparound extensions take between 16 and 24 weeks from the start of construction, depending on the size and complexity of the project. Design and planning typically take an additional 6 to 8 weeks. We’ll give you a clear timeline during your consultation.
Do I need planning permission for a wraparound extension?
Yes. Because wraparound extensions extend beyond both the rear and side elevations, they usually fall outside of permitted development rules. We handle the entire planning application process and have a 99% success rate with local authorities.
Can I stay in my home during the build?
In many cases, yes. We work to minimise disruption, section off the work area and maintain safe access. If your kitchen or key utilities will be out of action for a time, we’ll help plan temporary solutions or advise on short-term accommodation if needed.
How much does a wraparound extension cost?
Prices vary depending on the size, specification and complexity of your extension. We’ll provide a detailed, fixed-fee proposal based on real build costs in your area. There are no surprises or hidden extras, what we quote is what you pay.
Do you offer warranties and after-care?
Yes. Every project includes a 6-year structural warranty as standard. We also provide after-care support and snag list completion to ensure everything is exactly as expected post-handover