A Thicketts home extension gives your family the space it needs without the upheaval of moving, from single-storey kitchen extensions to wrap-arounds and double-storeys, designed and built by one local team.
We build extensions across Dorset for one fixed price, handling design, planning and building regs from start to finish.
Every certificate we hold is one you can check yourself. We’ll hand you the paperwork at completion without being asked.
“Every member of the Thicketts team was meticulous, professional and a pleasure to work with. They turned our vision into something truly special.”
The Hendersons · Kitchen-diner extension, Broadstone
Measure your plot
Step outside with a tape measure and note roughly how far out and how wide you’d like to extend. Approximate is absolutely fine.
Pick your type
Single-storey, wrap-around or double-storey, plus the extras that matter to you. The price updates instantly as you plan.
Let’s get started
Either our team will call you back to discuss the details or a project manager will pay you a visit - you choose!
A finished room, not a shell.
Every extension is handed over plastered, painted and ready to live in: electrics certified, floors laid, skirting on. The only thing left to choose is the furniture.
One team, no surprises.
Design, groundwork, build and finishing are all handled in-house by our own Dorset team, with no subcontractor roulette. You get one project manager, one fixed price and a weekly update, from first sketch to final coat of paint.
What’s included?
No hidden trades, no “that’s extra”. Every Thicketts extension is one fixed package that takes you from drawings to a decorated room:
Room to live the way you want
Whatever the extra square metres are for, we design the extension around how you’ll live in it.
Kitchen-diner
The open-plan heart of the home, flooded with light.
Extra bedroom
A double-storey extension adds space above and below.
Home office
A dedicated room to work, away from the family bustle.
Utility & boot room
Keep the mess and the muddy boots out of the kitchen.
Playroom
A hard-wearing space for the children to spread out.
Snug / living room
A second reception room for quiet evenings in.
Ground-floor annexe
Independent space for a relative or guest.
Bigger bathroom
Turn a cramped bathroom into a proper family one.
Guarantee
Guaranteed for 10 years
Every extension is backed by our insurance-backed 10-Year structural guarantee. It’s our promise that your new space is a durable, long-term investment. Terms & conditions apply.
See what’s coveredReasons to build with us
We’re a small Dorset team who care more about doing it right than doing it fast. Here’s what that means for you.
Get an instant priceDesign and build under one roof
Architectural drawings, structural calculations, planning and the build itself. One team, one contract, one person answering the phone.
Instant, realistic pricing
No “it depends”. Tell us your rough footprint online and see a genuine figure up front, confirmed at survey and fixed from then on.
Planning handled for you
We prepare and submit the planning application or permitted-development checks, and we don’t start charging for the build until consent is in.
A watertight build, fast
Our crews get the shell up and weatherproof in weeks, not months, so your home isn’t open to the sky while the inside is finished.
Planning, handled.
We check your property against permitted-development rules before we quote, and where an application is needed we prepare the drawings, structural calculations and paperwork and submit it for you, then see it through building-regs sign-off.
Recent extensions in Dorset
View full galleryThe back of your house, reconsidered.
We draw it, gain the permissions, build it and sign it off. One team, one fixed price, one point of contact.
What our customers say
Help and inspiration
Do I need planning permission?
The rules are friendlier than you’d think. Four numbers decide it, and our guide covers them in plain English.
Read the guideWhat does it cost?
No mystery pricing here. See our real 2026 bands and what sits inside them, or build your own project online.
See our pricingSee one in person
The best way to judge our work is to stand inside it. We’ll arrange a visit to a finished project near you.
Book a visitReady for the house to fit the family?
Plan your extension online for an instant price, or call us to talk through what your plot allows.