Service
Outbuildings & Garden Rooms in Kent
Permanent, fully-insulated garden buildings — not flat-pack timber sheds.
Garden rooms and outbuildings built for year-round living
For over 25 years, we have designed and built high-quality outbuildings for a varied clientele across Kent, creating fully insulated spaces that are built for long-term, everyday use. From home offices and gyms to hobby studios, workshops, and guest annexes, our outbuildings provide practical additional space without the disruption or cost of a full home extension.
Unlike temporary garden structures or flat-pack buildings, our outbuildings are designed as permanent, high-performance spaces with proper foundations, insulation, heating, electrics, and weatherproof construction to ensure comfort and durability throughout the year. Every project is tailored to the property, lifestyle, and intended use of the client, with a strong focus on quality craftsmanship and modern design.
We offer a range of construction methods, finishes, and roofing options, including timber-frame and SIP construction, cedar and composite cladding, green roofs, and contemporary architectural detailing. Our team manages the entire process in-house, including groundwork, structural construction, electrics, plumbing, insulation, plastering, and final finishes.
Why choose us for outbuildings & garden rooms
- Usually permitted development
- Year-round usable space
- Built on proper foundations
Recent projects
A snapshot of outbuildings & garden rooms we've completed across Kent and South East London.
Materials & finishes
- Concrete pad or screw-pile foundations
- SIP or timber-frame walls
- Cedar, larch or composite cladding
- EPDM, zinc or sedum roofing
- PIR insulation
- Aluminium bifold or sliding doors
- Underfloor heating or AC
Our process
- 1Site survey
- 2Design & quote
- 3Foundations & frame
- 4Cladding & weatherproofing
- 51st & 2nd fix, decoration
Insulated garden office with shower room
- Tonbridge, TN9
- 7 weeks on site
- £36,500 + VAT
Challenge
Self-employed couple both working from home full-time, fighting over the spare bedroom every day. Wanted a proper garden office big enough for two desks plus a small shower room so one of them could swim at lunchtime without trekking back to the house. Garden was sloped and access was via a 900mm wide side gate — so no machinery on site.
Solution
Screw-pile foundations to handle the slope without excavation (also faster and cheaper to install through a narrow access). 5.4m x 3.6m timber-frame structure, 140mm PIR walls, 200mm PIR roof, EPDM flat roof. Cedar cladding outside, plasterboard with smooth-set finish inside. Aluminium bifold doors across the back wall facing the garden. Internal partition created a small (1.4m x 1.8m) shower room with WC, basin and walk-in shower — plumbed to the house's existing waste run. Underfloor heating on engineered oak, dedicated 32A electrical circuit for office equipment, Cat6 to the house.
Outcome
Delivered in 7 weeks despite the access constraints. Both clients now work from the office full-time and have effectively recovered their spare bedroom. Property valuer added £45k to the house value at the next remortgage.
Typical timeline
4–8 weeks on site for most garden offices; 8–14 weeks for fully-fitted annexes.
Pricing guidance
Garden offices from £18,000 (15m²) up to £45,000+ for larger insulated rooms. Garden annexes with kitchenette and shower room £45,000–£85,000.
Where we work
Garden buildings across Kent and SE-London — particularly popular with home-working professionals across Sevenoaks, Tonbridge, Beckenham and Bromley.
View service area mapFrequently asked questions
Do I need planning permission?
Most outbuildings under 2.5m eaves height fall under permitted development. Annexes used as separate dwellings always need planning.
Can I sleep in it?
Garden rooms used as occasional guest space are fine. Anything used as a permanent separate dwelling needs a Lawful Development Certificate or planning.
How long do they last?
Built properly with a real foundation and insulated structure — 25+ years. We give a 10-year structural warranty.
Is it warm in winter?
Yes — full PIR insulation, double-glazed doors and either electric panel heaters or underfloor heating means year-round comfort.
Related services
Ready to start your outbuildings & garden rooms project?
Free site visit anywhere in Kent and South East London, with a fixed-price quote within 7 days.