Range
Garden Rooms
Compact, insulated buildings for a garden office, studio or hobby space. Delivered as a kit or an assembled shell, installed in a day on a prepared base.
4 models · 14–27.9 m²
Garden Base
15 m²The basic modular garden house delivers essential functionality and usability at a lower price point, providing a practical and budget-friendly solution for those seeking to extend their living space outdoors.
1 storey
Garden Premium
18.8 m²A modular premium garden house offers a range of exceptional benefits, elevating your outdoor living experience to new heights.
1 storey
Garden Cafe
14 m²A modern factory-built café, delivered as a turnkey solution and installed in just one day. The garden café includes a quick start-up and minimal energy costs.
1 storey
Garden studio
27.9 m²A fully fitted modular unit that can be transformed into your ideal home office or a stylish, high-yield commercial space in just one day.
1 storey
Insulated garden rooms UK: office, studio or guest space
A Trident garden building is a factory-built, insulated timber-frame structure delivered as a kit or erected on site, on a ground screw foundation that is quoted separately. The class covers the compact Garden Base, the deeper Garden Premium, the Garden Studio with an ensuite shower room, and a factory-built garden café. The Base, Premium and Studio are BOPAS certified and built in an ISO 9001 quality managed factory.
They are designed for year-round use as a garden office pod, UK-wide, or as an art studio, a gym or a guest space. The walls and roof use non-combustible basalt wool insulation and Juta breather and vapour control membranes, with C24 structural timber and OSB-3 sheathing, and the price guides state U-values of 0.28 W/m²K for walls and 0.23 W/m²K for roofs.
Sizes are set by the panel module. Garden Base runs from 2300 × 2590 mm to 5600 × 2590 mm external; Garden Premium from 2300 × 3360 mm to 5600 × 3360 mm; Garden Studio from 5600 × 3370 mm to 6700 × 4180 mm. Each is priced per size on a three-step ladder in the price guides, from the factory kit through the assembled weathertight shell to a finished, move-in-ready building, and the Studio turnkey adds an ensuite shower room, water heater, Forbo flooring and full electrics.
Choosing an insulated garden building
Footprint and depth
Garden Base is 2.59 m deep in four sizes from 4.4 to 12.2 m² internal. Garden Premium is 3.36 m deep, from 6.5 to 12.2 m², with room for two desks or a small gym. Garden Studio runs from 15.6 to 19.2 m² with a shower room, and a deeper T variant of each size.
Kit, Shell Assembled or Turnkey
Each garden building has its own three-step ladder in the price guides: the factory kit for you to assemble, the weathertight shell erected by us, and a finished building with drylining, painting, LVT flooring, electrics and a panel heater. The Studio adds an ensuite shower room, water heater and Forbo flooring.
Planning
Many garden rooms fall within permitted development rights, depending on size, position and use. Check with your local planning authority; we can also provide planning guidance as part of our service.
Foundation and services
A ground screw foundation is quoted separately after a site survey, from £990 for Garden Base and £1,320 for Garden Premium. Electrical installation and other services can be added to a Base contract as separately priced items.
Common questions
Do I need planning permission for a garden room?
Many garden rooms fall within permitted development rights and do not require a planning application, depending on their size, position and use. We recommend checking with your local planning authority. We can also provide planning guidance as part of our service.
What is the smallest building you supply?
Our smallest garden rooms start from 4.4 m². We also supply larger annexes and full residential homes from 54 m² upwards.
Can I add services to a Base contract separately?
Yes. We can provide individual services such as electrical installation, plumbing or internal joinery as separately priced additions to a Base contract. Speak to us at quotation stage.
How far do you deliver?
We deliver nationwide. Delivery logistics are assessed at the quotation stage alongside confirmation of crane requirements, vehicle access and any restrictions specific to your site.
Do the prices shown on the website include VAT?
No, the prices shown do not include VAT. VAT can vary depending on the nature of the project and site, and we will clarify this at the quotation stage.
More answers on the full FAQ page.