Dunster House Ltd.
Est. 1994
28mm Double Glazing
We don't compromise on quality just because it is a garden building. Our garden offices have domestic style uPVC windows and doors, making your garden office secure and highly insulated. The 28mm sealed double glazing provides improved heat and sound insulation.
Multipoint Locking Windows & Doors
Our garden offices come with domestic grade multipoint locking windows and doors. Great for securing the garden building and its contents! Euro cylinder locks are used in our uPVC doors to ensure maximum safety and security.
Fully Pressure Treated
Our Garden Offices are made using non-toxic, pressure treated timber. This process forces wood preservative deep into the pre-cut timber using a large pressure treatment vat, meaning that there would be no need to spend time treating the timber for years. The timber is treated against fungal decay and insect infestation without any need for the customer to apply treatment during this time.
Tall Door Height
With a walkthrough height of over 6'4" (1.94m) there is no need to duck on the way in. They are probably the tallest doors on the market and great for moving furniture in and out of the office.
IzoPanel Roof
Our Garden Offices feature a very advanced roofing system manufactured by IzoPanel. They use a stiff polyurethane foam core (a material that provides a very low thermal conductivity rating) joined together tightly with overlapping cladding in a trapezoidal profile, which makes strong joints that prevent water ingress. Altogether the roof is waterproof, has great thermal characteristics and is uniquely strong.
Wide-Opening French Doors
The wide-opening French doors on our Titania Garden Office offer a large walkthrough width of 1.34m, which is handy for bringing in bulky items or to really open up the office to the outdoors, making the most of natural light and fresh air! The doors (and windows) also feature trickle vents to avoid moisture build-up when closed.
Moisture-Resistant Walls And Floor
Our unique design hinders moisture buildup inside the office. The walls of our Garden Offices have layers of shiplap cladding, moisture resistant membrane, thermal insulation panels and interior walls of Gypsum Fibreboard, which is also fire-resistant. The Pressure Treated Floor Bearers are covered by a layer of Wood Plastic Composite, followed by layers of insulation and MFP fibreboard. These layers minimize the transfer of moisture through the floor and walls, making this garden office a comfortable working environment all year round.
15mm Shiplap Cladding
Shiplap cladding is named after the old boatmaking technique where the boards overlap. This means that the natural timber can expand and contract with the seasons and not create gaps. The curve or channel of shiplap cladding enables water to run off easily.
Fire-Resistant Inner Wall
The inner walls of our Garden Offices are made using a fire-resistant fibreboard; a hard-wearing made from recycled paper fibres and Gypsum (Hydrous Calcium Sulphate). This Garden Office has increased protection from fire. The fibreboard comes unpainted, but it can be decorated, as it is a good surface for paint and is easy to wallpaper.
Energy Saving Insulation
The walls, floor and roof of our garden offices are all insulated to lower energy costs. We use Polyurethane to insulate our garden offices, which is proven to retain heat better than cheaper alternatives such as polystyrene or rockwool. The U values of our insulation are as follows: 0.64 W/m2 K in the roof, 0.62 W/m2 K in walls, and 0.70 W/m2 K in the floor.*Insulation means a reduction in loss of heat from an area that has been heated to a different temperature. If no heat has been applied, the insulation will be nominally the same as the outside temperature.
Please Note:

All sizes are approximate

External Width: 5.40m (17' 8")
External Depth: 3.30m (10' 9")
Internal Width: 5.18m (16' 11")
Internal Depth: 3.01m (9' 10")
Internal Area (m2): 15.62m2
Ridge Height: 2.48m (8' 1")
Internal Eaves (Front): 2.18m (7' 1")
Internal Eaves (Rear): 1.99m (6' 6")
Roof: Insulated IzoPanel
Roof Thickness: 135mm
Roof U-Value (W/m2k): 0.21
Overall Wall Thickness: 120mm
External Timber Thickness: 15mm Shiplap Cladding
Framing: 70mm
Insulation Thickness: 25mm
Insulation Material:


Internal Finish:

10mm Plasterboard

Floor: 40mm Insulated Sandwich Panel
Floor Bearers: 35m (114' 9")
Door Style: uPVC French Door
Door Material:

Steel reinforced 5 Chambered uPVC profile

Door Locking: 9 Point Locking System
Door Walkthrough Height: 1.84m (6' 0")
Door Walkthrough Width: 1.34m (4' 4")
Window Locking System:

Multi Point with Mushroom Headed Espagnolettes

Glazing Material:

28mm Double Glazed, Toughened Glass


Pressure Treated

Approx. DIY Assembly Time: 4-5 Days*
*This is an approximate time only, based on 2 people. Assembly time may vary depending on season/weather conditions, foundation type, ability of those constructing, etc.
Please Note:

All fixings needed for assembly are supplied