Garden Buildings

14x9 120mm Helena Garden Office (left)

For more unique features, take a look at our specifications tab.

The 4.5m x 2.5m (14' x 9' approx) (120mm thick) Helena Contemporary Garden Office - left orientation.

Let's not forget the pressure treated floor bearers with a 10-year guarantee. Or, the thick 19mm roof and floorboards which are included as standard. Not an optional extra like some competitors. Did we mention the 4mm toughened glass yet? We don't use styrene, Perspex or weak 3mm horticultural glass.

Customise your DunsterHouse garden office by changing the door & window trim colour in the options below.


Technical specs (Approx Dimensions)

Internal Eaves Height (C): 2.02m (6' 7"), External Depth (B): 2.66m (8' 8"), External Width (A): 4.34m (14' 2"), Ridge Height (D): 2.45m (8' 0")

Please Note: All sizes quoted are nominal

Overall External Dimensions: 7.64m x 3.57m (25' 0" x 11' 8")

External Width: 4.34m (14' 2")

External Depth: 2.66m (8' 8")

Internal Width: 4.10m (13' 5")

Internal Depth: 2.41m (7' 10")

Internal Area (m2): 9.89m2

Ridge Height: 2.49m (8' 2")

Internal Eaves Height Front: 2.18m (7' 1")

Internal Eaves Height Rear: 1.99m (6' 6")

Roof: Insulated IzoPanel

Roof Style: Pent

Roof Thickness: 135mm (100mm Insulated core)

Roof U-Value (W/m2k): 0.21

Wall Thicknesses: 120mm Walls

External Timber Thickness: 15mm Shiplap Cladding

Framing: 70mm Timber Stud Frame

Insulation Thickness: 25mm

Insulation Material: Polyurethane

Internal Finish: 10mm Gypsum Fibreboard

Floor:40mm Insulated Sandwich Panel

Floor Bearers: 35mm, Pressure Treated

Door Style: uPVC Patio Sliding Door

Locking System: Industry Leading 4 Point Lock - 2 Cams, Latch & Hook Bolt

Door Material: Reinforced 5 Chamber uPVC Profile

Door Height (Walkthrough Height): 1.91m (6' 3")

Door Width (Walkthrough Width): 0.66m (2' 1")

Windows: 3, Opening

Window Locking System: Multi Point with Mushroom Headed Espagnolettes

Window Opening Size: 0.43m x 1.371m (1' 5" x 4' 5")

Glazing Material: 28mm Double Glazed, Toughened Glass

Guarantee: 10 Years Against Rot and Insect Infestation

Assembly fixings & instructions: All included

Assembly Time: 4 - 5 Days This time is an approximation, based on two people building the basic product with no added extras. Assembly time may vary with additional items such as roof shingles, or external circumstances like the weather.


Our Helena garden office range has a specification far better than any competitor. This office has a secure 9-point locking system and wide opening, patio doors with a tall walkthrough height.

This range comes in left or right orientation depending on you layout choice.

This range also features large, 28mm thick double glazed windows with unique Dunster House domestic hinges along with multi-point locking. Unlike some competitors, we use polyurethane insulation in the walls roof and floor, not Rockwool or foil-backed bubble wrap.

We use polyurethane as we feel it's one of the best thermal insulators you can get.

The Helena garden office range comes in the following sizes:

  • 14x9
  • 18x9
  • 14x11
  • 18x11
  • 25x11
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