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Garden room project · Ark Design Build

Garden office shed combo

A 5m × 3m Thermowood office with a 1.2m-wide store behind a door whose boards line up with the walls.


Published 10 May 2019 · Updated 23 October 2026 · 3 minute read · Written by The Garden Room & Annexe Guide

Thermowood clad garden office with shed
Ark Design Build  5m × 3m office and shed

At first glance, this 5m x 3m building by Ark Design Build looks like a simple home office. Look closely, however, and you’ll spot a hidden door leading to a storage room.

Combining two functions under one roof is an efficient use of space. By eliminating the need for a separate garden shed, you can streamline the layout and keep your garden looking less cluttered.

The storage shed in this design measures 1.2m wide and runs the full depth of the building, making it slightly larger than the average garden shed. All Ark Design Build garden offices are made to measure, so the storage area can be customised to any size you prefer.

As standard, Ark Design Build finishes the interiors of their offices with plastered and decorated walls, creating a space that feels like a room in a new house. The storage areas, however, are finished with a practical OSB (oriented strand board) lining. OSB is a durable material, perfect for the wear and tear of a shed. Being a structural board, it’s also ideal for adding hooks and shelves to maximise the space.

5m x 3m garden office with secret shed
The hidden door

At a glance

  • Size: 5m × 3m, with a 1.2m-wide store.
  • Built for: A home office and garden storage under one roof.
  • Construction: Made to measure, priced including foundations and the mains connection.
  • Finishes: Thermowood outside; plaster in the office, OSB in the store.
  • Company: Ark Design Build, with heating and Cat6 cabling as standard.

Part of our garden office guide →

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Outside

Thermowood cladding adds character

The exterior of the garden office is clad in Thermowood, an engineered softwood known for its long-lasting, low-maintenance properties. Thermowood is a more affordable alternative to Cedar cladding, while still offering a natural grain that adds plenty of character to the building.

The door to the storage room is carefully designed to blend seamlessly with the rest of the building. The Ark Design Build team have aligned the boards on the door with those on the walls, making it almost invisible.

Where they work

Garden rooms in Kent & surrounding areas

Ark Design Build specialises in garden room projects across Kent, East Sussex, and parts of Essex. They offer their services on a turnkey basis, managing the entire project from foundation installation through to final electrical connections.

Pricing

No hidden extras

Ark Design Build prides itself on transparency. After conducting a site visit and understanding your vision, they’ll provide a comprehensive price for the complete project.

This price includes the foundation system and the final electrical connection to the mains supply-both of which are often considered extras by other companies. Ark Design Build also includes many useful features as standard, such as Cat6 data cabling for reliable internet connections and heating, again often considered extras elsewhere.

Planning something similar?

Learn more about Ark Design Build

Ark Design Build operates in Kent, East Sussex, and parts of Essex. To learn more about creating a garden office, contact the Ark Design Build team on 07896 196 718 or email them at contact@arkdesignbuild.co.uk. Visit www.arkdesignbuild.co.uk to explore more of their work.

Visit Ark Design Build More Ark Design Build projects
More projects like this Garden offices Offices with storage Garden rooms with storage 10–20sqm garden rooms
Read the guides What garden rooms cost Permitted development What is a garden room?

Published 10 May 2019 · Photographs courtesy of Ark Design Build.

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