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Garden room project · Ark Design Build

Contemporary garden office with an apex roof

A 6m × 4m office under a 3.8m apex roof, with a toilet, a kitchenette and slate-effect tiles.


Published 1 March 2020 · Updated 23 October 2026 · 3 minute read · Written by The Garden Room & Annexe Guide

Garden office with apex roof by Ark Design Build
Ark Design Build  6m × 4m, apex roof

While mono-pitched garden rooms are incredibly versatile, it’s always exciting to explore designs with an apex roofline. The pitched roof adds character and enhances the overall feel of the building.

This contemporary garden office with an apex roof, designed by Ark Design Build, is self-contained with a toilet and small kitchenette. This not only futureproofs the space but also increases its versatility and usability.

At a glance

  • Size: 6m × 4m, 3.8m at the ridge.
  • Built for: Working from home, self-contained with a toilet and kitchenette.
  • Construction: Ground screws, a vaulted ceiling and Tapco slate-effect roof tiles.
  • Finishes: Thermowood and grey aluminium frames; plaster, exposed beams and wooden floors inside.
  • Company: Ark Design Build, who connected the electrics, internet and plumbing.

Part of our garden office guide →

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Size

6m x 4m garden office

Measuring 6 metres wide by 4 metres deep, this garden office provides a generous amount of space. The pitched roofline creates a vaulted ceiling, adding to the room’s sense of openness.

The exposed roof beams bring a touch of character to the otherwise modern interior. Ark Design Build plastered and decorated the space, and combined with the wooden flooring, a light and contemporary atmosphere has been created.

Garden office with vaulted ceiling
The vaulted ceiling

At its highest point, the ridge reaches 3.8 metres. To construct a similar office under Permitted Development rules, it would need to be situated at least 2 metres from any boundary. Otherwise, planning permission would be required.

The roof

Lightweight slate-effect roof tiles

The office’s roof has been beautifully finished with lightweight slate-effect tiles called Tapco. These tiles are made from plastic but closely resemble natural slate in both colour and texture. A key benefit of Tapco tiles is their lightweight nature, making them easier to install. They also have a lifespan of over 40 years.

The garden office is 3.8m tall at the ridge
3.8m at the ridge
Glazing

High-spec aluminium doors and windows

The grey tone of the roof has been matched with the finish of the doors and windows. Ark Design Build installed high-spec, powder-coated aluminium doors and windows.

Pitched roof garden office with lightweight slate tiles
Slate-effect tiles

A casement window has been placed on the end wall, while the front features a wide set of bi-fold doors. These doors open fully, leading onto a grey composite decked veranda, creating a seamless transition between the indoor and outdoor spaces.

Garden office with bi-fold doors
The bi-folds
Bifold doors open up onto a composite deck
Onto the deck
Outside

Low maintenance Thermowood cladding

The exterior of the garden office has been clad in Thermowood, a durable, low-maintenance option. Thermowood is treated at high temperatures to make it resistant to rot and fungal decay.

When first installed, Thermowood has a warm honey-brown colour. However, if left untreated, it will naturally weather to a silver-grey hue due to UV exposure. This weathering does not impact the cladding’s long-term durability.

Garden office fitted with aluminium bi-fold doors
Aluminium bi-folds
Inside

Garden office with toilet and kitchenette

Garden offices with toilets and kitchenettes are becoming increasingly popular, making the building entirely self-contained from the main house. Ark Design Build cleverly partitioned the WC into one corner, with the kitchenette on the opposite side, maximising space without compromising the main room’s functionality.

Garden office with compact kitchenette
The kitchenette
Garden office with toilet
The toilet

Ark Design Build also managed all the necessary groundworks, connecting the toilet and kitchenette to the mains services.

The company

A turnkey project

This garden office was completed as a turnkey project by Ark Design Build. They handled every aspect of the build, from installing the ground screw foundations to connecting the electrics, internet, and plumbing for the toilet and kitchenette.

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 pitched roof garden room, 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 Garden rooms with a shower room Pitched roof garden rooms 20–30sqm garden rooms
Read the guides What garden rooms cost Permitted development Building Regulations

Published 1 March 2020 · Photographs courtesy of Ark Design Build.

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