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Garden room project · Cosy Garden Rooms

Pitched roof garden office built under Permitted Development

A 5m × 4m pitched roof garden office with a 3.2m ridge, sited more than 2m from the boundaries so it needed no planning, and shaped to echo the house's glazed extension.


Published 26 April 2025 · Updated 24 October 2026 · 3 minute read · Written by The Garden Room & Annexe Guide

Inside, the vaulted ceiling creates a light airy room
Inside  the vaulted ceiling

Opting for a pitched roofline when designing a garden office can transform the feel of the space. Unlike the flat ceilings typical of 2.5m mono-pitched garden rooms, a pitched roof creates a vaulted ceiling, making the room feel significantly more airy and spacious. Many people don’t realise that you can still build a pitched roof garden room under Permitted Development, provided it is sited at least 2 metres from each boundary. The rules specify that the building must not exceed 2.5 metres at the eaves and 4 metres at the ridge.

This project by Cosy Garden Rooms is an excellent example of how a pitched roof garden office can be achieved under Permitted Development. In this case, the ridge height is 3.2 metres, and the building has been positioned more than 2 metres from the boundaries of the garden. The pitch was carefully chosen to replicate the gable-end roofline of a glazed extension on the main house, allowing the new office to blend seamlessly with the existing property.

Watch the video of this Cosy Garden Rooms project
Video: the garden office from outside

At a glance

  • Size: 5m × 4m, with a 3.2m ridge.
  • Planning: Built under Permitted Development, more than 2m from each boundary.
  • Glazing: Triangular windows in the gable over sliding doors, a second glazed corner and a desk-height picture window.
  • Finishes: HardiePlank® with Anthracite Grey aluminium, softened by oiled Western Red Cedar slats.
  • Company: Cosy Garden Rooms, who built it in four days on site.

Part of our garden office guide →

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Inside

A light-filled, stylish garden office

The client’s vision was clear: they wanted a garden office that would harmonise with the architectural style of their home while offering a bright and versatile interior. As we can see, their choice of roofline has created an impressive office space. The combination of grooved panelled walls, a crisp white ceiling, and light grey laminate flooring has resulted in a wonderfully light and welcoming room – the perfect backdrop for their furnishings, workstation, and even exercise equipment.

Glazing

High-level glazing enhances the space

Another benefit of a pitched roof design is the opportunity to incorporate high-level glazing. In this project, Cosy Garden Rooms added triangular windows into the gable end above the centrally positioned sliding doors, which is both an attractive and effective feature. A second set of sliding doors, paired with a tall, narrow window on the left-hand side, has created a glazed corner that connects the interior beautifully with the garden. A picture window positioned at desk height frames another view, making the garden office feel truly embedded within its setting.

The 3d drawing for the pitched roof garden office showing the deck area to the side
The design: the office with the deck to the side.
Watch the video of this Cosy Garden Rooms project
Video: inside the garden office
Materials

Low-maintenance materials for long-term enjoyment

The building has been constructed with durability and low maintenance in mind. Cosy Garden Rooms are known for their robust concrete slab foundations, chosen for their long-term stability. In this case, the exterior has been clad in Hardie® Plank fibre cement boards, colour-matched with Anthracite Grey aluminium doors and windows. Hardie® Plank cladding is highly durable, dimensionally stable, and resistant to rot and fungal attack. It maintains its colour over time without the need for repainting, making it an excellent choice for busy homeowners.

A softening contrast to the dark cladding has been created with oiled Western Red Cedar slats, used on the right-hand wall cheek detail and the soffit of the gable end barge boards. Discreet LED lighting has been incorporated into the soffit detail, creating an inviting glow in the evenings.

The pitched roof garden office has a ridge height of 3.2m and was sited more than 2m from the boundaries under the Permitted Development rules
Cosy Garden Rooms  pitched roof office, 3.2m ridge
Oiled cedar slats with LED lighting have been fitted in the soffits
Cedar soffits  with LED lighting
The build

Built with care, ready to enjoy

This 5m x 4m garden office was built in just four days on-site, showcasing the efficiency of Cosy Garden Rooms‘ process. Their turnkey service covers everything, including the final electrical connection to the house mains supply, so the new space is ready to move into and enjoy immediately.

As a thoughtful finishing touch, a new black composite deck was installed to the side of the structure, and during the build, an existing wooden gazebo was removed while carefully preserving and retraining the customer’s established wisteria to grow over the new garden office.

The garden office replicates the style of the glazed extension on the main house
Echoing the house  its glazed extension
Planning something similar?

Learn more about Cosy Garden Rooms

To learn more about creating a pitched roof garden office, chat with the Cosy Garden Rooms team on 0115 77 22 715 or by emailing info@cosygardenrooms.co.uk. Explore www.cosygardenrooms.co.uk to learn more about their options.

Visit Cosy Garden Rooms More Cosy Garden Rooms projects
More projects like this Garden offices Pitched roof garden rooms Composite cladding 10–20sqm garden rooms
Read the guides What garden rooms cost Permitted development What is a garden room?

Published 26 April 2025 · Photographs courtesy of Cosy Garden Rooms.

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