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Garden room project · Hargreaves Garden Spaces

Garden gym with Cedar & white render finishes

A 4m × 5m garden gym from the Hargreaves Garden Spaces Kensington range, built 3m tall for a treadmill and cross trainer, which meant a planning application.


Published 26 November 2022 · Updated 31 October 2026 · 2 minute read · Written by The Garden Room & Annexe Guide

3m tall garden gym finished with a striking mix of white render and Cedar cladding
Hargreaves Garden Spaces  4m × 5m garden gym, 3m tall

This stylish garden gym by Hargreaves Garden Spaces showcases their Kensington Range, blending sleek rendered sections with warm Cedar cladding. Measuring 3m in height, it provides ample headroom, making it ideal for treadmill and cross-trainer workouts.

At a glance

  • Size: 4m wide by 5m deep and 3m high, giving 500mm more ceiling height than the typical 2.5m garden room.
  • Planning: Being within 2m of the boundaries at this height meant a planning application; Hargreaves Garden Spaces supplied the elevation drawings, floor plans and specification, and permission was granted.
  • Foundation: Ground screws, with load tests carried out first to set their length and spacing for the building and the gym equipment.
  • Outside: White render matched to the house’s rendered extension and Canadian Western Red Cedar on the front, with paler British Cedar on the other three sides.
  • Company: Hargreaves Garden Spaces, who fitted Bluetooth-controlled heating, lighting that can be switched on from the house and a hardwired internet connection, and made the final electrical connections.

Part of our garden gym guide →

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Planning

Planning approval for a 3m-tall garden room

To accommodate gym equipment such as a treadmill and cross trainer, the clients opted for a 3m-tall garden room design. This height exceeds the typical 2.5m height for garden rooms, offering an additional 500mm of ceiling space.

As the building is positioned within 2m of the garden boundaries, a planning application was required. Hargreaves Garden Spaces supported the clients through the process, providing necessary elevation drawings, floor plans, and specification details.

Planning permission was granted for a 4m-wide by 5m-deep by 3m-high structure.

Foundation

Groundscrew foundation

The garden gym rests on a groundscrew foundation. Before construction began, load tests were conducted to ensure the screws’ length and spacing were sufficient to support the building and gym equipment. Unlike some companies that use a one-size-fits-all approach, Hargreaves Garden Spaces ensures tailored foundations for each project.

A ground load test was conducted before the ground screws were installed
The base  on ground screws, load-tested before installation
Exterior

White render & Cedar blend

Hargreaves Garden Spaces offers a variety of garden room styles, and this project showcases their Kensington Range. Its hallmark is the striking combination of white render and Canadian Western Red Cedar on the front elevation.

The clients matched the white render to their home’s existing rendered extension. Paired with the Cedar’s natural hues, the design is further accentuated by Anthracite grey door frames, creating a sharp, modern aesthetic.

British Cedar cladding, used on the other three elevations, complements the design with its paler tone and distinctive grain. While equally durable as its Canadian counterpart, British Cedar is more cost-effective, making it an excellent choice for less-visible sides of the building.

The white render and Cedar cladding have been beautifully detailed
Render and Western Red Cedar  on the front elevation
The white render and Cedar cladding have been beautifully detailed
Wall lights  where the render meets the Cedar
Inside

Smart heating and lighting

Inside, the gym has a smooth, plastered finish, akin to a room in a new build. Fully insulated for year-round comfort, it also features an electric heater with Bluetooth controls, enabling remote operation from the main house.

The lighting is similarly smart-owners can turn the lights on from the house, perfect for early morning or evening workouts.

For seamless connectivity, the gym is equipped with a hardwired internet connection, allowing the owners to stream classes, music, or shows without interruption.

As part of their turnkey service, Hargreaves Garden Spaces handled the final electrical connections, including cabling to link the garden room to the house and system testing.

Planning something similar?

Learn more about Hargreaves Garden Spaces

For more details about this project, contact Hargreaves Garden Spaces on 07584 626 911 or email info@hgspaces.co.uk. Explore their website to see more of their work.

Visit Hargreaves Garden Spaces More Hargreaves Garden Spaces projects
More projects like this Garden gyms Gyms with extra ceiling height Planning permission 20–30sqm garden rooms
Read the guides What garden rooms cost Permitted development Garden room ceiling height

Published 26 November 2022 · Photographs courtesy of Hargreaves Garden Spaces.

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