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Garden room project · Executive Garden Rooms

Bespoke garden gym and office with cassette toilet

A 9m × 4m building in Poole by Executive Garden Rooms, divided into a home gym, a smaller office with its own door, and a cloakroom.


Published 21 October 2025 · Updated 31 October 2026 · 3 minute read · Written by The Garden Room & Annexe Guide

The exterior of the building was finished in low maintenance composite cladding
Executive Garden Rooms  9m × 4m gym and office in Poole

This spacious 9m x 4m bespoke garden room in Poole has been cleverly designed to serve as both a home gym and an office. The internal layout has been divided into three rooms – the main gym area, a smaller office, and a cloakroom – creating a versatile workspace and fitness retreat in one contemporary building.

At a glance

  • Layout: A 9m × 4m building split into three rooms, with the office and cloakroom leading off the main gym.
  • Glazing: French doors with fixed side panels and a large picture window light the gym, while the office has its own glazed door so it can be used on its own.
  • Cloakroom: A cassette toilet with a flush tank and ceramic bowl, chosen because a manhole behind the house had been built over and a mains connection was not possible.
  • Exterior: Composite weatherboard cladding, Anthracite Grey frames, and a canopy with downlights sheltering both entrances.
  • Company: Executive Garden Rooms, who built it on a reinforced concrete foundation in three weeks and made the final electrical connection to the house.

Part of our garden gym guide →

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Layout

Bespoke layout designed around the client’s requirements

As bespoke garden room designers, Executive Garden Rooms work with each client to create a layout that perfectly suits their needs. Whether you’re looking for one large open space or a building divided into multiple rooms, their team can configure the internal layout to make the most of every square meter.

In this case, the owners wanted separate areas for work and exercise, and Executive Garden Rooms achieved this through thoughtful design.

the main room serves as a home gym with the office and cloakroom leading off this space
The gym  with the office and cloakroom leading off it
Glazing

Light-filled rooms with a connection to the garden

The arrangement of glazing gives each room a wonderfully light feel and an inviting connection with the garden. The gym area features a pair of outward-opening French doors with fixed side panels, allowing for excellent natural light and ventilation. A large picture window on the right-hand elevation enhances this further, creating a bright environment for workouts.

The rooms have a wonderfully light and airy feel thanks to the mix of glazing
Mixed glazing  lighting the gym and the office

The home office has its own dedicated entrance via a single-glazed door, allowing it to be used independently from the gym. Each door and window has been fitted with blinds to control privacy and light levels, while the cloakroom features a high-level opening window for additional ventilation.

A comfortable home office space has been created
The office  with its own entrance

Externally, all doors and windows are finished in Anthracite Grey, while the interior faces are white uPVC, maintaining a fresh and modern look throughout.

Exterior

Contemporary exterior with low-maintenance weatherboard cladding

The exterior is finished with composite weatherboard cladding – an excellent choice for a low-maintenance garden room. This cladding has a ‘0’ fire rating and a durable painted look that won’t fade, offering both safety and long-term visual appeal.

A roof canopy extends beyond the front elevation, providing shelter over the entrances to the gym and office. Recessed downlights have been set into the canopy, creating a welcoming atmosphere after dark.

Interior

High-quality interior finishes and electrical specification

Inside, the building has been finished to a high standard with plastered and decorated walls and ceiling, and a durable laminate floor – giving the rooms the look and feel of those in a well-specified new home.

Executive Garden Rooms tailor every electrical layout to the client’s needs, including power sockets, LED downlights, Cat6 data points, and external security lighting. Heating and a smoke detector have also been installed to ensure year-round comfort and safety. As part of their turnkey service, the team includes the final electrical connection to the main house supply.

The cloakroom

Cloakroom solution with cassette toilet system

Because a manhole at the rear of the house had been built over by a previous owner, a conventional mains-connected toilet wasn’t possible. Executive Garden Rooms proposed a practical alternative – a cassette toilet system.

A cloakroom with cassette toilet has been install as access to the mains services was not an option
The cloakroom  with a cassette toilet and heated towel rail

This modern unit includes an integrated flush tank and ceramic bowl, offering convenience without the need for complex groundwork. The cloakroom also includes a hand sanitiser unit and a heated towel rail, providing all the essentials in a compact, hygienic space. Cassette toilets are easy to maintain and have proved a popular choice in other Executive Garden Rooms projects where mains access is limited.

Foundations

Built to last

The building sits on a reinforced concrete foundation, which prevents nesting opportunities for rodents or foxes and ensures long-term structural stability. As with all Executive Garden Rooms projects, the build was completed to the highest standards – and in just three weeks.

Planning something similar?

Learn more about Executive Garden Rooms

Executive Garden Rooms offer a fully managed turnkey service, handling everything from design to final connection. To explore their bespoke garden room designs, contact their friendly team on 01202 874 766 or email info@executivegardenrooms.co.uk. You can also learn more about their approach at www.executivegardenrooms.co.uk.

We’ve featured many of their projects over the years – take a look through our Executive Garden Rooms archive to see more examples of their craftsmanship.

Visit Executive Garden Rooms More Executive Garden Rooms projects
More projects like this Garden gyms Multi-use garden gyms Garden offices Offices with a cloakroom Garden rooms with a canopy Composite cladding 30sqm+ garden rooms
Read the guides What garden rooms cost Permitted development Buying a garden gym

Published 21 October 2025 · Photographs courtesy of Executive Garden Rooms.

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