• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
The Garden Room & Annexe Guide Logo
Visit the Swift Unlimited website
  • Buyers Guide
        • Introduction
          • What is a garden room?
          • How to buy a garden room
          • Buyers doubts
          • Pre-designed garden rooms
          • Modular garden rooms
        • Rules & Regulations
          • Garden Room Planning Permission Guide
          • Permitted Development Overview
          • Building Regulations
        • Build & Installation
          • Off-site construction
          • Complete on-site builds
          • Garden rooms can be craned in
          • Garden room shell builds
          • Turnkey projects
        • Design Consultations
          • Start designing your garden room
          • What to expect from a design consultation
          • Buying a garden room online
          • Comparing garden room quotes
  • Garden Rooms
        • Examples By Company
          • A to Z of Companies
        • Examples By Use
          • Small Garden Rooms
          • Garden Offices
          • Garden Gyms
          • Art & Creative Studios
          • Soundproof Garden Studios
          • Granny Annexes
          • Explore More Uses
        • Examples by Design Feature
          • With Storage Room
          • With Toilet or Shower Room
          • With Composite Cladding
          • With Canopy
          • With Covered Seating Area
          • With Pitched Roof
  • Garden Living Annexes
        • By Footprint Size
          • Less than 25sqm
          • 25sqm to 35sqm
          • 35sqm to 45sqm
          • 45sqm to 55sqm
          • 55sqm and Above
        • By Room Layout
          • Garden Bedroom
          • Open Plan
          • One Bedroom
          • Two Bedroom
          • 3 and 4 Bedroom
        • Useful Guides
          • How Much Does a Granny Annexe Cost?
          • Visit Annexe Show Buildings
  • Price Guides
        • Price Guides
          • Garden Room UK Price Guide
          • How much do garden rooms cost?
          • How much do bespoke garden rooms cost?
          • How Much Does a Granny Annexe Cost?
          • Do Garden Rooms Add Value to Your Home?
        • Budgeting & Payments
          • Setting a budget for a garden room
          • Maximise your budget
          • Paying for a garden room
          • Protecting your investment
        • Finance & Deals
          • Garden room finance options
          • Renting a Garden Office
          • Second-hand garden rooms
          • Special Offers
  • Directory
  • About Us
        • About Us
          • Our Story
          • Work With Us
          • Newsletter
        • Contact Us
          • Our Contact Details
        • Website Policies
          • Revisit Your Cookie Settings
          • Cookie Policy
          • Privacy Policy
          • Acceptable Use Policy
          • Website Terms of Use
  • Your Guide

Garden Annexe Office and Gym

Garden Annexe Office and Gym

Published: 4 October 2024
Reading Time: 2 minutes 30 seconds

This stylish home office and gym in Kent was designed and built by the bespoke design specialists Ark Design Build. It reflects the growing trend of creating fully insulated outdoor spaces that serve multiple purposes within a single, thoughtfully designed structure.

Two sets of bi-fold doors open the room out onto the garden

The 50sqm building, measuring 10m x 5m, provides ample space for both work and fitness. It also features a shower room, making the building self-contained and independent from the main house, along with a useful storage room. Due to its size, the project needed to comply with Building Regulation standards, which apply to garden buildings over 30sqm.

When exploring your options, it's important to note that not all garden room ranges are designed to meet Building Regulation standards as standard. Specialist companies like Ark Design Build can adapt their designs to ensure compliance with the insulation, structural, and fire safety standards required for new homes.

Rather than referring to this structure as a ‘garden room,’ it is more accurately described as a ‘garden annexe,’ reflecting the higher level of specification needed for habitable spaces. Ark Design Build have extensive experience in creating both garden rooms and garden annexes, with a focus on projects in Kent.

3m Tall Garden Office & Gym

This bespoke garden office and gym building is taller than most garden room designs, which typically have a maximum external height of 2.5m to allow flexibility in positioning under Permitted Development rules.

When building a home gym, many people seek a taller structure to increase the ceiling height inside, offering greater headroom for gym equipment. Over the years, Ark Design Build have completed several projects with higher ceilings to provide this extra space.

Ark Design Build handled the planning permission application as part of their comprehensive service, ensuring the project ran smoothly from start to finish.

Open Plan, Multifunctional Space

As the photos show, a stunning open-plan room has been created, enjoying a wonderful connection with the garden thanks to two sets of bi-fold doors that slide to one side, opening large sections of the wall to the outdoors.

The interior of the room features high-spec finishes

The shower room is discreetly positioned in the left-hand corner of the space. Ark Design Build work closely with their clients to tailor the layout and finishes to suit individual tastes and requirements. While some companies ask clients to organise groundworks and connections for shower rooms with another company, Ark Design Build handle these aspects as part of their turnkey service.

The annexe is self contained from the main house thanks to the inclusion of a shower room

The main room feels like a well-specified new-build home, with plastered and decorated walls and ceilings, paired with wooden flooring. A wood burner has been installed, ensuring the space stays cosy on cold days, while air conditioning provides comfort during warmer months, allowing the owners to set their ideal working and exercise environment.

Black Thermowood Cladding

Externally, the garden office and gym annexe is finished in black, which serves as the perfect contrast to the natural colours of the garden.

Thermowood cladding has been painted black for a monochrome look

The walls are clad in Thermowood, installed vertically for a contemporary look. Thermowood is a softwood treated at high temperatures to significantly enhance its durability, offering a lifespan of many decades. Left untreated, Thermowood has a honey-brown colour, but to achieve the monochrome look, Ark Design Build applied Black Bedec Barn paint, a tough, durable, microporous coating with excellent colour retention.

Learn More

To learn more about creating a garden annexe in Kent, you can contact Ark Design Build on 07896 196 718 or by emailing contact@arkdesignbuild.co.uk. Explore their bespoke design services at www.arkdesignbuild.co.uk.

Visit the Garden Spaces website
Visit the Timeless Garden Rooms website
Visit the Garden2Office website
Uniquely designed
garden rooms
Pre-designed options
from £19,520
Or bespoke — tailored to
your use & garden
No planning permission
in most cases
Based in Brighton & Hove,
building across England
Explore options →
Visit the Modern Garden Offices website

Primary Sidebar

Visit the Garden Annexes website to explore their homes in the garden
Visit the Garden Spaces website
Visit the Bridge Garden Rooms website
Visit the Ark Design/Build website
Visit the Modern Garden Rooms website
Uniquely designed
garden rooms
Pre-designed options
from £19,520
Or bespoke — tailored to
your use & garden
No planning permission
in most cases
Based in Brighton & Hove,
building across England
Explore options →
Explore the Cosy Garden Rooms website to learn more

Useful Links

Planning Permission Guides

A to Z of Companies

Garden Rooms

Garden Living Annexes

Garden Room & Annexe Directory

Contact Us

Contact Us

Work with Us

Website Policies

© 2026 The Garden Room & Annexe Guide. All Rights Reserved.
The Garden Room & Annexe Guide is powered by the team at Square Meter Media Limited