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Garden room project · Swift Unlimited

Owner extends their garden room with a sauna

A family garden room with bi-folds, a floor-to-ceiling side window and a cloakroom, extended a year later with an insulated sauna and a cold-water shower.


Published 14 November 2015 · Updated 25 October 2026 · 2 minute read · Written by The Garden Room & Annexe Guide

Contemporary garden room by Swift Unlimited
Swift Unlimited  the original family garden room

The design brief was to create a versatile space where the family could unwind, work, or socialise. Whether it was enjoying a quiet Sunday morning with the papers, working on a laptop in a setting more inspiring than the dining room table, or providing a peaceful spot for the kids to do homework or entertain friends, this garden room needed to meet a variety of needs.

Although the garden is generously sized, the design had to blend harmoniously with its surroundings and enhance the view from the main house. To achieve this, Swift Unlimited incorporated a large set of bi-fold doors, ensuring a seamless connection between the interior and the rolling lawns. A floor-to-ceiling side window was also added, providing uninterrupted views through the building to the scenic backdrop beyond.

At a glance

  • Built for: A family wanting one room to relax in, work on a laptop, do homework or have friends round.
  • Glazing: A large set of bi-folds onto the lawn and a floor-to-ceiling side window, so the view from the house runs through the building.
  • Inside: Engineered wood flooring, one wall in rough sawn timber stained to match it, Farrow & Ball paint elsewhere, and a cloakroom with toilet and basin connected to the septic tank.
  • The sauna: Added a year later as an insulated extension with doors clad to match, a slightly dropped EPDM roof, slatted cedar panels and a cold-water shower.
  • Company: Swift Unlimited, who also extended the decking and added exterior lighting when the sauna went in.

Part of our garden family room guide →

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Inside

Practical features with stylish details

To make the garden room even more functional, a compact cloakroom with a toilet and basin was included without encroaching on the main living area. Swift Unlimited handled the entire process, from installing the sanitary ware to connecting the plumbing to the property’s septic tank system.

For the interior, the clients had a clear vision. They chose engineered wood flooring for durability and warmth and requested rough sawn timber cladding for one wall, later stained to complement the flooring. The remaining walls were painted in elegant Farrow & Ball colours for a timeless finish.

Inside the garden room family room by Swift Unlimited
Inside  rough sawn timber on one wall
The sauna

Adding a sauna: a luxury upgrade

A year after the garden room’s completion, the owners decided to add a sauna to their outdoor retreat. Swift Unlimited enthusiastically took on the challenge, designing an extension that would harmonise perfectly with the existing structure.

The sauna extension was carefully insulated and featured doors clad to match the original garden room. To ensure structural integrity, a slightly dropped EPDM-covered roof was implemented. The decking was extended, and exterior lighting was added for a cohesive and practical outdoor space.

The new extension also boasts a cold-water shower and slatted cedar panels, providing both privacy and a touch of luxury.

This garden room incorporates a sauna
The sauna extension  beside the original room
Inside the Swift Unlimited designed Sauna
Inside the sauna
Inside the Swift Unlimited designed Sauna
The sauna heater
A sauna can be incorporated into a garden room
Through to the sauna
The design is completed with an outdoor shower
The cold-water shower  on the outside of the extension
The result

A striking addition to a versatile garden room

This sauna extension enhances an already impressive garden room, combining function and style. It stands as an example of how bespoke design can transform a simple garden space into a luxurious and practical retreat.

The sauna extension blends with the original building
Clad to match  the sauna beside the original room
Planning something similar?

Learn more about Swift Unlimited

Discover how Swift Unlimited can bring your garden room vision to life. Contact the Swift Unlimited team on 01625 875 588 or email support@swiftunlimited.co.uk. Visit www.swiftorg.co.uk to explore more examples of their stunning projects.

Visit Swift Unlimited More Swift Unlimited projects
More projects like this Garden family rooms Garden gyms
Read the guides What garden rooms cost Permitted development Buying a garden gym

Published 14 November 2015 · Photographs courtesy of Swift Unlimited.

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