Music studio with drums, guitars, microphones, and electronic equipment, including a computer monitor, keyboard, and audio gear, in a room with acoustic foam panels and hanging cables.

WORK | CREATE | RETREAT

design led cabins and saunas built from sustainable materials

Garden Buildings Cornwall

Modern homes are evolving, and many homeowners are looking for smarter ways to create extra space without the disruption of a traditional extension. At Phase Cabins and Saunas, we design and build bespoke garden buildings in Cornwall that combine contemporary architecture, practical living and long-term comfort.

From compact wellness retreats and garden rooms to spacious studios, home offices and multi-purpose outdoor buildings, every Phase cabin is designed to improve the way people live, work and relax every day.

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A garden room building with sliding glass doors, situated outdoors on a gravel foundation, surrounded by green trees and open fields under a cloudy sky.
A large white truck with a crane lifting a cabin. The scene is outdoors with green trees and a cloudy sky in the background.
Ceiling with wooden panels and integrated LED lighting in a modern interior space
A wooden structure with sliding glass doors in a workshop or construction space, with tools and materials around.
An empty room with light wood walls and flooring, a window with black frame, and sliding doors with white panels and black frames.
Construction workers operate a forklift moving a large modular building garden room cabin with wooden exterior walls. One worker is seated inside the forklift, while others stand nearby, observing the process.
A modern small building or shed with metal siding and glass doors, surrounded by trees and greenery, with reflections of the sky and trees in the glass. There is a glass greenhouse attached to the side of the building.
A truck with a crane lifting a frame into a residential construction site, with a cabin garden room structure and workers visible.
A music producer's home studio with drums, guitars, a keyboard, and a person working at a computer surrounded by audio equipment and soundproofing.
A modern black metal shed with a peaked roof and a closed roll-up door, surrounded by trees and a gravel path.
A crane lifting a garden room cabin onto a flatbed truck in a parking lot, with workers guiding the process and white garage buildings on either side.
Living room with large sliding glass door, a potted plant, a sofa with cushions, a wooden sideboard, and a window with blinds letting in sunlight.
Two men are working with a forklift truck, moving a garden room cabin or container, with multiple retail units or warehouses in the background.
Close-up of a doorway with a black metal frame, surrounded by light-colored wooden paneling on the left, and a darker wooden trim at the top, with an interior in the background showing white walls and a small white electrical box.
A man with short hair wearing a gray T-shirt working on an electrical outlet installation inside a wooden-walled room. He appears to be connecting wires to the outlet. In the foreground, there is a piece of equipment or a device with visible wires.
Close-up view of a wooden ladder against a blue sky with some clouds.
Two men are working with a forklift to position a garden room cabin outside a warehouse. The warehouse has a metal exterior with signs reading 'archiCO' and 'PHASE design and build'. The scene is set in a parking lot.

Bespoke Garden Buildings Designed Around Lifestyle

No two projects are the same, which is why every Phase cabin is designed around how each customer intends to use the space.

Our cabins are available in a range of carefully designed fixed sizes, while the internal layout, finishes, materials and features can all be tailored to suit your lifestyle, aesthetic and practical requirements.

Some people choose compact garden rooms for peaceful offices or creative studios away from the distractions of the main house. Others create private gyms, wellness areas, entertainment spaces or flexible rooms where children, family and friends can spend time together throughout the year.

Our range includes four core cabin options, each designed to suit different uses, layouts and outdoor spaces:

Tǒmder

A contemporary home sauna designed to create a private wellness retreat within your garden.

View Tǒmder >

Sodhva

A larger multi-purpose building suited to modern living, fitness, entertainment and adaptable family use.

View Sodhva >

Lowarth

A compact detached garden room ideal for home offices, yoga, reading, studying and quiet creative work.

View Lowarth >

Studhla

Our largest studio-style cabin designed for entertaining, shared workspaces and premium lifestyle use.

View Studhla >

Each building is manufactured in Cornwall and delivered nationwide with carefully considered fit and finish options available.

Watch our video to explore how we deliver our cabins and saunas to your door!

Planning Permission and Advice

Many outdoor buildings fall within permitted development rights, meaning formal planning permission is often not required depending on size, positioning and intended use.

Some locations around St Ives, Truro, Falmouth, Newquay and St Austell may involve additional planning considerations, particularly within conservation areas or protected landscapes.

We can answer questions early in the process, provide free advice specific to your home and guide you through each step before construction begins.

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A small wooden tiny house with large sliding glass doors and a window, situated outdoors amidst trees and rural landscape.

Why Choose Phase Cabins and Saunas?

At Phase, we believe outdoor spaces should work harder for modern living. Every cabin is built to balance aesthetics, functionality and long-term value whilst creating spaces people genuinely enjoy spending time in. Whether you are looking for an external office space, wellness retreat, studio or flexible family room, we provide beautifully crafted garden rooms in Cornwall that combine contemporary living with practical everyday use.

Our company has built a strong reputation for creating bespoke timber buildings to an exceptional standard, helping customers find the right products, layouts and finish options for their outdoor space.

Garden Rooms Built for Year Round Use

A modern garden room should feel like a genuine extension of your property rather than a temporary outdoor structure.

Our insulated cabins are built using responsibly sourced timber, durable materials and carefully considered construction methods that support low maintenance ownership and year round comfort.

Heating, lighting and electrical systems can all be integrated depending on how the building will be used. Whether creating a peaceful office, private wellness retreat or flexible family space, every cabin is designed for comfortable everyday use throughout every season.

Designed and Built in Cornwall

All Phase cabins and saunas are manufactured within our Cornwall workshop by a dedicated team focused on quality craftsmanship and attention to detail. Every garden building and sauna also comes with a 10 year structural warranty.

We take pride in creating garden rooms Cornwall homeowners genuinely enjoy using every day whilst helping customers turn ideas and dreams into reality.

From initial discussions and material choice through to installation and aftercare advice, every project is approached with care and professionalism.

Your Questions, Answered

  • Yes, all of our insulated cabins and garden rooms are built for comfortable use throughout the year. We're so proud of our quality we offer a 10 year structural warranty on all garden buildings and saunas.

  • Most projects are completed quickly once site preparation is finished. Cabins are manufactured off-site and craned into position, leaving only final service connections and finishing touches to complete on-site. Lead times typically range from 3 to 5 weeks depending on the chosen building and specification.

  • Many of our cabins use groundscrew foundations which minimise disruption to the garden whilst giving a strong and reliable base for the unit. We can also carry out any necessary groundwork required for your garden building, making the entire process as smooth, stress free and enjoyable as possible.

  • Garden rooms can sometimes be used for occasional accommodation depending on the intended use and local planning conditions. Learn more about planning permission in Cornwall here.

  • Yes, larger cabins such as Studhla can incorporate shower rooms, toilets and kitchenette areas depending on the chosen specification.

  • Yes, customers are welcome to discuss ideas, ask questions and view finish and material options during the manufacturing process.

CONTACT US

Email: office@phasedandb.com

Tel: 01579 560124

Unit 18 Trelawney Business Park, Callington, Cornwall, PL17 7SD

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