A countryside scene featuring a white house with a slate roof, surrounded by green trees, a fenced grassy yard, a phase garden room, and rolling green fields extending into the distance under a partly cloudy sky.

WORK | CREATE | RETREAT

design led cabins and saunas built from sustainable materials

Garden Rooms Plymouth

Garden rooms in Plymouth offer a practical way to create extra space at home without the disruption of building a traditional extension.

At Phase, we design and build high-quality garden rooms tailored to suit your space and how you plan to use it. Our garden rooms transform unused outdoor areas into spaces you'll enjoy every day. Our dedicated team supplies and installs across Plymouth, South Devon, and the wider South West.

If you're looking for a beautifully crafted, insulated outdoor buildings that genuinely adds value to your daily life, we'd love to hear from you.

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Ceiling with wooden panels and integrated LED lighting in a modern interior space
A suburban house with white exterior walls, a tiled roof, and several small windows, surrounded by trees and a fenced yard with parked cars and a garden bed with dried grass.
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 wooden building with sliding glass door, gravel pathway, green grass, and a rural landscape with trees, fields, and a blue sky with clouds.
Interior of a room with wooden walls and ceiling, a sliding glass door leading outside, a bed with a pale green quilt, a white cabinet, a small sink with a hand sanitizer, and various medical or therapy equipment, with a view of greenery and a fence
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.
A small wooden house with large windows and a glass door, set in a lush green yard with flower pots, surrounded by tall trees under a partly cloudy blue sky.
A modern black metal shed with a peaked roof and a closed roll-up door, surrounded by trees and a gravel path.
A bright, modern room with wood-paneled walls and ceiling, large windows showing an outdoor landscape, and various exercise and medical equipment, including a treatment bed, weights, and shelves with supplies.
A backyard with a white house, a sloped roof with tiles, a black car parked on the gravel driveway, and a small wooden structure with large windows. There are potted plants along the fence, green grass, trees, and a bright blue sky with a few clouds.
A music producer's home studio with drums, guitars, a keyboard, and a person working at a computer surrounded by audio equipment and soundproofing.
Interior of a wellness or rehabilitation center with treatment beds, exercise equipment, and shelving with organized baskets.
Interior of a modern residential kitchen and living space with white walls, wooden flooring, a wooden door, and a white ceiling with skylight and recessed lighting. There is a tall ladder, potted plants, a small kitchen counter with microwave, kettle
A construction site featuring a white crane truck lifting a garden room. The truck is beside green bushes and a partially built wooden house with large windows, surrounded by greenery and a blue sky with some clouds.
Close-up view of a wooden ladder against a blue sky with some clouds.

Why Choose Garden Rooms in Plymouth?

A garden room adds valuable space to your home without changing the main house. Set apart from your main living areas, it gives you a dedicated space for work, exercise, hobbies or relaxation.

These units can also provide the extra space you need, whether that’s a quiet home office, a creative studio, a private gym or a playroom for the children. A well-designed garden room can accommodate all of these uses, with the layout and finishes tailored to how you want to use it.

A garden building can also add value to your property. When it's finished to a high standard, it becomes a lasting additional space that can benefit both your lifestyle now and your home's appeal in the future.

Our Garden Room Range

Our garden rooms come in three sizes, so you can match the area to your plot and your plans.

Each is finished with tongue-and-groove panelling, a shadow-gap birch plywood ceiling and recessed LED lighting. Large sliding glass doors flood the room with light. View our cabin range:

Tǒmder (warmth)

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

View Tǒmder >

Lowarth (garden)

A compact garden room ideal for one person home working, yoga, reading, studying and quiet creative work.

View Lowarth >

Sodhva (office)

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

View Sodhva >

Studhla (studio)

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

View Studhla >

Each garden room 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!

Garden Offices for Working From Home

Garden offices are our most popular request. Working from a dedicated space in the garden can reduce household distractions and create a clearer separation between home and work.

For someone who needs a quiet place to focus, Lowarth offers a compact workspace with plenty of natural light and enough room for a desk and everything you need for the working day. Sodvha provides more room, making it a better fit for two people working together or for anyone who wants a little more space around them.

Both cabins are built for year-round use, so your office remains comfortable through the changing seasons. Recessed LED lighting and large sliding patio doors bring plenty of light into the room, while the garden outside provides a welcome break from the screen.

If you want an office that feels like part of your home rather than a shed with a desk, this is the right place to start.

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Garden Buildings Made to Last

A well-made garden building starts with how it is built. Every Phase cabin is made by hand in our Callington workshop, where our team can keep a close eye on the construction and finish before it leaves Cornwall.

Building indoors also means we are not relying on the weather. Your cabin is constructed in a controlled environment and delivered to your garden ready to install, keeping the work on site to a minimum.

You can even visit the workshop and see your cabin taking shape. Just get in touch beforehand, and we will arrange a suitable time. Every Phase cabin also comes with a 10-year structural warranty, giving you extra reassurance that your investment is built to last.

Do Garden Rooms Need Planning Permission?

Many garden rooms can be built under permitted development rights without making a full planning application. However, this depends on factors including the room's size, height, position within the garden and the type and location of the property.

For example, an outbuilding within two metres of a property boundary is generally limited to a maximum overall height of 2.5 metres if it is to fall within the relevant permitted development rules. Other restrictions also apply.

Permitted development rights can also be different or restricted for certain properties and locations, so it is always worth checking the requirements for your particular project before work begins. Learn more about planing permission for our garden rooms here.

Bespoke Garden Rooms for Your Outdoor Space

Your outdoor space is not the same as your neighbour's. The slope, the sun and the view all shape where a room should sit and how it should face.

We offer a range of fit and finish options, discussed with you before the build starts. That is what makes each room a bespoke garden room rather than an off-the-shelf box. Tell us how you plan to use it, and we will help you choose the right size and finish.

You can also visit our workshop by appointment to view our garden rooms, see the materials we use and discuss the options available for your own space.

How Our Installation Works

Once your cabin is ready, we handle the delivery from our workshop to your garden. Solid bases or ground screw foundations can be used to ensure a stable foundation. Our experienced installation team then assembles and finishes the cabin on-site. This process minimises any disruption to your garden, allowing you to quickly start enjoying your new space.

Most installations are completed within four to five days, although this can vary depending on the model and site. We can discuss delivery and installation dates with you early on, so you know what to expect as the project moves forward.

Our team knows each cabin inside and out, from its construction to the smallest finishing detail. This expertise helps us maintain the quality of the completed work and gives you a single team to deal with throughout the process.

The result is a flexible space that complements your home and garden and can become part of your life for many years to come.Skip the gym subscription and the drive. A garden gym opens up before sunrise and closes when you want it to. Our larger Sodhva and Studhla cabins are ideal for a full home gym setup with the option to add mirrored walls, durable flooring, and integrated power.

Create Your Garden Room With Phase

Need more room at home? A Phase cabin can transform an underused part of your garden into somewhere you can work, create or relax. Each structure is made to sit comfortably within its surroundings, giving you a practical addition that feels at home in the garden.

Phase is located in Cornwall and works with customers across the UK. Years of construction experience and a genuine interest in good design go into every project, from the first ideas through to delivery and installation.

Tell us what you have in mind, and we can talk through the options. Ready to create more space? Get in touch with Phase to start the conversation.

The good news is that many garden rooms can be built without planning permission, as they often fall under permitted development rights. However, there are a few things to consider, including the size and height of the building, where it sits in your garden and how close it is to neighbouring boundaries.

If your home is in a conservation area, an Area of Outstanding Natural Beauty (AONB) or is a listed building, there may be additional restrictions. How you plan to use the space can also make a difference, especially if it's for business purposes. For most garden rooms used as extra space at home, planning permission isn't usually needed, but it's always best to check first.

At Phase, we're happy to offer free advice and talk through any planning considerations before your project gets underway.

For more information, read our full guide to planning permission for garden rooms.

Planning Permission

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Your Questions, Answered

  • Cost depends on size, specification and finish. Insulation, glazing and cladding all affect the price. Request a quote, and we will give you a clear figure based on your plans. Phase cabins start from £8000 +VAT with saunas starting from £7000 +VAT

  • Most installations take around 4 to 5 days on site, depending on the model and site conditions. We will confirm expected manufacturing, delivery and installation times when you place your order. Installation can often be scheduled within four weeks.

  • Yes. Phase garden rooms are fully insulated and designed for year-round use. The insulation and glazing specification helps create a comfortable space throughout the seasons.

  • Yes. Garden rooms work well as home offices, gyms, playrooms and studios. We design the layout and electrics around the use you have in mind.

  • Garden rooms under 2.5 meters typically don't need planning permission. Many garden rooms can be built under permitted development rights, but this depends on their size, height, position and your property. Additional restrictions can also apply, so the requirements should be checked for your individual project before work begins. Learn more about planing permission for our garden buildingsbuildings here.

  • Every Phase garden room comes with a 10-year structural warranty as standard. Extra warranties apply to integrated systems, double glazing, and finishes based on manufacturer specifications.

CONTACT US

Email: office@phasedandb.com

Tel: 01579 560124

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

Four people are gathered in a room with light-colored wooden walls and ceiling. Two women and two men are engaged in conversation, smiling and gesturing. One woman is pointing towards a small control panel on the wall, while another holds a paper and a cup. The man on the right is holding a paper and a cup, wearing glasses and a checkered shirt. The person on the left is in profile, wearing a gray shirt, listening to the group.