Tetra Garden Room

Dual aspect

The Tetra garden room boasts a striking design. With its dual aspect UPVC anthracite doors, the Tetra is designed to let in the most possible natural light and is the perfect garden room for spaces that benefit from an excellent view. Those looking for an office space that can accommodate multiple people will enjoy being able to make the most of dual doors.

With its unique, protruding roof the Tetra garden room is a stylish and contemporary bespoke garden room. Despite its sophisticated design and high-quality materials, the Tetra, like all our outdoor living room designs, is easy to maintain and perfect for any outdoor space.


See the Tetra garden room come to life

The Tetra is seamlessly designed to be a versatile garden room that you can use all year round to enjoy your valuable spare time. Learn how we built a bespoke garden room using the Tetra garden room design to create a dual office and relaxation space, providing the best of both worlds.

Your room. Your way.

The Tetra is unique in its dual aspect design, but you can make it even more bespoke to your needs using our extensive range of optional extras. From thermowood to redwood cedar, and coloured composite cladding on the exterior, to wood flooring and USB sockets inside; the possibilities are endless.

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Standard features

The Tetra garden room comes complete with a range of high quality, standard features.

  • Structure
    • High performance, fully installed ground screw foundations with 25-year guarantee on galvanising
    • EPDM rubber roof with a 50-year life expectancy
  • Insulation
    • Plastered walls and ceilings
    • Fully insulated with 100mm PIR foil faced board and 100mm Earthwool
    • All garden rooms are wrapped in top quality wind tight, water-resistant breather membrane
  • Electrical
    • Exterior up/down lights
    • Portable oil filled heater with timer
    • Full electrics that include 4 double sockets, interior panel lights and a 2-way consumer unit – site hook up is quoted separately
  • Doors & Windows
    • 1500mm anthracite UPVC French doors with A rated glass
  • Finishes & Trims
    • Tanalised redwood cladding
    • Finished in white matt emulsion
  • Flooring
    • Laminate floor in a colour and style of your choosing

Optional extras

Our optional extras are specially selected to help bring your project to life and make your garden room bespoke to you.

  • Base
    • Resin plate system for concrete slabs
  • Insulation
    • Upgrade for more acoustic sound insulation in walls and ceilings – perfect for music rooms, cinemas or office privacy
  • Electrical
    • Extra lighting and socket options
    • USB sockets
    • Downlighters
    • Exterior motion sensor
    • Cat 6 ethernet cable
  • Doors, Windows & Glazing
    • UPVC anthracite French doors in multiple sizes
    • UPVC anthracite
    • Slide doors in multiple sizes
    • Aluminium anthracite or black French doors in multiple sizes
    • Aluminium anthracite or black
    • Slide doors in multiple sizes
    • Aluminium anthracite or black Bifold doors
    • Selections of different styles and sizes to suit building
    • All seasons thermally efficient solar glass
    • Integrated blinds (within glass)
  • Cladding
    • Thermowood
    • Larch
    • Cedar
    • Composite cladding in a choice of colours
  • Flooring & Decking
    • Vinyl-click
    • Engineered wood floor
    • Anthracite composite decking

Fully customisable

Our commitment to building garden rooms that are bespoke to your needs is what sets us apart from our rivals. Everything from flooring to fascias, through to size and shape is fully customisable.


Any space. Any size.

The Custom Garden Rooms team are always up for a challenge. We use our years of industry experience and knowledge to create your perfect garden room in any space, and to fit any size.


Complies with permitted development rights

Garden rooms are not ‘habitable’ spaces, i.e., you aren’t living in one, so they do not require planning permission. This makes the project timelines for garden rooms infinitely quicker than annexes.


Do you have a question?

  • Do I need to get planning permission for a garden room?

    In most cases, our standard garden room buildings (up to 30sq metres) do not require planning permission as they are built to comply with permitted development rights. However, rooms that are ‘habitable’ such as bedrooms, do require planning permission and building regulations.

  • Can I use my garden room as an extra bedroom?

    Garden rooms are not intended for habitable living, but more for spaces that enrich your life. If you need a space built for living, we can help! For habitable rooms please look at our range of annexes.

  • Are electrics included?

    We included all electrics in our garden rooms. Hooking the electrics to the main property is an optional extra which can be quoted for prior to the project start date.

  • How do we proceed with an order?

    Once we’ve supplied you with a quote and you are happy with the project plans we will supply you with a payment schedule, start date and a contract.

See all our FAQS

Get started

Your project starts here. Punch in your estimated measurements below, then move on to the next steps.

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Cube Garden Room Design | Custom Garden Rooms


  • - Powerful simplicity
  • - Minimum 2m x 2m
  • - Best for offices
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Unilateral Garden Room Design | Custom Garden Rooms


  • - Seamless design
  • - Minimum 2m x 2m
  • - Best for a seamless look
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Symmetry Garden Room


  • - Perfectly balanced
  • - Minimum 2m x 2m
  • - Best for uniform-styled designs
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Tetra Garden Room


  • - Dual aspect
  • - Minimum 2m x 2m
  • - Best for making the most of light
Find out more


  • - Designed with character
  • - Minimum 2m x 2m
  • - Best for adding character
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The Multi – Line Drawing


  • - A versatile space
  • - Minimum 5m x 3m
  • - Best for dedicated, long spaces
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Garden Room Vs Garden Annexe | What's the Difference?


Photography Studio | 5m x 4m


Need inspiration?

We have a complete gallery of beautiful, custom garden rooms and annexes that we’ve created over the years. Why not take a look and get some fresh inspiration for your very own bespoke garden living space?