Unilateral Garden Room

Seamless design

A sleek garden room with a projecting roof, the Unilateral garden room design is ideal for any garden and any use. As with all our garden rooms, the Unilateral can be used as a ‘base design’ that’s customised to suit your needs.

The projecting roof on the Unilateral custom room is a popular choice for those who want to add decking to the area surrounding their garden room. This combination makes the perfect patio space for sitting outside, growing plants or adding stylish garden ornaments to complement your cedar garden room.

Bespoke Garden Pods | Custom Garden Rooms

See the Unilateral garden room come to life

The Unilateral garden room can be tailored to suit a variety of uses, from salons to dog groomers, yoga studios and man-caves, what you want to use your custom garden room for is completely up to you! Learn how we built a photography studio that doubles as an office using the Unilateral model garden room.

Your room. Your way.

The Unilateral is seamless in it’s current design, but you can make it yours using our extensive range of optional extras. From thermowood, cedar, composite cladding and larch on the exterior, to wood flooring and USB sockets inside, the possibilities are endless with this outdoor living space design.


Overhang protects front elevation from weathering over time1500mm anthracite UPVC French doors with A rated glassOverhang can be made to any side, typically this protrudes to 500mm

Standard features

The Unilateral 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 and 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?

See all our FAQS

Get started

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

Get quote

Cube Garden Room Design | Custom Garden Rooms


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


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


  • - Perfectly balanced
  • - Minimum 2m x 2m
  • - Best for uniform-styled designs
Find out more
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
Find out more
The Multi – Line Drawing


  • - A versatile space
  • - Minimum 5m x 3m
  • - Best for dedicated, long spaces
Find out more

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?