Garden Annexes

Designed for living. Built for life.

A garden annexe, also known as a granny flat, is a self-contained living space. They are a popular and 
cost-effective way to create additional living areas for extended family members, older children, guests or even as an Air BnB.

Just like our garden rooms, our bespoke annexes are fully customisable. Whilst we have 4 standard formats for you to base your new annexe on, all of our features are interchangeable and anything can be achieved with our outdoor living spaces.

50 year rubber roof life expectancy
15 year structural guarantee
04 fully customisable design styles
planning permission required


15sqm – 20.5sqm

Looking for a custom space for an extra bedroom? The Sanctuary garden annexe is our more compact annexe, perfect for smaller spaces but it still packs a punch! The Sanctuary comes with, as standard, an open plan bedroom/living space and bathroom spaces.

Find out more
Sanctuary Sketch


21sqm – 30.5sqm

Relax and be at one with Meditate, our annexe that creates a living space for one. Our medium sized annexe, the Meditate garden annexe provides the perfect living space complete with a master bedroom, kitchenette, bathroom and living room spaces.

Find out more
Meditate Sketch


31sqm – 40.5sqm

Two rooms are better than one! If you’re looking for a larger living area, the Laze is the ideal annexe for those looking for a living space to accommodate more than one person. The Laze garden annexe includes master bedroom, second bedroom, kitchenette, bathroom and living room spaces.

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Laze Sketch


41sqm – 50sqm

Looking for maximum space? Xenia is our largest garden annexe and provides the ultimate living annexe. As standard, the Xenia comes built with a master bedroom, second bedroom, kitchen, bathroom, ensuite and living room spaces.

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Xenia Sketch

Our styles explained

Here’s a breakdown of each of our styles so you can see the key differences between them. All our garden annexes are built to a very high quality, and the specifications of each are fully interchangable, meaning you can get creative, designing an annexe that perfectly fits your vision and requirements if there’s something specific you have in mind. Need some help? We can guide you through a design process, using our years of experience and creativity!





Master bed

Bedroom 2





Living Room

Standard features

All our custom garden annexes are constructed with the following features as standard.

  • Structural
    • Full building regulations compliance and sign off
    • 15-year insurance backed structural guarantee
    • Galvanised Groundscrew base
    • Structure built from c24 4×2 structural timbers
    • EPDM Rubber roof with a 50-year life expectancy
  • Design
    • Shower room and toilet (options available)
    • Kitchenette (options available)
    • Room configuration – up to 2 bedrooms
  • Insulation
    • Fully insulated – compliant with building regulations
  • Electrical
    • Full electrics to include 4 double sockets, Internal/external lights and 2-way consumer unit
    • Electric radiators
  • Doors & Windows
    • High Performance UPVC French doors and 3 windows
  • Finishes & Trims
    • Painted and plastered walls, finished in a colour of your choice
    • Tanalised redwood cladding

Customisable features

Our optional extras help bring your project to life and make your garden annexe more 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
    • 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)
  • Finishes & Trims
    • Thermowood
    • Larch cladding
    • Cedar cladding
    • Composite cladding in a choice of colours
  • Flooring & Decking
    • Vinyl-click
    • Engineered wood floor
    • Anthracite composite decking

Only need a Garden Room?

If a live-in garden annexe isn’t quite what you’re looking for but you still need an additional space, then a custom garden room is the perfect solution for you. Whether you’re using it for yoga, as an at home gym, a music studio or even for your at-home business; all of our custom garden rooms are tailored to suit you.

"The best decision I made was letting Custom Garden Rooms design and build my office. From planning, right through the design and build stage these guys where top notch."

Luke Smith - Tetra, Shrewsbury