Outbuildings are a popular home addition that is becoming increasingly common within residential properties. If you’re looking at ways to extend your home, an outbuilding could be an ideal solution. Providing such a vast amount of additional space, you can use our products for a range of different purposes. Whether you need new office space, a dance studio or even extra living space – we can help.

Our garden room buildings cater to such a broad audience due to their versatility, and they can be customised and tailored for any purpose. We can even install partition walls to break your room up for different purposes, consider options like a home gym with a shower room.

As a lone-standing product, outbuildings are ideal for anyone looking to not only increase space available at home but also to add privacy. Located in your garden, outbuildings provide the luxury of having your personal space where you can retreat whenever needed. We offer various building finishes and styles to suit every home type. Whether you’re looking for something modern, or a traditional log cabin-like design, we have something for everyone. With the unpredictable UK weather, it is imperative to customers that their space will last, and is built to withstand the harsh elements. Our materials are all high-quality with immense durability, ensuring quality and longevity of your outbuilding.


Explore our ranges of garden room building designs. At Green Retreats we have a transparent pricing policy where you can see a fully inclusive price for every building design, size and option. Click below to shop.

Starting From: £11,732

Benefits of a Outbuilding


Our fully insulated buildings mean that they can be used year-round, keeping you cool during those summer months and toasty during the winter.


Due to the construction and design of our buildings, they can be used for a multitude of purposes, giving you the choice of how you use it.


With family homes growing ever smaller, a separate outbuilding in the garden frees up more valuable space in the house without taking space away through extending.


Create a separate area in the outbuilding and teach kids responsibility with a space that feels like their own. Turn it into an adults-only space once they’ve gone to bed.

Overall what makes our products stand out amongst the rest is the simplicity of our customisation and uniqueness. No building is the same, and with our buildings, you can customise the design and make your building feel like your own. As opposed to structures that arrive flat-packed or one building model, we offer the option of design customisation, and our professional installer team installs every single building.

Feedback from our clients often states that our construction is one of the least intrusive forms of a home expansion. The disruption to daily life tends to be minimal as all of the installation takes place in the garden, especially if you have easy garden access. With a very swift installation window, your space will be ready to go within no time, and you will be left with your permanent retreat.

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Design Your Building

Start creating your ideal garden room today using our online design tool. Discover and explore the range of styles, sizes, finishes we have available; plus get an accurate cost as you design.

See your garden building ideas come to life on screen, then save your design to come back and view or edit again at any time.

Also compatible with mobile and tablet devices

Go to Design Tool

Visit Our Showroom

We now have 2 showrooms! Our Westcott showroom is the largest of its kind, showcasing 17 buildings models, all varying in use and purpose. This includes Green Retreats, The Garden Office and The Annex Range. Our new Twickenham showroom showcases our 3 most popular building models and acts as a ‘hub’ closer to our London based customers.

Open 7 days a week, you can drop in whenever you please – with no appointments needed!

Our Showrooms

Finance Options

Providing flexible finance options on all of our building ranges, you can pay off your building spread over 3 -10 years with a monthly instalment plan.

Payment Process

  • £300 deposit
  • 60% at 6 weeks
  • 30% on the final day of initial construction
  • 10% on project completion

    Including electrics, plastering and other optional extras


With so many different ways to extend your home, why should you choose a wooden outbuilding? We believe in total transparency with our customers, especially with pricing. All of our buildings are priced using the internal footprint. We have price grids on our website for customers to look through to show starting costs for our varying building sizes.

We also include everything needed to get your space up and running as soon as it is complete. This includes heating, insulation, lighting, doors, windows and much much more. Not only this, but base installation and VAT will also be included in your building quote.

Each of our 4 outbuilding designs are available in over 70 size configurations in half metre increments, meaning we have something for everyone!Small studio spaces, or large open offices – we have it all! All of our buildings sizes are based on internal floor measurements to clarify the usable space being purchased.

We aim to provide a seamless process from start to finish. Our buildings are constructed from sustainable or locally sourced materials at our factory. Every building we install is carefully insulated for use all year-round.

If you have any questions at any point during your process with Green Retreats, our friendly team are always on hand to help!

Our Transparent Pricing

We include everything needed to get your building up and running within your quoted price – including base installation and VAT. As well as this you will receive a french sliding door set, flooring, plug sockets and much more to get you started as soon as construction finished.

Built to last, our buildings are suited for all year round. Meaning you can exercise at the comfort of your home whether it be rain or shine – no need for trips to the gym in the rain! Completely sealed and insulated just like a room in your home, our products can be used during the freezing winter months, and during the pouring rain.

Green Retreats Annex with a side storage door on the right hand side


Yes, they are warm enough to use throughout the year as they are all well insulated and come with a wall-mounted radiator as standard.

Yes, you can. We will liaise with a plumber to ensure that any necessary openings are in place, ready for the plumber to connect the required services.

Our garden rooms are not designed to be lived in as they do not comply to building regulations. If you would like to live in a garden room, The Annex is part of The Green Retreats Group and offers garden annexes with full planning permission, which comply to building regulations.

Our garden room structures will need to remain free-standing due to the nature of their construction. However, we can build as close as 400mm to any solid obstacle, such as your house.

We do not offer bespoke building options. However, we do offer many different sizes and styles to suit your tastes and budget. You can start to design your building using our visualiser.

We don’t offer a completely soundproof solution for your garden room. We do, however, offer an acoustic pack which reduces the transfer of sound to approximately -45db – however, this is not ‘soundproof’. Although we use industry-leading acoustically laminated glass, this is the least effective component of our acoustic pack. Please bear in mind that the more glass you opt for in your garden room, the lesser the effect the acoustic pack will have.

Planning permission is not normally required as our buildings fall under permitted development (built under 2.5m high externally). Most houses, even in conservation areas and areas of outstanding natural beauty (AONB), have permitted development rights. Flats and listed buildings have no permitted development rights, so will always need planning permission. Don’t worry though, as planning is a relatively simple process for our garden rooms and we are on-hand to help with this process.

We offer a complete electrical connection from your house to the garden room at an additional cost, which will be confirmed at your design consultation. However, you are more than welcome to use your own preferred electrician for this.

Yes, all of our buildings come as standard with a free-standing oil-filled radiator. We also offer a variety of heating options including wall-mounted radiators, underfloor heating and air conditioning.

We use the industry’s leading providers for our insulation and double-glazing for excellent thermal retention. The floor and roof panels are filled with market-leading high-density polyurethane insulation and are double backed for optimum performance. Our highly efficient walls are filled with A* fire-rated natural Rockwool insulation and engineered with a layer of PhotonWrap multi-foil, an air-open reflective insulating breather membrane. All windows and doors are fitted with Pilkington K™ Optiwhite double glazing. Our double glazing is 28mm thick as standard and 28.6mm for our acoustic pack.

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Building Measurements

You can get a great idea of how your new garden office will look by using the 360 degree rotating viewer.

Also compatible with mobile and tablet devices


Design Your Building

Start designing your garden room today using our online Visualiser tool. You’ll be able to choose your style, size, finishes and get an accurate cost.

Design Your Building