Outbuildings
Designed with premium insulation, electrics and a high quality finish, our outbuildings combine contemporary design with everyday practicality.
Why Choose a Green Retreats Outbuilding?
Our outbuildings are designed to give you the extra space your home needs, without the disruption or expense of a traditional extension. Here’s what you can expect:
- A versatile space tailored to your lifestyle
- A fully bespoke design to suit your home and garden
- Everything you need included as standard
- Expert installation in just a few days
- No hidden costs or unexpected extras
- Designed to enhance your home and add lasting value
- Backed by a 12 year guarantee
Shop Our Outbuilding Range
All of our outbuilding designs are created to provide flexible extra space, with premium insulation, glazing and layouts that can be tailored to suit your lifestyle and enjoyed throughout the year.
Cost-effective
B-Range
From £9,485
Affordable outbuildings without compromising on quality.
As seen on…
FREE Air Conditioning worth £2,290
Beat the heat this summer!
✔ Stay cool and comfortable, even on the hottest summer days
✔ Perfect for garden offices, garden gyms and relaxing spaces
✔ Available on all qualifying September installation dates
✔ Enjoy your garden room in complete comfort all year round
*TERMS AND CONDITIONS APPLY
- Offers cannot be used in conjunction with any other promotion, discount or finance incentive.
- Selected offers are only available on qualifying installations scheduled before the end of September, subject to availability.
- Not valid on orders placed through Costco.
- If your project requires planning permission, promotional eligibility will depend on approval being received in time for an eligible installation date.
- Installation dates are subject to availability and may change depending on project requirements and installation schedules.
- Green Retreats reserves the right to amend, extend or withdraw any promotional offer at any time without notice.
- Please speak with our team for full offer details and eligibility criteria.
What Is An Outbuilding?
An outbuilding is a detached structure located within the grounds of your property, separate from the main house. Modern outbuildings can be used for a wide range of purposes, including home offices, gyms, studios, entertaining spaces and additional living areas. Unlike a traditional extension, an outbuilding provides valuable extra space without altering the footprint of your home.
Green Retreats outbuildings are fully insulated, professionally installed and designed for comfortable year round use.
For a tailored price based on your space and ideas, get a quick quote from Green Retreats and our design advisors will help you create the outbuilding.
What is Included in Every Green Retreats Outbuilding
Choosing an outbuilding from Green Retreats gives you a versatile space to work, relax or entertain, designed for everyday comfort and built to last. Here is what you can expect as standard:
Professional Installation
Our expert installation teams complete most outbuildings in just 2 to 5 days, helping you enjoy your new space sooner with minimal disruption.
Double Glazing
Double glazed doors and windows help keep your outbuilding warm, quiet and secure, creating a comfortable space to enjoy throughout the year.
Premium Insulation
High performance insulation throughout the walls, floor and roof helps maintain a comfortable temperature inside your outbuilding, whatever the season.
12-year guarantee
Our 12 year guarantee provides lasting peace of mind, so you can enjoy your outbuilding with confidence for years to come.
Turnkey Building Package
Heating, lighting, power sockets, flooring and exterior cladding are all included as standard, giving you a fully finished outbuilding that’s ready to enjoy from day one.
How Much Does An Outbuilding cost?
Outbuilding prices in the UK typically start from around £9,485, with most fully insulated, professionally installed outbuildings ranging between £12,000 and £30,000 depending on their size, design and specification.
At Green Retreats, our outbuildings are designed to create high quality extra space for your home, whether you need a home office, gym, studio or somewhere to relax. Each building is fully insulated, built with premium materials and includes everything you need as standard, so there are no hidden costs or unexpected extras.
Green Retreats offers a range of premium outbuildings with clear, fully inclusive pricing. Compare our different ranges to see what’s included as standard and find the design that’s right for you.
Outbuilding Photo Gallery
From inspiring home offices and gyms to creative studios and stylish entertaining spaces, explore how our customers are bringing their ideas to life in our outbuildings photo gallery.
What Size Outbuilding Can I Get Without Planning Permission?
Many outbuildings up to 30m2 can be built under Permitted Development rights, meaning planning permission is not usually required. The maximum size depends on several factors, including the height of the building, its location within your garden and how much land around your home has already been developed.
Every property is different, so it’s always worth checking your specific circumstances using the Planning Portal before starting your project. If planning permission is required, our in house planning team can offer expert advice and guide you through the process. With a 96% planning approval rate, we’re here to help make the journey as straightforward as possible.
Why Choose Us
20 Years of Know-How
Since 2005, we’ve been crafting garden offices with a focus on quality, craftsmanship, and service.
5* Rated by Our Customers
Independently rated 5* on Trustpilot by our customers (over 17,000 of you!)
Family Run
Family values are at the heart of everything we do — that’s why our reputation for quality and care speaks for itself.
Dedicated Customer Advisor
To make your garden office journey smooth and stress-free. Plus, ongoing support from a dedicated aftercare team too!
Do You Pay Council Tax On Outbuildings?
In most cases, outbuildings used as part of your main home, such as a home office, gym, studio or hobby room, do not attract separate council tax. As they remain part of your existing property, they are not usually treated as a separate dwelling.
However, if an outbuilding is converted into self contained living accommodation with its own sleeping facilities, it may be assessed separately.
As every property and project is different, it’s always best to seek advice based on your individual circumstances. If you’re unsure, our experienced in house planning team can offer guidance and help you understand what may apply to your project before you begin.
Our Showrooms
See the quality of our outbuildings for yourself by visiting one of our showrooms! Choose from our flagship showroom in Buckinghamshire with 24 garden rooms to see, or our hub showroom in Twickenham with 4 garden rooms on display.
What our customers say
We are so pleased to be top rated on Trustpilot
by our customers.
by Louisa (Louisa Tudor)
Fantastic Room in a little London garden!
We now have an amazing room at the bottom of our garden that fits in beautifully and feels as though it has been there for ever. All the staff were incredibly helpful and friendly and the entire process was very straightforward.
by E Fisher (Diva Fitness)
Excellent choice of supplier for my Garden Studio! So pleased
Green Retreats deserve every single one of my star ratings! They have been very professional right from the start, from welcoming me to their warehouse to helping me make the right choice through to a fabulous installation. The finished studio is amazing, a top quality build and the installation teams were timely, polite and very hard-working.
Thanks to you all…what a fab company!!
by Alexa Garthwaite
Fantastic product and service to match
We had a 3.5m by 5m garden room installed last month and we are delighted with the result. We are using it as a home gym and love the extra space it has given us! The building also looks fantastic at the bottom of our garden. Green retreats have been an absolute pleasure to deal with. In summary I have been very impressed by both the product and the service provided by green retreats and highly recommend!
Get Your Outbuilding Quick Quote
Request a quick, no-obligation quote in a few simple steps, and our Sales Team will get back to you as soon as possible.
Outbuilding FAQs
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.
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.
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 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.