Kevin McCloud
Brand Ambassador for Green Retreats

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Insulated Garden Rooms

Year-Round Insulated Garden Rooms


Insulated garden rooms are a great way to create extra space at home to use all-year-round. A premium insulated garden building means you can use your building in the coldest winter months, as well as keeping your building cool in summer too.

garden room in large modern garden


What is an insulated garden room?

A garden room is a building that’s separate to your home that serves as an extra space to use however you need it! Premium insulated garden buildings are designed and engineered to be comfortable to use all-year-round. Building methods and materials are like those used in modern home building, meaning an insulated garden room will feel just like a room inside your house, but simply detached for total distinction and privacy.

At Green Retreats we have been pioneers in the design and manufacture of the highest quality insulated garden rooms since 2005. Our experience has allowed us to perfect our designs for optimal performance, being water-tight, dry and comfortable in any season. By being designed to use all-year-round means a quality investment to your home and life – letting you make the most of your garden even in the coldest and wettest wintery months. 


– Insulated garden offices.

One of the most popular uses for our buildings is the use of a garden office. Working from home has soared in popularity over the years, and even more so with the ‘work from home’ recommendations during the Covid-19 pandemic. 

Having a dedicated space to work from home in is incredibly valuable to your focus and concentration. Working from the dining room table just doesn’t say ‘professional’ like a dedicated home office does.

stand out garden rooms

Being completely separate from the house, our insulated garden offices make for the perfect space to focus away from the distractions of home. By leaving the office behind you at the end of the day, you can really be at home in the evening and create the perfect work-life balance. 

What’s more, our insulated garden offices are manufactured to be used all-year-round meaning you can be working and earning from home all-year-round. 



Why choose a Green Retreats insulated garden building?



Insulated garden rooms are a highly cost-effective way to add extra useable space at home. Traditional home extension methods such as loft conversions, garage conversions and conservatories are much more expensive with labour costs, planning permission and building control. 



Green Retreats garden buildings take only 2-5 days to install, meaning minimal interruption to your home life. 

Planning permission is rarely required with the design of our buildings falling within your permitted development rights. Find out more about planning permission and permitted development by visiting the Planning Portal website…

We try to take care of everything with no hidden costs, making the experience an enjoyable one. Base/foundations, installation and internal electrics are all taken care of by us. All we need to quote for separately is for electrical connection from your home to your building as this varies from customer to customer. 


Modern and Stylish

Stylish Home Improvements

An insulated garden building is an exciting way to add space at home that creates a modern and stylish feature in your garden. Choose from one of our 8-10 stunning designs and tailor it to suit your taste. Discover our range of insulated garden room designs here…



With garden buildings being separate to your home and positioned exactly where you want it, there are no demands placed on it – it can become whatever you need it to be! A garden bar, art studio, home office, garden gym – anything at all! Be as noisy as you like or get away from the hustle and bustle of home. 



Climate Aware Certified Company

Our buildings are built with care to the environment. Green Retreats is an eco-friendly company that leaves no negative impact on the environment. When you choose to purchase a Green Retreats garden building, you can be safe in the knowledge that you’re building has been created with complete care to the environment. Find out more here…



Green Retreats have been installing garden buildings since 2005. With over 12,000 installations to our name, we really know our stuff! What’s more, our customers have rated us as 5 Star on the independent review site Trustpilot.


Green Retreats rated 5 Star on Trustpilot


What makes our garden buildings suitable for use all-year-round?

Designed for any season, insulated garden rooms provide benefits in the heat and in the cold.

insulated garden rooms

Insulated Throughout

The walls, roof and floor of our buildings have highly engineered premium grade insulation throughout, helping to keep you warm in winter and cool in summer.


Breathable Design

Our buildings are designed from the start as extra livable leisure spaces for people to enjoy; not at all like a typical outbuilding shed conversion. Our buildings are designed to breathe, allowing vapour to directionally pass through the walls and outside to create a dry and comfortable space. Dampness is not something you need to worry about with our buildings. 


Premium Double Glazing

We use only premium grade double-glazing in our doors and windows for optimal thermal values. Our Pilkington K Optiwhite double-glazing is also argon filled and fitted with a Swisspacer. The doors and windows are also fitted with trickle vents, much like you would have in any modern built home. 


Epoxy Resin Roof

Our roofs are strong and durable. Steel panels sandwich our high-density polyurethane insulation and are topped with an epoxy resin. The whole building is watertight with a slight 4degree slope on the roof to a guttering system on the back. The roof of our buildings does not pool or hold water, with no felt in sight. 



Every building comes with a free-standing radiator already included in the price, with a range of upgrade options available too (including wall-mounted radiators, underfloor heating and air-conditioning).


Opening Windows and Large Doors

An opening lozenge window and 2.3m French or sliding doors are already included in the price of your building. We also offer a range of alternative optional upgrades with anything from large bi-fold doors to single fully clad options. All doors and windows are double-glazed for temperature control and can be opened wide in summer for fresh air.

bi-fold door garden rooms


Air-conditioning available

In the hottest days in summer and the coldest days in winter, even a room in your home needs a bit of extra support to keep you comfortable. Included in the price of every garden building is a free-standing oil-filled radiator, so that’s one thing taken care of already. But if you are looking for complete climate control in the summer that benefits you in the winter too, we offer a range of air-conditioning units to suit your needs. We have underfloor heating and wall-mounted radiator options available too. 


Technical information:

We use industry-leading suppliers for our insulation materials and double-glazing to ensure your garden building has excellent thermal retention. The floor and roof panels are packed full with the highest quality high-density polyurethane insulation. The walls are a highly engineered combination of internal melamine, a dense section of Rockwool, a breathable layer of Photonwrap and your choice of outer cladding. The doors and windows are fitted with Pilkington K™ Optiwhite double glazing, which you’ll find on almost all new build properties in the market today.

Insulation is measured in U-Values (the lower the better) and Green Retreats offer the very best in its class:

  • Glazing: U-Value 1.2
  • Walls: U-Value 0.31
  • Roof: U-Value 0.35
  • Floor: U-Value 0.23

Our buildings are cleverly engineered to breathe. This makes the space a comfortable one to use whether it is a high-intensity garden gym or a relaxing office. Risk of damp is eliminated from either the inside or outside – allowing vapour to pass through the walls and through trickle vents in the windows and doors too. 

Find out more by visiting our construction page…




Starting from £15,495 all-inclusive.


Green Retreats have a Transparent pricing policy. We publish our prices on our website and in our brochure, so you can easily start to plan your project. We include all of the ‘essentials’ in our prices too, so the price you see can be all you pay for your building. Read more about garden room costs here…

Our Sales & Design team are on hand to help draw up a more detailed quote which would include any optional upgrades and possible delivery charges. 

Other costs to keep in mind for your budget:

  • Delivery is included within 100 miles of our factory in Buckinghamshire. We deliver and install to most areas of the mainland UK, so please get in touch if you need a quote for your area.
  • The electrical connection of your garden building to your home power source varies depending on the distance between the two, and the power demands needed from your new garden building. We can quote for this during your free site survey. 




We offer over 70 size configurations in each of our 8 garden room designs. The sizes range of sizes from 4sqm to 30sqm, all in half metre increments. Our buildings are measured on their internal floor area, helping you figure out how much extra useable space you are adding to your home and garden. 

We have everything from tiny garden pods

tiny garden room ideas

… to large garden buildings.

large garden room ideas

Find out more

Take a look through our FAQs, our construction pages or speak to a member of the team today!

For more inspiration, take a look at our videos!

Our garden rooms are priced based on the internal sizes rather than the exterior footprint, making it easier for you to plan your space. The price includes base, installation and VAT so there are no (nasty) surprises when it comes to final payment!


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