Insulated Garden Rooms
Year-Round Garden Rooms, for Every Season
Insulated garden rooms offer perfect year-round outdoor use, utilising premium-grade materials that provide excellent thermal control. Our insulated garden room walls, flooring and roofing are comprised of leading insulation elements designed to keep you cool in the summer and toasty in winter.
About Our Garden Room Insulation
Walls
Our walls are designed to be both thermally and space efficient to ensures the best u-values and maximum internal space. Our wall thickness is 100mm, which includes 45mm of Rockwool insulation and a scientifically developed thermal vapour barrier called Photonwrap. This allows moisture to escape and it also reflects heat back into your garden room in the winter months.
See how our insulated garden rooms are made by reading our manufacturing process.
Floor & Roofing
We use structurally insulated 60mm roof panels and 80mm floor panels in our garden buildings. These panels provide decades of life expectancy, outlasting EPDM rubber and felt roofs that are often used by our competitors. Our floor and roof panels also add to our unrivalled levels of insulation for a garden room, which slot and bolt together quickly, meaning we are on-site for less time, and you can start moving into your new space.
Glazing
Double glazing like you’d find in a residential house in our doors and windows complete the puzzle. We have partnered with Clear Edge uPVC, who are based on the same business park as our Buckinghamshire showroom and factory. Clear Edge and Green Retreats have worked tirelessly to manufacture doors and windows using state-of-the-art machinery and uPVC materials. This partnership allows us to create market-leading double glazing units for insulated garden rooms.
Heating
A wall-mounted radiator (is supplied to you as standard, already included in the price of every building. Due to our superior wall cavity insulation, this oil-filled radiator is more than sufficient to heat our insulated garden rooms in the winter. Effective engineering of our materials means that our buildings are efficient without having to meet costly building regulation standards. We also offer optional upgrades of underfloor heating and even air-conditioning for complete temperature control.
Our Garden Room U-Values
The u-values of our garden rooms can be found below. Our manufacturing page contains even more information about our construction methods:
- Glazing: U-Value 1.2
- Walls: U-Value 0.31
- Roof: U-Value 0.35
- Floor: U-Value 0.23
Insulated Garden Room Designs
Every building from Green Retreats comes fully insulated as standard, with heating included too!
We use premium materials in the roof, walls, floors, and double-glazing, ensuring every Green Retreats building is crafted for year-round comfort.
Basebox
Our most cost-effective garden room building yet. Designed with form and function in mind. Self Build or Fully Installed Value-Engineered Garden Pods.
From: £9,995
G Range
G1
Traditional cabin style in a modern design with a grand hood that extends from all sides.
From: £23,790G2
Compact and contemporary with squared edges and a shallow front frame that gives a pod-style appearance.
From: £23,790G3
Stylish square-edge design with an extended front frame that creates a striking sheltered surround.
From: £23,790G4
Sharp and architectural with a forward-leaning front frame that creates a dynamic statement design.
From: £24,955G5
Curved corner detail that joins a sheltered hood and enclosed side to create a distinctively different design.
From: £24,955Other Buildings By Green Retreats
X1 by Green Retreats
Luxury driven design
Elevate your outdoor living experience with the epitome of luxury.
The X1 garden room by Green Retreats has been infused with luxury from inception and embedded in every detail.
Housing by Green Retreats
A complete living solution for your home
The perfect living space in your garden
The Annex Range from Green Retreats is our collection of tiny homes. Designed for full-time living; including building regulations approval, kitchen and bathroom.
Launch Offer | £3,000 Voucher Towards Your Garden Room*
The A Range is here! Enjoy limited-time discounts across our garden room collection. Upgrade your outdoor space today!
What are insulated Garden Rooms?
All garden rooms from Green Retreats come fully insulated and double-glazed as standard, including heating for added comfort.
Built with high-quality insulation in the walls, roof, and floor—similar to what’s used in new-build homes—our rooms stay warm in winter and cool in summer. Energy efficiency is taken care of, leaving you to enjoy your extra space all year round.
Top 3 Insulated Garden Room Uses
1. Garden Offices
Insulated garden offices create a productive work environment to focus, free from household distractions. With excellent insulation, you’ll stay comfortable year-round. Personalise your space to perfectly suit your work-from-home or small business needs.
2. Home Gym in the Garden
Reach your fitness goals in a peaceful, private and personalised space. Our insulated garden rooms provide ample light, ventilation, space and privacy, making them the perfect space to create a gym at home.
3. Garden Guest Room
Perfect for overnight guests, a fully insulated garden room is a comfortable, private accommodation option. Heating, lighting and premium insulation are all included as standard, so all you need to do is add furniture to create a welcoming space for family and friends.
Why is Green Retreats the UK’s favourite Garden Room Company:
Eco-Friendly & Sustainable
Green Retreats is the eco-friendly choice! As a carbon-neutral company, we plant five trees for every one used. And for our garden room buildings, the energy-efficient insulation protects the environment while saving you money!
Family-Run Since 2005
Since 2005, we’ve been helping our customers grow their homes with insulated garden rooms. We’re tried and tested and remain the UK’s favourite. And we’re very proud!
12-year guarantee
All of our insulated garden rooms come with a comprehensive 12-year guarantee, giving you that extra peace of mind for a lasting investment to your home.
Engineered For Year-Round Use
Every building from Green Retreats is fully insulated for comfortable use all year round. Cavity insulation, double-glazing, and heating are included as standard.
Designed and built in the UK
Every element of our insulated garden rooms is designed and manufactured in-house at our state-of-the-art manufacturing facilities in the UK.
UK’s Largest Garden Room Showroom
We have two showrooms for customers to experience the quality of our buildings for themselves! Including the UK’s largest garden room showroom in Buckinghamshire near Bicester Village.
Add Value to your Home
Our insulated garden rooms have been proven to add value to your home, as much as 5-15%! Our buildings are a lasting investment to your home and lifestyle.
Backed by TV’s Kevin McCloud
Architecture guru and BAFTA award-winning presenter Kevin McCloud has chosen to work with Green Retreats due to our commitment and shared passion for quality design, innovation and sustainability in the construction industry.
Insulated Garden Room Gallery
Real Customer Projects
Get inspired for your insulated garden room project!
Benefits Of A Insulated Garden Room
WHO WE’VE WORKED WITH
As the UK’s leading garden room company, Green Retreats are proud to have been featured in many national publications.
Our Showrooms
See the quality of our insulated garden rooms for yourself by visiting one of our showrooms! Choose from our flagship showroom in Buckinghamshire with 20 garden rooms to see or our hub showroom in Twickenham with 4 garden rooms on display.
A lookbook of our insulated garden rooms to inspire your project
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!
Insulated Garden Room FAQs
The great news is that planning permission is generally not required for insulated garden rooms! Insulated garden rooms are classed as ‘outbuildings’, which fall within your permitted development rights. Some properties and areas in the UK don’t have permitted development rights, in which case planning permission would be required. We can help with the planning application process on your behalf should you need it, taking care of the hassle for you.
Yes! All of our garden rooms are fully insulated to use all year round. Our premium-grade insulation helps regulate the temperature of your garden room to keep you warm in the winter and cool in the summer.
Absolutely! Independent property experts have calculated that quality insulated garden rooms can add between 5-15% on your property value! In addition, Luke Jackson, a property expert, noted: “With remote working now so common, buyers’ priorities have shifted. An insulated garden room, separate from the main house, can now be the deciding factor in closing a property deal.” Find out more about how garden rooms add value to your home…
The cost of insulated garden rooms will depend on the size, model and additional options and upgrades you choose. Fully insulated buildings start from £9,860 for a self-build garden room or £11,725 for a fully installed building. We’re transparent about our costs, giving customers a complete quote with no hidden extras, completely free of charge with every design. We’ve also listed out all of the costs for your project to help you in your early stages with our article called How Much is a Garden Room.
Our insulated garden rooms are designed to keep your valuable work equipment safe when you’re finished for the day!
The insurance-grade doors and windows keep your garden office secure. The premium double glazing is designed to withstand considerable shock compared to traditional options.
Insulated garden rooms are built using the same high-quality materials you would find in most new-build homes, making them as warm and comfortable as a room in your home. Every building from Green Retreats comes with a wall-mounted radiator included in the price as standard, helping to keep you warm and toasty in the winter months.
Insulated garden rooms are designed for all-season use, providing comfort in any weather. Rain or shine, they offer a cosy, dry space in the winter and a cool, refreshing environment during the summer.
The lower the u-value the better a material is at reducing thermal transfer, so keeping the heat in and the cold out! We have these measurements for our individual materials to give you an idea of just how efficient our buildings are! Each building is custom made to your specification (size, number of windows etc) so the total u-value of each building will differ. However, because we use premium materials to keep our insulated garden rooms warm you won’t need to worry about feeling the outside elements.
Case Studies & Ideas
Looking for some inspiration for your insulated garden room? Take a look at what some of our customers have done with their Green Retreat.