Kevin McCloud
Brand Ambassador for Green Retreats

Find Out More

How well insulated is a garden room from Green Retreats?

12th December 2018

What are our garden room insulation values?

garden room insulated infographicWhen researching your new garden room project, one of the main areas of concern for customers is how warm the building will during the coldest winter months. Our garden rooms are a world away from damp sheds and log cabins, and we work hard to ensure that our garden room insulation values (also referred to as u-values) are engineered to the highest standard. This is to ensure that you can use your space all year round; as a garden gym, office or relaxation space – really, for almost anything you like!

Truth be told, a garden room from Green Retreats is a lot more like a room inside your house and our construction techniques mirror those of Scandinavian house builders, a tried and tested methods in climates far harsher than ours.

Floor & Roof

We use structurally insulated 60mm roof panels and 80mm floor panels, engineered by Kingspan, the leading provider of insulation in Europe. These steel backed 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.


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.





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 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 our garden rooms, offices and studios.


An oil filled radiator is supplied to you as standard, which due to our superior wall cavity insulation is more than sufficient to heat your garden room in the winter. Effective engineering of our materials means that our buildings are efficient without having to meet costly building regulation standards.

The u-values of our garden rooms can be found below and 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

If you would like to talk to us about your garden room project, why not book a free site survey & design consultation with one of our friendly and knowledgeable on-site consultants?

Design Consultation

  • Select your preference of which type of consultation you would prefer to start with, using the tick boxes below, and we will be in touch to arrange a suitable date and time:
  • Manually Enter Address

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 work space. A commercial unit from Green Retreats could end up saving you a fortune from the costs of renting a workspace alone. The price includes base, installation and VAT so there are no (nasty) surprises when it comes to final payment.

You are on your way to our


Using our configurator you can design your perfect garden office with minimal effort, ensuring it’s tailored to your own personal preferences and specifications.

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

Go To Configurator Cancel