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Residential Specification Materials

All of our insulated garden rooms feature the same class-leading levels of thermal performance and structural strength. We achieve this through the use of modern residential specification materials, the sames as used in many newly built homes. This ensures a solid feel to your new garden room space and longevity for your investment.

A bit about the construction materials we use

Behind every bespoke garden room sits a foundation system, structural and insulative shell, EPDM roofing system and exterior breather membrane.  You will be pleased to know that when specifying these critical areas, we choose the right materials for the right areas, providing strength, warmth and longevity to your new garden room.


Foundation System:

We have four foundation systems available to manage the different ground conditions that you may have.  We can construct onto an existing level concrete base, uneven concrete surfaces and also onto lawn or soil areas using in most cases, our precast concrete plinth foundation system, or in some cases our concrete & steel pile system.  The foundation system is chosen to meet your individual ground conditions and specified to manage the building loads.


Floor Structure: 

All garden rooms utilise a treated timber, residential specification subfloor, with the same strength and feel you would expect from a newly built home.  In most cases the floor structure will feature a best practice, underfloor ventilation gap and site-wide weed control fabric, preventing any future vegetation growth.  The floor structure features 100 mm of polyurethane insulation with an overall U-value of 0.19 W/m^2K, against the Part L build regulations requirement of 0.25 W/m^2K (Lower U values are better and more insulative).


SIP Walls:

The walls are constructed from 120 mm Structural Insulated Panels (SIPs) known for their strength and thermal performance, they feature 100 mm of polyurethane insulation with an overall U-value of 0.18 W/m^2K, against the Part L build regulations requirement of 0.30 W/m^2K.  The exterior of the walls are wrapped in a breathable and waterproof membrane, this allows any moisture to escape from the building but not to penetrate.  The exterior is finished with your choice of high-quality cladding to provide the primary weather protection, with a best practice ventilation cavity behind.


Windows & Doors:

All of our windows and doors are A rated, argon filled, double glazed units and meet the current Part L building regulations requirements for thermal performance of glazing.  All locking systems exceed the existing "secured by design" standards recommended by the UK police force.



The interior is finished with traditional plasterboard, skim and optional paint finish, lighting, recessed sockets and switches, with a choice of flooring types and skirting board.  All of our garden rooms feature a heater to suit the size of the structure.


Roof Structure:

The roof is an insulated and ventilated design finished with an EPDM roofing system, carrying a 20-year manufacturer’s guarantee as we are approved installers of this system.  The roof is insulated with 120 mm of polyurethane insulation and is mono-pitched, meaning the roof has a front to rear fall for rainwater drainage.  We follow the same designs standard for residential homes when specifying your roof structure for strength and best practice ventilation to handle any internal condensation.  The roof has an overall U-value of 0.17 W/m^2K against the Part L building regulations requirement of 0.20 W/m^2K.

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Insulation Performance

One of the most important features of a garden room and critical to ensuring comfortable use of your new space, 365 days a year. Read about why we use polyurethane insulation and SIPs.

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Structural Design Checklist

Using best practice design standards and calculations, we ensure your new garden room stands the test of time.