Radbourne Haven Plus Garden Room

£3,900.00£5,550.00 Inc. VAT

Images are for illustration purposes only.

Radbourne Haven Plus Garden Room

£3,900.00£5,550.00 Inc. VAT

The Radbourne Haven Plus garden room is a truly fantastic way to build a garden room. By the very design of the building, you don’t need to be highly skilled in DIY as t comes as the shell of the building comes as a flat pack kit. The kit contains all your instructions and he panels have been cut to size and numbered. The panels simply screw together having been produced from fully insulated SIP panels.  Walls and floor are 97mm thick and 122mm thick roof to keep the heat in during winter and out during summer.  These are one of the most energy efficient buildings on the market and are available in a range of sizes. You really do have so much choice with a Radbourne because we believe that it is best for you can choose you external cladding option and  and your full interior finish to get your very own desired finish.

If the size you want isn’t available as a standard or you require extra windows or door cut outs, please contact us for a quote.

The kits consist of all SIPS panels already cut to size, fixings pack, waterproof membrane, cladding battens, and EPDM roof.  As well as installation instructions.


Width – 3.6m (Across the front)

Depth available (Front to back)

  • 2.4m
  • 3.0m
  • 3.6m

Maximum height – 2.5m so don’t need planning permission.

Canopy to the front elevation 60cm overhang

Opening at the front to accommodate a 3000mm (W) x 2040mm (H) door of your choice.


Product Specification

Radbourne Haven Plus garden room Spec:

3.6m Length (Across the front) Maximum height – 2.5m available in 3 depth options, 2.4m, 3m or 3.6m

Opening at the front to accommodate a 3000mm (W) x 2040mm (H) door of your choice. Purchase a door from our range

Flat pack, self-assembly kit. 97mm SIP panels to the walls and floor and 122mm SIP panel for the roof.  

EPDM rubber roofing kit with a life expectancy of up to 50 years.  

Pre wrapped in breathable membrane and battened. 

Panels, splines and timbers, cut and ready to construct. 

Opening cut outs are timber lined, ready to install your doors and windows. 

All fixings are supplied to complete the kit.

The SIPs kit is supplied with clear installation instructions.

Estimated self-build time – 1-2 days* for 2 people.  

*This is dependent on skill level, weather conditions and chosen building size. The choice of foundations may also impact this timeframe estimation because they need to be in place before construction. 

Radbourne Haven Plus has a 10 Years Manufacturers Guarantee if fitted adequately with waterproof cladding. 

The building will need a sound, level foundation to sit on. We recommend either a level concrete slab, the same footprint as the studio, 50mm below and 50mm above ground, or flat headed ground screws. 

Do you want maintenance free? To finish your garden room why not clad your building with one of our composite cladding options, available in a choice of colours and texture. Composite cladding requires very minimal maintenance with no requirement for treatment or painting, leaving your building looking beautiful for years. /products/composite-cladding/

Our panels are for stand-alone garden rooms that fall under permitted development.  They are not suitable for home extensions, houses or living dwellings. 

Additional Information

Do I need planning permission? Click here

For further reading on planning permission View ‘Permitted development for householders – Technical guidance’ on Gov.uk

Here’s more about Structural Insulated Panels (SIPs), see our SIPs page

Additional Information About This Product

Building Size

3.6m x 2.4m, 3.6m x 3.6m, 3.6m x 3m