luscious green roof on a garden shed

DIY Green Roof Guide

The online resource for building small scale green roofs on garden sheds, garages, house extensions and other small construction or retrofitting projects

a green roof on a new house extension

New Builds

A step by step guide to creating a SAFE and LEAK FREE green roof on a new small scale construction project. Learn from the vastly experienced authors how to accomplish it yourself or provide guidance to your contractors

a small green roof on an electrical substation


Even the smallest of roof spaces can provide a small haven of beauty and a wildlife oasis. The retrofitting section advice can be used on garden sheds, cycle & bin shelters, the fundamentals remain the same!

edge details of a garden shed green roof


From suggested screw sizes through edge details to drainage suggestions, John & Dusty take you through the process using text, photos, illustrations and videos

edge details of a garden shed green roof

Planting Ideas

Plant suggestions focussed on native species that can provide the maximum biodiversity. Separate lists for the UK, Eastern USA & Canada, Mid-West USA

The Roof Must Not Collapse

What loads are possible without the roof collapsing?

We tend to work on standard weights for various items in the green roof build-up. These are all saturated loads expressed in kg/m2. It should be noted that if you were retrofitting onto an existing building, you would have to ask a qualified engineer to provide you with the additional load that can be applied to the existing structure. Then you can work out what is possible.

  • Approximate saturated weights are provided for various green roof approaches.
  • How you can calculate the potential size of timber you will need, however we clearly recommend you take professional advice to ensure that your structure can take the weight intended.
  • What waterproofing layer can be used and how best to this can be installed without needing a professional roof contractor.
Get Started Now or Find Out More!

Get immediate access to the all the information you will need to design and build your own small scale green roof.​ Or get a better idea of the site contents first on the overview page, check out worldwide examples of small green roof builds and plantings

or if you're ready, take advantage of the Summer 2023 price reduction...