Miranda Krestovnikoff looks at new building materials for environmentally-friendly houses and asks where you should start if you want to build your own eco-home.

Costing The Earth visits Ashley Vale in Bristol: a self-built community of eco-homes to find out, ten years on, if the project has been a success.

Miranda also discovers the latest building materials and techniques available to those embarking on 'grand design' style projects and discovers how difficult and expensive it is to build your own environment-sensitive home.

Presenter: Miranda Krestovnikoff
Producer: Martin Poyntz-Roberts.