The real life hobbit house

A cosy, magical-looking cottage built by Simon Dale and his father-in-law in Wales. This delightful eco-friendly family home was constructed just £3000 using low impact materials.  Why can't we make thousands of these homes?
Some key points of the design and construction:

• Dug into hillside for low visual impact and shelter
• Stone and mud from diggings used for retaining walls, foundations etc.
• Frame of oak thinnings (spare wood) from surrounding woodland
• Reciprocal roof rafters are structurally and aesthaetically fantastic and very easy to do
• Straw bales in floor, walls and roof for super-insulation and easy building
• Plastic sheet and mud/turf roof for low impact and ease
• Lime plaster on walls is breathable and low energy to manufacture (compared to cement)
• Reclaimed (scrap) wood for floors and fittings
• Anything you could possibly want is in a rubbish pile somewhere (windows, burner, plumbing, wiring...)
• Woodburner for heating - renewable and locally plentiful
• Flue goes through big stone/plaster lump to retain and slowly release heat
• Fridge is cooled by air coming underground through foundations
• Skylight in roof lets in natural feeling light
• Solar panels for lighting, music and computing
• Water by gravity from nearby spring
• Compost toilet
• Roof water collects in pond for garden etc.