Material & costs

I came in a little over my £250-300 budget. Most of the cost involved was in the materials for the wood bunker or base. Here's a rough breakdown:

• Tonne bag of Sharp Sand
  40 breeze blocks (used about 24, I think)
  4 bags of cement
  2 1800mm concrete lintels
  Total £180 from Wickes
  
• 24x 25mm deep Fire bricks
  Total £50 online
• Cobble stones for decorating top of bunker
  Total £60 from B&Q
• Most of the footing bricks I had already, so these cost nothing.
  
• Various tools and extra materials
  Total £50
• MOST IMPORTANTLY: The Clay was FREE - dug up from my garden !!