Hi, I have just built a double bin made from wood which I have calculated will hold 1600 ltrs, that's like 7 normal household black compost bins and it wasn't dear. It cost me £52 for the wood and £4.30 for some easy drive outdoor screws....click on this link to see a piccy....My Garden Blog
I built this for a client so I added labour, the wood I got was from a saw mill, I just gave them a list of the lengths I needed, to be honest, it's cheaper just to get the lengths they already do, their standard lengths so there's no extra costs.
For this double 1600 ltr bin I ordered the following
- 12 boards @ 1.8m long x 150mm width x 19mm depth
- 3 posts @ 1.2 m long x 100mm x 100mm
- 6 battons @ 1.2 m long x 100mm x 44mm
All this cost me £42 delivery was £10, screws were £4.30 for 100, easy drive.
This bin has a slotted front to get the compost in and out a bit better, I only really did that for the client as she's not as tall as me, I would just shovel the stuff out.
I was pushed to make myself after seeing the prices some folk were asking, a bin half that size was costing a lot more.
Hope this helps.