we have employed a building company, contracts signed, to build a single story extension and fully renovate our flat. The extension is water tight, nearly close to finishing, we are 6 months in (3 month estimated build time). We paid staged payments and full filled our part of the contract, they are now demanding an extra £30 000 or they can not finish the build. The contract allows us to retain the outstanding bill, what should I do. There has been little or no work for 2 months, as the company appear to have used our payments on another project and the men working have not been paid, one threatened me and the police had to be involved - as the company told the men I had refused to pay - having just handed over the third payment I was somewhat non plus. The company came with glowing reviews and is well known local builder. What should I do? As I do not trust them to finish the job if I pay the £30 000 and thats it paid in full.