We've had builders in for a week doing renovations in various rooms. Before the builders started we signed a contract which had itemised costs in it but they missed off a couple of small things that we asked for as part of the work.
We separately agreed the additional work that was required (rewiring some sockets) but were not given a separate price for it. As it was only a minor part of the total works I didn't think anything of it, until it came to paying when they suddenly claimed I had to pay an extra £370 for the additional work.
They asked for payment in cash so obviously I didn't have the extra on me at the time and they've been calling me repeatedly chasing for payment since then. Nothing was said about extra costs until after the work was done. I'm wondering how enforceable the extra payment is and what to do?