Sorry. I replied to this email previously, by email, by mistake, rather than coming here!
The builder is working for the client / homeowner. There is no contract between me and the builder all we have done is shake hands on the agreement to pay ‘half and half, for the steel beam. The builder is saying that if I don’t pay for ALL of the engineer’s fees (£300) he will sue me for his half of the above deal (£800).
Sorry. I know it’s complicated!