Even if you haven’t yet signed the contract, starting work on-site, doing design work or even ordering materials could be construed as acceptance by conduct. Alternatively, the contract will have been agreed and signed. In either case, any of these actions ‘starts the clock ticking’ and the agreed period begins to elapse. At the end of that period, if your works are incomplete, and in the absence of a formal extension of time, you are in breach of contract and the Contractor’s or Client’s remedy for that breach is damages.