Handle9:Geektastic: Having worked in the property industry for a long time before moving here, I was amazed (and still am) at the seeming lack of professional independent supervision provided by the RICS members in the UK, as well as the seeming lack of genuine fixed price contracts.
If you have a fixed price, the contractor agrees to complete the specified work to the appropriate standard and for the exact price in the contract. If he finds it costs him 50% more because he costed it wrong, I’d expect him to foot that extra.
Here, they seem to simply expect the client to write another cheque.There is no such thing as a fixed price contract just as there is no such thing as a complete specification.
You can expect what you like, if you don't provide a complete specification and choose a contractor based on lowest conforming tender it's your bad luck.
Edit: I should probably add that it is quite literally imposible to provide a complete specification, I've never seen one anywhere in the world on a decently sized job. They are always a basis for design and pricing, not what gets built.
Whilst there are certainly possible variations to a contract for changes made after commencement, it’s certainly possible to write a complete specification and to have fixed price contracts for the work.
I’ve built everything from livestock housing to roads using them and seen contractors take losses running to hundreds of thousands of dollars for making errors or incorrectly costing the work.
If the Chartered Surveyor or Architect who wrote the specification made errors, then the resulting costs are down to them or their Professional Indemnity insurance.