Thanks for the replies. Apologies if my wording is ambiguous, it is all very new to me.
The house is still being built by the builder/contractor. When we went to view the house it had already been built but was (and is still) a building site, building up, roof done, windows etc but no plastering or wiring.
We were given the plans for the house and we are paying for the fit out with the exception of appliances. House is expected to be completed by builder in November to be handed over the second week in Dec (I need to confirm). We are getting contract signed tomorrow which was why I posted looking for any words of wisdom. I think we left it too late as any changes will need to be included in the contract. I will ask the solicitor if it is possible to include it. Hope this makes more sense.
This is a completely different scenario than what you outlined in your original question. Amazing how some people today will use their so called "novice" position to garner a response and, then give an exact explanation in relation to their position.
In any case, have a very good chat with the builder in relation to what it is you actually want, listen to what he says, what the extra charges might be and if they will cause any problems in relation to the planning permission that was given. Do not forget the Cert of Compliance from engineer.