What to ask builder? Quote for extension.

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Have had plans drawn up for a ground floor extension at the back, with patio doors etc etc.

Builders will shortly be coming round to discuss project and then give us quotes.

I have never done anything like this before. Does anyone who has, have any advice of what I should be asking the builders at this stage?

e.g. whether the cost includes the paving outside the patio doors etc

I don't want to take anything for granted....to be told "that's extra" halfway through the build!

Many thanks

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Thanks all for your great advice!

Will definitely ask for references.
Will definitely go through everything from standard of inside doors, skirting, patio door type, to the immediate outside....even down to the drainage.

Yeah Dave, we were thinking about starting soon....but isn't the idea to build the 'box' at the back before knocking through the exisiting wall??

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Thanks to those who have added advice since my last post. Very good points!

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Busa mav said:

I see most builders being happy to provide the requested information, it isnt a lot really , just cuts to the chase.

This is the detail of what I want doing , these are the rules ,
How much
How long
When do you want paying ?


When they get given a set of my drawings to price, they know they are going to get a similar tender invite letter and a list of requirements from the client.

If you don't provide all the details of what you want you will just get a line of provisional sums which is next to useless .

What sort of rules should I be thinking of?

Other than the detail of what I want doing...and an agreement on reasonable time to get it done.....what else is left to put in this 'Rules' section?

Once again, genuine Q, as its in my interests to understand!