Not all builders will carry out every task and its common for builders to use subcontractors for some work such as electrics and plumbing. If your builder uses subcontractors or you feel you need to know if they are certified for the task then ask to see proof, "like gas safe id card for plumbers or ECS or NICEIC cards for electricians."

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Some builders will fully manage there project from beginning to end, including working with the architect, building inspectors and order all of the materials. be very clear at the start with your builder who is project manager for the job. if your builder is not project managing, chat about how he like things to work and who will be responsible for each part of the process.

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If your builder isn't project managing, be very clear who is ordering the materials and when they should be on site. also ask if they will give you there trade discount if you are ordering the materials. your builder should be able to give you a program of works, even if its a basic outline of what will happen.

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builders must be able to manage there work load while making sure they are constantly busy and are able to sustain there business. its important that your builder can give the attention to your project and they don't spread themselves to thin.

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Ask your builder how long they guarantee their work and what the guarantee covers. Any good builder will want to ensure they have fixed any issues before the end of the guarantee.