You'll not only endure weeks of builder's bum and builder's tea - a builder can make your project a dream or a nightmare. Find out how to choose wisely

A bad builder in your home can be an extremely stressful experience, but for every rotten apple there are many hard-working and responsible companies. The trick is knowing how to select them. Below is a step-by-step guide to rooting out the cowboys and picking a sure-fire winner.

Establish their credibility
A good building company will be affiliated to a renowned trade organisation like the Federation of Master Builders. Don't just take their word for it, ask for membership details and check with the member organisation. These associations guarantee a certain standard and have done in-depth research with previous customers to ascertain the builder's credentials. They are also an independent body you can appeal to if there are problems during the build and they offer a comprehensive 'Find a Builder' service. The other barometer is VAT registration. Don't be tempted by a deal for cash. Cowboys who cut corners on tax will cut corners on your job.

References, references, references
The best references come from friends and family. If someone whose judgement you value has had a positive experience, trust them. Otherwise, ask your builder for several references from recent customers. Every previous customer will provide a slightly different insight. A good builder will also offer to show you a current project so you can examine the standard of workmanship.

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How to choose a builder