Help choosing a builder please

hollyblue

I need to employ a builder for some quite extensive property renovation.

I've never done this before, I've always relied on my dad, but this is just too big for him.

I wonder if anyone has some suggestions re: the following:-

1. finding the right builder i.e. someone that can do 'the works' (to include plumbing & electrics )

2. or is it cheaper to employ someone to do the building works separately to plumbing/electrics

3. is it reasonable to ask a builder for references from previous customers, if not how do I go about finding 'reputable' tradesmen

4. should I be looking out for specific qualifications i.e. corgi registered etc

5. anything other tips!

Thanks guys