You should check with the Co Co if your builder can actually tap into the main.
Some Co Co's insist that only co co plumbers/water overseers can do a connection i.e you pay for the road opening licience, you pay the guy on the excavator to expose the existing main, you supply the self tapping ferrule( its the connection that goes onto the main) the council guy then fits this even tho its a 3 min job.
As a prev poster said you are then responsible for backfilling and reinstating the excavation.
A wee bit of advice on that , dig as small a hole as possible and get lean mix concrete to back fill it up to 60mm to the top then put the macadam in. Concrete might be expensive but its not gonna sink too much as opposed to granular backfill.