Good Chimney Contractor Needed

I am looking into either removing and replacing an existing boiler flu (because it is small than it should be) or adding a separate flu for the hot water heater (so the boiler can have it’s own flu) and I wanted to see if anyone here has recommendations for a reasonable contractor to do this work. While I’m at it I may also want to cap my rear chimney, as the current capping situation is a little strange. Any recommendations would be appreciated!