Welcome to GA, this is my opinion on tradesmen in the area, some are excellent, some are good and some are awful in equal amounts. Whilst recommendations are essential please always bear in mind that many people who give them might be friends and family and not genuine paying customers, in 20 years on GA ive lost count of the cowboys who got glowing feedback but leaving carnage behind them. It also used to be the case that you had to wait 6 to 12 months for the best trades because they were so busy others could fit you in this thursday.if possible try and look at similar refurbs near you a decent builder will show you there recent project if available.Lastly paperwork and receipts ,some do it properly whilst others are a mobile number and cash only, always be clear before any work starts to save confusion at the end.