Where practical try to visit a showroom or view other work carried out by the contractor. Alternatively ask to talk to other customers on the product. Do bear in mind however how the company may well give a reference that will be complimentary. Plus ask specific questions with regard to - Did they arrive on days? Was any thing missing in a manner that quickly was this fixed? Did they leave the site clean and tidy? Don`t always expect \"perfect answers\" - actually be suspicious if may well. Any type of building work or remodelling get its problems or unforeseen challenges. Clear is that accidents \"how quickly was it sorted and was it to your satisfaction\". It is usually been stated that the true test of a typical company location there are problems - not when everything goes perfectly.