Before hiring a contractor for polishing concrete, there are a few things you should know about. Saying you want polished concrete is almost like saying you want tile flooring, polished concrete is a relatively broad category . Like tile flooring, there are many options to choose from when you have your concrete polished. For instance, you can have large stones or small stones exposed in the initial grinding or you can have a very high shine (3000 grit finish) or a lower shine (800 grit). After the concrete is polished it is also recommended to be sealed to prevent stains. There are two main types of sealers used for polished concrete, a guard (film forming sealer) or a penetrating (non-film forming sealer).
So before you hire someone, make sure the contractor goes over all the steps and if a sealer will be used. If you just ask for a price for polished concrete with out stating the details, one contractor might give you a price to polish to a 800 grit finish and apply guard (it will enhance the shine), while another contractor might give you a higher price but it is for polishing to a 3000 grit level and using a penetrating sealer (will not enhance the shine).