A colour change means entirely altering the colour of your hair, making it look completely different. This is something you may want to consider if you want a new look, or you are seeking a way to change your appearance. If you are a thinking about a new colour, it is best to consult with a stylist to get their professional opinion.
A colour change may or may not be expensive, depending on what you would like. For example, a new all over colour is going to be cheaper than having highlights all over your hair. It will also depend on the condition and length of your hair as it currently is. Longer hair will require more colour to cover it, making it a more expensive procedure. If your hair is in poor condition, you may need a conditioning treatment first, which will cost more but will make your hair healthier in order to get a good quality colour.