Static websites are ideal if you want to provide information on your services/products but do not need to update continuously or your website has no special functions that are driven by a database. Also any site that is less than perhaps 5 pages falls within this category unless you are going to be updating news and products often.
Sites of more depth and of a larger scale than this will need some sort of content management system attached to them as you will find that updating it becomes more necessary.
It all depends how often you think you might update your website. Call: 01273 252 203