The cost of a website varies. It depends upon the amount of information, number of pages and number of photographs/images it is to contain. It is also dependent on whether or not original artworks/logos are to be created for the site.
A single page including domain name and 12 months hosting will cost approximately £200, with extra pages (dependant on content) costing from £80 each.
Obviously each site has to be treated on it's individual requirements, but these figures should give you a fair idea of cost.