Yes, generally Web Development Companies charges around 1500/- per page for Static Page(SME's) and reputed (read big) companies can charge anywhere starting from 15k or something.
But Freelancers like me take around 3k - 5k (Including Domain + Hosting Charges) for a 4-5 Page Static Web Site.
So if you integrate little bit of PHP and all, it should come around within 6k for Freelancer.
But if you plan to use CMS, it may start from 10k - 15k. Depends on the concept though
For a average website with CMS, (from freelancer) consider anything starting from 8k.
The main difference is mostly for...
1. The company name matters, so comes the service, if you don't trust freelancers.
2. Generally freelancers are developers and don't waste on designing (writing own's) CSS, instead they use free template. While companies have designers for creating something specific for you.