Web builders come in all shapes and sizes.  Here are a few pointers on what to expect from different kinds of firms.

Small "sole proprietor" shops: These include firms with a few employees who have a good general knowledge of HTML, scripting and graphic design. Small firms may also hire freelance employees who provide database, programming or e-commerce services on a case-by-case basis.

Pros: Small firms are inexpensive.
Cons: Beware of small firms that stretch themselves too thin.

Medium-size Web development shops: These firms employ up to a few dozen employees spread across several technical specialties. They can handle most projects in-house, and they may also provide marketing or advertising services.

Pros: These firms can provide one-stop shopping at a reasonable price.
Cons: Many Web firms are growing too quickly, and they may not be able to provide consistent service or support.

Large interactive firms: These shops provide end-to-end planning for even the most complex Web development projects. In addition to first-class technical expertise, a large firm can offer marketing and brand management services, develop online advertising campaigns, and provide custom systems integration and consulting. Some of the largest firms, such as USWeb/CKS, have morphed into international franchises with dozens of branches and hundreds of employees.

Pros: These established firms can handle any project.
Cons: You'll pay dearly for their services.