If you are considering a web company, check their site. Do you like it? Does it look good? Does everything work well?

If you don’t like their site, you may not like the one they build you.

If you do like the site, ask them the following questions:

About how many person hours went into the site?
If they can’t answer this, they may not manage their projects well. Usually, the company site is handled as an informal project, interleaved with client projects. Professional service organizations are selling labor, and should be tracking ALL hours - whether they bill them to clients or not. That’s good business.

About how much would you charge a client for a similar site?
This number should be reasonable, and in line with the earlier answer.

What percentage of the project hours are management/overhead?
High caliber technical teams need less management.