The question most people want answered first, but realistically you need to know answers to every other question first before a quote can be close to accurate.
A better way of asking is “what’s your website worth to your business?”.
A website’s worth is severely limited if it’s not integrated with your online and offline business. So “building a website” is a somewhat futile process unless the people who build it “know” business well, especially your business.
Think about what you spend in marketing and advertising costs – how much does it cost you to get your print advertising message spot on? And yet so many people think a website costs a few thousand dollars and it will magically start pushing never-before-seen levels of sales inquiry to you. It just doesn’t work that way.
The “smarts” are in the approach and the strategy and the sales process – a beautiful site is useless if it misses its intended market.
And you need to understand this isn’t a “build it and they will come” exercise. After you’ve built the site you will need to continue to work on the business case and measure and refine just like any other ad/marketing medium.
Of course, using a professional firm like Kook means you will get to that end a lot faster than a cheaper solution, but nevertheless you should be prepared to roll up your sleeves for the long-term because there’s no silver bullet.