There is no correct number. A site with too many thin pages is harder to keep up to date and harder for a visitor to read. A site with too few leaves people without an answer and they leave.
The five pages almost every site needs
Home. What you do, who it is for and what to do next.
About. Who is behind the business and why someone should work with you.
Services. What you sell, how it works and what it costs if you can say so.
Work. Examples of what you have done. If you have none yet, describe the work in plain language instead.
Contact. An email address, a phone number or a form. One of them is enough, three is better.
Pages to add when you have a reason
Pricing. Useful when your prices are fixed and easy to explain. If every quote is different, a page that explains what shapes the price works better than a list of numbers.
Questions. A short list of the things people ask you on the phone saves both sides time.
Articles. Only if you will actually write them. An empty blog looks worse than no blog.
A note on content
The number of pages matters less than the quality of what is on them. Five pages written clearly will outperform twelve pages of filler, and they are far easier to keep current six months later.
Where to start
Write out the questions your customers ask you before they buy. Each important question is a page, or a section of one. That list, plus the five above, is usually the right size for a first version.
You can build the list with the planning checklist in our library, then send it to us with your brief.