Nowadays, you need rather more pages than you think are strictly necessary. Google expects you to have some pages of general interest about your business sector, so more pages are advisable.
Here we list the pages that are essential, and those that are useful or recommended. The pages will be listed in a navigation menu so that people can switch from one page to another easily. Remember, that just a few pages is not enough. If you are wondering how on earth you can write five to ten pages for your site, don't worry. We offer a very inexpensive article writing service.
Here are the pages in order of importance:

In this page you give information about the products and services you offer, and why these are such good value, exceptional products, your service is better, etc. If you sell on line, it should also have a link to any special offers, or free reports.
Then include some text about why people should purchase from you.

One or more pages listing your products or services. Obviously, the number of pages required to sell plumbing components, will be far greater than a site listing the services of a dental surgeon or recruitment agency. This section should include about three pages.

This is not essential, but is recommended as a means of getting more business. It could be a report on 'How to shop for XXX.'

Who you are, what you do, how long you have been in business, and any testimonials you have.

If you collect names and email addresses or other information about clients, you must have this page (To save you making a page just for this we can combine it with the Contact Us page)

In the UK your website must have:
UK: Company name, registered office address, where registered;
Here you ask people to sign up for any free offer you may have or to receive information about free offers. Once people have signed up they need to confirm that they have signed up to meet current regulations. This is called 'double opting-in'.
How to choose a wooden flooring, etc;
Pitfalls to avoid in hiring a plumber, etc;
What you need to know before getting double glazing installed;
Questions to ask an injury compensation lawyer.