Quick answer: Five pages is enough: home, services, about, one proof or blog hub, and contact. Link them in the header and in the body.
A small site still needs a map. Here is the one we use. This guide is written for businesses in the UK and Kent, Surrey and Greater London.
The map
Do not add pages you will not maintain. Depth beats width.
Navigation
Four items in the header. Contact as a button.
URLs
Short, human, lowercase. No dates in service URLs.
Build
From £150 with SEO Friendly Website Design. Get the map first.
Frequently asked questions
Do I need a shop?
Not if you sell a service. A quote form is the checkout.
Blog in the header?
Yes if you publish. Hide it if the hub is empty.
Landing pages extra?
Add them for ads or distinct services, not for every synonym.