Choose one page when the offer is simple
One page works well when visitors need a short explanation, a few trust signals, and a contact option. It is cheaper to build and easier to keep current.
Choose multiple pages when the topics are genuinely different
If a contractor offers roofing, siding, decks, and remodeling, each service may deserve its own page. That gives customers more useful detail and gives search engines a focused page for each topic.
What about SEO?
A one-page site can rank, especially for a business name or a narrow local service. A multi-page site usually has more room to target distinct services, questions, and case studies without forcing unrelated material onto one page.
A practical rule
It is usually better to start with one good page than five thin pages. Add pages when they have a real job to do.