At some point an agency will pitch you the math. Take your list of services, take your list of towns, build a page for every combination. Each one, the pitch goes, catches its own search.
What you get back is the same page over and over. Same paragraph about the maintenance plan. Same photo of the same van. A different town name in the headline. A homeowner who opens two can tell at a glance. So can Google. It may treat them as copies and show only one, and a large stack of near-identical town pages can read as built for search engines rather than for people.
The principle underneath all of this lives on our root site: rebuild your website without losing your rankings.
Coverage is not the same thing as depth
Your coverage area is real. Every town in it should be named somewhere a homeowner can find. That's not the same as every town getting its own page.
A town earns its own page when you have something true and specific to put on it. The neighborhoods people name when you ask where they live. Whether those houses run heat pumps or older gas furnaces, because the questions are different. How long a truck really takes to get there from the branch that dispatches it. Jobs your technicians finished on those streets. Reviews from homeowners who live there.
Write that and no competitor can copy it, because it came out of your job history instead of a template. If the only local detail you can come up with is the town's name, that town doesn't need a page. It needs a line on your coverage page, the one page that lists everywhere you work.
What the coverage page carries
That page names every town and neighborhood you serve. Group them the way a homeowner would, by the part of the county they live in, not the way dispatch does. Give each group a plain sentence about what coverage there looks like, including where it thins out.