Plumbing calls split into two kinds. Some are a water heater getting old or a bathroom you want redone, and the customer has time to compare. Others are water on the basement floor right now, and the customer wants a number they can dial without hunting for it. Your site has to serve both without making either one wait.
Harborline Plumbing & Heating is a made-up company we use to show how that works. The emergency line stays visible at the top of every page, the request form lets people mark a job as urgent, and the chat assistant points anyone describing a burst pipe or no heat straight to the phone. Planned work like drain cleaning, sump pumps and tankless conversions gets its own pages, so those customers can read up before they ask for a price.