Plumbing and heating
A website for plumbers starts with the emergency: someone with a leak calls the first plumber they see who has a phone number to hand and covers their part of town. So the website shows the area you cover and whether you take out-of-hours call-outs right at the top, and gives drain unblocking, boilers, water heaters and immersion tanks their own pages. If you also work on gas or central heating, it gets its own section, with whatever certification you hold.