Why do plumbers need a website?
Why do plumbers need a website? Because plumbing is an emergency trade, and emergencies get searched, not browsed. When a pipe bursts at 11pm, the homeowner types "emergency plumber near me" and calls the first result that looks legitimate and answers the question. Your Google Business Profile competes for a handful of those map results and stops there. A website catches the rest: the "water heater replacement" searches with your town attached, the "how much does a repipe cost" searches, and the neighbor referral who Googles your name before dialing.
Plumbing also carries a trust bar most trades do not. It is a licensed trade with expensive failure modes, so homeowners check the license number, the insurance, and the reviews before letting anyone under the house. A one-line profile cannot carry that proof. A site with your license displayed, your reviews pulled from Google where they can be verified, and a photo of an actual human can.
Layout matters as much as existence. An emergency visitor on a phone should see a tap-to-call number without scrolling, and a non-emergency visitor should land on the exact service page they searched for, not a generic services list. That is the whole discipline behind plumber website design: one page per service, one page per town, phone number everywhere.
If you already have a Google Business Profile, the site can be generated from it in minutes, reviews and photos included.