How do I add a second trade without hurting the SEO I already have?

Add the second trade as a full service section on your existing domain rather than a new website. A separate site splits your links, reviews and authority in half and usually takes a year to catch up.

Build a parent service page plus city pages for the new trade, add the category to your Google Business Profile, update your services list and schema markup, and start collecting reviews that mention the new work by name. If the two trades serve different buyers, such as plumbing for homeowners and backflow testing for property managers, keep the navigation and conversion paths separate even though the domain is shared.

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