Three things: real local SERP data, a direct working relationship instead of a layered account-manager chain, and trade-specific knowledge of the roofing market.
Real local SERP data means the audit pulls what customers in your specific town actually see when they search. National agencies run the same query from whichever city their data center sits in and get a different result; the audit they produce ends up shaped by their city, not yours. Boston-area roofing has a specific competitive set (the specific competitors, the price clustering, the seasonal demand curve), and an audit grounded in that data lands findings that generic audits do not catch.
A direct working relationship means no account-manager layer between you and the person changing the bids, reviewing the copy, and fixing the tracking. The cost of running fewer accounts is not subsidized by ad spend; it is structured into a flat-fee model that aligns the work with the result.
Trade-specific knowledge means the audit catalog covers manufacturer dealer tiers (GAF Master Elite, Owens Corning Platinum, CertainTeed SELECT) doing real trust work; insurance-claim work as 30-50 percent of revenue for most operators; lead-aggregator burn (Modernize, Networx, HomeAdvisor) on the cheap-lead-bad-close-rate math. The audit fires findings against those specific patterns, not against a generic small-business marketing checklist. The roofing vertical depth is actively building; the audit machinery itself works today.