Read the evidence boundary before using any benchmark. The source describes observed ranges from engineering and professional-services campaigns plus publicly available industry material, but it does not include exact supporting URLs, a reproducible sampling frame, or a documented statistical methodology for the claims on this page. References to Google Search Console aggregates, SEMrush reports, and BrightEdge B2B research therefore should not be treated as verified third-party support here unless the supporting source is separately reconciled.
Engineering search also spans materially different disciplines, including civil, structural, mechanical, environmental, geotechnical, MEP, and related practices. Project-bid firms, technical consultants, and retainer-based service businesses can have very different query mixes, buying processes, office footprints, and attribution patterns. A benchmark only becomes decision-useful when the edition, sample, period, metric definition, and market context match the question being asked.
Planning rule: treat all ranges as directional observations, not performance guarantees. Compare them against the firm's own Search Console, analytics, CRM, proposal, and intake data before using them in forecasts or board-level targets.
The source also distinguishes campaign observations from broader industry estimates and notes that ranges should not be interpreted as a single midpoint. For an engineering leadership team, the safest use is comparative: identify whether your own search visibility, qualified inquiry rate, or time-to-impact is materially outside the observed pattern, then investigate why. That keeps the benchmark in its proper role: a reference point for diagnosis, not proof of causality.