These statistics draw on three categories of evidence: publicly available search trend data from tools like Google Trends and keyword research platforms, industry-wide estimates published by search marketing research organizations, and observed ranges from campaigns we've managed for interior design and adjacent professional-service firms. Where a figure comes from one of those categories, the text says so, and observed campaign ranges are not presented as universal benchmarks.
Figures drawn from public tools can be rechecked against the relevant tool for your own market, industry estimates carry that label, and campaign observations describe the firms in those campaigns rather than the entire interior design market.
For decision-making, evaluate each benchmark on four dimensions: the population being described, the metric definition, the observation period, and the comparison group. A useful benchmark tells you whether it refers to residential or commercial design, whether a conversion means a call, form, booked consultation, or another event, whether the data is local or national, and whether the comparison is between similar firms.
Benchmarks vary significantly by market, firm size, and service mix: a boutique residential designer in a mid-size city competes in a fundamentally different search environment than a commercial fit-out firm in a major metro. Use these figures as orientation, not prediction, and test them against your own Search Console, analytics, local profile, inquiry records, and ranking history before treating any benchmark as a forecast for your firm.