An unqualified consultation costs a day, not an hour
The design and estimating process is expensive enough that lead volume is the wrong thing to optimize.
Measuring a room, working through a layout, specifying materials and producing a price is real work. Doing it for somebody whose budget is a fraction of the project is a day nobody gets back.
That reverses the usual advice. Measures that reduce inquiries while improving fit are frequently correct here, and they look like failure in every default report.
Budget is the awkward conversation and the necessary one. Establishing a range before an appointment is booked, in a way that does not read as gatekeeping, is the single largest lever on wasted design time.
Publishing indicative ranges does some of this work before anybody makes contact, which is more comfortable for everyone than the same conversation on the phone.
Charging for design is a legitimate model that changes the economics completely. Fewer consultations, better qualified, and the work is paid for. It costs volume, and the volume it costs is mostly the part that was never going to convert.