Ask any developer their marketing budget and they answer instantly. Ask what their last qualified lead cost — asked about price, matched income, booked a viewing — and you hear silence. That silence is the most expensive line in the budget.
Why this number specifically?
Because it's the only bridge between marketing's language and sales' language. Views don't buy villas, and enquiries include the curious and the renters. The qualified lead is the first point in the funnel that means something to the sales number — everything before it is merely a means.
How to compute it in practice
- Define "qualified" in writing with the sales team: matching budget + genuine contact + booked viewing (or what fits your project)
- Tie every enquiry to its source: which campaign, which ad, which channel — automatically via the system, never manually
- Divide each channel's spend by its qualified count monthly — never blend channels into one number
The numbers will surprise you: in our accounts, the gap between the best and worst channel for the same project reached 4x — while budget was split between them almost evenly.
What do you do once you know it?
Three decisions become possible immediately: shifting budget weekly toward the cheaper-qualifying channel, setting a rational bid cap for ad auctions (target qualification cost × qualification rate), and holding any agency — us first — to a number that can't be dressed up.
