Desk research against primary sources, with the issuing authority linked where a page states an official fee, rule or deadline.
The construction-linked milestones in the 5–20% range are staged against actual progress rather than a fixed calendar, so a delayed project also delays when the next instalment is due — payment pace tracks the building, not the date on the contract. That is different from the 10–25% booking deposit and the signing payment, both of which are due on fixed dates regardless of how construction later performs.
Post-handover plans spreading 30–50% over the years after completion are usually not a discount against the total price; that flexibility tends to be priced into the headline figure rather than offered for free, so comparing two projects on the size of the deposit alone misses the real cost. Compare the full payment schedule and total price together, not the size of any single instalment on its own.
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