The regulatory QR and your enquiry QR
Some property regulators want their own QR code on your ads, so check the rules where you sell. In Maharashtra, India, MahaRERA has required every advertisement for a registered project to carry the project's MahaRERA QR code, beside the registration number and website address, since 1 August 2023, and it has fined hundreds of projects that left it out. That code comes with the project's MahaRERA registration and opens the project's page on the MahaRERA website; its job is compliance. MahaRERA has since tightened the size and placement rules, so check its current orders, and your own regulator's rules, before you finalise artwork.
Your enquiry QR is a separate code with a separate job: capturing the buyer's interest. Place it well apart from any regulatory QR and label both clearly (for example "MahaRERA registration" and "Scan for price list") so buyers scan the right one and the regulatory code stays easy to read.
The best-performing enquiry offers are concrete: the price sheet for a configuration, a free site-visit slot with cab pickup, or the floor plan. Ask for little on the form, a name and mobile number, and let your sales team qualify on the call.