Lead volume is easy to buy. Lead quality is not. For construction, the difference comes from targeting, creative and the qualification step after the click.
Use creatives that show real project finish and process so the people who tap are already serious. Add one or two qualifying questions to the lead form, such as plot status or budget range.
Follow up on WhatsApp within minutes and track every lead through to site visit and closure. Cut campaigns that bring cheap leads that never convert and scale the ones that bring bookings.