Nailed it, @Abdul_Rahman. The line I come back to: a quote isn’t a price, it’s a description of the work. If the description is vague, the price doesn’t mean anything.
Quick GTA example to back this up. Legitimate interlock patio work this season is sitting $25–$60/sqft, but quotes are coming in at $10–$15. The gap isn’t profit margin — it’s 3 inches of base instead of 10, no geotextile, plastic edge restraints, pavers without a freeze-thaw rating. Homeowner pays for the “savings” in year 3 when the patio heaves. More on that here: The 12-inch rule.
The test I give people: ask the contractor to put four things in writing — base depth measured compacted, specific polymeric sand brand, disposal fee, and settlement guarantee in years. A real trade answers in two minutes. The cheap quote changes the subject.
Transparency beats temptation — most homeowners just need the questions to ask.