Contractors rely on one advantage: you do not know what things cost. Most overcharging is not fraud — it is a contractor testing whether you will push back. These seven patterns are the warning signs.
1. The quote arrives as a single number
No labor breakdown. No parts list. No hourly rate. Just a total. This is the single biggest red flag. Legitimate contractors itemize because itemized quotes win jobs. A round number with no detail means the contractor is guessing — or hoping you will not ask questions.
2. They cannot explain the markup on parts
Contractors typically mark up parts 10–30% above their cost. That is fair. A 100–200% markup is not. Ask what they paid for the part and what they are charging you. If they refuse or get defensive, that tells you everything.
3. The quote changes after the job starts
Legitimate surprises happen — a plumber opens a wall and finds water damage that was not visible. But a quote that inflates by 30% or more after work begins, with vague explanations, is a pattern, not a coincidence.
Check your home repair quote now — free, no sign-up
Check My Quote →4. They push urgency hard
"This needs to be fixed today or it will get much worse." Sometimes true. Often a pressure tactic to prevent you from getting a second quote. If the job can genuinely wait 24 hours, get a second opinion. Most can wait.
5. No written contract before work starts
A verbal agreement is not a contract. Any contractor who resists a written scope of work with a fixed price is leaving themselves room to bill more later. Do not authorize work without a signed document.
6. They cannot give references from similar jobs
Not past clients in general — specifically clients who had this type of work done. A contractor who has done 50 roof repairs should be able to name three people who will answer the phone. If they cannot, that is data.
7. The quote is dramatically lower than everyone else
A quote 40% below market is not a deal. It is a signal. Corners will be cut somewhere — materials, labor, permits, or all three. The cheap job that has to be redone costs more than the fair job done right the first time.