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How to Bid a Job as a Contractor or Subcontractor

Bidding is estimating with competition. The goal is not the lowest number — it is a price you can win and still make money on.

Updated October 27, 2026 · Written for small contractors and trade crews

Read the whole scope first

Read the drawings, the job description or the customer’s request end to end before you price anything. Write down questions. On subcontract bids, note what the general contractor expects you to include (cleanup, permits, materials, equipment).

Take off materials and labor

Add overhead and profit

Overhead is what it costs to run the business even on days with no job: truck, insurance, phone, tools, software, office time. Spread it over your billable hours or jobs. Profit comes on top — it is what pays for slow months and growth.

Write exclusions and assumptions

Say what is not in your number and what you assumed (“existing panel has capacity”, “walls open for access”). This is where most money is lost on bids that were won.

Submit clearly and on time

Send a clean, itemized bid before the deadline, with your license and insurance details if they are asked for, and a date the price is good until.

Questions

Should I bid low to win the job?

Bidding below your real cost wins work that loses money. Compete on clarity, speed and reliability; bid the price the job needs.

What is the difference between a bid and an estimate?

People often use the words the same way. A bid is usually a price submitted to win a job against others; an estimate is your best price for the work as you see it.

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