How to Bid Construction Jobs: A Beginner's Guide

Read the scope before you price anything

Start by reading plans, specs and addenda line by line. Anything you miss in the scope becomes a cost you absorb.

Visit the site if you can. Note access, parking, existing conditions, utilities and anything the plans do not show. List what is included and what is excluded, and write both into the bid.

Ask questions early and in writing. If the owner or general contractor answers by phone, confirm by email so you have a record. Many disputes start with an assumption nobody wrote down.

Build the estimate from the ground up

Break the job into tasks, then price labor, materials, equipment and subcontractors for each. Do not guess a lump sum.

A takeoff is the count of materials and quantities the plans require. Price each item from current supplier quotes, not from memory. Then estimate labor hours by task and multiply by your loaded labor rate, which includes payroll taxes, insurance and benefits.

• Materials, with a waste allowance
• Labor at the fully loaded rate
• Equipment rental or ownership cost
• Subcontractor quotes
• Permits, dumpsters, travel and cleanup

Build in a contingency for the unknown. Many contractors use a small percentage of direct cost, set by the risk of the job.

Add overhead and profit

Direct cost is not your bid. You must add overhead and a profit margin, or the job will not pay for your business.

Overhead covers costs that are not tied to one job: office, insurance, vehicles, software, owner time. Divide your annual overhead by expected annual direct cost to get a rate to apply to every bid.

Here is an illustrative example. Direct cost for a job is $40,000. Overhead at 15% adds $6,000, and a 10% profit target on the subtotal adds about $4,600. The bid lands near $50,600. A bid at $42,000 would look cheap and lose money after overhead.

The difference between markup and margin trips up many beginners. Check your math with your accountant. Our guide to construction accounting explains job costing.

Write a clear proposal

A clear proposal states scope, price, schedule, payment terms, exclusions and how changes are handled.

Keep it plain. Include:

1. A summary of the work and the price
2. Inclusions and exclusions
3. Start date and expected duration
4. Payment schedule and late terms
5. A change-order process
6. How long the price is valid

Have a contract reviewed by an attorney in your state. Licensing and bonding rules vary by state and trade, so confirm what your jurisdiction requires before bidding.

Common beginner mistakes

The usual errors are underpricing to win, skipping contingency, forgetting payment delays and bidding jobs outside your skill.

• Chasing the lowest price. The cheapest bid often wins and loses money.
• Ignoring schedule risk. Delays raise labor and equipment costs.
• Taking jobs outside your trade. Learning on a client's budget is expensive.
• Weak payment terms. Net 60 or pay-when-paid clauses can strain your cash.

If you are weighing whether to bid smaller or larger jobs, starting a general contractor business covers licensing and early steps.

Plan the cash flow before you win

You pay for labor and materials weeks before the client pays you. Estimate your peak cash need for each job before you submit the bid.

Map the job week by week. Show when you pay crews, suppliers and subs, and when draws arrive. The lowest point on that chart is the cash you must have on hand.

Retainage, where a client holds back part of each payment until completion, makes the gap longer. Short-term tools like working capital or a business line of credit can bridge it if the margin justifies the cost. ROI Funder considers 6+ months in business, $20,000+ monthly revenue and 500+ FICO. Note that many funders restrict new residential construction and residential remodeling, so ask before you assume.