How to Create a Construction Bid: Step-by-Step Guide

A well-built bid is the difference between winning profitable work and leaving money on the table. For subcontractors, the bidding process is where your entire project starts — get it right and you set yourself up for healthy margins. Get it wrong and you're either working for free or losing the job to someone who priced it tighter.

This guide walks through each step of putting together a construction bid, from reviewing plans to submitting your proposal.

Step 1: Review the Plans and Specifications

Before you touch a calculator, read the plans thoroughly. Go through the spec book section by section — not just your division, but adjacent trades too. You need to understand the full scope so you know where your work starts and stops.

Pay close attention to the general conditions, special conditions, and any addenda. Missed addenda are one of the most common reasons subs leave money out of a bid. Check for phasing requirements, schedule constraints, and liquidated damages clauses that could affect your labor plan.

Step 2: Perform Your Takeoff

The takeoff is the foundation of your bid. Whether you're counting fixtures, measuring linear feet of pipe, or calculating square footage of drywall, accuracy here determines everything downstream.

• Use consistent units. If you're measuring conduit in linear feet, keep everything in linear feet. Mixing units is a fast track to pricing errors.
• Account for waste. Material waste factors vary by trade — 5% for copper pipe, 10-15% for drywall, up to 20% for tile. Use the factor your crews actually experience, not the textbook number.
• Separate by area or phase. Breaking your takeoff into zones or phases makes it easier to verify quantities and adjust if the scope changes later.

Step 3: Price Your Labor

Labor is typically the largest cost in a subcontractor's bid, and it's where most estimating errors happen. Start with your crew composition — how many journeymen, apprentices, and helpers you'll need for each task.

Calculate your fully burdened labor rate, not just the hourly wage. Include payroll taxes (FICA, FUTA, SUTA), workers' comp insurance, health benefits, union contributions if applicable, and any per diem or travel costs. A $45/hour mechanic might actually cost you $72/hour once you load in the burden.

Apply production rates based on your crew's actual performance, not industry averages. If your guys hang 30 sheets of drywall a day on a good day, don't bid it at 40. Build in realistic allowances for mobilization, cleanup, and coordination time.

Step 4: Price Your Materials

Get current quotes from your suppliers — don't rely on old pricing. Material costs fluctuate, and a number that was good three months ago might be 15% higher today. Request quotes with a price hold period so you're covered through bid day and the expected award date.

Include delivery costs, sales tax (if applicable in your jurisdiction), and any specialty items that have long lead times. Flag long-lead items in your proposal so the GC knows about potential schedule impacts.

Step 5: Add Equipment, Subcontractor, and Other Direct Costs

Don't forget the costs that fall between labor and materials. Rented equipment like lifts, scaffolding, or trenchers. Any sub-tier subcontractors you're bringing in. Permits, testing, inspection fees, temporary protection, and dumpster costs. These items add up quickly and are easy to overlook.

Step 6: Apply Overhead and Profit

Your markup needs to cover two things: overhead (the cost of running your business) and profit (what you actually take home).

• Overhead includes office rent, insurance, vehicles, office staff, accounting, software, and all the other costs that exist whether you have a job or not. Most subs run 8-15% overhead depending on their size and structure.
• Profit is your margin after all costs are covered. 5-10% is common for competitive bids, though some specialty work or negotiated contracts can support higher margins.

Some contractors roll overhead and profit into a single markup. Others break it out on the bid form. Know what the bid documents require and be consistent.

Step 7: Format and Submit Your Proposal

Presentation matters. A clean, professional proposal tells the GC you run a tight operation. Include a clear scope summary that spells out exactly what's included and — just as importantly — what's excluded. List your qualifications, clarifications, and any assumptions you made.

Common items to clarify in your proposal:

• Work hours (regular time only, or does the schedule require overtime?)
• Access and staging area assumptions
• Whether temporary power, water, or hoisting is provided by others
• Material price escalation clauses for long-duration projects
• Payment terms and retainage expectations

Submit on time. It sounds obvious, but late bids get thrown out. Build in a buffer — if the bid is due at 2:00 PM, have it ready by noon. Use the submission method specified in the invitation: email, online portal, or hard copy.

Common Bidding Mistakes to Avoid

• Bidding every job. Be selective. Chasing too many bids spreads your estimating team thin and leads to sloppy numbers.
• Forgetting mobilization and demobilization. Getting your crew and equipment to and from the site has a real cost.
• Ignoring the schedule. A compressed schedule means overtime, stacking trades, and lower productivity. Price accordingly.
• Not visiting the site. Plans don't show everything. Site conditions, access limitations, and existing conditions can significantly affect your costs.