How do I stop underbidding and losing money on construction jobs?

Underbidding is usually a process problem, not a discipline problem

Most contractors do not underbid because they want to lose money. They underbid because the estimate is built too fast, too loosely, or with assumptions that are never tested before the bid goes out.

Underbidding hurts in two ways: you lose margin on the job you win, and you can also train your market to expect unrealistically low numbers that are hard to sustain.

The main causes of underbidding

1. Labor is too optimistic

Labor is where many bids drift off course. If you estimate production too aggressively, ignore setup time, or fail to include supervision and rework risk, the labor number will look fine on paper and fail in the field.

2. You forget job costs outside the obvious scope

Travel, mobilization, waste, small tools, dump fees, temporary protection, and admin time can quietly add up. These are not “extras” in the real-world sense; they are part of doing the work.

3. You are not carrying burden correctly

Labor burden, insurance, taxes, vehicles, and other overhead items need a consistent method. If you bury them randomly in markup or spread them across a spreadsheet with no standard logic, some jobs will be underpriced by default.

4. You copy old estimates

Copying a prior job is tempting because it is fast. The risk is that every project has slightly different conditions, and small misses compound quickly.

5. You do not review bid risk

Some projects have tight access, phased work, existing-condition uncertainty, or coordination complexity. If you price them like clean jobs, you are not protecting your margin.

How to stop underbidding

Step 1: Build the estimate from the bottom up

Start with quantity takeoff, then direct material, then labor, then equipment, then burden, then overhead and profit. If you skip the structure and jump straight to a lump sum, it is easier to miss something.

Step 2: Use a scope checklist by trade

A good checklist should force you to think through the work in the same order every time. For example:

• Does this include prep and cleanup?
• Does it include access, staging, and protection?
• Are permits, testing, and closeout included?
• Are all alternates and exclusions clearly marked?

Step 3: Price labor with realism

Use field feedback. If a crew consistently takes longer than your spreadsheet says, the spreadsheet is wrong. Update production rates based on actual jobs, not hope.

Step 4: Standardize your overhead logic

Do not reinvent markup for every bid. Decide how you handle overhead, profit, insurance, and contingency, then apply that logic consistently.

Step 5: Add a pre-submit review

Before you send any bid, review:

• Scope completeness
• Current material pricing
• Labor production assumptions
• Burden and markup
• Exclusions and clarifications
• Deadline and delivery format

That five-minute review can save thousands of dollars.

Trade examples of where underbidding happens

Electrical

Underbidding often comes from missing device counts, control wiring, fire alarm coordination, or overtime caused by phased occupancy.

Plumbing

Common misses include rough-in supports, insulation, testing, tie-ins, demolition, and fixture trims that were assumed but not counted.

Concrete

Estimators may miss forming complexity, rebar ties, finishing time, cure protection, or access constraints that slow the crew.

Framing

The estimate can fall short if you ignore waste, layout time, hardware, blocking, bracing, or elevation changes.

Why spreadsheets make underbidding harder to catch

Excel can work, but it depends on discipline. The problem is that spreadsheet estimates often hide assumptions in formulas, cells, or copied tabs. That makes it easier to reuse the wrong number and harder to see where margin is leaking.

A cloud estimating system like OneEstimate helps reduce that risk by making unit pricing, reusable items, and estimate structure more consistent. It is especially useful when your biggest problem is repeating the same estimate workflow without the same mistakes.

A simple anti-underbidding checklist

Use this before every bid:

• Have I included every scope item?
• Are my labor rates and production rates current?
• Did I add burden and overhead the same way I do on every job?
• Did I account for risk, access, and phasing?
• Can I explain my number without opening ten spreadsheet tabs?

If any answer is no, the estimate needs more work.

Where software helps, and where it doesn’t

Software will not tell you what a job should cost if your field knowledge is weak. But it can help you avoid formula mistakes, keep pricing current, and standardize the process so underbidding becomes less likely.

OneEstimate is a good fit for contractors who want a faster, more consistent estimating system than spreadsheets provide. It supports repeatable pricing logic and cleaner bid delivery, which can help protect margin.

If your problem is broader than estimating — such as job costing, purchasing, progress tracking, and project controls — then a management ERP like OneMake may be the better long-term system. But the underbidding problem starts in estimating, so that is the first place to fix.