Where commercial margin leaks after you win: contract review, change orders and retainage

You won the bid. The estimate was tight, the crew was ready and the job went in on schedule. Then the final numbers came back, and the margin you bid was not the margin you kept.

On commercial work, a lot of that leak happens after the award, not during the estimate. A contract clause nobody read. Extra work done on the roof because a superintendent asked for it. Retainage that sits unpaid long after your crew has moved on. None of it shows up as one big loss. It shows up as a slow drip across many jobs.

This piece covers the paperwork that protects a commercial job once you win it: reading the contract before you sign, documenting change orders before work starts, and tracking retainage through closeout. It is not legal advice. Have your attorney review any contract terms you do not fully understand.

Why this leak is easy to miss

Residential work trains a company to move fast. A homeowner signs, the crew installs, the invoice goes out and the job is done. Commercial work adds layers: a general contractor, a subcontract, pay applications, schedule changes, retainage and a closeout package.

If the company runs commercial jobs with residential habits, the paperwork falls through the gaps. The crew does what they are asked. The office bills what the estimate said. Nobody connects the two until the job is closed and the money is short.

Read the contract before you sign it

Many owners read the scope and the number and skim the rest. The rest is where risk hides.

Before signing a subcontract, someone in your company should understand:

Scope and exclusions. Does the contract scope match what you bid, including what you excluded?
Payment terms. When do you get paid, and what has to happen first? Is payment tied to the GC getting paid by the owner?
Retainage terms. How much is held back, and what releases it? Is release tied to your scope or to the whole project finishing?
Change order process. Who can authorize extra work, and in what form? How long do you have to submit a change?
Schedule and delay language. What happens if the schedule slips for reasons outside your control?
Warranty and closeout requirements. What documents are required before final payment?

If any of these are unclear, ask before you sign. A redline conversation before the job starts is easier than a dispute after the roof is on. Your scope discipline only protects you if the contract reflects it.

Document change orders before the work starts

Extra work is normal on commercial jobs. Unpaid extra work does not have to be.

The leak usually starts on the roof. A superintendent asks the foreman to handle something outside the scope. The foreman wants to keep the job moving and says yes. Nobody writes it down. Weeks later, the office tries to bill it, and the GC says it was never approved.

Put a simple rule in place: if it is not in the scope and not in writing, it does not get done yet. That does not mean slowing the job down. It means the foreman knows exactly who to call, the project lead knows how to write up the change, and the change gets signed before the crew starts.

A workable flow looks like this:

The crew spots or is asked to do work outside the scope
The foreman stops and calls the project lead before starting
The project lead documents the change, with photos and a description
The GC approves it in writing, using the process the contract requires
The approved change goes to billing so it lands on the next pay application

Train the crew on this rule the same way you train them on safety. If your field team believes saying yes keeps the customer happy, they will keep giving away work.

Track retainage through closeout

Retainage is money you already earned. It is also easy to forget once the crew leaves the site.

Treat retainage as its own line in your collections. Know how much is held on each job, what releases it and what documents closeout requires. Warranties, as-built details, inspection records and lien waivers often all need to be in hand before final payment moves.

Assign someone to own closeout on every commercial job. If closeout belongs to nobody, it waits until the owner notices the money is missing. Your cash collection rhythm should include retainage and closeout status, not only current billing.

Who owns each step

These leaks grow when the work belongs to everyone and no one. Give each step a clear owner:

Contract review: the person who owns win-work, with the owner and your attorney on anything unusual
Change orders in the field: the foreman stops, the project lead documents
Change orders in billing: the office adds approved changes to the next pay application
Retainage and closeout: one named person per job until final payment lands

Your award handoff is the right moment to pass contract terms from sales to production, so the project lead knows the change process and retainage terms before day one.

Review it every week

Put open change orders, pending pay applications and retainage balances on the agenda in your weekly operating rhythm. Small issues are easier to fix when they are a week old than when they are a season old.

Over time, the pattern also tells you which customers respect the process. That feeds straight back into vetting general contractors before you bid. And it shows up in job costing, where the gap between bid margin and actual margin finally gets explained.

A quick self-check

Before your next commercial job starts, ask whether someone read the full contract before it was signed, whether your foremen know to stop before doing extra work, whether every change gets approved in writing before work starts, whether approved changes reach the next pay application, whether you know the retainage balance on every open job, and whether one person owns closeout on each job. If any answer is fuzzy, that is where your margin is leaking.

Next step

If you want to think through where margin leaks after the award in your commercial division, talk it through with our team. It is a one-on-one conversation about your company.