Commercial vs Residential Contracting: What Really Changes

September 22, 202615 min read

Commercial work is not bigger residential work. The job may be the same trade with the same crew, but the money behaves differently: you are paid by a process instead of by a person, the invoice waits on a purchase order and an approval cycle, a percentage is often held back until the whole project closes, and the paperwork around the work is part of the work. Residential is fast cash and high margin per hour. Commercial is slow cash and steady volume. You can run both, but not on the same terms, the same overhead rate, or the same amount of working capital. CRMb shows margin on real punched hours per job and per customer, which is how you find out which side of the business is actually paying you.

Most trades drift into commercial work by accident. A property manager calls, the job goes well, another one follows, and eighteen months later half the revenue is commercial and the bank account feels tighter than it did when the business was smaller. Nothing went wrong. The business changed shape and the pricing did not. This guide covers what changes, what it costs, and what to put in place before you take the next commercial job.

The money moves differently, and that is the whole difference

Everything else in this article is downstream of one fact: a homeowner pays you, and a commercial customer's system pays you.

A homeowner decides, hands you a card, and it is done. There is no approval, no cutoff date, no accounts payable queue. If something is wrong they tell you directly, and you fix it directly.

A commercial customer has a chain. Somebody on site accepts the work. Somebody in an office matches your invoice against a purchase order. Somebody approves it. Somebody runs the payment cycle, often once or twice a month on fixed dates. Each link is a place your invoice can stop moving for reasons that have nothing to do with the quality of the work.

The practical consequence: on residential jobs your job is to do good work and ask for the money. On commercial jobs your job is to do good work, then produce a billing package that passes through four people who never saw the job.

Who pays you, and how long that takes

Payment terms are the clearest fault line between the two sides. Residential work should be due on receipt or Net 7 — the customer is standing in front of you and has no reason to wait. Commercial work runs Net 30 as a default, Net 45 or Net 60 with large general contractors, national property managers, and municipalities. See invoice payment terms explained for how each term behaves.

Three things stretch the real wait well past the stated term:

The billing cutoff. Many commercial customers accept invoices only up to a fixed date — the 25th of the month is common. Finish on the 26th and your Net 30 clock does not start for another thirty days. Ask for the cutoff date on day one and schedule your invoicing around it, not around when you happen to get to paperwork.

The approval cycle. Even a clean invoice sits while somebody matches it to the purchase order and signs off. Budget a week or two before the term even begins.

Retainage. On construction work a percentage — usually 5% to 10% — is held back until the entire project is complete and closed out, which can be months after your part finished. That money is yours, it is just not available. See how retainage works in construction.

Put together, a commercial invoice that says Net 30 routinely lands 50 to 70 days after your crew was paid, with a slice held for a quarter or more. Your days sales outstanding will rise the moment your commercial mix does, and it should — that is the model working as designed, not a collections failure.

What commercial customers require before you can invoice

Residential work needs a quote, the work, and an invoice. Commercial work needs a file. The usual list:

A purchase order. Most commercial customers will not pay an invoice that has no PO number on it, and the PO has to be raised before the work. Capture the number when you take the job, not when you bill it. See what is a purchase order.
A certificate of insurance, often with specific limits, additional-insured wording, and sometimes a waiver of subrogation. Your broker can issue it, but not instantly — start the day the job is awarded.
A W-9 or local tax equivalent, and your business licence and trade licences on file.
Lien waivers, conditional with each progress invoice and unconditional when paid. They are routine, and refusing to sign correctly worded ones will stall payment. See lien waivers for contractors.
Safety documentation — site orientation, sometimes a written safety program, sometimes trade-specific certifications per worker.
Prevailing wage records on public work, which are their own administrative job entirely.

None of this is billable. All of it takes time. The first commercial customer costs you far more administrative hours than the fifth, because most of that file is reusable once it exists. That learning curve is exactly why the first commercial job often loses money and the tenth one does not.

Bidding: the bid is a document, not a number

On residential work the customer is usually comparing two or three quotes and a gut feeling. Present clearly and you can win at a higher price — see how to create a professional quote.

On commercial work you are bidding to a specification. The scope is defined by somebody else, the documents are the source of truth, and your number is being compared line against line with everyone else's. That changes three things:

You read before you price. The drawings and specs contain the cost. Missing an exclusion in the specification is how a bid becomes a loss.
Your exclusions matter as much as your inclusions. Write down what is not in the number, in the bid. That paragraph is your only defence when the general contractor assumes it was included.
Win rates drop, and that is fine. Residential close rates of 50% are normal; commercial hard-bid work can win one in five or fewer. Price for the bids you win, and track the ratio so you know how much estimating time each win costs — see quote win rate for contractors and how to bid a construction job.

Scope and change orders: verbal does not exist

The most expensive habit brought from residential to commercial is the handshake extra. On a house, "while you're here, can you also…" is a two-minute conversation and a line on the final invoice. The homeowner remembers agreeing because they were the one who asked.

On a commercial site, the person who asks you for extra work often has no authority to commit money, and the person who pays never heard the conversation. No signed change order means no purchase order revision, which means an invoice that cannot be matched, which means it does not get paid.

Write the scope of work tightly, then handle every deviation as a priced, written change order before the work happens. It feels bureaucratic the first time. It is the difference between being paid for extras and donating them.

Pricing: your overhead rate is not the same on both sides

Here is where most trades lose money without noticing. They compute one overhead rate, apply one markup, and assume a commercial hour costs what a residential hour costs. It does not.

A commercial hour carries extra cost that never appears on a residential job:

Estimating time on bids you lose
Insurance endorsements and compliance paperwork
Site-specific requirements: badging, orientations, restricted working hours, escorted access
Supervision and documentation — daily reports, photos, sign-offs
Office time assembling billing packages with waivers attached
The carrying cost of 50 to 70 days of float, plus retainage

Those costs are real, and they belong in the commercial price. If your business runs both, track them separately: cost per job by customer type is the only way to see the difference. Job costing is the mechanism — see job costing for service businesses — and it only works if crew hours land on the right job in the first place.

A worked example: the same $18,000 of work, two customers

Take one crew, two weeks of work, and an $18,000 price. Direct costs are identical: $6,400 of burdened labor, $5,200 of materials, $2,900 of allocated overhead — $14,500 in all.

Residential. The invoice goes out the day the crew packs up, due on receipt, paid three days later.

Revenue $18,000, cost $14,500
Margin $3,500, or 19.4%
Cash gap after the crew is paid: about 3 days

Commercial. Same work, same crew. Add an insurance endorsement at $250, six hours of supervision and site documentation at $55 burdened ($330), and four hours of office time assembling the billing package at $40 ($160).

Revenue $18,000, cost $15,240
Margin $2,760, or 15.3%
The job finishes on the 14th, misses nothing, goes in before the 25th cutoff, is approved on day 30, and Net 30 pays around day 50
10% retainage — $1,800 — is held until the project closes, perhaps four months later

Same price, same work, four points of margin gone and roughly 47 extra days of float. Nothing here says commercial is bad. It says the commercial version of this job should have been priced at about $18,900 to hold the residential margin, and that you need the working capital to carry it. Price the difference in and commercial is a fine business. Price it like residential and you are lending money at your own expense. See how to estimate profit margin on a job for building the number properly.

Recurring maintenance agreements: the commercial prize

The reason to put up with the paperwork is not the one-off project. It is the agreement.

Commercial contractors and facility managers buy recurring maintenance because it is cheaper than emergencies and easier to budget: quarterly HVAC service, monthly landscape maintenance, scheduled inspections, planned filter and lamp replacement. For you that is revenue you can schedule months ahead, a crew you can staff with confidence, and a customer relationship that renews instead of restarting.

The economics work in both directions. Your customer gets a predictable cost and a known responder. You get the routing efficiency of planned visits, the labor certainty to hire, and the inside position on every unplanned repair on that site. The full playbook is in recurring maintenance contracts.

Two cautions. Price the agreement off your own visit costs, not off what the last contractor charged — a loss repeated monthly for three years is a bad contract, not a foot in the door. And measure profitability per agreement, not across the program, because one badly scoped site can quietly consume the margin from four good ones.

Scheduling and crews: the constraints flip

Residential scheduling is constrained by the customer. Somebody has to be home, mornings are contested, and reschedules come in the day before.

Commercial scheduling is constrained by the building. Retail work happens after close. Occupied offices mean evening or weekend hours. Active construction sites mean your crew shows up when the trade before you is actually finished, which is rarely the date on the schedule. Site access can require escorts, badges, or a two-week lead time on approvals.

That reshapes crew planning. You will need people who can work non-standard hours, a schedule that can absorb someone else's delay without stranding a crew, and honest visibility into who is committed to what — see capacity planning for field crews. Commercial work also produces more idle time you must still pay for. Time that is not on a job is still cost; if it is invisible, it lands on your margin instead of your price.

Should you take commercial work at all?

It is a working-capital question before it is a sales question. Ask three things honestly:

Can you carry 60 days of costs? Payroll, materials, fuel, and rent still go out weekly while the receivable ages. If a single Net 30 invoice with retainage would put payroll at risk, the job is too big for the balance sheet, regardless of the margin. Watch this in cash flow management for service businesses.

Can you produce the paperwork without stopping production? If the owner is the estimator, the supervisor, and the bookkeeper, commercial billing competes directly with selling and running work. Something gets dropped, and it is usually invoicing — the most expensive thing to drop.

Do you know your real cost per hour? Commercial margins are thinner and the feedback is slower. Guessing survives on residential repair work because volume covers the error. It does not survive a mispriced twelve-week commercial job.

If all three answers are yes, start with one small commercial customer, build the file once, and measure that first job to the dollar with a post-job profitability review. If any answer is no, fix that first. Residential work funded by cash today is a better business than commercial work funded by a credit line.

FAQ

Is commercial work more profitable than residential? Usually not per hour. Residential service work carries higher margins because the customer is buying convenience and trust rather than a bid price. Commercial work wins on volume, predictability, and repeat agreements. The healthiest mix for most trades is residential for cash and margin, commercial for base load.

What do general contractors require from subcontractors? Typically a purchase order or subcontract, a certificate of insurance with named additional insureds, a W-9, current licences, signed lien waivers with each payment application, and safety documentation. Assemble the package once and keep it current; most of it is reusable across customers.

Do commercial customers require a purchase order? Most do, and the PO must exist before the work. Get the number at the point of award and put it on every invoice and change order for that job. An invoice with no PO number cannot be matched, and an invoice that cannot be matched does not get paid.

What payment terms should I offer a commercial customer? Net 30 is the practical standard; Net 15 is worth asking for with smaller local accounts. Fighting a large customer's terms rarely speeds the check, so price the float instead and invoice the day the work closes. Track what actually lands with accounts receivable tracking.

How do commercial contractors set up recurring maintenance agreements? Define the visit scope and frequency, price it off your own cost per visit plus a margin, state clearly what is included and what is billed separately, and set an annual renewal with a stated escalation. Then schedule the whole year of visits at signing so the work is on the calendar rather than in someone's memory.

How much working capital do I need for commercial work? Enough to fund roughly two months of direct costs on the commercial portion, plus retainage outstanding. If commercial is 40% of a $1M business, that is roughly $80,000 to $100,000 of float at any moment. Model it before you chase the work, not after.

Can I run both residential and commercial with one crew? Yes, and most successful trades do. What you cannot do is run both on one price list, one set of terms, and one overhead rate. Separate the pricing, separate the reporting, and look at margin by customer type at least quarterly.

Why did my first commercial job lose money? Almost always three things together: unbilled administrative hours, extras done without a written change order, and a price built on residential overhead. All three are fixable, and none of them are visible without job costing on real hours.

Getting started with CRMb

Running both sides of the business means seeing them separately, and that only works if the cost data is real.

CRMb keeps the job record in one place. Crew hours punched in Punch land on the job as actual labor cost, so a commercial job's supervision and documentation hours are visible instead of absorbed. Materials pull from warehouse or truck stock at average cost. Quotes and invoices sit on the same record and go out with a public share link the customer can open without an account, and Reports show margin on real punched hours per job and per customer — which is how you find out whether your commercial work is priced correctly or quietly subsidised by your residential work. Recurring visits go on the schedule with job sites attached, and purchasing keeps supplier POs against the job they belong to.

Start a 14-day free trial at crmb.io, cost your last commercial job against your last residential one, and price the next bid from the answer.