A general contractor invoice works best when it follows a plan both sides agreed to before work began: a draw schedule tied to milestones for a remodel, or a schedule of values for commercial work. Each bill then points to finished work, signed change orders and the right lien waivers, so the owner can see what they are paying for and pay faster.
This post is for general contractors who run several jobs at once and lose evenings to billing. It covers draws, schedules of values, change orders, lien waiver paperwork and reminders, and where an AI agent drafts and a person decides. For the reminder side across all trades, see invoice and payment reminder automation.
Why do general contractor invoices fall behind?
Because the paperwork lives in five places. The contract is in one folder, change orders are in text threads, the sub's waiver is in someone's email, and the photos of finished work are on a phone in a truck. Pulling it together on billing day makes draws go out late, and late draws mean late payments.
When billing day comes, someone has to pull all of that together. On a busy month, that someone is often the owner, late at night. Draws go out late, and late draws mean late payments, which squeeze the money you owe subs and suppliers.
How should a general contractor bill a remodel in draws?
Bill each draw against a milestone the homeowner can see, not against the calendar. A draw that says "rough-in passed inspection" is easier to approve than one that says "second payment." Each draw invoice should name the milestone, show a photo or two, list new signed change orders and show what has been paid so far.
A draw schedule for a kitchen or basement remodel often looks like:
- Deposit at signing, per your contract.
- Demo and rough framing complete.
- Rough-in passed for plumbing, electrical and mechanical.
- Drywall and paint complete.
- Cabinets, counters and finish trades complete.
- Final walk and punch list closed.
Each draw invoice should name the milestone, include a photo or two, list any signed change orders added since the last draw, and show what has been paid so far. The milestones and amounts are yours to set in the contract. The invoice only follows them.
What is a general contractor schedule of values?
A general contractor schedule of values breaks a commercial job into line items, each with its own value, so each bill shows how far along each line is. The owner or their lender checks progress line by line. Each pay application shows work done this period, work done to date, any retainage and the balance left.
For example, a tenant build-out might list demolition, framing, electrical, plumbing, mechanical, drywall, ceilings, flooring, paint and general conditions as separate lines. Each pay application shows work done this period, work done to date, what is held back as retainage if your contract has it, and the balance left.
Keeping that sheet current is careful, repeat work. The SBA's guidance on AI (opens in a new tab) notes that AI can take on repeat tasks such as calendar reminders and sorting email. It is also where errors cost the most, because a wrong number on one line can stall the whole payment.
Change orders: signed first, billed second
A change order that was never signed is an argument waiting to happen. The rule most GCs live by: no extra work, and no extra billing, without a signature. The super notes the change, a person prices it, the owner signs it, and only then does it show up on the next draw or pay application.
A clean flow looks like this:
- The super or PM notes the change and the reason on site.
- A person prices it and writes the change order.
- The homeowner or owner's rep signs it, often by an online signing link.
- The signed change order joins the job file and shows up on the next draw or pay application.
Under the federal E-SIGN Act (opens in a new tab), a signature or contract generally can't be denied legal effect just because it is electronic. If the customer pushes back on a change order, a person handles that conversation. The software only keeps track of what was signed and when.
Lien waivers: paperwork people review and sign
Lien waivers move with payments: yours to the owner, and your subs' and suppliers' to you. Missing one can hold up a draw. An agent can list which waivers each draw needs, request them from subs and flag missing ones, while people review and sign every waiver.
An agent can help with the paper chase. It can list which waivers each draw needs, request them from subs, note which came back and flag which are missing before the draw goes out. People review and sign every waiver. Any question about what a waiver means, or whether to sign one, goes to a person, and to your attorney when it calls for one. In Missouri, the state's mechanic's lien notice law (opens in a new tab) requires an original contractor to give the owner a written notice that unpaid suppliers or workers can lead to a mechanic's lien on the property.
Can invoicing software for contractors draft the draws for you?
Yes, if it is set up around your contracts, your milestones and your files. Most invoicing software for contractors can make an invoice. Fewer can pull the milestone, the photos, the signed change orders and the waiver list into one draft.
We can set up the Finance Agent to draft each draw when a milestone is marked complete, attach the signed change orders and site photos, list the lien waivers that still need signatures, and send polite reminders once a person sends the bill. It is one of the six Starter Upgrades we set up first. A person reviews and approves every invoice before it goes out. For margins by job, see job costing software for contractors, and for keeping milestones on track, see general contractor scheduling software.
What stays with the GC
The GC keeps the contract, the money and every signature. You set draw amounts, retainage and change order prices, people review and sign every lien waiver, and the owner decides payment plans, late fees and disputes. Legal questions go to a person, and tax questions go to your accountant.
- Contract terms, draw amounts and retainage. You set them.
- Change order prices. A person prices and approves every one.
- Lien waivers. People review and sign. Legal questions go to a person.
- Payment plans, late fees and disputes. The owner decides.
- Tax questions. Those go to your accountant.
Same team. Same jobs. More capacity.
One draw, start to finish
This is an illustration, not a customer story.
A remodeler's basement job passes rough-in inspection on a Wednesday. The PM marks the milestone done and adds two photos. The Finance Agent drafts draw three: the milestone, the photos, one signed change order for an extra outlet run, and the total paid to date. It also notes that the electrician's waiver for the last payment has not come back, and sends the electrician a request.
The owner reads the draft Thursday morning, fixes one line and approves it. The waiver arrives that afternoon. The draw goes out with everything attached. A week later, with no payment yet, one polite reminder goes to the homeowner. They pay that weekend.
Frequently asked questions
Should every remodel use a draw schedule?
Small jobs may not need one. For jobs long enough to have clear stages, a draw schedule spreads payments out and ties each one to visible progress. Set it in the contract so nobody is surprised.
What if the homeowner disputes a draw?
A person handles it. The agent can pull the milestone photos, the signed change orders and the contract terms, so the owner has everything in one place for that conversation.
Can the agent send reminders to subs for their waivers?
Yes. It can request missing waivers before a draw goes out and note which have come back. People still review and sign every waiver. If a sub has a question about what a waiver means, the agent passes it to a person.
How do you invoice as a contractor?
Bill against the agreed draw schedule or schedule of values, list the work done this period and any signed change orders on their own lines, and show what was paid before. Attach the lien waivers your contract calls for, and send it on the same day each cycle so the client knows when to expect it.
Next step
If billing day eats your nights, book a free workflow consult. We are a Kansas City metro team, and we meet owners in person or by video. In the consult we look at how your draws, change orders and waivers move today, where they stall, and how a drafted invoice could reach your desk ready for review.
About the ScaleAlphaAi team
We are a Kansas City company that designs and builds AI agents and custom software for small businesses, trades and growing firms. We write these guides from our work with owners and office teams: what AI handles well, what stays with your people, and how to start with one workflow.
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