What should an invoice explain?
You should be able to identify the project, the billing period or milestone, the amount requested and the basis for that amount. Ask the Contractor to identify any changes or allowance adjustments included so you can compare them with the supporting records.
Use the contract’s payment terms. If they refer to an inspection milestone, check the specific result and the work described in the milestone. If the request is unclear, ask a focused question before treating it as an agreed amount.
| Invoice item | Record to compare |
|---|---|
| Original-scope payment | The relevant payment milestone and work description. |
| Added or removed work | The approved Change Order and its price. |
| Allowance adjustment | The included allowance, supporting actual cost and agreed calculation. |
| Balance | Previous invoices, actual payments and any credits. |
Keep a copy of the invoice and evidence of the payment together. A payment confirmation tells you money moved; it does not explain which work it paid for unless that connection is recorded.
What makes a Change Order useful?
A useful Change Order describes the difference from the original agreement. It identifies the work being added, removed or revised, the agreed price or calculation method, the timing effect and the approval. Reference a drawing or product when that is the simplest way to describe it.
Distinguish a request for a price from permission to proceed. If you ask whether a larger window is possible, you have not necessarily agreed to its added cost or the work needed around it. Make that distinction explicit in the exchange.
Routine changes are easier to resolve before the work. If an emergency or concealed condition interrupts that sequence, document what happened and seek advice where cost or authorization is disputed.
How do you reconcile an allowance?
First check what was already included. Then compare the actual cost on exactly the basis the agreement uses. If an allowance covers material, tax and delivery, a material-only bill is not yet the whole comparison. If installation is already in the lump sum, do not count it again.
Ask for the supporting bill the contract requires. Agree that documentation arrangement before signing; an allowance is not a general right to inspect all of a fixed-price Contractor’s accounts.
Record unused amounts and returns too. Ask how credits will appear on the next invoice or final reconciliation.
What does a Preliminary Notice mean?
A Preliminary Notice identifies a party that has provided or expects to provide labor or materials and is preserving potential lien rights. CSLB distinguishes this notice from the later lien process. Save the notice and its receipt date, then ask your Contractor to identify the sender and the work involved. CSLB: How to prevent a mechanics lien
Do not pay an unfamiliar sender just because a notice arrived. First establish the contractual and payment relationships. If someone says they remain unpaid, or a lien is recorded or threatened, obtain qualified California construction-law advice promptly. Deadlines and possible responses depend on the facts.
Keep the notice alongside the relevant invoices, payments and releases. That gives you a usable record if you need advice, rather than a collection of disconnected emails.
What is the difference between a payment and a release?
Payment is the transfer of money. A waiver and release addresses lien-related rights for the claimant and work covered by that document. CSLB provides separate forms for progress and final payments, each with conditional and unconditional versions. CSLB: Conditional and unconditional releases
A conditional release depends on payment; an unconditional release states payment has been received. Read the claimant, amount, covered period and any exceptions. Paying the General Contractor or receiving its release does not establish that every subcontractor or supplier has been paid. If the chain is unclear, get help rather than inventing your own release form.
What if the numbers do not agree?
Write down the specific difference. Identify the invoice line, the agreement or approved change you are using, and the amount you believe remains unexplained. Ask for a corrected invoice or the missing support.
Avoid changing payment terms on your own or assuming that a disagreement lets you withhold any amount you choose. Preserve records and get advice about your contract and rights. This page explains document relationships; it does not decide whether a particular payment is legally due.
Questions about this topic
Is a Preliminary Notice already a lien?
No. Keep it and identify the sender rather than ignoring it or assuming it is a second bill. If the communication involves a recorded lien or a payment dispute, seek legal advice promptly.
Read more: ADU invoices, Change Orders and payment recordsLink to this answerMust I receive every supplier bill?
Do not assume that for a lump-sum contract. Specify which bills support allowances or reimbursable costs and how they must be provided. Cost-plus agreements need a clear documentation arrangement too.
Read more: How to read an ADU construction contractLink to this answerCan I keep invoices on this website?
No. PrepareToBuild.info is an information resource. Keep project financial records in the system you and your Contractor agree to use.
Read more: Construction in progressLink to this answerSources and review notes
Official references checked on . Inline links identify the source for specific statements.
Prepared for PrepareToBuild.info as an editorial draft, assisted by AI. Not yet reviewed by a licensed construction or legal professional. Practical examples are illustrative, not actual quotes, legal terms or completed projects. Confirm requirements with the responsible agency and get qualified advice about your property, contract or finances.