A change order approval letter is a written document that confirms both parties have agreed to a scope change, price adjustment, or schedule modification before the extra work begins. There is no single federal statute governing private construction change orders, but most state contract law and the AIA A201 General Conditions (the dominant standard-form contract in commercial construction) require changes to the contract to be authorized in writing before work proceeds. Performing extra work without written authorization is one of the most reliable ways to get stiffed — courts routinely deny payment claims when a subcontractor cannot produce documented owner or GC approval. According to Rabbet's 2024 Construction Payments Report, 82% of contractors already face payment waits of over 30 days; undocumented change orders make that problem significantly worse.
What Is a Change Order Approval Letter and Why Does It Matter?
A change order approval letter is a formal written record that a scope change has been authorized, priced, and accepted by the party directing the work — typically the general contractor or property owner. Without it, you are performing work on a verbal handshake, and verbal agreements are nearly impossible to enforce when a dispute hits.
Here is the practical reality: if you do $8,000 in extra electrical work because a GC told you to "go ahead" in a hallway conversation, and they later deny authorizing it, your only evidence is your word against theirs. A signed letter — or even a documented email exchange — changes that dynamic entirely. Most commercial contracts include explicit "no oral modifications" clauses, which means verbal approvals are legally void regardless of what was actually said on the job site.
Beyond enforceability, written change order approval protects your mechanics lien rights. Lien laws are strict about what constitutes authorized work. If you cannot demonstrate that the scope you performed was approved, your lien claim on that work becomes vulnerable to challenge.
What Should You Include in a Change Order Approval Document?
Every change order approval letter needs seven core elements to be enforceable and useful.
1. Project identification. Full project name, address, and contract number. This eliminates ambiguity if disputes arise months later across multiple jobs.
2. Change order number. Assign sequential numbers starting at CO-001. This creates a clean audit trail and ties back to your schedule of values.
3. Description of the scope change. Be specific. "Additional conduit runs per revised electrical plan dated 03/15/2025, Sheets E-4 through E-7" is enforceable. "Extra electrical work" is not.
4. Cost breakdown. List labor hours, material costs, equipment, and your markup separately. Don't lump everything into one number — itemized breakdowns are harder to dispute and give you cover if you end up in a lien or arbitration proceeding.
5. Schedule impact. State whether the change adds days to your completion date. If it does, document the number of days and the new substantial completion date. Failure to document schedule impacts is how subs end up owing liquidated damages for delays they didn't cause.
6. Signature lines for both parties. The letter must be signed by someone with authority to approve the change. A project manager's signature may not be sufficient if the contract requires owner or GC principal approval — check your subcontract.
7. Date of approval. The approval date establishes that authorization preceded the work. This matters in disputes and in lien proceedings.
How Do You Write a Formal Change Order Approval Request?
Start with a direct subject line — "Change Order Request No. [CO-002] — [Project Name]" — and get to the point in the first sentence.
Here is a working template structure:
[Your Company Letterhead]
Date: [Date] To: [GC Name / Owner Name] Project: [Project Name and Address] Contract No.: [Your Contract Number] Change Order No.: [CO-XXX]
Subject: Change Order Approval Request — [Brief Description]
This letter constitutes a formal request for written approval of the following scope change on the above-referenced project.
Description of Change: [Specific description of work added, deleted, or modified, referencing applicable drawings or directives]
Reason for Change: [Owner-directed revision / Unforeseen condition / Architect's supplemental instruction / Design change dated XX/XX/XXXX]
Cost of Change:
| Item | Quantity | Unit Cost | Total |
|---|---|---|---|
| Labor | X hrs | $XX/hr | $XXX |
| Materials | — | — | $XXX |
| Equipment | — | — | $XXX |
| Overhead & Profit (XX%) | — | — | $XXX |
| Change Order Total | $XXX |
Schedule Impact: [X] days added to completion. New substantial completion date: [Date].
Authorization Required Before Work Commences.
By signing below, [GC/Owner Name] authorizes [Your Company Name] to proceed with the above-described scope change under the terms of the existing subcontract agreement.
Authorized Signature: _______________________ Date: _______ Printed Name & Title: _______________________
Submitted by: [Your Name, Title] [Your Company Name, Phone, Email]
Keep this to one page if possible. Decision-makers on job sites are not reading three-page memos.
Should You Send a Change Order Letter Before or After Doing the Work?
Always before. This is not a rule of thumb — it is the practical standard enforced by courts and arbitrators across the industry.
Most commercial subcontracts include language that explicitly bars payment for unauthorized extra work. The AIA A201-2017 §7.3 requires that changes to the Work be authorized by a Construction Change Directive or Change Order signed by the Owner, Architect, and Contractor. Many subcontracts flow this requirement down to subs verbatim.
If a GC or owner tells you to start the work immediately and promises to "get you the paperwork later," send the letter anyway — before you mobilize. Email it, mark it urgent, and document that you sent it. If they refuse to sign before you start, that refusal is itself a data point worth documenting. A follow-up email that says "Per our conversation on [date], you verbally directed us to proceed with [scope]. We will proceed under protest pending written confirmation" creates a contemporaneous record that can be used in a dispute.
95% of general contractors report frequently floating payments while awaiting developer disbursements, according to NetSuite's construction payment management research. You cannot afford to also float the risk of undocumented extra work on top of that cash flow pressure.
What Is the Right Email Format for Confirming an Approved Change Order?
Email works as written confirmation, but format it properly so it holds up.
Use a subject line that includes the project name and change order number: "APPROVED — Change Order CO-004, [Project Name], $3,750."
In the body, state the approval explicitly: "This email confirms that [GC Company Name] has authorized [Your Company Name] to proceed with Change Order No. CO-004 as described in our request dated [Date], in the amount of $3,750, with a [X]-day schedule extension."
Then attach the signed change order document or your original request letter. If they approved via email without signing a formal document, their written "approved, go ahead" reply to your change order request email is your documentation. Save it. Back it up somewhere that is not just your inbox.
If your project is in a state with strict lien notice requirements, make sure your change order documentation aligns with the authorized contract amount your lien is based on. In Florida, for example, a lien claim must relate to work performed under the contract — proper change order documentation directly supports the lien amount you can claim.
What Is the Change Order Approval Process for Subcontractors on Commercial Jobs?
The standard process on commercial projects runs through four steps, though your specific subcontract may add layers.
Step 1 — Identify the change and notify immediately. The moment you recognize work outside your original scope, stop and notify in writing. Don't absorb it, don't assume it's in scope, and don't wait until the end of the job to sort it out.
Step 2 — Submit a written change order request. Use the template structure above. Include your cost breakdown, schedule impact, and a clear statement that work will not commence until written authorization is received.
Step 3 — Track the approval status. If you haven't received a response within 48-72 hours, follow up in writing. Keep a change order log that tracks submission date, response date, and approval status for every change on every job.
Step 4 — Execute only after written approval. File the signed approval with your project documentation. If your GC uses a construction management platform, upload it there as well. If you're using paper, keep a copy in the job file and a backup offsite.
Missing deadlines on change order submissions can also affect your lien rights. Most states have hard deadlines for filing mechanics liens after last furnishing of labor or materials, and a disputed change order that delays your invoice cycle can push you toward those limits.
What Happens If You Skip the Written Approval and Do the Work Anyway?
You take on all the financial risk. Courts in most states apply the "no oral modification" doctrine to construction contracts — if your subcontract says changes must be in writing, a verbal approval is generally unenforceable.
There are limited equitable exceptions: some courts will apply quantum meruit (payment for the reasonable value of work performed) when a sub can prove the GC or owner knowingly accepted the benefit of the extra work. But quantum meruit claims are harder to win than contract claims, they don't always recover full markup, and litigating them costs real money.
The payment problem compounds the lien problem. Slow payments cost the U.S. construction industry an estimated $280 billion in 2024, according to Rabbet's 2024 Construction Payments Report — adding roughly 14% to total construction spending. Undocumented change orders are a direct contributor to that number, because they create disputes that stall payment on the entire contract, not just the disputed extra work.
Document every change. Every time. The five minutes it takes to send a written confirmation saves you from months of collection headaches.
Frequently Asked Questions
Does a change order approval letter need to be notarized?
No. Notarization is not required for change order approval letters in standard commercial construction. A signature from an authorized representative of the GC or owner is sufficient. What matters is that the signatory has actual authority under the contract to approve changes — verify this in your subcontract before relying on a field superintendent's signature if the contract requires principal-level approval.
Can an email serve as a valid change order approval?
Yes, in most cases. An email exchange in which the GC or owner explicitly approves the scope and price constitutes written authorization enforceable in most U.S. jurisdictions. Courts treat email as written communication. The key is that the approval must be affirmative and specific — a vague "sounds good" reply to a complex scope description may not be sufficient. Get explicit written confirmation of the dollar amount and scope.
What if the GC refuses to sign a change order before directing you to start?
Send a written protest notice documenting that you are proceeding under verbal direction and that written approval has been requested but not received. This does not guarantee payment, but it creates a contemporaneous record that work was owner- or GC-directed. Continuing to perform undirected extra work without any documentation is the highest-risk position.
How many days do you have to submit a change order request after identifying a scope change?
Your subcontract controls this. Many commercial subcontracts require change order notification within 7 to 14 days of identifying the changed condition, or the right to claim additional compensation may be waived. Read your contract and comply with the notice period — missing it is a complete defense for the GC against your change order claim.
Can a change order affect your mechanics lien rights?
Yes, directly. Your lien claim is limited to the authorized contract amount plus approved change orders. If you perform extra work that was never formally approved, you may not be able to include it in your lien. Proper change order documentation — signed approval, clear scope, agreed price — directly determines the maximum amount you can lien for.
Should every small change get a formal letter, or only large ones?
Every change should be documented, regardless of dollar amount. Small changes accumulate into large disputes. A $500 undocumented change today becomes the pattern of behavior that undermines your credibility on a $12,000 disputed change order six months later. Use a streamlined email format for small items, but always get written confirmation.
What is the difference between a Construction Change Directive and a Change Order?
A Construction Change Directive (CCD) is a unilateral owner instruction to proceed with changed work before price is agreed — used when parties cannot agree on cost. A Change Order is a bilateral agreement where both parties agree on scope and price before work proceeds. Under AIA A201-2017 §7.3, a CCD can compel you to proceed, but you retain the right to dispute the price. A signed change order waives that dispute. Know which document you're signing.
What if the change order crosses into new scope that requires updated lien notices?
If approved change orders materially expand the scope of work on a project — particularly in states with preliminary notice requirements — confirm that your existing lien notices cover the expanded work. Some states calculate lien rights from first furnishing of each trade or scope category. If you are unsure whether your current filings cover the new work, check your state-specific deadlines.
Protect Your Payment Rights on Every Change
Undocumented change orders are one of the fastest ways to lose money you've already earned. A written approval letter — even a simple email confirmation — is your first line of defense. Your second line is making sure your lien rights are locked in before problems start.
LienFlash files attorney-reviewed preliminary notices in about 2 minutes, via USPS Certified Mail, with a Certificate of Mailing PDF for your records. If you're running change orders on active jobs, your lien notice deadlines are running too.