What Is a Change Order in Construction: Your 2026 Guide
A construction change order is a formal amendment to your original contract that documents a change in the project's scope, price, or schedule. They're a normal part of construction, not a red flag, and industry guidance cited by Trimble says they affect 35% of all projects.
If you're remodeling a kitchen in Bellevue, updating an office in Seattle, or handling facility maintenance in Tacoma, this usually shows up at the exact moment something unexpected turns up. A wall opens and there's hidden moisture damage. A tenant improvement needs a different layout than the original plan. You decide you want tile instead of the flooring you first picked.
That's the moment a lot of owners get nervous. They hear “change order” and assume it means the contractor missed something, or the budget is suddenly out of control.
Most of the time, it means the opposite. It means there's a professional process in place to handle a real-world change without confusion, shortcuts, or handshake misunderstandings.
Your Project and The Unexpected Change
Let's use a familiar Puget Sound example.
You start a bath remodel in Issaquah. Demo begins. Once the wall is open, the crew finds water damage behind the surface materials that nobody could fully see from the outside. The original contract covered the agreed remodeling work, but it didn't cover repairing hidden damage that only became visible after demolition.
That's where a change order comes in. Instead of having somebody make a vague verbal promise like, “We'll sort it out later,” the contractor writes up the added work, the cost impact, and any schedule adjustment. Everyone looks at the same information. Everyone signs the same document. Then the project moves forward cleanly.
A change order isn't the problem. It's the tool that keeps the problem from turning into a dispute.
That matters because change orders are common. Trimble says they affect 35% of all construction projects, and the same guidance notes that projects over $50 million may see anywhere from 1 to 27 change orders (Trimble on construction change orders). Big jobs expect them. Smaller residential and commercial projects should have a clear process for them too.
Why clients often misunderstand them
Signing a construction contract often comes with the hope that everything will go exactly to plan. That's reasonable. But buildings don't always cooperate.
In older Tacoma and Seattle properties, crews often uncover conditions that weren't visible during estimating. In occupied commercial spaces, owners sometimes change layout priorities once they see the work in motion. Neither situation is unusual.
A contractor who explains this early tends to reduce stress later. If you're still choosing who to hire, this is one reason it helps to review how to choose a general contractor before signing anything. The process matters as much as the price.
What a Change Order Actually Is
A simple way to think about it is this. You order a truck with one set of features, then decide you want a different trim package and added accessories before delivery. The order has changed. The seller needs to update what's being built, what it costs, and when you'll get it.
Construction works the same way, just with higher stakes.
Under AIA A201, a change order is a written instrument that records an agreed change in the work, an adjustment to the Contract Sum, and an adjustment to the Contract Time (AIA fundamentals of change orders). In plain English, it's the formal paper trail that updates the deal.
What it changes
A proper change order usually addresses three things:
| Part of the project | Plain-language meaning |
|---|---|
| Scope | What work is different from the original plan |
| Price | How the contract amount changes |
| Schedule | Whether the completion date changes |
If one of those shifts, the contract should reflect it.
What it is not
Clients often confuse a change order with a few other construction documents.
- It's not the original bid. The bid is the starting agreement based on known information at that time.
- It's not a punch list. A punch list handles small finish corrections on the work already included in the contract.
- It's not casual email chatter. Emails can help document conversations, but they usually aren't a substitute for a fully executed contract amendment.
Practical rule: If the work changes, the paper should change too.
Why the formality helps both sides
Some owners worry that a formal document makes the project feel stiff or adversarial. In real life, it usually does the opposite.
A written change order protects you because it makes the contractor spell out what's being added or removed. It also protects the contractor because it confirms the work won't be treated as “included” later if it wasn't in the original agreement.
That's especially important on residential remodeling, commercial renovations, retail build-outs, and tenant improvement work where small revisions can ripple into labor scheduling, material ordering, and coordination with other trades.
If you've searched for “what is a change order in construction,” the shortest accurate answer is this: it's the signed paper that keeps everyone honest when the job changes.
Why Change Orders Happen on Washington Projects
Around Puget Sound, change orders usually come from a few predictable places. The details differ from one job to the next, but the pattern is familiar.
Owner decisions after work begins
This is the easiest one to understand.
A homeowner in Bellevue may start with one cabinet plan, then decide they want custom cabinets after seeing the room take shape. A property manager in Kirkland may approve one office space renovation layout, then ask for a different partition setup after a tenant weighs in. The contractor isn't correcting a mistake. The scope has changed.
Hidden conditions behind finished surfaces
Older homes and commercial spaces in Western Washington can become interesting.
A siding replacement in Tacoma can uncover moisture damage. A bath remodel in Seattle can expose framing repairs that nobody could verify before demolition. Waterproofing, floor repairs, drywall replacement, or structural support may suddenly move from “possible” to “necessary.”
Those aren't fun surprises, but they're common enough that experienced contractors plan for the process, even when they can't predict the exact condition in advance.
Design and documentation issues
Not every change comes from the client or the building itself. Some come from the plans.
Wightman's guidance says the national average percentage of change orders caused by architect and engineer errors or omissions is 3% to 5%, and it also notes that contract modifications increasing value by 5% to 10% are expected in most construction projects (Wightman on change orders in building projects). That's a useful reminder. A meaningful share of changes comes from documentation gaps, not from owners being indecisive.
A simple way to sort the cause
Here's a practical breakdown:
- You changed your mind. Different finish, layout, feature, or product selection.
- The site revealed something new. Hidden damage, concealed conditions, or code-related work that became visible later.
- The documents missed something. Plans, specs, or coordination details needed correction.
For commercial clients planning tenant work, it also helps to understand what a tenant improvement allowance covers. Allowances and change orders often interact, and that's where confusion starts if the paperwork isn't tight.
The Formal Change Order Process Explained
A professional process should feel boring. That's a good thing. Boring paperwork prevents expensive arguments.
The standard flow looks like this.
Step 1 through Step 3
Someone identifies a change
The owner requests a revision, the contractor finds an unforeseen condition, or the design team clarifies something that affects the work.The contractor prepares a change order request
This should describe the revised scope clearly and include cost support. Good backup might include subcontractor quotes, material pricing, labor needs, and a schedule effect.The owner reviews it and asks questions
This is the time to clear up what's included, what's not, and whether the schedule moves.
Industry guidance notes that documenting additive, deductive, and even zero-cost changes is the main defense against scope creep, because undocumented work can leave the contractor absorbing added cost or leave the owner disputing what was authorized (Document Crunch on construction change orders).
Step 4 and Step 5
After the review, the process finishes like this:
Formal approval
The parties sign the change order once they agree on the work, price, and timing.Work proceeds under the revised contract
The crew performs the new or revised scope, and the project records stay aligned.
Here's the kind of information most owners should expect to see in a clean change order request:
| Field | What it should say |
|---|---|
| Description of change | Exact work being added, removed, or revised |
| Reason for change | Owner request, hidden condition, or document issue |
| Cost detail | Labor, material, subcontractor, and related pricing support |
| Time impact | Added days, revised sequencing, or no schedule change |
| Approval line | Signature blocks for the required parties |
This short walkthrough can help if you prefer video before paperwork.
Why good contractors slow this down just enough
Owners sometimes want to skip paperwork and “just keep moving.” That instinct is understandable, especially when a job already feels disruptive.
But the minute a contractor does extra work without signed direction, everyone gets exposed. Cost gets fuzzy. Responsibility gets fuzzy. Memory becomes the record.
For teams that want a cleaner admin trail between estimate, approval, and billing, tools like FixyFlow's invoicing features can help organize estimate and invoice records around project changes. The specific software matters less than the habit of matching field decisions to written documentation.
Avoiding Disputes and Managing Project Impacts
Most change order fights don't start because the work was impossible. They start because approval was vague.
One person thought an email was enough. Another thought verbal permission in the field was enough. A third assumed pricing would get “worked out later.” That's where trust starts slipping.
Who can approve it
On many AIA-based projects, the formal change order is signed by the owner, contractor, and architect. There's also a different tool called a construction change directive, which can allow work to proceed before final agreement on price is reached, shifting risk in the process (Young Architect on change orders and directives).
That difference matters more than most clients realize.
If a fully signed change order is in place, everybody knows the revised deal. If work starts under a directive or informal instruction, the project may move faster in the moment, but the financial and legal exposure gets murkier.
Verbal approvals feel quick on Tuesday and expensive on Friday.
Practical habits that keep projects calm
If you're a homeowner in North Bend or a facility manager in West Seattle, a few habits go a long way:
- Ask for the scope in writing. Make sure the document describes exactly what changes.
- Review schedule effects. Even a small revision can alter sequencing.
- Check who has authority. Don't assume every person on site can approve added cost.
- Keep a communication trail. Emails, meeting notes, and signed documents help later.
- Read the original contract clause. The change order section tells you how the job is supposed to handle revisions.
A lot of dispute prevention comes down to communication discipline. This overview of construction communication strategies is a helpful companion if you want a broader look at how project teams avoid misunderstandings.
What owners should ask before signing
A simple three-question filter works well:
- What exactly is changing?
- What does it do to price?
- What does it do to time?
If any of those answers are foggy, pause and ask again.
For owners who like process checklists, this construction quality control checklist pairs well with change order review because both come back to the same principle: clear expectations produce cleaner results.
Your Partner for Clear and Simple Construction
A change order is just the construction industry's way of saying, “The plan changed, so the contract needs to catch up.”
That can happen because you upgraded materials, because the building revealed something hidden, or because the project documents needed adjustment. None of that has to turn into a mess. The stress usually comes from poor communication, missing signatures, or work moving ahead before everyone agrees on the terms.
For homeowners and property managers across Tacoma, Bellevue, Seattle, Kirkland, Snoqualmie, Issaquah, New Castle, West Seattle, and North Bend, the practical takeaway is simple. Don't fear the change order. Expect a clear one.
When a contractor explains the reason for the change, shows the cost backup, identifies the time impact, and gets written approval before proceeding, the project stays organized. That's true whether you're planning residential remodeling, a kitchen remodel, siding replacement, waterproofing, a retail build-out, or smaller-scale commercial construction near you.
In that kind of process, Wheeler Painting & Restoration Services handles residential and commercial construction work, including tenant improvements, repairs, and renovation projects where scope updates sometimes need formal documentation. The important part isn't flashy paperwork. It's keeping the client, the field team, and the contract aligned.
If you're planning a remodel, repair, tenant improvement, or commercial update in Tacoma, WA, Seattle, WA, Bellevue, WA, Kirkland, WA, Issaquah, WA, New Castle, WA, North Bend, WA, Snoqualmie, WA, or West Seattle, talk with Wheeler Painting & Restoration Services. A clear conversation early can make the whole project feel simpler, especially when the unexpected shows up.
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