Building projects require careful planning and clear communication. Workers must coordinate labor and order materials to keep jobs moving forward smoothly. This steady daily progress helps keep the site safe and on schedule. Yet, even the best plans face unexpected changes once construction actually begins.
Handling project changes smoothly is why understanding what is a change order in construction is vital. This guide explains how a change order updates the original contract regarding work, budget, or deadlines. It explains how these updates work, why they happen, and how to manage them.
What Is a Change Order in Construction?
A change order in construction is a formal document used to modify the original construction contract. It can add, remove, or change work, materials, specifications, costs, or the project timeline after the contract has been signed.
Change orders typically happen when the owner requests a change, unexpected site conditions are discovered, or plans need to be corrected. The document should clearly state what is changing, how it affects the price and schedule, and require approval from the relevant parties before the work proceeds.
Why Change Orders Happen in Custom Home Building
Preconstruction planning can reduce avoidable change orders by resolving scope, selections, site constraints, and design coordination before work begins. The most common triggers include:
Finish and fixture upgrades
Separating must-have features from optional upgrades before construction starts can reduce owner-driven changes later in the build. Common examples include replacing standard tile with natural stone or choosing a higher-end faucet.
Layout adjustments
A homeowner may change the layout after seeing the space take shape. This can include moving a wall, window, or door to better suit how the home will be used.
Added scope
Some features are added after the original plans are finalized. Built-ins, extra outlets, upgraded lighting, and other additions can all require a change order.
Unforeseen site conditions
Unexpected [site conditions discovered during preparation] can require changes to the original plans or scope. Common examples include unsuitable soil, a high water table, buried debris, or incorrectly mapped utility lines.
Utility or drainage adjustments
Problems with septic systems, grading, drainage, or stormwater management may become apparent during construction. Addressing these issues can require additional work and a change order.
Permit or code-driven changes
Local authorities may require changes that were not included in the original plans. These updates may be necessary to meet building codes or obtain required approvals.
Material delays or substitutions
A specified material may become unavailable or face long supplier lead times. The builder may then propose an alternative product, which can require a change order if the cost or specifications differ.
Change orders are not necessarily a red flag. They provide a formal way to document changes, costs, and schedule impacts; problems arise when those details or approvals are unclear.
What Should a Change Order Include?
A change order that actually protects both the homeowner and the builder needs more than a one-line note. At minimum, it should spell out:
| Change Order Element | Detailed Description | Why It Matters |
| What’s Changing | Specific description of added, removed, or substituted work | Prevents confusion about the new project scope |
| Why It’s Needed | The reason for the change, such as owner requests or design corrections | Explains and justifies the pivot from the original plan |
| Cost Impact | The added or reduced dollar amount for labor, materials, and markup | Keeps the project budget transparent and accurate |
| Schedule Impact | The exact number of days added to or removed from the deadline | Sets realistic expectations for the final completion date |
| Resources Involved | Detailed breakdown of the materials and labor required for the change | Provides clear context for anyone unfamiliar with the site |
| Updated Project Total | The new total contract sum after factoring in this specific change | Ensures everyone agrees on the final, current balance due |
| Signatures & Dates | Signed and dated approval from both the homeowner and the builder | Turns the paperwork into a binding contract instead of a casual note |
That last point matters more than people think. A change order sitting in an inbox, agreed to “in principle” but unsigned, isn’t worth much if a disagreement comes up later. Once both parties sign, the change order carries roughly the same weight as the original contract; it becomes part of the record, not a side conversation.
How to Do a Change Order in Construction – Step-by-Step
Step 1. Identify the change
Either the homeowner requests something different, or the builder discovers a field condition, such as bad soil, a design conflict, or a code issue that makes the original plan unworkable as drawn.
Step 2. Explain what it affects
The builder walks through what the change touches, such as materials, other trades, the schedule, and anything downstream that might be affected. A layout change on the second floor, for example, might ripple into plumbing rough-in or HVAC duct runs.
Step 3. Price it and assess the schedule impact
This is where labor, materials, equipment, and markup get calculated, along with any added or reduced days. Skipping this step or guessing the costs is a primary reason contractors lose money on extra work. They often forget the labor burden, like payroll taxes, insurance, and supervisor time, which makes the work cost more than the price charged.
Step 4. Write it down
Verbal agreements feel efficient in the moment and cause real problems three months later when memories differ. Everything goes into a written document, like a form, a template, or even a detailed email thread, as long as it captures scope, cost, and schedule.
Step 5. Both sides approve it
Signatures. Not a thumbs-up emoji in a group chat.
Step 6. The work proceeds
Only after approval. Starting work on the assumption that pricing will “obviously” be approved later is one of the fastest ways to end up in a payment dispute.
A change order is not a formality. It stops a disagreement about money from becoming a disagreement about trust.
How Change Orders Affect Cost and Timeline
A change order can increase cost, decrease cost, extend the schedule, shorten it, or occasionally do almost nothing to either. These are sometimes called “no-cost” change orders, where a material or method swap doesn’t move the price but still needs to be documented because the scope itself changed.
The cost side and markup fees
On the cost side, most contracts allow the builder to apply a markup on top of the direct cost of the changed work to cover overhead and profit. Across the industry, that markup typically lands somewhere in the 10-25% range depending on the contract structure. Change-order markup, approval procedures, and schedule extensions belong among the questions to ask your builder before construction.
Common causes for cost increases
Cost increases on a change order usually trace back to one or more of these:
- New or substituted materials
- Additional labor hours
- Rework caused by a design conflict
- Updated design details from the architect or designer
- Rescheduling subcontractors around the change
- Permit re-submittals or additional inspections
Material price volatility and escalation clauses
Rapidly changing material prices make tracking cost increases critical. Common supplies like steel, copper, and lumber often experience major price shifts between the day a builder bids a project and the day they buy materials. In fact, early 2026 reports show that some material categories jumped by more than 10% in a single year.
To prevent these sudden spikes from destroying profits, builders can include an escalation clause in their original contract. This clause allows the builder to issue a change order to cover the higher material costs rather than absorbing the loss themselves. However, this tool only works if the clause is written into the initial agreement and the price increase connects directly to an official market index instead of a vague claim that costs went up.
The schedule side and project deadlines
On the schedule side, even a change that seems minor on paper can quietly extend a completion date. If a time extension isn’t written into the change order, the builder can remain contractually bound to the original completion date. This becomes a real problem if the project ends up facing per-day penalties (liquidated damages) for finishing late through no fault of their own.
When Change Orders Become a Red Flag
A handful of well-documented change orders over the life of a custom home build is completely normal, arguably a sign the process is working the way it should. What’s not normal is a pattern of unclear, surprise, or poorly documented changes. Watch for:
- Changes that aren’t clearly explained before work starts
- Costs that only show up after the work is already done
- No written approval; just a verbal “go ahead”
- A vague original scope of work that leaves too much open to interpretation
- The same kind of detail getting missed or “forgotten” repeatedly
- Pressure to approve a change quickly, without time to review the cost or schedule impact
- Confusion over who’s actually responsible for a given change (owner request vs. builder oversight vs. design error)
One unclear change order might be a fluke. A pattern usually points to a process problem, either the original scope wasn’t detailed enough, or the change order process itself isn’t being followed consistently. Either way, it’s worth raising directly with your builder rather than letting it slide.
Final Takeaway
At its core, understanding what is a change order in construction means recognizing it as the written process for approving changes after a plan and price are locked in. In custom home building, these updates usually stem from design preferences, finish upgrades, unexpected site conditions, or requirements that appear once the crew is on-site.
Change orders are not a warning sign on their own. They become a normal, manageable part of building a home when the process is clear, documented in writing, priced honestly, and signed by both sides before work starts.
Frequently Asked Questions
Are change orders bad?
Not inherently. A well-documented change order protects both sides. The concern isn’t the change order itself; it’s an unclear, undocumented, or last-minute one.
Who approves a change order?
Typically, the homeowner (or project owner) and the builder both sign off. On larger commercial projects, an architect may also be required to sign, depending on the contract.
Can change orders delay a custom home?
Yes, if the added work affects the schedule. A properly written change order should state any added days upfront so both sides know the new expected completion date, rather than finding out after the fact.