A change order is any written modification to the original contract scope, price, or schedule after work has started. On the average residential remodel, homeowners see two to four change orders before the project wraps, and each one adds cost. Industry data from remodeling associations puts the average change order impact at 5% to 15% of the original contract price. Knowing how these work before you sign your first contract saves you from paying inflated rates or losing track of what you actually agreed to.
What Actually Triggers a Change Order
Most change orders fall into three categories: hidden conditions, code requirements, and owner-requested upgrades. Hidden conditions show up once demolition starts, such as water damage behind a shower wall, outdated wiring that doesn’t meet current code, or a foundation crack that wasn’t visible during the initial walkthrough. Code-driven changes happen when an inspector requires an upgrade the original scope didn’t include, like adding a GFCI outlet or upsizing an electrical panel. Owner-requested changes are the ones people expect: swapping quartz countertops for granite, adding a window, or moving a doorway six inches to fit a new appliance.
- Hidden structural or mechanical issues found during demo
- Code compliance updates required by the inspector
- Material substitutions due to availability or price changes
- Client-driven design or layout changes
- Weather delays that push labor into a different pricing period
Material substitutions have become more common since supply chains tightened. If a specified tile or fixture goes out of stock, the contractor should present two or three alternatives with price differences in writing rather than making the swap and mentioning it later.
The Paperwork That Protects Both Sides
A verbal agreement to add a task is not a change order. It is a liability. Every legitimate change order should include the same core elements, regardless of project size.
- A description of the exact work being added, removed, or modified
- An itemized cost breakdown separating labor, materials, and markup
- The revised total contract price
- Any adjustment to the completion date
- Signatures from both the homeowner and the contractor before work proceeds
Keep every change order in one folder, physical or digital, alongside the original contract. At the end of the project, this stack becomes the only reliable record of what you actually paid for versus what was in the initial bid. Contractors who resist putting changes in writing, or who say “we’ll settle up at the end,” are creating room for disputes that are hard to win without documentation.
How Scope Changes Ripple Into the Schedule
Cost is only half the story. Every change order has the potential to shift the completion date, and contractors don’t always spell this out unless asked directly. A cabinet swap that requires a four-week special order can stall the entire kitchen sequence, since countertop templating and installation usually can’t happen until cabinets are set. Ask for a revised schedule with every change order over $500, not just a revised price. If the contractor can’t tell you how a change affects the finish date, that’s a sign the impact hasn’t been thought through.
Bundle small changes when possible instead of processing them one at a time. Five separate paint color changes processed individually might each carry a small administrative fee or trip charge. Consolidating decisions into fewer change orders reduces both cost and schedule disruption.
What Fair Pricing on a Change Order Looks Like
Most contractors apply a markup of 10% to 20% on the materials and labor portion of a change order, on top of the actual cost. This covers administrative time, scheduling adjustments, and the profit margin they’re already carrying on the base contract. A markup above 25%, especially on simple substitutions, is worth questioning.
For larger changes, such as adding a bump-out or upgrading an HVAC system mid-project, ask for the same level of detail you’d expect in a full bid: unit pricing, a materials list, and labor hours. If a change order exceeds $2,000, it’s reasonable to request a second opinion or a comparison quote, even mid-project, particularly for structural or mechanical work where pricing varies widely between contractors.
- Ask for unit pricing on materials, not just a lump sum
- Compare the markup percentage to the rate stated in your original contract
- Request itemized labor hours for anything over $1,000
- Get competing quotes for major additions like structural or electrical upgrades
Signs a Contractor Is Handling Changes Poorly
Some warning signs show up early and consistently across problem projects. A contractor who starts work on a change before presenting a written cost is one of the clearest red flags, since it removes your ability to say no before the cost is already incurred. Vague line items like “miscellaneous labor, $850” without a description of the actual task are another warning sign. So is a pattern of change orders that always seem to exceed the original estimate for that phase of work, suggesting the initial bid was intentionally low to win the job.
A well-run project has change orders, but they’re infrequent, clearly justified, and processed the same way every time: a written description, a price, a schedule note, and a signature before work starts.
Before signing your next construction contract, ask the contractor directly how they document and price change orders, and request a sample from a past project. If they can’t produce one, put that answer in writing as part of your contract negotiation, specifying a markup cap and a required turnaround time for written change order approval.
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