Construction Change Orders: What to Know

The change order is the most misused document in construction. It's supposed to be a formal written amendment that records a legitimate change to the project scope, price, or schedule. In practice, it's often a contractor's primary profit mechanism — a way to recover margin that wasn't in the original bid, charge for items the contract actually included, or exploit owner uncertainty about what "the contract said."

Understanding change orders — why they happen, which ones are legitimate, and how to contract around the predatory ones — is one of the most valuable things an owner can do before signing a construction contract.

Blank project board, rolled plans, samples, and measuring tools on a workbench — Editorial illustrationClear scope records and controlled selections create the reference point needed to evaluate a proposed change.

The Four Reasons Change Orders Happen

Not all change orders are the same. They fall into four categories, and only one of them should cost the owner money.

Category 1: Owner-Initiated Scope Changes

The owner decides to add a room, upgrade a finish, change the floor plan after framing is underway, or add a feature that wasn't in the original scope. These are legitimate changes. The owner made a decision that increases the GC's cost. The GC is entitled to charge for the additional work.

A well-run project handles these cleanly: the owner submits a change request in writing, the GC prices it within a defined turnaround period (48-72 hours is reasonable for scope additions), the owner approves or declines in writing, and — if approved — a signed change order is executed before work begins.

What this should cost: The change order should be priced at the GC's direct cost of the additional work plus the GC's markup. The markup percentage should be defined in the original contract — typically 10-15% for material, 10-20% for labor, depending on contract type. If the markup rate isn't in the original contract, you'll be negotiating it in real time when you're committed to having the work done.

Category 2: Design Errors and Omissions

The architect drew it wrong. The structural engineer missed a connection. The MEP coordination didn't account for a beam, and a duct has to be rerouted. These are errors or omissions in the design documents.

Who pays: Design errors should be resolved at no cost to the owner. The architect and engineer have a professional obligation to provide a complete, coordinated design. When their error creates additional construction cost, the cost recovery is between the GC and the design professional — not the owner.

In practice, this is murkier. GCs will sometimes claim design errors as change orders against the owner, especially when the owner has a time-sensitive project or a strong desire to avoid disputes. Owners who don't know they have a right to look to the design team for design errors end up paying for the architect's mistakes.

How to protect yourself: The original construction contract should include language specifying that GC claims arising from design errors or omissions will be presented to the architect for resolution and are not automatically the owner's cost. Retaining an Owner's Representative (OR) to review change order claims before approval is also highly effective — they recognize design error claims and push them back appropriately.

Category 3: Unforeseen Conditions

A crew excavating for footings hits bedrock six inches below the surface when the geotechnical report showed soil. A demo crew opening a wall in a gut-reno finds asbestos-containing plaster that wasn't disclosed in the hazmat survey. A concrete slab is three inches out of level across a 40-foot span, requiring additional work before finish flooring can go down.

These are genuinely unforeseen conditions — things the GC couldn't have known about from the documents and site conditions visible during bidding.

Who pays: These are legitimate additional costs. The question is who absorbs them. In a well-structured contract, a portion of the owner's contingency (see what is a GMP contract) is reserved for unforeseen conditions. On fixed-price contracts, the GC may price a contingency into their bid to cover unknowns — or the contract may explicitly state that certain unforeseen conditions are the GC's risk vs. the owner's risk.

How to protect yourself: A pre-construction site assessment — subsurface investigation, hazmat survey, structural evaluation on renovations — is the best mitigation. Identifying conditions before the contract is executed allows them to be priced rather than discovered mid-project as emergencies.

Category 4: Predatory Change Orders — "Extras" for Scope That Was Included

This is the category that costs owners the most money and generates the most disputes. A contractor claims that something is "extra scope" that wasn't in the original contract — when in fact it was clearly implied, specified, or explicitly included.

Common examples:

A framing sub claims that blocking for kitchen cabinets is an extra because "blocking isn't shown on the structural drawings" — even though it's standard scope for any framing package on a kitchen renovation
A GC claims that cleaning the jobsite at project completion is extra because "the contract didn't specify cleanup" — even though "broom-clean" conditions at substantial completion are implied in every construction contract
A GC claims that permit fees are extra because "the bid was for construction only" — even though the specification explicitly stated the GC was responsible for all permits

How to protect yourself: The two most effective tools against predatory change orders are: (1) a complete, unambiguous scope document that describes what the GC is responsible for in detail — leaving minimal room for "that wasn't in my scope" claims; and (2) a change order markup rate and approval process defined in the original contract, with a requirement that no work begins on any item before a signed change order is executed.

Inspection camera and blank notebook beside exposed wall framing and utilities — Editorial illustrationDocumenting concealed conditions before additional work proceeds gives written change authorization an objective basis.

The Most Important Contract Provision: No Work Without a Signed Change Order

The single most effective protection against change order abuse is a contract provision that states: no additional work begins without a signed change order from the owner, regardless of the GC's verbal representation that it's needed.

What this prevents: A GC says "we need to do X or the project can't proceed" and proceeds before the owner approves the cost. The owner later receives a change order for work that was already done and feels compelled to pay because the work is complete and they can't undo it. This is a deliberate tactic. The leverage disappears the moment the work is done.

With a "no work without signed change order" provision in the contract, the GC cannot bill for unauthorized scope. If they proceed without authorization, they've waived their right to compensation for that work.

Defining Markup Rates in the Original Contract

Every construction contract should define the GC's markup rate for change order work:

Labor markup: typically 15-20% above direct labor cost; some contracts specify an all-in labor rate per trade
Material markup: typically 10-15% above direct material cost
Subcontractor markup: typically 10-15% above the sub's change order cost
Overhead and profit: sometimes expressed as a single combined markup rather than separate rates

Without a defined markup rate, the GC can price change order work at whatever margin they choose. On time-sensitive projects — where the owner needs the work done quickly and doesn't have time to negotiate — a GC with undefined markup authority will charge premium rates.

Blank estimate grids, finish samples, scale ruler, and calculator on a table — Editorial illustrationItemized scope sheets and organized cost inputs support transparent pricing before changed work is approved.

What No-Surprise Change Order Contracts Look Like in Practice

JK Prestige uses fixed-price contracts for residential projects and GMP contracts for large commercial work. In both cases, the scope document produced before the contract is executed defines what's included in the contract price. If the scope doesn't change, the price doesn't change.

When an owner requests additional scope on a JK project, the process:

Owner submits request in writing (or verbally, documented immediately by JK in writing)
JK prices the addition within 48 hours and provides a written change order with the itemized cost and the markup rate (which is defined in the original contract)
Owner approves or declines in writing
Work begins only after the signed change order is executed

This process applies to every change — no informal "just add it and we'll settle up at the end" arrangements. Every scope change is documented, priced, and approved before work begins.

The JK Way covers how JK structures contracts, scope documents, and the change order process. For residential and commercial projects in Jacksonville and beyond, a JK principal answers directly — call (904) 944-0278 or submit a project inquiry.

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Frequently Asked Questions

Which change orders are actually legitimate for the owner to pay for?

Owner-initiated scope changes, like adding a room or upgrading a finish after the fact, are legitimate because the owner made a decision that increases the GC's cost. Genuinely unforeseen conditions, like hitting bedrock where the geotechnical report showed soil, are also generally the owner's cost, but design errors and omissions by the architect or engineer should be resolved at no cost to the owner, since that is a claim between the GC and the design professional.

What is a predatory change order and how do I protect myself from one?

A predatory change order is when a contractor claims something was extra scope that was actually clearly implied or included in the original contract, like billing separately for jobsite cleanup or claiming permit fees were never part of the bid. The best protection is a complete, unambiguous scope document that spells out what the GC is responsible for, combined with a markup rate and approval process defined in the original contract.

What is the single most effective contract provision against change order abuse?

A clause stating that no additional work begins without a signed change order from the owner, regardless of any verbal claim from the GC that the work is urgently needed. Without that provision, a contractor can start unauthorized work and then bill for it after the fact, counting on the fact that the work is already done and hard to undo, which is exactly the leverage this clause removes.

Construction Change Orders: Why They Happen, What They Cost, and How to Contract Around Them