What's a fair markup on change orders in 2026?

Higher than your base contract markup. The base contract is competitive bid territory — change orders are not. A fair structure is 25–35% markup on materials and 30–45% on labor for residential remodel work, with a stated minimum (typically $250–$500 per change order) to cover the soft cost of writing, pricing, and tracking the change. Cost-plus contracts with a fixed fee should renegotiate the fee up on scope changes, not just pass through the cost. The reason for higher CO markup is real: change orders consume disproportionate management time, disrupt schedule, and almost always carry hidden ripple costs (the trade you already paid to come back, the sequencing rework, the inspector revisit). Bidding them at the same margin as the base scope is a money-loser.

Do I have to write a change order if it's small?

Yes, every time, in writing, signed before work starts. Verbal change orders and 'we'll true it up at the end' arrangements are how contractors lose 4–8% of contract value per remodel. Even a $200 outlet relocation should generate a one-page signed CO. The paperwork takes 5 minutes; the conversation when you bill an unsigned change at closeout takes 5 hours and frequently ends in writing it off. A standing rule that nothing happens off-contract — even a single relocated switch — saves more margin than any pricing tweak.

What should a change order document include?

At minimum: project name and contract reference, change order number (sequential), date, clear scope description (what's added, removed, or modified), reason for the change (client request, unforeseen condition, code or inspector requirement, design clarification), itemized cost (materials, labor, markup, schedule impact), new contract total after the change, schedule extension in calendar days, payment terms for the change (typically due before work proceeds or with the next progress draw), and signature lines for both client and contractor with a date. Add a line that says 'work on this change will not commence until this CO is signed and the deposit is received.' That sentence is the difference between a CO that gets paid and one that gets argued.

When should I quote a change order fixed-price vs. T&M?

Fixed-price when you can scope the work definitively in under 30 minutes of inspection. T&M with a not-to-exceed when the scope is exploratory (rot discovery, hidden plumbing, behind-wall electrical of unknown vintage). Cost-plus with a fixed markup % when the change involves trades or materials with volatile pricing (specialty hardware, lead-time-driven cabinetry, custom millwork). Never bid fixed-price on a CO where you can't see what you're touching — the margin you save by bidding it firm gets eaten by the first surprise. The contract should say upfront which CO method applies to which type of change.

How do I handle change orders triggered by unforeseen conditions versus client requests?

Both are billable, but the conversation differs. Client-driven changes (different countertop, added island, new tile pattern) are pure scope additions — bid them at full markup with no apology. Unforeseen-condition changes (rot, undersized service panel, structural surprise behind a wall) need to be communicated as 'discovered during work' and tied to the contract clause that allocates this risk to the owner. The contract should include a clause that says: 'Concealed conditions discovered during work that require additional labor, materials, or scope are billed as change orders at the rates and markup specified in this agreement.' Without that clause, a courtroom will sometimes side with the homeowner who 'thought it was included.' With that clause, you get paid.

What's the most common mistake contractors make on change orders?

Doing the work before the paper is signed. The client says 'just do it, we'll figure it out,' the contractor doesn't want to slow the job, the work happens, and now the leverage has flipped — the contractor is asking for money on work that's already done. Once a wall is closed, the homeowner's urgency is gone and yours is everything. The fix is a hard rule: no work proceeds on a change until the CO is signed and the deposit (if applicable) is received. Yes, it sometimes means the schedule slips a day. That day is far cheaper than the four points of margin you give up by chasing a payment after the fact.

Change Orders That Actually Get Paid: A Contractor's 2026 Pricing and Paperwork Playbook

Change orders are where contractors lose money on jobs that look profitable on paper. The base contract was bid carefully. The materials were sourced. The crew was sequenced. And then the homeowner asks if you can move the dishwasher three feet, the demo crew finds a knob-and-tube circuit, the inspector wants a double-tap fixed in the panel — and a 30% gross-margin job exits at 22% because the changes got done and the paperwork didn't.

Survey data from contractor associations consistently puts the hidden margin leak from undocumented or underpriced change orders at 4–8% of total contract value on residential remodels. On a $90,000 kitchen, that's $3,600 to $7,200 — typically more than the contractor's net profit on the job. Change orders aren't a paperwork annoyance. They're the single most expensive operational habit most small remodelers carry.

This guide walks the actual pricing math, the paperwork, the contract upstream, and the client conversation for change orders in 2026. The goal is simple: every billable scope change ends up signed, priced correctly, and paid — not absorbed into your margin.

Why Change Orders Bleed Money

There are four distinct ways change orders hemorrhage profit. Each requires a different fix.

1. The work happens before the paper exists. This is the dominant pattern. Client asks for something during a site visit, contractor agrees, work proceeds, paper gets written at closeout — and at closeout, the leverage has flipped completely. The client is no longer paying for an outcome they want; they're being asked to top up a number they already thought was final. The fix is upstream: a contract clause and a crew rule that says no scope change proceeds without a signed CO, full stop.

2. The CO is priced at base-contract markup. The base contract is competitive — you bid it tight against three other GCs to win the work. The CO is captive — there's no second bidder, the client wants the work done, and you're the only contractor on site. Pricing the CO at base-contract markup is leaving the captive premium on the table. Healthy CO markup runs 25–45% above your base markup, depending on whether it's labor or materials and whether it's a small or large change.

3. The schedule impact isn't priced. A five-foot wall move on a kitchen sounds like an afternoon of framing. In practice, it pushes the rough-in inspection back two days, holds the drywall crew, slides the cabinet install (which you can't reschedule because the cabinet shop's truck is booked four weeks out), and adds a return trip from the electrician. The afternoon of framing was $800 of cost. The downstream sequencing damage was $2,400. If your CO doesn't price the ripple, the ripple eats your margin.

4. The soft cost is invisible. Writing, pricing, ordering for, scheduling, supervising, and billing a change order takes 1–3 hours of office and field time even on a small change. If you don't have a CO minimum, you're losing money on small ones whether or not you mark them up well. A $250–$500 CO minimum (sometimes called a change-order administration fee) makes the small ones break even and the bigger ones genuinely profitable.

The Contract Clauses That Make COs Enforceable

Change orders work or fail based on the base contract. Three clauses do most of the work.

Clause 1: Definition and procedure

Any change in the scope of work, including additions, deletions, or modifications,
shall be authorized by a written Change Order signed by both parties. Verbal
authorizations are not valid. Work on a change shall not commence until the
Change Order is signed by Owner and any required deposit is received by Contractor.

This is the load-bearing sentence in the contract. Without it, you're arguing equity in a kitchen at 11 PM.

Clause 2: Pricing method

Change Orders shall be priced as follows: (a) Fixed price for changes where scope
can be reasonably determined; (b) Time and Materials with a stated not-to-exceed
amount for exploratory or hidden-condition work; (c) Cost plus a markup of 30%
on materials and 40% on labor where pricing volatility or lead-time risk applies.
A minimum administrative fee of $350 applies to each Change Order to cover
documentation, ordering, and supervision overhead.

State your method upfront. The hardest CO conversations are the ones where pricing method wasn't agreed to before the change came up.

Clause 3: Concealed conditions

Concealed conditions discovered during the work that materially affect cost,
schedule, or scope — including but not limited to structural deficiencies,
unforeseen utilities, environmental contaminants, code violations in existing
conditions, water damage, pest damage, or non-compliant prior work — shall be
addressed by Change Order at the rates specified above. Owner acknowledges
that concealed conditions are not part of the base contract scope.

This is the clause that separates "I bid the job wrong" (your cost) from "the wall behind the dishwasher had rot" (their cost). Without it, you'll absorb hidden conditions because the homeowner can credibly claim they thought the bid covered "everything."

For more on the contract layer that protects these clauses, see contractor proposal mistakes and contract red flags.

Change Order Pricing Math

The pricing structure that works in 2026 for most residential and light-commercial remodel work:

Materials: Cost × 1.30–1.35. Higher than base-contract material markup. The CO is a captive sale; you're the only supplier in the conversation.

Labor: Cost × 1.40–1.45. Same reasoning, plus the labor on a CO is almost always less efficient than labor on the base scope (you're inserting it into a sequenced crew schedule, not running it as a planned block).

Subcontractor work: Sub's quoted price × 1.20–1.25. You're managing the sub, scheduling them, paying them on terms, and absorbing their billing risk — that's worth 20%.

Schedule extension cost: If the change adds calendar days, multiply the days by your daily overhead burn rate (typically $200–$800/day for a small GC depending on overhead structure — see contractor overhead allocation for the math). Add this as a line item.

CO administrative minimum: $250 small-shop / $350 typical / $500 high-end shop. Floors the smallest changes.

Schedule extension days: State explicitly in calendar days (not "a few days"). Vague schedule impact is how project completion dates slide and liquidated damages clauses get triggered.

Worked Example: The Three-Foot Dishwasher Move

Mid-job, the homeowner decides the dishwasher should be on the opposite side of the sink. The base scope had it in its existing location.

Materials:

12 feet of additional ½" PEX supply: $18 × 1.30 = $23
Branch tee, shutoff, transition fittings: $42 × 1.30 = $55
Patch drywall and finish: $35 × 1.30 = $46
Subtotal materials: $124

Labor:

Plumber re-route, 2 hours @ $115/hr cost: $230 × 1.40 = $322
GC labor patch and finish drywall, 1.5 hours @ $55/hr cost: $83 × 1.40 = $116
Subtotal labor: $438

Schedule impact: 1 day delay to drywall closure → $400 daily overhead burn × 1 = $400

CO administrative minimum check: Total before admin = $962, above $350 minimum, so no floor applied.

Total CO price: $962. Original cost was $313 of materials and labor; the CO price reflects markup, ripple cost, and overhead recovery. The base-contract version of the same work (if it had been bid in originally) might have run $700 — the CO captures the captive premium plus the schedule disruption.

This is the math contractors don't run, and it's why dishwasher moves quietly cost them money.

The Three Types of CO and How to Bid Each

Client-driven changes

The homeowner wants something different. New countertop selection, larger island, accent wall, upgraded fixture. These are pure scope additions and should be priced at full CO markup with no apology. The conversation is straightforward: this is what you asked for, here's what it costs, sign here.

Bid these fixed-price wherever scope is clear. They're the highest-margin COs you'll write — captive sale, defined scope, no surprise risk.

Unforeseen-condition changes

Demo opens a wall and there's rot. The panel is undersized. The framing has a code-violating beam pocket. These are billable to the homeowner under the concealed-conditions clause, but the conversation is more delicate — the client feels like they're being charged for something they thought was included.

Bid these T&M with a not-to-exceed, especially on exploratory work where you can't yet see the full extent. The not-to-exceed protects the client from open-ended exposure; the T&M protects you from underpricing a scope you haven't fully seen.

The conversation script: "This is a concealed condition — it wasn't visible at the bid stage, and the contract addresses this with a change order. I'd rather not lock a fixed price until I can see the full extent. I'm proposing a not-to-exceed of $X with T&M billing against actual hours and materials. If the actual cost comes in below the cap, you pay actual. If it's above, we stop and reassess together."

Inspector or code-driven changes

Inspector flags an existing condition. AHJ asks for a fix that wasn't in the original scope. Code reference changed since permit pull. These are billable as change orders and usually fixed-price (the inspector defines the scope).

These are the easiest COs to sell — the homeowner has no choice, the inspector said it. Don't soft-price them out of guilt. Mark them at full CO markup like any other.

Trade-Specific Patterns

Kitchens

Most common COs: cabinet upgrades above allowance, countertop tier changes, lighting plan revisions, additional outlets, dishwasher or fridge relocation, hood upgrade, plumbing rough-in changes. Always quote cabinets and countertops as a written allowance — see the kitchen remodel pricing guide — so the upgrade conversation is "you picked above your allowance, here's the CO" instead of "wait, that's extra?"

Bathrooms

Highest CO frequency on smaller projects. Common: tile selection upgrades, niche additions, glass-door upgrades, vanity tier changes, plumbing fixture upgrades, accent wall additions. Bath COs are typically smaller-dollar but higher-count — the CO admin minimum matters more on these.

Roofs

Common COs: rotted decking discovery (concealed condition), additional flashing complexity, ventilation upgrades to meet current code, gutter changes, skylight additions or replacements during reroof. Decking surprises should be priced as $/sheet at marked-up rate, with a clear rate stated upfront.

Electrical

Common COs: panel upgrade triggered by inspector, additional circuits homeowner wants, smart-switch upgrades, EV charger circuit, outdoor receptacles. Electrical COs frequently trigger sequencing ripple — drywall has to wait for inspection — so always price the schedule impact.

Foundation and structural

These are the highest-stakes COs. Concealed conditions in foundations and structural elements can swing $5,000–$30,000 quickly. The contract concealed-conditions clause needs to be airtight, and the conversation needs to happen the day the condition is discovered, not the day the work is done.

The Workflow That Makes COs Stick

The mechanical workflow that prevents most of the leak:

CO trigger identified (client request, discovery during work, inspector callout). The crew lead's job is to stop work on that scope item until a CO exists.
Same-day site sketch and rough estimate. Even a back-of-the-envelope number gets the conversation going. Ambiguity is the enemy of CO sign-off.
CO drafted that evening or next morning. Use a template. The template should auto-number, auto-populate from the contract, and have all the fields above. Tools like ProJobCalc handle the pricing math (markup, schedule impact, admin fee) so you're not recomputing manually each time.
CO presented to client in person or via video call, not email-only. Email-only COs get ignored. A 5-minute walkthrough with the document open closes 80% of COs same-day.
Signature collected, deposit collected if applicable, before work proceeds.
CO logged in your project tracker with status (signed, in-progress, complete, billed, paid). At project close, every CO should have a billed status and a paid status.
CO totals reconciled to invoice. Each progress draw should explicitly call out CO billings versus base-contract billings — don't bury them in a single line item.

The discipline isn't complicated. It's repetitive. The contractors who get paid on every change are the ones who treat the workflow as non-negotiable, not the ones who write the most elegant COs.

The Conversation Script

The hardest CO conversations follow a predictable pattern. Here's the script for each:

Client-driven addition: "Sure, we can move that. That's a change to scope, so I'll write you a change order with the cost and a one-day schedule impact. Standard markup applies — should be in your inbox tonight, sign it back and we'll get it sequenced for [date]. The dishwasher pickup will move from Tuesday to Wednesday."

Unforeseen condition: "I want to walk you through what we found behind the wall. There's [rot/old wiring/structural issue]. This is a concealed condition under the contract — we're going to write a change order to address it. I'll have a not-to-exceed price to you by tomorrow morning. We'll need that signed before the trades come back in, otherwise the framing inspection will slip."

Inspector callout: "The inspector flagged [item]. Code requires [fix]. This is a change order. I'll have the price to you today — same markup as in the contract — and we'll need it signed in the next 24 hours so we don't lose our slot for the re-inspection."

The common thread: you're not asking permission, you're stating the next step. The CO is the standard procedure for a scope change. Treating it as standard makes it standard.

How ProJobCalc Pro Handles CO Pricing

The pricing math above is exactly the kind of thing ProJobCalc Pro was built to keep contractors honest about. It runs:

Markup math with separate rates for materials, labor, subs, and admin minimum.
Schedule impact pricing tied to your overhead burn rate.
CO templates that pull from the base-contract terms, auto-number, and include the concealed-conditions and pricing-method clauses.
Margin tracking that shows base-contract margin and CO margin separately, so you can see whether your COs are actually higher-margin (they should be) or whether you're underpricing them.

If you've been writing COs in a Google Doc and pricing them in your head, the structured workflow alone tends to recover 2–4 points of margin in the first 90 days. Combined with the upstream contract changes, the recovery on a $1.5M annual book is usually $30,000–$70,000 in net profit — most of which was already billable, just unbilled.

What to Change Tomorrow

If you do nothing else this week, do these three things:

Add the three contract clauses (procedure, pricing method, concealed conditions) to your standard agreement. Your attorney can clean up the language if needed; the structure is what matters.
Set a $250–$500 CO administrative minimum. Most contractors don't have one. The math justifies it within the first month.
Make the rule explicit with your crew: no scope change proceeds without a signed CO. The 30 seconds it takes to call you for sign-off is cheaper than the four points of margin lost on every "we'll figure it out at the end."

Change orders aren't a paperwork problem. They're a pricing and process problem with a paperwork artifact. Get the pricing right, get the process tight, and the artifact takes care of itself.