Construction Change Order Essentials

The change-order paragraph is the part of a Colorado construction contract that homeowners are most likely to ignore and most likely to regret. Almost every cost-overrun fight I take on starts the same way: somebody nodded at something on site, work got done, an invoice came in for thousands more than expected, and now nobody can agree on who said what.

Change orders are not paperwork. They are the contract — for the new work. Treat them the same way.

A change order is a written amendment, signed before the work begins

Three pieces of that sentence carry the legal weight:

• Written. Verbal change-order agreements are, in theory, enforceable in Colorado as oral modifications to a written contract. In practice, they fail constantly because the parties remember the conversation differently.

• Signed. Both parties — the homeowner and the contractor — must sign. An email saying "go ahead" is better than nothing, but a signed change-order document is what you want.

• Before the work begins. Once the work is done, your leverage is gone. Contractors know this. The most common pricing dispute I see is over change-order work that was completed before any number was agreed to.

If your original contract does not say "no change in scope, schedule, or price without a signed change order," that is a problem with the contract, not the change order. Fix the contract on the next project.

What a usable change order actually contains

A change order that holds up in a dispute has five elements. Anything less and you are gambling on the strength of the relationship.

1. A precise description of the changed work. "Upgrade kitchen tile" is not enough. "Substitute Daltile Continental Slate 12x12 in Asian Black for the previously specified Marazzi Montagna 6x24 in Sandstone, throughout the kitchen and butler's pantry per Plan A2.1" is.

2. A price, and a method of arriving at the price. Fixed-price (lump sum) is cleanest. Time-and-materials with a stated markup cap (typically 10–15% over direct cost) is acceptable. "To be determined" or "to be billed" is not a change order — it is an invitation.

3. A schedule impact. Does this change add days? Subtract days? Have no schedule impact? Say so explicitly. The most common surprise on a project that finishes late is the contractor who insists "all those changes added time" without ever documenting it at the time.

4. Reference to the original contract. "This change order modifies Contract dated [date] between [parties]." That sentence connects this document to the larger agreement and pulls in all of the original contract's terms.

5. Both signatures. Date them. Initial each page if the change order runs more than one page.

The Colorado wrinkle: permits, code, and inspections

Some changes affect things you cannot just agree to. Any modification touching structure, framing, electrical, plumbing, mechanical, or egress almost certainly needs to clear the same permit and inspection process as the original work.

A change order for that kind of work should explicitly identify:

• Which permits, if any, need to be amended or added

• Who is responsible for filing the amendment

• Whether the change requires re-engineering or a new stamped drawing

• The inspection schedule for the changed work

I have seen homeowners agree, in good faith, to a structural change that the contractor handled "informally." Two years later, when the house is being sold, the buyer's inspector finds the unpermitted work and the sale falls apart. The cost of unwinding that is enormous — and it traces back to a change order that skipped the permit conversation.

Allowance overages are change orders, not invoices

A subtle trap: many residential contracts include "allowances" for items like cabinets, tile, fixtures, and appliances. When you go over an allowance, the overage is treated by some contractors as a simple invoice. It is not. An allowance overage is a change in contract price, and it should run through the same change-order procedure as any other modification.

If your contract has $20,000 in cabinet allowance and your selections come in at $34,000, what you need is a signed change order for the $14,000 — not a line item on an invoice. The change order is the document that proves the homeowner agreed to the new number, in writing, before the cabinets were ordered.

Documenting the "I asked, you didn't answer" change

Sometimes the change is forced by a condition discovered on site — buried debris, water in the crawlspace, framing that has to be re-engineered. The contractor cannot wait two weeks for a fully papered change order; the trade is on site and the schedule cannot afford the pause.

The realistic answer is a two-step process:

• Step one: A dated, written notice from the contractor describing the condition, the proposed remedy, and a not-to-exceed dollar figure. Homeowner acknowledges in writing (text or email is acceptable here) that the contractor may proceed up to that cap.

• Step two: A fully executed change order within 5–7 days, formalizing the price and schedule impact.

The not-to-exceed number is the homeowner's protection. Without it, the contractor effectively has a blank check.

For the broader context of payment timing and how it interacts with subcontractor liens, see understanding pay-if-paid and pay-when-paid clauses.

If you are already past this point

If you are reading this with an invoice in front of you for work that was never papered, the practical question is what evidence exists. In rough order of usefulness:

• Signed change orders (the gold standard)

• Emails or texts where you acknowledged the work or the price

• Voicemails or recorded conversations (Colorado is a one-party consent state — recording your own conversation is generally legal)

• Photos with timestamps showing what was done and when

• Witnesses to the on-site conversation

The weaker the documentation, the more the dispute becomes a credibility fight. Colorado courts are not hostile to oral modifications, but they require the party asserting the change to prove it. The homeowner who carefully documented every conversation in real time almost always wins that fight. The homeowner who relied on handshakes almost always loses it.

If the project is finished and you are facing a payment dispute or a lien threat, gather every email, text, photo, and invoice you have and stop the conversation with the contractor until you have a clear picture. The next step depends entirely on what the paper trail shows, and that conversation is better had with a lawyer than across a kitchen table.

For more on the bigger picture of contract negotiation before a project starts, see our companion piece on negotiating Colorado construction contract terms.