What is the difference between a change order and a construction change directive?

A change order (e.g., AIA G701) is a bilateral agreement on scope, price, and time, signed by the parties. A construction change directive (AIA G714) is a unilateral instruction to proceed with a change before price or time is agreed; the contractor must proceed and the cost is determined afterwards under the contract’s rules.

Do change orders have to be in writing?

Virtually all US construction contracts require written authorization for changes, and many state that unauthorized work will not be paid. Courts sometimes grant recovery for verbally directed work under waiver or estoppel theories, but the evidentiary position is far weaker. Confirm every verbal direction in writing the same day.

What happens if the contractor misses a notice deadline?

Depending on the contract and jurisdiction, late notice can reduce or completely bar the claim — notice clauses are enforced strictly on much public work. Treat written notice as a same-day reflex whenever a cost- or time-impacting condition is discovered.

How are change orders priced?

By contract unit prices where applicable; otherwise by an agreed lump sum with capped overhead and profit markups; and failing agreement, by documented time and materials or cost-of-the-work plus the contractual markup. Keep changed-work costs segregated under their own cost codes regardless of method.

What documentation matters most in a change order dispute?

Contemporaneous records: the change log, written notices and directions, daily reports, dated photographs of conditions before cover-up, signed T&M tickets, and segregated cost records. Disputes are won on records made at the time, not on recollections assembled at the end of the job.

Change Order Management in Construction — Process, Pricing & Disputes

What is a change order?

A change order is a written amendment to the construction contract that modifies the scope of work, the contract sum, the contract time, or any combination of the three — signed by the parties. The owner wants to relocate a wall (scope change), add an EV charging canopy (addition), or delete the planned landscaping (deduction). On a pipe-replacement renovation it may be concealed conditions: bathrooms built differently than the record drawings showed. On sitework, rock where the geotechnical report indicated soil.

Changes are unavoidable — no set of contract documents describes reality perfectly, and owner needs evolve during construction. The problem is not that changes exist; it is that they get handled informally: verbal directions in a stairwell conversation, work performed before pricing is agreed, and reconciliation deferred to the end of the job. That is where disputes are born.

The rules live in your contract. On projects using AIA documents, the A201 General Conditions govern changes in the work; ConsensusDocs and EJCDC families have equivalent articles, and many owners use heavily amended versions. Federal work follows the FAR changes clause. The principles below are common across these frameworks — but always check the specific contract, especially its notice periods and documentation requirements.

The instruments: change orders, CCDs, and proposals

Standard US contract frameworks distinguish three instruments, and confusing them is a classic source of trouble:

Change Order — the bilateral agreement: owner, architect (on AIA projects), and contractor agree on scope, price, and time. The industry-standard form is AIA G701. Once signed, the matter is settled.
Construction Change Directive (CCD) — a unilateral instruction (AIA G714) directing the contractor to proceed with a change before price and/or time are agreed. The contractor must proceed; cost is determined later by agreed methods or by the architect subject to dispute procedures.
Change Order Proposal / PCO — the contractor’s priced proposal for a contemplated change. It is not an authorization to proceed; treat it as an offer with a stated validity period.

The practical discipline: never perform changed work on the strength of a proposal alone, and never let a verbal direction substitute for a CCD or signed change order. If an owner’s representative directs a change verbally, confirm it in writing the same day — "Confirming your direction today to proceed with X; cost and schedule proposal to follow" — and route it into the change log immediately.

Notice requirements: the most common trap

Nearly every construction contract requires the contractor to give written notice within a stated period after discovering a condition or event that will increase cost or time — concealed/differing site conditions, design conflicts, owner-caused delays. Notice periods of 7 to 21 days are typical, and many contracts state that failure to give timely notice waives the claim.

The purpose is legitimate: the owner should get the chance to investigate the condition, choose an alternative, or mitigate — before the cost is a fait accompli. Courts in many states enforce notice provisions strictly, particularly on public work; in others, late notice may be excused where the owner suffered no prejudice. Do not rely on being in the second category.

Make notice a site reflex: condition discovered in the morning, written notice to the owner the same day, entry in the daily report, and a line in the change log. The notice does not need a finished price — what matters is that it is timely, describes the condition, and states that a cost and time proposal will follow. When in doubt, give notice; a notice that turns out unnecessary costs nothing, a missing one can cost the whole claim.

Pricing change orders

Contracts typically allow change order pricing by one of three methods, roughly in this order of preference:

Unit prices — where the contract contains applicable unit prices, they govern, in both directions (additions and deletions).
Lump sum by agreement — the contractor prices the change (labor, material, equipment, subcontractor quotes) and the parties agree a fixed amount, usually with contractually capped overhead and profit markups.
Time and materials / cost of the work — absent agreement, actual documented costs plus the markup allowed by the contract. This is also the default under a CCD until pricing is resolved.

Two practical points. First, price proactively rather than sliding into time and materials — an agreed lump sum gives both parties predictability and avoids the administrative weight of daily T&M tickets and verification. Second, price the real cost: a change order rate must carry supervision, general conditions, small tools, insurance, and warranty exposure — not just bare labor. Check your contract’s markup caps (often 10–15% on self-performed work, 5–10% on subcontracted work) and structure sub-tier markups accordingly.

Do not forget time. A change that adds cost usually also consumes schedule — and a change performed "within the current duration" may still cause compensable disruption to unchanged work. Address contract time in every change order; a change order that is silent on time typically waives the extension.

Documentation: winning the paper war

Change order disputes are rarely decided on legal theory — they are decided on records. The party that can show what happened, when, who directed what, and what the work actually cost, wins. The documentation chain looks like this:

Change log: every potential change gets a sequential PCO number, description, cause, status (proposed → directed/approved → performed → billed), and value. Review the log at every OAC meeting so both parties share one picture.
Notices and directions: written notice letters, CCDs, and confirming emails filed against the PCO number.
Daily reports: crew counts, work performed, conditions encountered, and delays — contemporaneous daily reports carry great evidentiary weight; reconstructions do not.
Photographs: photograph conditions before they are covered up or excavated away. The rock in the trench, the concealed framing, the water intrusion — dated photos tied to daily reports are hard to argue with.
T&M tickets: for directed or disputed work, daily signed tickets for labor, equipment, and materials — signed by the owner’s representative "for record only" if liability is contested.
Cost segregation: track changed work under separate cost codes from base contract work. Commingled costs are the fastest way to lose an otherwise good claim.

The most common disputes — and how to avoid them

Late or missing notice

The contractor solves the problem in the field and raises money afterwards; the owner invokes the notice clause. Avoided by the same-day written notice reflex.

Verbal directions

The owner’s site representative says "go ahead and handle it"; at final accounting nobody remembers it the same way. Avoided by same-day written confirmation and by knowing who holds actual authority to direct changes — the person walking the site often does not.

Scope boundary fights

Is the work a change, or was it always in the contractor’s scope? Especially common under design-build and performance specifications, where the contractor’s scope obligation is broad. Best fought at bid time: clear scope letters, documented clarifications and assumptions, and a disciplined exhibit structure in the subcontracts.

The end-of-job megaclaim

A hundred unresolved PCOs meet an exhausted owner at substantial completion — a recipe for lump-sum haircuts and a sour closeout. Avoided by resolving changes in rhythm: propose, authorize, perform, bill — in that order, change by change, throughout the job.

A working change order process, step by step

Identify: a condition is discovered or the owner requests a change. Open a numbered PCO in the change log immediately.
Notify: written notice to the owner within the contract’s notice period — same day as a habit — describing the condition and reserving cost and time rights.
Propose: priced proposal with cost breakdown and schedule impact, with a stated validity period.
Await authorization: signed change order or CCD before starting the work — except genuine emergencies, which get documented twice as carefully.
Perform and document: daily reports, photos, T&M tickets where applicable, separate cost codes.
Bill promptly: include approved changes in the next pay application — do not park them until final billing.
Reconcile: walk the change log at every OAC meeting until every item is closed.
Feed back: analyze change order causes at close-out — they are prime material for your lessons-learned process and for better contract documents next time.

Change order management in construction: the complete guide