When contractors submit change order proposals, they spend 99% of their energy calculating direct costs: journeyman labor rates, equipment rentals, fittings, and overhead markup.
Then they reach the little box at the bottom of the AIA G701 or standard change order form labeled: "The Contract Time will be increased by [ _____ ] Days."
Nine times out of ten, the project manager writes "0" or leaves it blank.
Why? Because the general contractor’s superintendent says: "Look, the owner is fine with paying the $8,500 for the extra disconnect switches, but if you ask for 5 days of schedule extension, the owner is going to freak out and send the whole change order to their corporate legal team. Leave days at zero, and we will take care of you on the back end."
Writing "0 Days Added" on a change order is the most expensive mistake a contractor can make.
Four months later, when the project finishes 22 days past the contractual Substantial Completion milestone, the owner doesn't remember any verbal promises. Instead, the owner hits the general contractor with $1,500 per day in Liquidated Damages ($33,000)—and the GC passes those delay penalties straight down to your company through back-charges.
When you argue that your crew was delayed by three separate change orders, the owner's attorney points to the three signed change orders and says: "You signed these documents certifying that each change had zero impact on the schedule. You legally waived your right to a time extension."
Below is the definitive field guide on how to calculate, substantiate, and negotiate Schedule Impact Days on every change order so you never pay liquidated damages for an owner's changes.
The Fatal Mistake: The "Accord and Satisfaction" Waiver
Under standard construction law (including AIA A201 and ConsensusDocs), an executed Change Order constitutes a legal "Accord and Satisfaction" for all matters addressed within it.
Standard change order boilerplate typically contains this exact legal trap:
"Execution of this Change Order constitutes a full and final settlement and accord and satisfaction of all claims for direct and indirect costs, delay, disruption, loss of productivity, and schedule impact resulting from or arising out of the Work described herein."
If you accept payment for labor and materials but fail to request an extension of time, you have formally certified that the extra scope caused zero delay to the project completion date. You cannot come back at final closeout and claim that those extra tasks contributed to the project running late.
Critical Path vs. Non-Critical Scope (The "Total Float" Battle)
When you submit a request for schedule days, the GC or owner will often counter: "That work didn't delay the critical path. You had float in your schedule, so you don't get any days."
To defend your time extension, you must understand the distinction:
- Critical Path Activity: A sequence of dependent tasks that directly dictates the final project completion date. If an activity on the critical path is delayed by one day, the entire project is delayed by one day.
- Non-Critical Path Activity: A task with "float" (spare time). If a task has 5 days of float and a change order delays it by 2 days, the substantial completion date does not move.
- Float Consumption / Dilution: If an owner's change consumes all of your available float, your crew is left with zero schedule buffer. Any future minor hiccup (e.g., one day of rain) immediately causes a project delay. Under modern construction law, contractors are entitled to protect their project float.
Practical Time Impact Analysis (TIA) for Small Contractors
Large commercial construction firms hire forensic scheduling consultants who charge $25,000 to run complex Time Impact Analyses (TIA) in Primavera P6. Small general contractors and trade subcontractors don't have that budget.
Here is the 4-step streamlined TIA methodology that courts, mediators, and architects accept without requiring enterprise scheduling software:
The 4-Step Simplified Time Impact Analysis
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Identify the "Unimpacted" Baseline:
Take the most recent project schedule or two-week lookahead accepted by the GC prior to the change order directive. Record the scheduled start and finish dates for the affected trade. -
Insert the "Change Fragnet" (Fragnet of Delay):
Create a mini-network of activities representing the change order:- RFI Submission & Architect Clarification Response: 5 Days
- Submittal Preparation & EOR Approval: 4 Days
- Material Fabrication & Delivery: 12 Days
- Physical Craft Demolition & Installation: 3 Days
- Municipal / Special Inspection: 2 Days
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Demonstrate the Predecessor / Successor Link:
Show what downstream work cannot proceed until the change is complete: "Drywall pre-cover inspection cannot occur until the unforeseen structural steel header and MEP rough-in are signed off." -
Calculate the Net Milestone Shift:
Subtract the baseline inspection date from the new projected inspection date. That difference is your legitimate Schedule Impact Claim.
The "Reservation of Schedule Rights" Clause
What happens when a general contractor demands an immediate price for a change order, but the manufacturer has not yet confirmed the equipment delivery lead time?
Never write "0 Days" as a placeholder. Insert this protective clause directly on the Change Order Request form:
// MANDATORY RESERVATION OF SCHEDULE RIGHTS CLAUSE
"The compensation requested herein reflects direct and known indirect costs only. Due to ongoing engineering clarifications and unconfirmed equipment procurement lead times, the exact schedule impact and ripple-effect delays cannot be fully quantified at this time.
Contractor specifically reserves the right to submit a supplemental Time Impact Analysis and request an equitable extension of the Contract Time upon final delivery of materials and completion of the affected scope."
This simple reservation clause prevents the owner from asserting "Accord and Satisfaction" if material delays push the project past the contractual completion date.
The Negotiation Script: How to Defend Days to the GC
When the general contractor pushes back on your schedule extension request during the weekly coordination meeting, use this script:
Project Manager Professional Script:
"Kevin, I understand that the owner doesn't want to see 8 calendar days added to this change order. But my crews cannot install dry-type transformers that haven't arrived from the factory yet.
If we leave schedule impact at zero days, our company is effectively guaranteeing that we will absorb an 8-day delay out of our own pocket. That exposes us to liquidated damages for a change we didn't cause. If the owner wants to keep the completion date locked, we can discuss an additive acceleration change order to authorize weekend overtime shifts. Otherwise, the contract requires the time extension to match the procurement reality."
How MyCrewTracker Automates Schedule Defense
Proving schedule delays requires connecting daily field conditions to contractual time extensions. Gaps in your daily logs destroy your defense.
MyCrewTracker gives contractors seamless schedule protection tools:
- Integrated Delay Logging in Daily Reports: Foremen record site delays, trade interference, and waiting-on-directive hours with a single tap. See our Daily Reports System.
- Automated Weather & NOAA Integration: Every daily log automatically captures certified local weather conditions (precipitation, sub-freezing temps, high winds), eliminating arguments over excusable weather delays.
- Schedule Impact Fields on Mobile Change Orders: Foremen and PMs can never accidentally leave schedule impact blank; the app prompts for calendar days or auto-inserts reservation clauses. Check our Change Orders Feature.
- Timestamped Jobsite Photo Chains: Capture photographic proof of obstructed work areas, trade stacking, and delivery staging with tamper-proof satellite timestamps. Explore Job Site Photos.
Never Pay Liquidated Damages for Owner Delays
Equip your project managers with bulletproof schedule tracking, automated weather logs, and legally protected change order workflows.
