Tenant improvement projects routinely blow past deadlines—sometimes by months—because contractors underestimate complexity, inspectors delay approvals, or scopes shift mid-project. Spotting unrealistic timelines before you sign helps you avoid budget overruns, lease holdover costs, and missed business launch dates. Here's how to recognize and challenge inflated schedules.
Why Contractors Rush Their Estimates
Many build-out firms quote aggressive timelines to win the job, banking on the reality that clients rarely walk away once construction starts. Others simply lack experience managing permitting, material lead times, and surprise structural issues that plague tenant improvement work. A general contractor might allocate two weeks for demolition when your space requires hazardous material abatement, or promise flooring installation without factoring in the five-week lead time for custom millwork.
The pressure to deliver quick wins is real, but a schedule that ignores practical constraints sets everyone up for failure.
Red Flags in Your Project Timeline
Unrealistic phase compression. If a contractor bundles design, permitting, and construction into eight weeks total for a 3,000-square-foot office, that's a warning. Permitting alone typically takes 4–8 weeks depending on your jurisdiction, and that assumes no plan revisions. Add another 2–4 weeks for contractor procurement and inspections.
No contingency buffer. Legitimate timelines include 10–15% contingency for permit delays, material shortages, and hidden conditions. If the schedule starts on day one with zero slack, you're at risk the moment anything deviates from the ideal path.
Missing or vague permit phases. A serious estimate specifies when permits are submitted, reviewed, resubmitted, and approved. If the schedule just says "Week 3: permitting," that contractor isn't accounting for the back-and-forth with the building department.
Oversimplified material lead times. Custom cabinetry, mechanical equipment, and specialty finishes have long procurement windows. A trustworthy timeline calls out these items explicitly and anchors the delivery date to project sequencing.
Overlapping trades without coordination details. Building in parallel—say, framing and MEP rough-in simultaneously—is smart, but only if the schedule includes buffer for inspections and punch-outs between trades. Generic phrases like "concurrent work" without inspection contingency are red flags.
What a Realistic Build-Out Timeline Looks Like
For a 2,500-square-foot commercial space with standard finishes and no hazmat:
- Pre-construction (3–5 weeks): Final design, permit package preparation, contractor procurement
- Permitting (4–8 weeks): Initial submission, plan review, resubmittal, approval
- Demolition & prep (1–2 weeks): Soft gutting, asbestos testing and remediation if needed
- Rough construction (4–6 weeks): Framing, MEP rough-in, fire-rated barriers, ductwork
- Inspections & corrections (1–2 weeks): Building department walk-throughs, punch-out work
- Finishes (3–5 weeks): Drywall, flooring, paint, cabinetry, fixtures
- Final inspection & close-out (1–2 weeks): Final sign-offs, tenant occupancy permits
Total: 18–32 weeks (4–8 months). Simple spaces might compress this; complex ones (requiring asbestos removal, structural changes, or specialized HVAC) will expand it significantly.
How to Challenge an Unrealistic Schedule
Ask your contractor or GC to provide a detailed critical path method (CPM) schedule that lists every task, duration, predecessor tasks, and key dependencies. This forces specificity and reveals gaps.
Request contingency justification. If the schedule has no buffer, ask where the 10–15% contingency sits. A contractor should explain whether it's front-loaded (early phases) or distributed throughout.
Confirm permit prerequisites. Verify that the permitting timeline aligns with your building department's typical review window. Call the AHJ (Authority Having Jurisdiction) yourself if needed—most will give you ballpark turnaround times.
Get written confirmation on long-lead items. For any material with a lead time over four weeks, ask the contractor to provide supplier quotes showing actual delivery dates.
Working with Vetted Providers
When comparing contractors and build-out firms, timeline realism is as important as price. Platforms like Mercoly let you find and compare trusted Tenant Improvement & Build-Out providers in one place, including their track records on scheduling. Use reviews and references to verify whether contractors historically finish on time—or chronically miss dates.
Frequently Asked Questions
Q: Is it normal for permit review to take 6–8 weeks? Yes, especially in urban areas or for projects requiring plan examiner reviews across multiple departments (building, fire, planning). Expedited permits sometimes trim this to 3–4 weeks, but cost extra.
Q: What's the minimum buffer I should demand in a build-out schedule? Aim for 10–15% of the total project duration; for a five-month project, that's 2–4 weeks of declared contingency for surprises.
Q: Can overlapping trades really cut weeks off a timeline? Only if coordination and inspections are scheduled explicitly. Without inspection windows between trades, you risk rework that erases any time savings.
Compare detailed timelines from multiple contractors before committing—your move-in date depends on it.