Tenant improvement projects can spiral into budget nightmares faster than you'd expect—a missed line item here, scope creep there, and suddenly you're 20–40% over budget. The difference between a controlled project and a financial disaster often comes down to how clearly you set expectations with your contractor before work begins. Here's how to protect yourself.
The Cost of Unclear Communication
Vague project briefs are the leading cause of budget overruns in TI work. When you say "update the break room," your contractor might picture fresh paint and new counters, while you're actually planning a full electrical rewire and HVAC upgrade. That ambiguity gets expensive.
Most contractors won't intentionally mislead you, but they will work within the scope as they interpret it. Once work starts, change orders become your only option—and those typically cost 15–30% more per line item than if the work had been included in the original bid.
Define Scope in Writing—With Images
Before requesting bids, create a detailed scope of work document that covers:
- Exact finishes and materials (paint color, flooring type, fixture brands). "Quality" countertops means nothing; "Caesarstone Statuario Nuvo, 2cm thick, edge profile A" does.
- Mechanical and electrical upgrades listed specifically (how many outlets, where, what voltage; which HVAC zones).
- Demolition boundaries (what stays, what gets stripped, what gets salvaged).
- Timeline constraints (must be complete by [date] due to lease/occupancy requirements).
- Permit responsibility (who pulls building permits and pays for inspections—typically $500–$3,000 depending on project scale).
Include photos of the existing space and sketches or marked-up floor plans showing desired changes. This eliminates the "I thought you meant..." conversation later.
Get Fixed-Price Bids, Not Time-and-Materials
Time-and-materials (T&M) contracts are open-ended by nature. The contractor bills you for labor hours (typically $60–$150/hour for skilled TI work) and materials at cost-plus markup. There's no hard cap.
Fixed-price bids force contractors to fully scope the work upfront. They'll build in contingency costs, but you know the maximum exposure. A $50,000 fixed bid on a small office TI is far more predictable than a $35,000–$65,000 T&M range.
Reality check: Get at least three fixed-price bids. If one is dramatically lower, ask why. Missing scope items? Lower-quality materials? Unrealistic timeline? Those details matter.
Build in a Contingency—But Set a Limit
Hidden conditions are unavoidable in TI work. You open a wall and find asbestos insulation, galvanized plumbing, or load-bearing studs where none were expected. Budget 5–10% contingency for genuine surprises.
The critical step: require written approval before spending contingency funds. Your contractor shouldn't touch that 10% without your sign-off. Put this in the contract. Many budget disasters happen because contractors quietly consume contingency without notification, and you don't find out until final billing.
Establish a Change Order Process
Changes will happen. Your designer finalizes the concept and wants the reception area 3 feet wider. Your tenant decides they need a second door. A permit inspector requires upgraded fire-rated drywall in a section you thought was done.
Before signing the contract, agree that:
- Any work outside the original scope requires a written change order, signed by both parties.
- The change order lists materials, labor hours, and cost before work begins.
- You have 48 hours to approve or reject the change order.
- Change orders over a certain threshold (say, $1,500) require your prior written approval.
Know Your Permit and Code Costs
Permits, inspections, and code compliance aren't optional—and they're often underestimated. In most jurisdictions, permits for TI work run $2,000–$8,000 depending on project scope and local fees. Add $500–$2,000 for third-party inspections if required.
Clarify in writing: Is the bid price inclusive of permits? Who handles code compliance issues if they arise during inspection? Budget overruns from failed inspections are avoidable if the contractor knows upfront that they're responsible for remediation at no additional cost.
Frequently Asked Questions
Q: What should I do if my contractor requests a change order halfway through the project? Stop work on that scope, review the written change order with line-item costs, approve or negotiate, then proceed. Never allow verbal change authorizations.
Q: How much should I expect to pay upfront before work starts? Standard practice is 10–25% down payment; the remainder due upon completion or in milestone payments. Avoid contractors asking for more than 50% upfront.
Q: What's a realistic timeline for a small office TI (2,000–3,000 sq ft)? Simple cosmetic work: 4–8 weeks. Moderate scope with electrical/mechanical updates: 10–16 weeks. Complex work with structural changes: 16–24 weeks, plus permit delays.
Ready to compare vetted TI contractors and lock down clear expectations? Mercoly connects you with trusted providers so you can review their approach to scope, change management, and timelines in one place.