Tenant improvement (TI) pricing varies wildly depending on scope, location, and materials—but without a solid cost-per-square-foot baseline, you'll either underbid projects and kill your margins or overprice and lose deals. Knowing how to calculate TI costs accurately is essential for quoting competitively while protecting your bottom line. This guide breaks down the real factors that determine pricing and shows you how to build estimates that win business.
What Drives Tenant Improvement Costs Per Square Foot
TI work isn't one-size-fits-all. A basic office refresh with fresh paint and new flooring runs $15–$50 per square foot. Mid-range buildouts with partition walls, HVAC modifications, and updated electrical systems typically fall between $50–$150 per square foot. High-end TI with full mechanical systems, specialty finishes, and code-heavy upgrades can exceed $200 per square foot.
Geographic location is a major cost multiplier. Projects in coastal urban markets (San Francisco, New York, Boston) run 30–50% higher than Midwest or rural equivalents. Labor costs, material availability, and local code requirements all factor in.
Breaking Down Your Component Costs
Start by itemizing each cost category and measuring square footage accurately. Here's what to include:
- Demolition and prep: $2–$8/SF (gutting costs more than selective demo)
- Framing and partition walls: $4–$12/SF (drywall, studs, installation)
- Flooring: $3–$20/SF (vinyl plank, tile, carpet—finishes vary widely)
- Painting: $1–$3/SF (prep and finish quality matter)
- HVAC modifications: $5–$25/SF (ductwork rerouting and balancing add cost)
- Electrical and data: $8–$20/SF (outlet density and cable runs affect price)
- Plumbing: $5–$15/SF (if moving fixtures or adding restrooms)
- Doors, hardware, and fixtures: $4–$15/SF (quality and quantity determine range)
- Contingency and overhead: 15–20% of total hard costs
Don't estimate each line item in isolation. Material costs are interconnected—if you're doing heavy HVAC work, electrical demands may increase, which can trigger code compliance upgrades elsewhere.
The Real Calculation Method
Here's how to work backwards from a total budget or forwards from components:
- Measure accurately – Use as-built plans when available. Account for mechanical rooms, walls, and vertical spaces the tenant won't occupy but you'll need to build around.
- Identify the scope tier – Is this cosmetic (paint and flooring), systems-heavy (mechanical/electrical rework), or a full gut-and-rebuild? This determines your baseline multiplier.
- Add labor burden – Labor typically represents 40–60% of hard costs on TI work. Factor in the complexity of coordination; if multiple trades must sequence tightly, labor costs rise 10–20%.
- Account for site conditions – Existing conditions that differ from the lease plans (asbestos, old wiring, structural surprises) blow budgets fast. Build in discovery contingency: 10% for known-scope work, 15–20% for older buildings or unknown conditions.
- Compare to comps – Pull recent quotes for similar tenant builds in the same market. Your regional data is gold—it validates whether your component estimates are realistic.
Protecting Your Margin
Most TI contractors work at 25–35% overhead and profit margins when pricing competitively. If you're significantly undercutting that, your pricing model has a gap.
Itemize your proposal so clients see value in every line. A transparent $90/SF estimate—with each component visible—sells better than a lump-sum $90/SF that makes you look unreliable if costs shift.
Document scope boundaries ruthlessly. Tenant improvements almost always encounter scope creep. Define what "paint" includes (prep method, finish quality, ceilings?), what "flooring" covers (underlayment, transitions, base removal?), and what sits outside the contract. This prevents 2–5% budget erosion.
Lock in subcontractor pricing before you bid, especially for HVAC and electrical work. A 10% increase in mechanical costs can kill a tight margin on the whole project.
Getting Found and Winning More Leads
Accurate TI pricing builds your reputation, but clients need to find you first. Listing your services on Mercoly helps contractors get discovered by landlords, property managers, and tenants seeking build-out partners. A detailed profile with past project costs, timelines, and service areas positions you as the transparent, professional choice in a competitive market.
Frequently Asked Questions
Q: How much does it cost to add restrooms to an office space that doesn't have them? Adding new restrooms typically costs $50–$120 per square foot of the restroom area, depending on existing plumbing proximity and code requirements. If plumbing is far from the planned location, trenching and venting can add $3,000–$8,000 in labor and materials alone.
Q: What's the difference between a TI budget and the final invoice in typical projects? On well-scoped projects, final costs typically run 3–8% above estimate; on complex retrofits with existing structure surprises, you can see 10–20% variance. The key is a clear change order process and a realistic contingency built into your original bid.
Q: Should I charge differently for a 2,000 SF space versus a 20,000 SF space at the same per-square-foot rate? No. Larger projects often yield better per-SF pricing because mobilization, overhead allocation, and purchasing power improve. A 20,000 SF build might justify a 5–10% discount per square foot compared to a 2,000 SF one, assuming similar scope and complexity.
Start pricing your next TI project with these benchmarks in mind—and get your business discovered by the right clients on Mercoly.