The gap between what a landlord's TI allowance covers and what tenants actually spend has widened to $30-$80 per square foot in 2026, and somebody has to eat that number on every single lease deal. Tenant improvement cost per square foot now runs $40-$100/SF for a basic office vanilla box, $100-$200/SF for a full custom build-out, and $200-$400+/SF for medical and restaurant space — while the typical landlord allowance sits at $30-$70/SF. My shop has done TI work for 15 years, and I can tell you the profit in this niche doesn't come from the drywall. It comes from understanding, better than the tenant and often better than the broker, exactly where the allowance ends and the overage begins.
Here's the full cost breakdown by space type, how the allowance negotiation actually works, and why second-generation space is the best arbitrage in commercial construction right now.
What Tenant Improvements Cost Per Square Foot in 2026
TI pricing is a stack: the base condition of the space, the finish level the tenant wants, and the density of expensive rooms (kitchens, exam rooms, conference rooms, server closets). Here's where 2026 bids are landing.
| Build-Out Type | 2026 Cost Range ($/SF) | What You Get |
|---|---|---|
| Office vanilla box (from shell) | $40-$100 | Walls painted, drop ceiling, VCT/carpet, basic lighting, HVAC distribution, code-minimum restrooms |
| Office, mid-level custom | $100-$150 | Glass-front offices, LVT, upgraded lighting, kitchenette, some millwork |
| Office, high-end/Class A spec | $150-$200+ | Custom millwork, specialty ceilings, glass demountable partitions, AV integration |
| Retail (soft goods) | $50-$100 | Open sales floor, storefront allowance, stockroom, basic finishes |
| Restaurant (full service) | $200-$450 | Type I hood, grease interceptor, walk-ins, dining finishes, upgraded utilities |
| Medical/dental | $200-$400 | Plumbing at every exam room, lead shielding, med-gas, higher HVAC standards |
| Second-generation refresh | $20-$60 | Paint, flooring, lighting swap, minor wall moves in previously built space |
Three observations from bidding this market weekly. First, the vanilla box floor has moved: what cost $30-$35/SF in 2019 is $40-$55/SF now, driven by 25-40% increases in HVAC equipment, electrical gear, and drywall labor since 2020. Second, the spread between mid-level and high-end office has compressed — lighting and glass systems that were exotic in 2019 are commodity now. Third, anything with a hood or an exam room is its own universe; a restaurant tenant who budgets off office TI numbers is dead before the lease is signed.
The line items that move the number most
- HVAC: $8-$25/SF depending on whether you're reusing existing RTUs or adding capacity. New tonnage is the single biggest budget swing in office TI.
- Electrical: $10-$30/SF. Open-plan office with normal density sits near the bottom; medical, labs, and anything with a big IT load pushes the top.
- Millwork: $5-$40/SF spread. A reception desk and break room runs $15,000-$60,000 on its own.
- Restrooms: $15,000-$40,000 each if you're adding fixtures rather than refreshing. Plumbing that has to travel through a slab adds $5,000-$15,000 per run.
- Fire protection: $2-$5/SF for head relocations; $6-$10/SF if the space needs a new distribution loop.
Before you quote a tenant anything, run the program through our cost estimator with the space type and finish level — it'll keep your verbal ballpark from becoming a $40/SF apology later.
The TI Allowance Game: $30-$70/SF of Landlord Money and Who Eats Overages
Here's the part most contractors never learn because they only see the construction contract, not the lease: the TI allowance is not a construction budget. It's a lease-economics lever, and every dollar of it is priced into the rent.
How the allowance actually works
In 2026, competitive office landlords are offering $50-$70/SF in TI allowance on 7-10 year leases for new deals in soft markets, $30-$50/SF on 5-year deals, and $10-$25/SF on renewals. Retail landlords typically offer less — $20-$40/SF — because retail tenants bring their own brand build-out anyway. The allowance is amortized into the rent at an implied 7-9% return, which means a tenant taking an extra $20/SF of allowance on a 10-year lease is really borrowing that $20 at landlord financing rates and paying it back at roughly $2.90-$3.10/SF/year in added rent.
That math cuts both ways, and smart tenants in a soft market — and 2026 office is still soft, with national vacancy hovering near 19-20% — negotiate hard. I've watched deals this year close at $85-$100/SF in allowance for credit tenants on long terms in buildings desperate for occupancy. When a landlord has a 40%-vacant Class B tower, TI dollars are cheaper for them than another year of dark space.
Who eats the overage
The lease answers this before the first stud goes up, and there are only three structures:
- Tenant-controlled build (most common in office): Tenant hires the GC, landlord reimburses up to the allowance against draw requests. Every dollar over the allowance is the tenant's — which means when my bid comes in at $135/SF against a $60/SF allowance, the tenant is writing a check for $75/SF of real money. This is where value engineering conversations happen, and where a contractor who can show three finish tiers wins the job.
- Turnkey (landlord builds to an agreed plan): Landlord's GC builds a defined scope; overages from scope creep are negotiated, overages from market pricing are the landlord's. Tenants love the certainty; landlords pad the rent 5-10% for carrying the risk.
- Landlord work letter + tenant extras: Landlord delivers a defined condition (often the vanilla box), tenant pays for everything beyond it. The fights here are always about the definition — "code-compliant HVAC distribution" means something different to every leasing agent in America.
My contrarian advice to tenant clients: take the bigger allowance and the higher rent if you're short on cash, but never let the landlord's construction manager control your build under structure #2 without a hard scope exhibit. Every vague line in a work letter is a change order with your name on it. And for contractors — price structure #1 work knowing the tenant feels every overage dollar personally. Your markup discipline matters more here than on any other commercial work; check your numbers with the markup and margin calculator because a 10% markup is a 9.1% margin, and TI punch lists will eat 2-3 points of that if you let them.
Second-Generation vs. Shell Space: The $40-$80/SF Decision
The single biggest cost variable in any TI deal isn't finishes — it's the starting condition of the space. Tenants routinely tour a shell and a second-gen suite the same afternoon without understanding they're looking at a $40-$80/SF difference in build cost.
What shell space really costs to finish
Raw shell — concrete floors, exposed structure, no ceiling, HVAC stubbed to the space, sprinklers at the deck — needs everything. Even a modest office build in shell condition starts at $70-$90/SF because you're buying the entire ceiling plane, all distribution (air, power, data, fire protection at ceiling level), restroom construction if not in the core, and full flooring. First-generation space in new buildings almost always comes with a bigger allowance for exactly this reason, but the allowance rarely covers the full gap.
Why second-generation space is the best deal in the market
Second-gen space — a suite previously built out for another tenant — can cut TI cost 40-60% when the bones fit. Reusing existing HVAC distribution saves $8-$15/SF. Reusing the ceiling grid and lights saves $6-$12/SF. Keeping restroom and break room plumbing where it is saves $20,000-$60,000 in slab work. A tenant who accepts an existing floor plan with paint, carpet, and lighting upgrades can be in for $20-$40/SF against $100+ for the same square footage from shell.
The trap: demo isn't free ($3-$8/SF), and forcing a new program onto old bones erases the savings. If the previous tenant had 20 private offices and you want open plan, you're demoing $10/SF of walls and reworking $12/SF of HVAC zoning — suddenly second-gen costs 85% of shell. My rule of thumb from 15 years of these jobs: second-gen space saves real money when you keep at least 60% of the existing wall layout and 80% of the plumbing locations. Below that, price it as a gut and compare honestly against first-gen options.
The same logic applies across specialty spaces at bigger dollar values. A second-generation restaurant with a hood, grease interceptor, and walk-in boxes in place is worth $150-$250/SF of avoided cost — which is why restaurant spaces re-lease as restaurants for decades. We covered that math in detail in our piece on restaurant build-outs as an underrated specialty, and the medical version of the story — where plumbed exam rooms are the asset — in our dental office buildout cost breakdown. For office tenants weighing build-out against flexible space, our data on co-working build-outs averaging $125/SF is the right comp set.
Where TI Work Goes Wrong: A Contractor's Loss List
I keep a list of every TI job in my market I've heard go sideways, mine included. The patterns repeat with depressing regularity, and every one has a per-square-foot price tag.
- Building-standard requirements nobody priced. Class A buildings dictate ceiling systems, storefront hardware, even sprinkler head models. Finding out at submittal that the building requires a $9/SF ceiling instead of your $4/SF grid is a 100%-contractor-eaten overage. Read the building rules exhibit before bidding — it's usually 30 pages nobody opens.
- After-hours work rules. Occupied buildings commonly restrict demo, coring, and odor-producing work to nights and weekends. Night-shift premiums add 15-25% to affected labor. If the lease exhibit says "no core drilling during business hours" and your bid assumed day work, you just donated 3-5% of the contract.
- Freight elevator and loading dock logistics. One freight elevator shared with 40 floors adds real duration. Duration is general conditions, and GCs at $8,000-$15,000/week burn fast.
- Permit timelines. TI permits in major metros are running 4-10 weeks in 2026; anything with health department review (food service, medical) runs 8-16. Every week of pre-construction delay is rent somebody's paying on empty space — roughly $2.50-$4.00/SF/month in Class A markets — and it makes the schedule conversation adversarial before you've swung a hammer.
The common thread: TI margins die in the lease exhibits and building rules, not in the construction. The trades are the same trades. The context is what you're actually being paid to manage.
Frequently Asked Questions
What does tenant improvement cost per square foot in 2026?
Basic office vanilla box work runs $40-$100/SF, full custom office build-outs run $100-$200/SF, retail runs $50-$100/SF, and restaurant or medical space runs $200-$450/SF. Starting condition matters as much as finish level: shell space costs $40-$80/SF more to finish than comparable second-generation space.
What is a typical TI allowance from a landlord?
In 2026, $30-$70/SF is typical for office leases of 5-10 years, with credit tenants in soft markets negotiating $85-$100/SF on long terms. Retail allowances run lower, $20-$40/SF. Renewals typically get $10-$25/SF. Remember the allowance is amortized into your rent at an implied 7-9% return — it's landlord financing, not free money.
Who pays for TI costs over the allowance?
In tenant-controlled builds (the most common office structure), the tenant pays 100% of overages. In turnkey deals, the landlord absorbs market-pricing overages on the agreed scope but negotiates scope changes. The lease work letter controls — get the delivery condition defined in measurable terms before signing.
What's the difference between vanilla box and shell condition?
Shell is raw space: concrete floors, no ceiling, utilities stubbed to the premises. A vanilla box (white box) adds finished walls, ceiling, lighting, HVAC distribution, basic flooring, and code-minimum restrooms — roughly $40-$55/SF of work in 2026. Leases define these terms inconsistently, so scope exhibits beat labels every time.
Is second-generation space cheaper to build out?
Usually 40-60% cheaper, if you keep most of the existing layout. Reusing HVAC distribution, ceilings, and plumbing locations saves $30-$80/SF versus shell. The savings collapse when the floor plan changes substantially — keeping under 60% of existing walls typically means pricing the job as a gut renovation.
How long does a tenant improvement project take?
A 5,000-10,000 SF office TI typically runs 8-14 weeks of construction plus 4-10 weeks of permitting in 2026. Restaurant and medical projects run 4-8 months including health department and specialty inspections. Long-lead items — switchgear (12-20 weeks), RTUs (8-16 weeks), custom storefront — set the real schedule more often than the trades do.
Your Action Item for This Week
If you're a contractor, pull the lease work letter and building rules exhibit on your current or next TI bid and highlight every clause that costs money — after-hours restrictions, building-standard materials, freight access, insurance limits. Price each one as a line item instead of burying it in contingency; showing the tenant that itemized list is also the best sales tool in this niche. If you're a tenant, get your allowance offer in writing, then get one contractor budget on the actual space before you sign — the $2,500 pre-lease budget consultation is the cheapest insurance in commercial real estate against a $75/SF surprise.
