What Is Tenant Improvement?, Complete Guide for Landlords and Tenants
You're deep into negotiating a commercial lease, and the broker or landlord keeps saying "TI" and "TI allowance" like it's obvious. You're nodding along, doing the mental math on rent per square foot, but somewhere underneath that nodding is a real question: what exactly is a tenant improvement, and why does it seem to matter so much to how this deal gets structured?
It's a foundational concept in commercial real estate, and once it clicks, a lot of the rest of a commercial lease negotiation starts making a lot more sense. Tenant improvement, TI, for short, is one of those terms that gets used constantly by people already in the industry and rarely explained to people just entering it. This is the explanation.
Here's the short version: tenant improvement (TI) is the work done to customize a commercial space for a specific tenant's use, new walls, updated electrical and plumbing, finishes, layout changes, whatever it takes to turn a generic space into a functioning restaurant, office, retail store, or medical practice. Who pays for it varies by deal, sometimes the landlord provides a TI allowance, sometimes the tenant covers it themselves, sometimes it's split. The typical sequence runs from lease negotiation through design, permitting, construction, and finally occupancy. And here's the detail that surprises a lot of first-time tenants: whatever gets built generally stays with the building when the lease ends, unless the lease specifically requires you to remove it. Here's how the whole thing actually works.
The Simple Definition
Tenant improvement is the work done to customize commercial space for a specific tenant's use, the difference between a generic shell and a space that actually functions for whatever business is moving in.
A straightforward example: an empty retail shell, concrete floor, exterior walls, no interior partitions, minimal utilities, becomes a functioning restaurant. Everything added to make that happen (kitchen, counters, restrooms, plumbing, electrical, walls, flooring) is the tenant improvement.
Another example: an existing office space with dated cubicles and a closed-off layout becomes home to a tech startup that wants an open, collaborative floor plan. Removing the old cubicles, adding glass partition walls, upgrading electrical capacity, installing new flooring and modern finishes, all of that is TI.
One more: a medical suite vacated by a retiring doctor gets reconfigured for an incoming dental practice, modified treatment rooms, additional plumbing stations, updated electrical, new equipment connections. Same concept, different business.
The core insight underneath all of this: every business has different space needs, and commercial spaces are essentially adaptable canvases that get customized for whoever's occupying them next. TI is that customization work.
What TI is not: major structural work to the building itself (that's typically the landlord's responsibility, not the tenant's), ongoing maintenance of building systems like HVAC or roofing (also landlord territory), routine cleaning (a tenant responsibility, but not TI), and furniture or equipment that leaves with the tenant when they move out, TI specifically refers to permanent improvements to the space itself.
Terminology worth knowing, since it varies by context: TI (tenant improvement) is the most common term. LI (leasehold improvement) is the accounting and finance term for the same concept. Build-out is common construction-industry shorthand for the same thing. Fit-out is the UK and international equivalent. TIA (tenant improvement allowance) refers specifically to the money a landlord contributes toward TI costs. Different rooms use different words for the same underlying idea.
Who Pays for Tenant Improvement?
There's no universal answer here, it comes down entirely to how the specific lease is negotiated. It can be the landlord, the tenant, or some split between the two, and understanding the common structures helps you know what you're actually negotiating.
Landlord pays via a TI allowance. The lease specifies an allowance amount, often expressed as dollars per square foot, and the landlord reimburses the tenant for TI costs up to that amount, with the tenant covering anything beyond it. For example: a 5,000 sq ft space with a $30/sq ft allowance gives the tenant $150,000 toward TI costs. If the actual work costs $200,000, the tenant covers the remaining $50,000 out of pocket.
Tenant pays directly. The tenant designs and funds the improvements themselves, sometimes with the landlord retaining design approval rights but no funding obligation. This is more common with smaller landlords, shorter leases, or tenants with very specific, unusual space requirements. The risk here is straightforward: the tenant is investing real money into a property they don't own.
Turnkey build-out. The landlord builds the space to the tenant's specifications and covers the full cost, typically baked into the overall lease economics rather than itemized separately. This is more common with larger, institutional landlords and longer-term leases, where the tenant essentially hands over a spec and moves into a finished space.
As-is with a rent credit. The tenant takes the space in its current condition, but receives a rent discount or rent-free period in exchange, then uses those savings to fund their own improvements. This suits tenants who want full control over the build-out and landlords who'd rather not manage construction themselves.
TI allowances are genuinely negotiable, like most terms in a commercial lease. Market conditions matter here too: in a softer leasing market, landlords tend to offer more generous TI allowances to attract and keep tenants; in a tight market, that leverage shifts.
Typical TI allowance ranges by space type:
| Space Type | Typical TI Allowance |
|---|---|
| Office | $30–$80/sq ft |
| Retail | $20–$60/sq ft |
| Restaurant | $50–$150/sq ft (reflecting complex kitchen and utility systems) |
| Medical | $60–$120/sq ft (reflecting specialized requirements) |
| Industrial/warehouse | $5–$30/sq ft (generally simpler build-outs) |
What it typically doesn't cover: furniture and equipment that move with the tenant, signage (sometimes, depending on the specific lease), technology and IT infrastructure (sometimes), moving costs, and general business setup expenses unrelated to the physical space.
The TI Process, Step by Step
Lease negotiation. TI terms get worked out as part of the broader lease, the allowance amount (if any), who manages construction, timeline requirements (an opening deadline, for instance), the design approval process, who handles permitting, and whether the tenant needs to restore the space at lease end. This phase alone can take weeks to months.
Design and planning. Once the lease is signed, the tenant (or landlord, in a turnkey arrangement) hires an architect or drafter, assesses the space's needs, and develops the actual design, floor plan, systems, finishes. This typically takes four to eight weeks.
Landlord approval. Most leases require the landlord to sign off on TI designs before anything moves forward, generally to protect building integrity and confirm code compliance from their end too. This step typically takes one to three weeks.
Permitting. TI work almost always requires permits. Drawings go to the city building department, get reviewed for code compliance, and either get approved or sent back with corrections. Construction can't legally begin until the permit is issued. This phase typically runs two to six weeks.
Construction. A general contractor builds the improvements according to the approved drawings, with inspections happening along the way and a final inspection at completion. Timeline varies significantly by scope, typically four to twelve weeks.
Occupancy. Once construction wraps, a final city inspection leads to a certificate of occupancy, at which point the tenant can actually move in and open. This final step usually takes one to two weeks.
Reimbursement, where a TI allowance applies. The tenant submits invoices and documentation for the completed work, the landlord reviews and approves it, and reimbursement follows, typically two to four weeks after project completion, with the tenant covering anything beyond the negotiated allowance.
Overall timeline, lease signing to opening for business: typically four to nine months for a straightforward project, and six to twelve months or more for something more complex.
Types of Tenant Improvement
| Type | Starting Condition | TI Scope | Typical Cost | Common Setting |
|---|---|---|---|---|
| Cold shell | Raw space, exterior walls, roof, slab floor, maybe basic electrical | Nearly everything: walls, plumbing, HVAC, ceilings, flooring | $80–$200/sq ft | New developments, retail centers, industrial conversions |
| Warm shell | Partially improved, basic HVAC, electrical panel, basic restrooms | Layout, finishes, specific systems | $50–$120/sq ft | Suburban office buildings, some retail |
| Second-generation | Previously occupied, prior tenant's walls, systems, and finishes still in place | Modifying what's there rather than starting fresh | $30–$80/sq ft, depending on how much changes | Most commercial leases, the space has history |
| Cosmetic renovation | Functional space with outdated finishes | Flooring, paint, lighting, minor layout tweaks | $20–$50/sq ft | Simple rebrand or light refresh |
| Change of use | Space previously used for an entirely different purpose | Major renovation plus systems changes; requires a change-of-use permit | $100–$250/sq ft | Creative reuse, retail to restaurant, warehouse to office |
Who's Involved in a TI Project
The tenant defines the actual business needs, layout, systems, requirements, typically hires the design team, manages their portion of the budget, and coordinates with the landlord throughout. Their goal: a functional space, on time and on budget.
The landlord may provide a TI allowance, generally holds design approval rights to protect building integrity, sometimes manages construction directly (in turnkey arrangements), and ensures overall permit compliance. Their goal: a long-term tenant and a protected property.
The architect or drafter assesses existing conditions, designs to the tenant's actual needs, prepares the drawings required for permitting, ensures code compliance, and supports the process through plan check. Their goal: an approved design that gets built correctly.
The general contractor executes construction according to the approved drawings, hires and coordinates subcontractors, manages timeline and budget, and coordinates inspections. Their goal: delivering the finished space on time, on budget, and per plan.
The city building department reviews drawings for code compliance, issues permits, conducts inspections, and ultimately issues the certificate of occupancy. Their role is purely regulatory oversight, ensuring the finished work is safe and compliant.
Subcontractors, electricians, plumbers, HVAC installers, fire protection specialists, install their specific systems according to the drawings, coordinating with the general contractor throughout.
TI Allowance: The Financial Mechanics
How an allowance gets structured:
- A flat amount, a simple, fixed number like "$150,000 TI allowance," common for smaller spaces and more straightforward leases. - A per-square-foot rate, "$40/sq ft," which scales naturally with the size of the space (a 3,000 sq ft lease at $40/sq ft works out to $120,000), common in larger leases and with institutional landlords. - A phased allowance, funds released in stages, for instance half at construction start and half at completion, which gives the landlord some protection against a project that stalls partway through.
How reimbursement typically works: the tenant covers TI costs upfront, keeps all invoices and receipts, submits documentation to the landlord, the landlord reviews it (sometimes requiring lien waivers from contractors as part of that review), and reimburses up to the agreed allowance, with any amount beyond that remaining the tenant's responsibility.
Common issues worth planning around:
- The allowance doesn't cover the full cost. Get real contractor estimates before finalizing the lease, not after, so the allowance you negotiate is grounded in an actual number rather than a guess. - The allowance has an expiration. Most leases require the TI allowance to be used within a specific window after lease signing, miss that window, and the unused portion is simply gone. Starting design work immediately after signing helps protect against this. - Landlord approval delays eat into the timeline. Negotiating a specific approval turnaround window into the lease itself (commonly 10–14 days) helps keep this from becoming an open-ended bottleneck. - Over-improving relative to the lease term. Since improvements generally stay with the building, sinking a large TI investment into a short lease term is a real risk worth weighing carefully against how long you'll actually occupy the space.
On tax treatment: from the tenant's side, TI is generally treated as a leasehold improvement, amortized over the lease term rather than expensed immediately. From the landlord's side, it's generally treated as a depreciable building improvement. This is genuinely an area worth a real conversation with your accountant rather than assuming, the general rule is that TI functions as a capital investment rather than an immediate expense, but the specifics matter for your particular situation.
TI and Lease Terms
Lease length and TI allowance tend to move together. The logic from the landlord's side: a longer lease gives them more time to recover the TI investment through rent, so longer commitments generally command higher allowances. A five-year lease might see a $20–$40/sq ft allowance, a ten-year lease $40–$80/sq ft, and a fifteen-year lease $80–$120/sq ft or more.
TI is one piece of a larger negotiated package. TI allowance, base rent, and any free-rent period all get negotiated together, often as trade-offs against each other, a landlord might offer a higher TI allowance paired with a higher rent rate, or a lower allowance with lower rent. Which combination makes sense depends on the tenant's specific priorities and cash position.
Rent abatement (free rent) is frequently bundled alongside a TI allowance, covering the period during construction when the tenant can't yet operate, typically one to three months of rent-free time to cover the build-out period.
Restoration clauses can require the tenant to remove TI work and return the space to its original condition at lease end. This is genuinely worth negotiating specifically, some landlords want certain improvements to stay (since they add value for the next tenant), while others want a clean slate. Knowing which improvements you'd be on the hook to remove changes the real cost calculation of your build-out.
The right to make improvements at all needs to be explicitly granted in the lease, without it, a tenant can't legally proceed with TI work. This is standard in most commercial leases, but worth confirming rather than assuming.
Landlord approval rights are standard as well, typically with a "reasonable approval" standard, meaning the landlord can't withhold approval arbitrarily, paired with a negotiated timeline (commonly 10–14 days) for how quickly that approval needs to happen.
Common TI Mistakes
Not budgeting accurately upfront. A common and expensive surprise, "I thought $50,000 would cover it, and it ended up costing $120,000." The fix: get real contractor bids before finalizing your lease terms, not after.
Not starting design early enough. Design and permitting both take real time, and starting late pushes back your opening date and delays revenue. Begin the design process immediately once the lease is signed, not weeks later.
Not negotiating the TI allowance properly. Accepting a landlord's first offer without realizing it's negotiable is a common and avoidable mistake, nearly everything in a commercial lease, TI allowance included, is open to negotiation.
Skipping professional drawings to save money. Cutting corners here routinely leads to permit rejections, contractor confusion, and downstream delays that cost far more than the drafting fee saved. Professional TI drawings are worth the investment.
Choosing a contractor purely on price. The cheapest bid isn't always the best value, get multiple bids, check references, and weigh experience alongside cost rather than defaulting to the lowest number.
Starting construction without permits. This risks a stop-work order, fines, and potentially having to redo completed work, never begin construction before the permit is actually issued.
Over-improving relative to a short lease term. Since TI generally stays with the building, sinking a large investment into a short-term lease is a real financial risk worth weighing carefully.
Not reading the restoration clause carefully. Discovering at lease end that you're required to remove improvements you invested heavily in is an expensive surprise, negotiate this clause with real attention rather than treating it as boilerplate.
TI for Different Business Types
Restaurant/food service: requires a commercial kitchen, hood ventilation system, grease trap, and extensive plumbing and gas work. Complexity is very high, cost typically runs $100–$250/sq ft, and the key challenges are health code compliance, utility connections, and ventilation, this is a category where detailed, MEP-coordinated drawings genuinely matter most.
Retail: needs display areas, storefront design, checkout areas, and standard utilities. Moderate complexity, typically $40–$100/sq ft, with customer flow and storefront aesthetics as the key design challenges alongside the practical utility work.
Office/professional: requires layout planning, partitions, conference rooms, and technology infrastructure. Moderate complexity, typically $40–$80/sq ft, balancing privacy and collaboration needs alongside lighting and HVAC zoning.
Medical/dental: requires exam and treatment rooms, a waiting area, and multiple plumbing stations. High complexity, typically $80–$150/sq ft, with infection control, ADA compliance, and specialized utility planning as the central challenges.
Fitness/gym: needs workout areas, locker rooms, showers, and equipment connections. Moderate-to-high complexity, typically $50–$120/sq ft, with moisture control, equipment weight (a real structural consideration), and HVAC capacity as key concerns.
Child care: requires classrooms, outdoor access, enhanced safety features, and accessible bathrooms. Moderate complexity, typically $60–$100/sq ft, with safety code compliance and child-specific design as the defining considerations.
What Makes TI Different From Other Construction
TI vs. new construction: new construction builds from scratch, foundation, structure, everything. TI works within an existing building's constraints. That makes TI generally faster and cheaper, but genuinely limited by what the existing structure allows, you can't casually move a load-bearing column or wall the way you might redesign from a blank slate.
TI vs. residential renovation: these are not interchangeable, despite surface similarities. Commercial spaces operate under different, generally stricter codes, ADA compliance, occupancy limits, fire and egress requirements, and require commercial-licensed contractors and drafters with genuine commercial experience. A residential drafter's experience doesn't automatically transfer to commercial TI work.
TI vs. capital improvement: a capital improvement is the landlord improving the building itself, a new roof, upgraded common areas. TI is the tenant customizing their specific leased space. Funding responsibility differs (landlord for capital improvements, negotiated for TI), though both ultimately benefit landlord and tenant in different ways.
TI generally stays with the building. When a lease ends, the tenant leaves, but the physical improvements typically remain part of the property, unless a restoration clause specifically requires their removal. This is part of why TI allowances make financial sense from the landlord's side: they're investing in an asset that stays with their property long after any one tenant moves out.
Planning Your TI Project
Before signing the lease: get a clear understanding of the space's actual condition (cold shell, warm shell, second-generation), get a rough contractor estimate for what your specific build-out will cost, and use that number to negotiate a realistic TI allowance, restoration clause, approval timeline, and any rent-free construction period.
Immediately after signing: hire your architect or drafter, document existing conditions before anything changes, define your specific space needs precisely, and begin the design process right away rather than waiting.
During design: review designs with the landlord for approval, get that sign-off before moving to permits, finalize your contractor selection, and confirm your budget against real numbers.
During permitting: submit drawings to the city, track the review status actively, respond quickly to any correction requests, and never start construction before the permit is actually issued.
During construction: manage your contractor and timeline closely, document every cost carefully (essential for allowance reimbursement), coordinate inspections as they come up, and stay on schedule as much as possible.
At completion: get through final inspections, obtain your certificate of occupancy, submit documented TI costs to the landlord for reimbursement if an allowance applies, get as-built drawings of the finished space, and move in and open.
Common Questions About Tenant Improvement
What is a tenant improvement? Work done to customize a commercial space for a specific tenant's use, new layout, systems, finishes, whatever's needed to make a generic space functional for that particular business.
What does TI mean in commercial real estate? It's shorthand for "tenant improvement", the customization work done to a leased space, and often used interchangeably with "build-out."
Who pays for tenant improvements? It varies by lease, commonly the landlord provides a TI allowance covering some or all of the cost, though tenant-funded and turnkey (landlord-built) arrangements are both common as well.
What is a TI allowance? The amount of money, often expressed as dollars per square foot, that a landlord contributes toward a tenant's improvement costs, typically via reimbursement after the work is documented.
How much does tenant improvement cost? Highly variable by space type and starting condition, anywhere from roughly $20/sq ft for a cosmetic refresh up to $200–$250/sq ft for a cold shell buildout or a full change-of-use conversion.
How long does a TI project take? Typically four to nine months from lease signing to opening, covering design, landlord approval, permitting, and construction, longer for more complex projects.
What's the difference between cold shell and warm shell? A cold shell is essentially raw space with minimal systems in place; a warm shell has basic HVAC, electrical, and restroom infrastructure already installed, requiring less foundational work during TI.
Can I take my tenant improvements when I leave? Generally no, TI typically becomes part of the building and stays when the lease ends, unless a restoration clause specifically requires you to remove it.
What happens to TI at the end of a lease? It usually remains with the property unless the lease's restoration clause requires removal, worth reviewing this clause carefully before investing heavily in improvements on a shorter lease term.
Do I need permits for tenant improvements? Almost always, yes. TI work is subject to the same building permit and code compliance process as other construction, and starting work without a permit risks a stop-work order and fines.
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Tenant improvement is genuinely foundational to how commercial leasing works, and understanding it, the financial structure, the process, the different flavors of build-out, puts you in a much stronger position whether you're the one negotiating a lease or approving one. The financial mechanics matter as much as the construction itself, and both deserve real attention before you sign anything.
Whichever side of the lease you're on, the piece of this process that turns an agreement into an actual functioning space is professional TI drawings, they're what gets your permit approved, what your contractor builds from, and what protects your investment throughout. Cadtri creates complete, professional TI drawing sets across business types, retail, office, restaurant, medical, and beyond. If you're heading into a TI project, that's a conversation worth having early.
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Related reading: TI Drawing Documentation · [Change of Use Permits] · [Commercial vs. Residential Drawings] · [ADA Compliance Drawings] · How Plan Check Works · [What Drawings Do You Need for a Building Permit?] · [Commercial TI Drawing Services]