Tenant Improvements and Betterments: Who Insures What in a Leased Commercial Space

The Core Problem: One Space, Two Parties, Unclear Coverage

Walk into a leased restaurant, dental practice, or tech startup and you'll see a fully fitted space — custom millwork, plumbing rough-ins, HVAC zoning, specialty lighting. All of it was paid for by the tenant. Most of it is now legally the landlord's property. And frequently, neither party has adequate insurance covering it.

This is not a niche scenario. The majority of commercial tenants undertake some form of build-out when they sign a lease, ranging from a few thousand dollars in cosmetic changes to millions of dollars in ground-up interior construction. Dental offices alone routinely invest $150,000–$500,000 in operatory build-outs. Restaurant tenants regularly spend more than that before serving a single plate.

Yet when I review the insurance certificates these tenants carry, I consistently find one of three problems: TI&B is excluded entirely, the sublimit is a flat $10,000 that hasn't been updated in years, or the coverage exists on paper but is written on an actual cash value basis that would produce a fraction of the real replacement cost after depreciation. Understanding why these gaps occur — and how to close them — starts with understanding the legal landscape of leased space.

For a foundational overview of what commercial property insurance covers more broadly, see our guide to commercial property insurance. The improvements and betterments issue is a specialized layer on top of that foundation.

What Counts as a Tenant Improvement or Betterment

The terms "improvements" and "betterments" are often used interchangeably, but they carry slightly different meanings in underwriting practice:

• Improvements refer to additions that didn't exist before the tenant's occupancy — new partition walls, installed flooring over raw concrete, built-in cabinetry, plumbing added to a space that had none.
• Betterments refer to enhancements to existing elements — replacing standard ceiling tiles with acoustic panels, upgrading electrical service, installing a higher-grade HVAC system in place of a basic one.

Both categories share the same defining characteristic: the tenant paid for them, they are permanently attached to the structure, and they would cost real money to reproduce if destroyed.

What does not qualify as TI&B? Movable trade fixtures and equipment — shelving units on wheels, freestanding display cases, plug-in appliances, point-of-sale terminals — are the tenant's personal property and are covered under a separate line of the commercial property form. The critical distinction is whether the item is permanently affixed. A bolted-down server rack may qualify as TI&B; a rack sitting on raised flooring typically does not.

The treatment of leasehold improvements also varies by industry. A manufacturer may install cranes, heavy machinery foundations, or reinforced flooring that dramatically changes the building's structural value. These are almost always classified as improvements and betterments, regardless of whether the lease calls them "equipment." See how property exposures shift across business types in our article on industry-specific commercial property risks.

How the Lease Governs Insurance Responsibility

Before any insurance policy language matters, the lease controls the game. Commercial leases vary enormously in how they address improvements and betterments, and most tenants sign leases without fully understanding the insurance implications buried in the fine print.

Common Lease Structures

Tenant Insures Everything

Some leases explicitly require the tenant to insure all improvements at replacement cost, naming the landlord as an additional insured or loss payee. This is common in triple-net leases where tenants assume broad property responsibilities.

Landlord Insures the Building Shell and Base Improvements

Some landlords insure the entire building — including tenant improvements — under their own policy. In this case, the tenant's policy should not duplicate that coverage, but the tenant remains exposed to subrogation from the landlord's insurer if the tenant caused the damage.

Split Responsibility

Many leases assign building structure to the landlord and tenant-installed improvements to the tenant. This sounds logical but creates complexity in determining where one ends and the other begins after a loss.

Silent Leases

A substantial number of commercial leases are simply silent on insurance responsibility for improvements. This silence does not mean coverage exists — it means each party's insurer will argue about who should have covered it after a claim.

The practical advice here is unambiguous: obtain a copy of your lease and share the relevant insurance and alterations clauses with your broker before binding coverage. Do not assume. Do not rely on what the landlord's agent told you verbally. Get the contractual allocation in writing and build your coverage around it.

For businesses that are also navigating additional insured requirements with their landlord, the mechanics are explained in detail in our article on additional insured endorsements.

How TI&B Coverage Works on a Commercial Property Policy

On the standard ISO Building and Personal Property Coverage Form (CP 00 10), tenant improvements and betterments fall under personal property of the insured — specifically as the tenant's "use interest" in permanently installed fixtures paid for by the tenant. This is the technical basis for the coverage: not ownership of the physical asset, but the financial interest in being able to use it.

The Use Interest Concept

If a fire destroys a tenant's custom millwork, the landlord's policy may rebuild the space — but not necessarily to the same specification the tenant paid for. The tenant's use interest represents the difference between a bare, standard space and the enhanced space the tenant created. If the landlord rebuilds to a basic standard and the tenant must re-invest to restore their specific configuration, the TI&B coverage on the tenant's policy bridges that gap.

What Happens When Coverage Isn't Triggered

Here's where I see the most painful claim outcomes. ISO forms include a specific provision: if the improvements are repaired or replaced at the expense of others, the insurer owes nothing for that portion. This means if the landlord voluntarily restores the improvements, the tenant's TI&B claim evaporates. If the landlord doesn't restore them and the tenant can't recover the investment, the TI&B limit becomes critical.

Actual Cash Value vs. Replacement Cost

TI&B written on an actual cash value (ACV) basis applies depreciation to the installed improvements. A build-out completed eight years ago will carry significant depreciation — potentially 40–60% depending on the components. A $400,000 dental office build-out could produce a $160,000–$240,000 ACV payout. That gap is the tenant's problem. Replacement cost coverage eliminates the depreciation penalty, but the tenant must ensure the policy limit actually reflects current reconstruction costs, not the original invoice from years ago.

“The single most common source of underinsurance in commercial tenant accounts is improvements and betterments — either excluded, sublimited to a nominal figure, or written on ACV when replacement cost is what the tenant actually needs. It's a fixable problem that only surfaces when it's too late.”

— Greta Holmqvist, Commercial property underwriter and insurance coverage specialist

Common Errors Tenants Make — and How to Correct Them

After reviewing hundreds of commercial property programs for tenants, the errors cluster around a predictable set of mistakes. Each one is correctable with a focused conversation with your broker.

Underreporting the Build-Out Cost

Tenants routinely report the initial construction cost on their application, then never update it. Construction costs have increased substantially over the past several years — a build-out that cost $200,000 in 2018 may cost $320,000 to reproduce today. If the TI&B limit reflects the 2018 figure, the tenant is materially underinsured. Request a coverage review every two to three years, or whenever significant additional work is completed in the space.

Treating the Landlord's Policy as a Safety Net

I hear this rationalization frequently: "The landlord has insurance on the building, so we're covered." This is wrong for multiple reasons. The landlord's policy is designed to protect the landlord's interest, not the tenant's. The landlord's insurer has no obligation to the tenant. And if the landlord's insurer pays a claim caused by the tenant's negligence — a kitchen fire, a burst sprinkler line from negligent maintenance — that insurer can pursue the tenant through subrogation to recover every dollar paid.

Ignoring the Lease's Restoration Clause

Some leases require the tenant to restore the space to its original condition at lease termination — removing all improvements. This creates a liability exposure that isn't a property issue at all, but rather a contractual obligation that can cost tens of thousands of dollars to fulfill. This is typically not covered under a commercial property policy and may require separate legal review.

Forgetting to Coordinate with the Landlord's Waiver of Subrogation

Tenants in leased spaces should routinely negotiate a mutual waiver of subrogation with their landlord. This means each party's insurer agrees not to pursue recovery against the other party after paying a claim. Without this clause — and a matching endorsement on both policies — a loss caused by either party can trigger a subrogation action that defeats the entire purpose of having insurance. See the broader landscape of landlord liability risks in our article on umbrella coverage for landlords.

Practical Steps to Close the Coverage Gap

Getting TI&B coverage right is not complicated, but it requires deliberate action. Here is the sequence I recommend to every commercial tenant:

1. Pull the lease and identify the insurance allocation clause. Find every reference to "alterations," "improvements," "fixtures," and "insurance." Note who is responsible for insuring what.
2. Compile a complete cost record of all improvements. Include original construction invoices, architect fees, permit costs, and any subsequent improvements. This is your insurable value baseline.
3. Adjust for inflation. Apply current construction cost indices to any build-out more than two years old. Your broker or a commercial insurance appraiser can assist with this calculation.
4. Request an explicit TI&B endorsement with an adequate sublimit. Do not accept a default sublimit of $10,000 or $25,000 if your actual investment exceeds that figure — which it almost certainly does.
5. Confirm replacement cost, not ACV, is specified. Verify this in the policy declarations and the endorsement language, not just on the application.
6. Negotiate a waiver of subrogation with your landlord. Have both parties' insurers endorse their respective policies to reflect this waiver.
7. Confirm the landlord's coverage scope. Ask the landlord's broker or property manager directly: does the landlord's policy cover tenant improvements? If yes, to what limit and on what valuation basis?

For a side-by-side comparison of how tenant and building owner property coverage differs structurally, see our article on commercial property insurance for renters vs. building owners.

When the Landlord's Policy Is the Primary Coverage Source

In some lease structures — particularly full-service gross leases in multi-tenant office buildings — the landlord's policy explicitly covers all tenant improvements as part of the building. This arrangement shifts the primary coverage burden to the landlord, but it does not eliminate the tenant's risk exposure.

First, the landlord's policy limit may be insufficient. If the building experiences a major loss involving multiple tenants' improvements, the landlord's policy limit applies to the entire building. If the limit is exhausted, the tenant's improvements may not be fully rebuilt.

Second, the valuation method matters. Even a landlord's policy with adequate limits may rebuild improvements using a standard-grade specification rather than the tenant's original premium-grade finishes. A restaurant tenant who spent $180 per square foot on custom tile and specialty fixtures may find the landlord's insurer rebuilding at $90 per square foot.

Third — and critically — the landlord's insurer's subrogation rights remain active against the tenant unless expressly waived. A tenant who is named as an insured on the landlord's policy, or who has obtained a subrogation waiver, is substantially better protected than a tenant who simply assumes the landlord's policy will take care of everything.

The bottom line: even when the landlord carries primary TI&B coverage, the tenant should verify the specifics, obtain written confirmation, and maintain their own backup coverage if the landlord's program leaves any gaps.