Who Pays for Repairs in a Commercial Lease? How Vague Language Puts the Bill on You

The HVAC system failed in July. Peak summer. The tenant called the landlord. The landlord pointed to the lease. The lease said ‘tenant shall maintain all mechanical systems.’

The replacement cost: $28,000. Paid entirely by the tenant.

They didn’t negotiate that outcome. They signed it — buried in language that sounded routine at signing but translated to a five-figure obligation when something actually broke.

Repair responsibility is one of the most expensive — and most misread — provisions in any commercial lease. This post explains what to look for, why the language matters, and what to negotiate before you sign.

If you want to know exactly how repairs are allocated in your lease, run it through sasir.ai — our AI-powered lease analysis tool. The first scan is free.

The Core Distinction: Maintain vs. Repair vs. Replace

Most lease disputes over repairs come down to one word: maintain.

Landlords write leases that say ‘tenant shall maintain’ a system. Tenants read this as routine upkeep — changing filters, scheduling service checks. That’s what ‘maintain’ sounds like.

But in commercial leases, ‘maintain’ often has no defined limit. Courts have repeatedly interpreted ‘maintain’ to include repair and, in some jurisdictions, replacement. If your lease says ‘tenant shall maintain the HVAC system’ without carving out replacement, you may own that obligation entirely.

The distinction that actually matters: who pays for routine maintenance vs. who pays for repair vs. who pays for replacement. These are three separate obligations and should be addressed as three separate provisions.

The language to add: ‘Tenant shall be responsible for routine maintenance of mechanical systems. Repair and replacement of any system shall be the landlord’s responsibility unless damage is caused by tenant’s negligence.’ That one sentence changes everything.

The Big Four: HVAC, Roof, Structure, and Plumbing

These four systems generate the majority of repair disputes in commercial leases — and the majority of unexpected tenant costs. Here’s how each typically plays out:

HVAC. The most common battleground. Landlords almost universally try to push HVAC maintenance — and often repair — to the tenant. In NNN leases especially, HVAC replacement can fall to the tenant unless the lease explicitly says otherwise. A full HVAC replacement in a commercial space can run $15,000 to $60,000 depending on size and system type.

Roof. Roof responsibility should always sit with the landlord — it’s structural, it’s shared infrastructure, and the tenant doesn’t own the building. But ‘tenant responsible for repairs’ language sometimes bleeds into structural elements. Search your lease for ‘roof’ and ‘structure’ and confirm both are clearly the landlord’s obligation.

Structure. Walls, foundation, load-bearing elements. These should never be the tenant’s responsibility. But vague maintenance language can create exposure here, particularly in older buildings.

Plumbing. Interior plumbing connected to your operations (sinks, restrooms, drains) is often the tenant’s maintenance obligation. Main lines, building infrastructure, and external connections should be the landlord’s. The split should be defined in the lease.

A two-column test: for every major building system, your lease should make clear whether cost falls to Tenant or Landlord. If the lease leaves it ambiguous, assume it will be interpreted against you.

The Cap That Most Tenants Never Negotiate

Even when repair responsibility is shared or unclear, there is a protection most tenants never think to ask for: an annual repair cost cap.

A cap limits the total dollar amount of repair obligations the tenant can be required to absorb in any given year. Example language: ‘Tenant’s repair obligations under this lease shall not exceed $2,000 in any calendar year. Any repair cost above that threshold shall be the landlord’s responsibility.’

This converts an unlimited, unpredictable liability into a defined, budgetable number. It’s particularly valuable in older buildings or spaces with aging mechanical systems.

Landlords will often resist this. But in a negotiated lease, a cap of $1,000 to $3,000 annually is achievable in most markets, especially if the tenant is taking on other obligations or has strong financials.

The Rent Abatement Protection

There’s a related protection that follows directly from repair responsibility: rent abatement when the landlord fails to repair.

If the landlord is responsible for a system — HVAC, water, power access — and that system fails, you may be unable to operate your business. In that scenario, you should not be required to pay full rent for a space that isn’t habitable or functional.

Negotiate an explicit rent abatement clause: if the landlord fails to restore a covered system within a defined period (typically 5 to 10 business days of written notice), rent abates proportionally until the issue is resolved. This protection creates a financial incentive for the landlord to repair promptly — and protects your business from absorbing the cost of their inaction.

What to Negotiate Before You Sign

• Explicitly carve maintenance from repair and replacement in all system-related clauses

• Assign HVAC repair and replacement to the landlord, unless damage is caused by tenant negligence

• Confirm roof, structure, and building infrastructure are the landlord’s responsibility in writing

• Add a tenant repair cost cap of $1,000–$3,000 annually

• Add a rent abatement clause tied to landlord repair failures

• Request proof of service contracts on major systems before signing

• Add a condition assessment clause requiring the landlord to confirm systems are in good working order at lease commencement

Document everything after you move in. Send written notices for every repair request. Keep logs. In a repair dispute, the tenant with the paper trail almost always has more leverage than the one who called and complained verbally.

The Bottom Line

Repair responsibility language in commercial leases is one of the easiest provisions to miss and one of the most expensive to get wrong. The word ‘maintain’ can cost you tens of thousands of dollars. A two-sentence addition can eliminate that exposure entirely.

Read the maintenance and repair sections of your lease the same way you read the rent clause: carefully, specifically, and with the question of ‘what does this actually obligate me to pay?’ in mind.

If you’re navigating a commercial lease, these additional resources may help:

• CAM Charges Explained: What They Are, What’s Hiding Inside, and How Most Tenants Overpay

• Triple Net Lease Explained: What NNN Really Costs and What Most Tenants Get Wrong

• How to Break a Commercial Lease Early: Your Options, Your Costs, and What the Lease Actually Says

If you want to know exactly how repairs are allocated in your lease — and where your exposure is — run it through sasir.ai. The first scan is free.