Who is responsible for HVAC unit leaks on the roof in a multi-tenant property?

Direct Answer

In a multi-tenant commercial property, responsibility for HVAC unit leaks on the roof depends on the source of the leak, the commercial lease, the ownership and maintenance arrangements for the HVAC equipment, and who caused or failed to address the problem. The landlord or property owner may be responsible for the roof membrane and waterproofing, while a tenant may be responsible for maintaining HVAC equipment serving its leased space. However, these responsibilities can overlap.

For example, if an HVAC unit develops a condensate drainage problem, the party responsible for maintaining that equipment may need to correct it. If the leak results from deteriorated roof flashing around the unit or a failed roof membrane, responsibility may fall to the party assigned roof maintenance under the lease. If an HVAC contractor damages the roof while servicing equipment, the contractor or the party responsible for its work may also be involved.

Property managers should document the leak, determine whether the water originates from the HVAC system or the roof assembly, notify the appropriate parties, and review the lease and maintenance agreements before assigning costs. If water is actively entering the building, arrange immediate protection and investigation rather than waiting for a responsibility dispute to be resolved.

Who This Applies To

• Commercial property owners and landlords
• Property and facility managers
• Owners of multi-tenant retail centers and office buildings
• Commercial condominium associations and their managers
• Tenants responsible for HVAC equipment
• HVAC contractors and commercial roofing contractors
• Asset managers overseeing multiple commercial properties

Not for: This article provides general property-management guidance. The applicable lease, condominium governing documents, maintenance agreements, insurance policies, and local law determine the actual allocation of responsibility.

1. Determine Where the Water Is Coming From

The first step is to establish whether the problem originates in the HVAC system, the roof assembly, or the interface between them.

Common causes include:

• Condensate drainage problems: A clogged drain line, blocked drain pan, or improperly routed condensate discharge can release water around an HVAC unit.
• Refrigeration or equipment problems: Certain equipment failures can produce unusual moisture or water accumulation that requires HVAC diagnosis.
• Failed roof flashing: Deteriorated flashing around an HVAC curb or penetration can allow rainwater to enter.
• Damaged roof membrane: Punctures, open seams, or deterioration near the unit can create a leak pathway.
• Improper equipment installation: Incorrectly installed curbs, penetrations, or supports can compromise the roof’s waterproofing.
• Maintenance-related damage: HVAC technicians or other contractors may inadvertently damage the roof while accessing or servicing equipment.

Do not assume that water appearing beneath an HVAC unit necessarily means the roof is leaking. An HVAC contractor and a qualified commercial roofing professional may both be needed to establish the source.

2. Identify Who Owns and Maintains the HVAC Equipment

In a multi-tenant property, different tenants may have separate HVAC units, shared systems, or equipment maintained by the landlord.

Situation	Potentially Responsible Party	What to Verify
HVAC unit exclusively serving one tenant	Tenant or landlord, depending on the lease	Equipment ownership and maintenance clauses
Central HVAC system serving several tenants	Often the owner or designated building operator	Shared-system maintenance agreements
Tenant-maintained unit with a clogged condensate line	Party assigned HVAC maintenance	Lease obligations and service records
Roof flashing failure around an HVAC curb	Party responsible for roof maintenance or repairs	Roof-maintenance provisions and cause of failure
Roof damage caused by an HVAC contractor	Potentially the contractor or party responsible for its work	Work order, contract, evidence of damage, and applicable insurance
Leak involving shared building infrastructure	Owner, association, or another designated party	Building documents and maintenance responsibilities

These are common allocation scenarios, not automatic legal rules. The lease and other applicable agreements must be reviewed before determining who pays.

3. Review the Commercial Lease

The lease is often the most important document for determining responsibility between a landlord and tenant.

Review the following provisions:

• Roof maintenance and repair obligations
• HVAC equipment ownership
• HVAC maintenance and replacement responsibilities
• Responsibilities for roof penetrations and equipment curbs
• Tenant alterations and contractor requirements
• Responsibility for damage caused by a tenant or its contractors
• Notice requirements for leaks and other defects
• Repair-cost allocation and indemnification provisions

For example, a lease may require the landlord to maintain the roof while requiring the tenant to service the HVAC unit serving its premises. If a condensate line maintained by the tenant becomes clogged, the tenant may have responsibility for correcting the equipment problem. If the roof membrane around the unit has failed, the landlord may be responsible for the roof repair.

The outcome can differ when the tenant or its contractor caused damage to the roof, or when the lease expressly assigns responsibility for rooftop equipment and associated penetrations to the tenant.

Florida commercial lease disputes illustrate why the written agreement matters. In Bass v. Wollitz, the court considered a commercial lease that specifically assigned roof maintenance to the landlord and other repairs to the tenant. The case demonstrates the importance of the lease’s actual wording rather than assuming that all roof repairs automatically belong to one party.

4. Determine Whether the Roof or HVAC System Failed

Once the parties and their obligations are identified, arrange an appropriate investigation.

An HVAC professional should evaluate issues such as:

• Condensate drain blockage or failure
• Drain-pan condition
• Condensate piping and connections
• Equipment malfunction
• Improper installation or maintenance

A commercial roofing professional should evaluate:

• Roof membrane condition around the unit
• Flashing around the HVAC curb
• Roof penetrations and pipe supports
• Open seams or punctures
• Evidence of water entry
• Damage caused by equipment servicing

If the source remains uncertain, the property manager should coordinate both investigations. Assigning responsibility before establishing the cause can result in unnecessary repairs, repeated leaks, and disputes over costs.

5. Take Immediate Action if Water Is Entering the Building

When a leak is active, protect the building and occupants while the investigation proceeds.

1. Notify building management and the affected tenant.
2. Protect occupants, electrical equipment, inventory, and other vulnerable property.
3. Arrange temporary water-control measures where safe and appropriate.
4. Contact the HVAC contractor if an equipment or condensate problem is suspected.
5. Contact a commercial roofing professional if roof penetration or membrane failure is suspected.
6. Document the condition before and during corrective work.

Do not allow a dispute about payment or lease interpretation to delay reasonable measures to control active water intrusion.

For further guidance, see How Quickly Should You Respond to a Commercial Roof Leak?

6. Document the Leak and the Investigation

Accurate records help the property manager establish what happened, coordinate the responsible parties, and support any later insurance or cost-recovery process.

Maintain the following records:

• Date and time the leak was reported
• Tenant and unit affected
• HVAC unit identification and location
• Photographs of the water, equipment, and affected roof area
• HVAC service reports
• Roof inspection findings
• Contractor work orders and invoices
• Previous repairs involving the same unit or location
• Communications with the tenant, landlord, contractors, and insurer
• Documentation of any resulting interior damage

Distinguish between observed facts and suspected causes. For example, a photograph showing water beneath an HVAC unit does not, by itself, prove that the unit caused the leak.

See also What Documentation Should Be Kept Throughout a Leak Investigation?

7. Determine Who Pays for Repairs

Responsibility for correcting the leak and responsibility for paying for resulting damage are related but separate questions.

Consider the following examples:

• HVAC maintenance failure: The party responsible for maintaining the HVAC system may have to correct a clogged condensate line, subject to the lease and other applicable agreements.
• Roofing failure: The party responsible for maintaining the roof may have to repair failed flashing or membrane, depending on the contract and cause.
• Contractor-caused damage: If an HVAC contractor punctures the membrane, the party that hired the contractor may need to pursue correction or recovery under the service contract and applicable insurance arrangements.
• Combined failure: If equipment maintenance and roof deterioration both contributed to the leak, the parties may need to evaluate each cause and their respective obligations.

Interior damage, tenant property losses, business interruption, and damage to common areas may involve separate lease provisions and insurance policies. Do not assume that the party responsible for repairing the roof is automatically responsible for every resulting loss.

8. What If the Property Is a Commercial Condominium?

Commercial condominium properties can involve additional layers of responsibility.

The association’s declaration, bylaws, maintenance provisions, and applicable law should be reviewed to determine:

• Whether the roof is a common element
• Whether the HVAC unit serves one unit or multiple units
• Who maintains rooftop equipment and related penetrations
• Whether the unit owner or association must arrange repairs
• How repair costs are allocated
• Which insurance policy applies to the damage

Do not automatically apply residential condominium rules to a commercial property. The governing documents and legal framework applicable to the particular condominium must be reviewed.

9. Notify the Appropriate Parties and Insurance Representatives

Once the likely cause and immediate corrective needs are understood, notify the parties responsible under the lease or service agreements.

Depending on the situation, this may include:

• The property owner or landlord
• The affected tenant
• The property manager
• The HVAC service contractor
• The commercial roofing contractor
• The condominium association, if applicable
• The insurance agent or broker

Contact the relevant insurer when the circumstances may involve a covered loss or when the policy requires notice. Follow the applicable policy’s reporting requirements and preserve evidence before making non-emergency alterations that could affect the investigation.

10. Prevent Recurring HVAC-Related Roof Leaks

Once the immediate issue has been corrected, establish a coordinated maintenance process for rooftop equipment and the surrounding roof system.

Recommended practices include:

• Maintain an inventory of rooftop HVAC units and their locations.
• Record which tenants or building systems each unit serves.
• Document the party responsible for HVAC maintenance.
• Require contractors to follow roof-access and protection procedures.
• Inspect flashing and membrane after significant rooftop work.
• Keep records of condensate drainage repairs.
• Track recurring leaks by unit and roof location.
• Coordinate HVAC replacement with roof maintenance or replacement when appropriate.

These practices reduce uncertainty when a leak occurs and help prevent equipment servicing from creating new roof problems.

Related guidance: Does a Commercial Roof Warranty Cover Damage Caused by Other Trades on the Roof?

Bottom Line

In a multi-tenant commercial property, responsibility for HVAC unit leaks depends on the source of the water, the lease, the ownership and maintenance arrangements for the equipment, and whether a party or contractor caused the damage.

Property managers should investigate the source, protect the building, review the applicable agreements, document the findings, and coordinate the appropriate repairs. The HVAC system and the roof should be evaluated separately when necessary so that an equipment problem is not mistaken for a roof failure—or a roof leak is not incorrectly attributed to HVAC equipment.

Related Questions

• Does a Commercial Roof Warranty Cover Damage Caused by Other Trades on the Roof?
• How Should HVAC Replacement Be Coordinated With Roof Replacement?
• Which Should Come First: The New Roof or the New Rooftop Units?
• Who Inspects Rooftop Equipment Reinstallation for Watertightness?

Sources

• Bass v. Wollitz, 384 So. 2d 704 (Florida District Court of Appeal, 1980) — illustrates the importance of the lease’s allocation of roof maintenance responsibilities.
• Fischer v. Collier, 143 So. 2d 710 (Florida District Court of Appeal, 1962) — discusses contractual responsibility for repairs to leased premises.
• Ralston, Inc. v. Miller, 357 So. 2d 1066 (Florida District Court of Appeal, 1978) — addresses express lease provisions requiring a landlord to maintain the roof and structure.
• ShieldLine Roofing — Leak Investigation Documentation.

Last reviewed: October 2026

Related Resources

Coordinating HVAC Replacement With Roof Replacement

Need Commercial Roofing Help?

ShieldLine Roofing can help property managers investigate suspected roof leaks around HVAC units, evaluate flashing and membrane conditions, document findings, and coordinate corrective roofing work with HVAC contractors.

Disclaimer: This information is provided for general educational purposes and is not legal, insurance, engineering, or coverage advice. Responsibility depends on the specific lease, condominium governing documents, service contracts, insurance policies, applicable law, and established facts. Consult qualified legal, insurance, HVAC, and roofing professionals as appropriate.

Commercial Roof Leak Detection & Repair