Utility Double-Billing in CAM Statements: How Tenants Pay the Same Cost Twice
Utility double-billing is what happens when a tenant is billed directly for a utility, electricity, water, gas, or HVAC, and that same cost also appears in the CAM pool and gets allocated back to the tenant through their pro-rata share. The tenant pays twice for the same usage.
This is distinct from situations where a tenant simply pays high utility costs in CAM. The double-billing problem is structural: the same dollars are flowing through two billing channels simultaneously. It is most common in buildings where some spaces are individually metered and others are on a master meter, or where sub-metering was implemented partially and the accounting system was not updated to reflect the split.
If your space is sub-metered or directly billed for electricity, water, or HVAC, verify that the CAM pool excludes that same usage. The BOMA Green Lease Guide model language explicitly excludes "special services and utilities separately chargeable to individual tenants" from the shared expense pool.
40% of commercial CAM reconciliations contain material billing errors across all error categories (Tango Analytics, 2023)
How double-billing occurs
Sub-metered tenants included in the pool
The most common pattern: a building is initially on a master meter for electricity. The landlord installs individual sub-meters to allow direct billing of high-usage tenants: restaurants, medical offices, data-intensive businesses. The tenant begins receiving direct electricity bills. But the landlord's accounting system continues to include the whole building's electricity cost in the CAM pool, including the usage that is now being billed directly.
The tenant then pays their electric bill plus their pro-rata share of the utility CAM line item. The portion of the CAM utility allocation that corresponds to the tenant's directly billed usage is a double charge.
BOMA's Green Lease Guide addresses this explicitly, including in its model exclusion language: "special services and utilities separately chargeable to individual tenants" are excluded from the common area operating expense pool. ICSC retail CAM forms similarly exclude costs that are "separately chargeable" to a specific tenant under their lease terms.
Incorrect allocation methodology
Even without double-billing, the allocation method can produce overcharges. If common area utilities are divided equally among all tenants (per-tenant allocation) rather than proportionally by square footage, small tenants subsidize large tenants. A 1,000 square foot tenant sharing utilities equally with a 15,000 square foot anchor is paying a 15x larger share per square foot than they should.
Most NNN leases allocate operating expenses on a pro-rata basis, by square footage. If the landlord uses a different methodology for a specific category (such as per-meter or per-tenant), it needs explicit lease authorization. An undisclosed change in methodology is a billing error regardless of whether it results in an overcharge or undercharge.
HVAC cost misallocation
Buildings with shared HVAC systems, a central plant serving both common areas and tenant spaces, are prone to allocation disputes. The total cost of running the central plant includes both the common area portion and the portion attributable to individual tenant HVAC loads. Without sub-metering or documented engineering estimates for the split, the landlord's allocation methodology is not verifiable.
If a restaurant tenant's commercial kitchen exhaust system or walk-in cooler loads are being run off the building's central HVAC and those costs appear in the common area CAM pool, that tenant's direct-use costs are being shared with tenants who derive no benefit from the restaurant's HVAC needs.
15-20% of total CAM billed is recovered on average when tenants conduct a professional audit (Springbord Research, 2022)
Practical context: electricity cost benchmarks
The U.S. Energy Information Administration's Commercial Buildings Energy Consumption Survey (CBECS) provides national electricity expenditure intensity estimates. Reported electricity expenditure for enclosed and strip malls ran approximately $2.02 per square foot annually for electricity alone. At that rate, a 10,000 square foot tenant in a center with 100,000 square feet of occupied space would have a pro-rata share of roughly $2,020 per year in electricity costs, just for their share of common area electric usage.
If the building also includes their directly sub-metered usage (which might run $8,000 to $15,000/year depending on the tenant type), and the CAM pool includes both, the direct portion represents a meaningful double-charge at scale.
Worked dollar example
A strip center has 10 tenants. Common area utilities (parking lot lighting, signage, security systems) total $24,000 per year. This is a legitimate CAM charge divided pro-rata by square footage.
The center also has three tenants who are sub-metered for electricity. Their annual direct electricity bills total $38,000.
The building's total master meter electricity cost is $62,000 ($24,000 common area + $38,000 sub-metered tenant usage). The landlord includes the full $62,000 in the CAM pool because the accounting system has not been updated to exclude the sub-metered amounts.
A tenant with a 6% pro-rata share pays:
- Direct electricity bill: $4,200 (their own sub-metered usage)
- CAM utility share: $62,000 x 6% = $3,720
But the CAM utility share should only be based on the $24,000 in common area costs: $24,000 x 6% = $1,440.
Double-billing overcharge: $3,720 - $1,440 = $2,280 per year.
Over 5 years, assuming flat costs and consistent sub-metering, the recoverable amount is approximately $11,400.
How to check for double-billing
Determine whether your space is individually metered or sub-metered for any utility. Check your lease and your utility bills: if you receive a utility bill from the landlord or the utility company, your space has separate metering.
Pull the utility line items from the CAM reconciliation with descriptions. Common area electricity, gas, and water are legitimate; metered tenant usage should not appear.
Compare the total utility costs in the CAM pool to the metering structure. If the building has 10 tenants and 4 are sub-metered, the CAM pool should exclude the sub-metered portion.
Request the utility invoices and any sub-metering records for the reconciliation period. Verify that the CAM pool reflects only common area usage.
Check the allocation methodology. Is it pro-rata by square footage? If not, what methodology is used and where is it authorized in the lease?
For HVAC, ask whether the system serves both common areas and tenant spaces. If so, request the documentation of how costs are split between the two.
For the full documentation and dispute process, see how to audit CAM charges. For recovery once overcharges are confirmed, see CAM recovery.
Related overcharge types that often appear in the same reconciliation: property tax CAM passthrough and insurance CAM passthrough both involve uncontrollable expense categories with similar verification steps. Also check pro-rata share calculation error when the allocation methodology itself looks wrong.
What documentation to request
- Utility invoices for the reconciliation period (master meter and sub-meter)
- The metering configuration for the property (which spaces are individually metered, which are on the master meter)
- The reconciliation's utility line items with descriptions
- Any engineering estimates or metering reports that support the common area/tenant split for shared HVAC
- Your lease's utility billing provisions
Frequently asked questions
What if I pay electricity directly to the utility company rather than the landlord?
If the utility account is in your name and you pay the utility directly, that is as strong as it gets. Verify that the CAM pool does not include utilities for spaces metered in individual tenant names. Request the utility ledger showing which meters are included in the pool.
Does this overcharge apply to water and gas as well as electricity?
Yes. The same double-billing structure can occur with water (sub-metered for high-use tenants like restaurants or car washes), natural gas, and shared HVAC steam or chilled water. The analysis is the same: identify whether the utility is separately billed to the tenant, then verify whether it is also in the CAM pool.
How common is this type of overcharge?
Sub-metering is more common in newer developments and high-use-tenant buildings. In older shopping centers with master-metered electrical systems where sub-metering was retrofitted, the risk is higher because the accounting update is often incomplete.
What if the landlord says the sub-metered amounts are netted out internally?
Request documentation of the netting calculation. "It's handled internally" is not an acceptable answer to an audit question. The reconciliation should show either (a) utility costs net of sub-metered recoveries, or (b) gross utility costs with a separate line for sub-metered credits. If the netting is not visible in the reconciliation, you cannot verify it occurred.
Can I audit utilities going back multiple years?
Yes, within the applicable audit window and limitations period. Utility cost data and metering records are typically retained by property managers and utility companies for several years. The documentation request should specify the coverage period.
CAMAudit identifies utility line items in the CAM pool and cross-references them against your lease's direct-pay provisions. If your lease requires separate utility billing and the CAM pool includes costs that should be excluded, the system flags the double-billing and calculates your share of the overcharge.
Related: Property tax overallocation in CAM statements | Insurance overcharges in CAM statements | Excluded services CAM charges | Excessive CAM charges
Frequently Asked Questions
What is utility double-billing in a CAM statement?
Utility double-billing occurs when a tenant is charged directly for a utility, such as electricity, water, or HVAC, and that same cost also appears in the shared CAM pool and gets allocated back to the tenant through their pro-rata share. The tenant pays twice for the same usage. It is most common in buildings with mixed metering, where some spaces are individually metered and others are on a master meter.
How do I find out if I am being double-billed for utilities?
Compare your direct utility invoices or lease utility obligations to the utility line items in your CAM reconciliation. If your lease requires you to pay electricity directly to the utility company, any electricity amount in the CAM pool that includes your consumption is a potential double-billing. Request the building's master meter invoices and sub-metering records to verify.
What is the difference between utility double-billing and high utility costs in CAM?
High utility costs in CAM means the shared utility expenses are large but the allocation methodology is correct. Double-billing means the same dollar amounts are flowing through two channels simultaneously: your direct bill and the CAM pool. The double-billing problem is structural, not a matter of the costs being unreasonable.
Can I audit utility charges going back multiple years?
Yes, within your lease's audit window and the applicable statute of limitations. Utility cost records and metering data are typically retained by property managers and utility companies for several years. Your documentation request should specify the coverage period and request both master meter invoices and the sub-metering allocation methodology.
What does my lease need to say to support a utility double-billing dispute?
Look for language specifying how utilities are billed: whether common area utilities are included in CAM, whether your space is separately metered, and what happens when the building transitions from master meter to sub-metering. A lease that requires direct utility payment and also includes gross utility costs in the CAM pool without sub-metering exclusions creates the conditions for double-billing.