Gas submetering installs an individual meter for each unit's own gas appliances, so residents are billed for actual consumption instead of a share of the building's master bill. The process runs through six steps: confirming the property has a master gas meter, assessing manifold and clearance feasibility, licensed installation and utility coordination, a code-mandated pressure test, data integration, and activation with resident disclosure. Billee supports the billing and monitoring side of that rollout once meters are live. The pressure test is the step most operators underestimate, since it is a safety requirement first.

Quick answer

Gas submetering works by routing a building's single gas service through a meter bank, called a manifold, that splits consumption measurement out to one meter per unit. Each meter gets a permanent label and its own shutoff valve, so a technician or first responder can isolate any single unit without affecting the rest of the building.

Before any submeter goes live for billing, the piping must pass a pressure or tightness test, a code requirement that exists to confirm there are no leaks, not just to confirm the meter reads correctly. Only after that test passes does the meter's data start feeding a billing platform and resident charges begin.

Key takeaways

• Gas submetering only applies to gas consumed by appliances physically inside and serving a single unit, such as a stove or an in-unit water heater. A shared building boiler needs a different approach entirely.
• Diaphragm meters, built to the American Gas Association's AGA B109.1 standard, are the multifamily norm because they handle low, variable residential flow reliably.
• Individual gas meters typically run through a shared manifold off one utility service tap, not a separate tap per unit.
• A pressure or tightness test is required before gas is authorized to flow to a new meter. This is a safety step first and a billing-accuracy step second.
• Natural gas is odorized by the utility before it reaches the property, under 49 CFR 192.625, so basic leak detectability already exists independent of submetering.
• Billee handles data integration and billing once gas meters are live, watching for anomalies through meter monitoring and proactive alerts.

Why this matters for multifamily operators

Gas is often the utility a portfolio submeters last, after water and electric, and that order makes sense. Gas installation involves more code-driven safety steps and tighter utility coordination than either of the other two, so it typically takes longer to plan and execute.

The recovery case for gas doesn't shrink just because installation takes longer. Properties with individually-metered gas appliances, stoves and in-unit water heaters especially, are billing residents for consumption that would otherwise sit on the operator's master gas account. The same logic applies across all three utilities: residents pay for what they use, and the property stops absorbing a cost it doesn't have to.

Who needs to think about this

Gas submetering applies to properties with a master gas meter feeding appliances that are physically inside and serve only one unit. If residents already have individual utility accounts for gas, there's nothing to submeter; the utility already bills each resident directly. This is the same master-metered vs. submetered distinction that applies to water and electric.

All-electric properties have nothing to submeter for gas at all. And gas that fuels shared central-plant equipment, a building-wide boiler or a centralized domestic hot water system, cannot be volumetrically submetered at the unit level in any meaningful way. That's a different discipline, BTU or heat metering, and it's outside the scope of this guide.

How gas submetering works, step by step

Step 1: Confirm the property needs gas submetering

Start by confirming with the utility whether the property has a master gas meter or individual utility accounts per unit. This is the same first check used for electric and water submetering: if the utility already bills each resident directly, there's no submetering decision to make.

Where a master meter exists, the next question is what it's feeding. Individual in-unit appliances are submeterable. A shared boiler or centralized hot water plant is not, at least not with the volumetric submetering process this guide describes.

Step 2: Assess manifold and clearance feasibility

Gas submeters in multifamily buildings typically don't clamp onto existing lines the way electric CT meters do. Instead, the property's single gas service tap feeds a manifold, a meter bank that splits out to one meter per unit.

Pacific Gas and Electric Company's published meter-location standard illustrates how tightly regulated that configuration is: meter manifolds are limited to one or two tiers not exceeding 60 inches high, each houseline must carry a permanent, durable tag showing the unit it serves, and the meter location itself needs 36 inches of clearance from ignition sources and building openings, plus 3 feet of clear working space in front of the bank. Requirements vary by utility and jurisdiction, but the pattern (strict clearance, individual unit labeling, defined manifold limits) is consistent across gas utilities.

A feasibility assessment checks whether the property's existing meter location can accommodate a multi-unit manifold within those constraints, or whether the gas utility needs to approve a new location before installation can proceed.

Step 3: Get permitted and installed

Gas submeter installation is a heavier-touch process than electric or water. It generally requires a licensed gas fitter or plumber (the specific license varies by jurisdiction), a permit from the local jurisdiction, and direct coordination with the gas utility for the service tap and manifold design itself.

Utility coordination is the biggest procedural difference from electric submetering, where CT meters typically clamp onto existing wiring downstream of the utility meter without the utility's direct involvement in the installation. Multi-meter manifolds are also commonly fitted with thermal shutoff valves that close automatically in a fire, a fire-safety feature with no equivalent in electric or water submetering.

Gas piping work on the property side of the meter, from the manifold to each unit's appliances, falls under the National Fuel Gas Code, NFPA 54, which is why a licensed installer and a permit are non-negotiable steps rather than a formality.

Once installed, each unit's meter is a diaphragm meter built to the AGA B109.1 standard in the large majority of multifamily installations. Diaphragm meters measure gas volume using a chamber of known size, filled and emptied repeatedly as gas flows through it, a design well suited to the low, variable flow of residential use. Larger commercial and industrial applications more often use rotary or turbine meters instead, which handle higher volumes but perform worse at low flow.

Step 4: Pressure-test and commission before anyone gets billed

Pressure testing is the step that most separates gas submetering from its water and electric counterparts. Water's commissioning check (a bucket test or master-meter reconciliation) and electric's (a parallel-run against the master meter) exist to catch billing errors. Gas piping must pass a pressure or tightness test before the gas utility authorizes it to flow, a code-mandated safety requirement, not an optional accuracy step.

Natural gas already carries a layer of built-in safety independent of this test. Utilities are required under 49 CFR 192.625 to odorize natural gas so it's detectable by smell well before it reaches a dangerous concentration. Submetering doesn't change that underlying safety profile; the pressure test simply confirms the new piping and meter installation itself doesn't introduce a leak.

Step 5: Integrate the data into a billing platform

Once a meter passes its pressure test and commissioning check, its readings need to reach a billing platform. Multifamily gas submeters typically report through the same AMR or AMI infrastructure used for water and electric submeters, rather than a gas-specific data protocol.

Once gas submeters are live, meter monitoring and proactive alerts watches the incoming data continuously and flags a spike, drop, or flatline that could indicate a hardware issue, the same pattern already in place for water and electric submetering.

Step 6: Activate billing and disclose to residents

Most states require lease disclosure that a unit is individually metered before submeter-based billing can start; the specific requirements vary, so check current utility billing compliance obligations for the property's state before activating.

The first billing cycle typically runs on the new submeter data, with the commissioning-period readings kept on file as a reference if a resident disputes an early charge.

How long the whole process actually takes

Utility coordination and permitting typically take longer for gas than for water or electric submetering. That's a function of the safety review built into the process, not a delay to try to route around.

Common mistakes

• Rushing or skipping the pressure test to hit a billing activation date. This is a code requirement, not a formality.
• Treating a shared building boiler as submeterable the same way in-unit appliances are.
• Ordering a manifold before confirming the property's meter location can meet clearance requirements.
• Assuming gas installation moves as fast as an electric CT-meter retrofit; the utility coordination step alone usually takes longer.
• Skipping permanent unit labeling on individual gas lines, which creates real risk during emergency shutoffs.
• Starting resident billing before the utility coordination and permitting paperwork is fully closed out.

When to handle this in-house vs. bring in a partner

A single property's gas submetering rollout is a licensed-contractor project that an on-site or regional team can manage with a disciplined checklist and a good relationship with the local gas utility. The work is well-defined, even if it takes longer than an electric or water rollout.

The complexity compounds across a portfolio. Multiple properties mean multiple gas utility territories, multiple Authorities Having Jurisdiction, and multiple permitting timelines running in parallel, on top of the ongoing meter maintenance and calibration every submetering program needs once it's live.

How Billee can help

Billee's Hardware & Maintenance Support handles procurement, installation coordination, and ongoing calibration for metering infrastructure, including the gas submeters this guide describes. Once gas meters are live, meter monitoring and proactive alerts watches the data for anomalies, and Billee's dedicated account team handles billing activation and resident communication.

Billee is built to be the utility management partner that carries a gas submetering rollout from feasibility through the first resident bill, without the operator having to become an expert in gas code themselves.

FAQ

How does gas submetering work in an apartment building? Gas submetering routes a property's single gas service through a manifold that splits consumption measurement out to one diaphragm meter per unit. Each meter's readings feed a billing platform once the installation passes a code-mandated pressure test.

Is it safe to submeter gas in a multifamily property? Gas submetering follows the same safety-code requirements that govern any gas piping work, including a mandatory pressure or tightness test before the gas utility authorizes the new piping to carry gas. Natural gas itself is also odorized by the utility under federal rule before it ever reaches the property, an independent layer of leak detectability.

Do I need a licensed gas fitter to install gas submeters? Most jurisdictions require a licensed gas fitter or plumber to perform gas submeter installation, along with a permit from the local jurisdiction and coordination with the gas utility for the service tap.

Can you submeter gas used by a shared boiler or central hot water system? Volumetric gas submetering, the process this guide describes, applies to individual in-unit appliances, not shared central-plant equipment. Gas consumed by a building-wide boiler requires BTU or heat metering, a different and more specialized approach.

How long does a gas submetering rollout take? Most rollouts run from feasibility assessment through first submeter-based bill in a similar overall window to electric or water submetering, though utility coordination and permitting for gas typically take longer, often 3 to 8 weeks depending on the jurisdiction and utility.

What's the difference between gas submetering and gas allocation (RUBS)? Gas submetering measures each unit's actual consumption with a dedicated meter. Gas allocation, a RUBS approach, estimates each unit's share of the master gas bill using a formula such as square footage or occupancy, without installing individual meters.

Does Billee handle gas submetering billing? Billee integrates gas submeter data into its billing platform once meters are commissioned, and its meter monitoring service flags anomalies like a spike, drop, or flatline in a unit's readings.

Related reading

Gas submetering is the third piece of a three-part process series: see How Electric Submetering Works, Step by Step and Water Submetering Explained for Apartments for the equivalent process walkthroughs on the other two utilities.

Billee handles the billing and meter monitoring side of a gas submetering rollout, so the data a new manifold and meter installation generates turns into accurate resident bills from day one. Talk to the team about your portfolio.

Sources

1. American Gas Association, "B109.1 Standard: Diaphragm-Type Gas Displacement Meters," 2024.
2. Pacific Gas and Electric Company, "Gas Design Standard: Gas Meter Locations (J-15)."
3. U.S. Department of Transportation, Pipeline and Hazardous Materials Safety Administration, "49 CFR 192.625, Odorization of Gas."
4. National Fire Protection Association, "NFPA 54, National Fuel Gas Code."
5. Linc Energy Systems, "PD Meter Types: Rotary Meter and Diaphragm Gas Meters."