ADU Questions · 2026
Does an ADU Need a Separate Utility Meter?
No, an ADU does not automatically need a separate utility meter. Many ADUs share the primary home’s existing electric, water, and gas meters without any problem. A separate meter becomes more common when the ADU will be rented out independently, because it simplifies billing a tenant directly for their own usage.
The short version: A separate meter is not a state requirement for ADUs. Whether one makes sense for your project depends on your utility provider’s rules and how you plan to use the unit, especially if you intend to rent it out.
Why some ADUs share a meter and others don’t
Sharing the primary home’s meter is often the simpler, lower-cost path. There is no new utility account to open, no additional monthly service fee from the utility company, and one bill covers the whole property. This works well when the ADU will house family, serve as a home office, or otherwise stay under the owner’s own use.
A separate meter starts to make more sense once a tenant enters the picture. If you plan to rent the ADU out, a dedicated meter lets the tenant open their own utility account and pay their own usage directly, rather than you estimating a split or building utilities into the rent. It also gives a clearer paper trail if a dispute ever comes up about usage or cost.
Neither approach is universally “better.” It is a tradeoff between simplicity (shared meter) and independent billing (separate meter), and the right call depends on your situation.
What actually determines the answer
There is no single statewide rule that settles this either way. The real answer depends on two things:
| Factor | Why it matters |
|---|---|
| Your utility provider | Each electric, gas, and water provider sets its own rules, fees, and process for adding a new meter to a property. Some make it straightforward, others have more involved requirements. |
| How the unit will be used | Owner use, family use, or long-term personal use often works fine on a shared meter. A rented, income-generating unit is where a separate meter earns its cost. |
Because these variables are provider-specific and project-specific, this is exactly the kind of detail that gets confirmed during design and permitting rather than decided in the abstract. Your plan set and utility coordination will spell out what’s realistic for your address and your goals.
How this fits into building with Framework First
Framework First’s pricing includes a permitting budget and covers utility hookups as part of the build, whether that means tying into the existing meter or coordinating a new one with the utility provider. Exact permit and connection costs are set by your city and utility provider, so they’re confirmed in your feasibility study rather than guessed at upfront. This gets sorted out early, during the planning and permitting phase, so it is not a surprise decision late in the project.
If you already know you want to rent the unit out, mention that up front. It affects not just the utility approach but other choices too, and it is exactly the kind of detail a feasibility study is built to catch before you are locked into a design. You can also see how utility planning fits into the overall build timeline on the process page, or browse available models if you are still weighing size and layout.
Frequently asked questions
Is a separate utility meter required by California ADU law?
No. State ADU law does not mandate a separate meter. It focuses on things like size, setbacks, height, and approval timelines. Utility metering is handled at the provider level, not by state ADU statute.
Does a shared meter cause problems if I rent out the ADU?
Not necessarily, but it does mean you are responsible for figuring out how utility costs get split or absorbed into rent, since the tenant won’t have their own account. Many landlords handle this by building estimated utility costs into the rent price. A separate meter avoids that estimation entirely by letting the tenant pay their own provider directly.
Who decides whether I can get a separate meter?
Your utility provider does. Each electric, gas, and water company has its own process, requirements, and any associated fees for adding a new meter to a property that already has one. This is confirmed during your project’s planning and permitting phase, not decided by the homeowner alone.
Does the type of ADU affect whether a separate meter makes sense?
It can. A detached ADU that will be rented long-term is the most common case where a separate meter pays off, since it functions like an independent rental unit. An ADU used for aging parents, a home office, or other owner-occupied purposes usually has less reason to add one, since usage stays within the household either way.
Ready to see what your utility setup and other project details would look like? Start your feasibility study and get a clear picture before you build.