A new accessory dwelling unit needs plumbing planned for its kitchen, bathroom, and other water-using fixtures. North Hollywood Plumbing Company provides new plumbing installation for ADU projects in North Hollywood.
The plumbing scope depends on the ADU’s layout and how it will connect to water and drainage services. A detached unit, an addition, and a garage conversion can each have different access and connection requirements.
We work from the project plans and the site conditions to understand what plumbing the unit needs. Contact us with the ADU type, project stage, and plans if available so we can discuss the plumbing scope.
New plumbing needs to coordinate with the ADU plans and construction schedule. The exact steps depend on the project design and permit requirements.

We’ll review the plumbing scope, fixture locations, and available water and drainage connections. For a conversion or addition, the existing plumbing may also need to be assessed before deciding how the new unit will connect.

The plumbing layout accounts for the ADU’s fixtures and their water supply, drainage, and venting needs. The plans and applicable code requirements guide pipe sizing, routing, and connection details.

Installation may include water supply piping, drain and waste piping, vent piping, and connections for the planned fixtures. The work is coordinated with other construction so plumbing can be installed and inspected at the appropriate stages.

Plumbing work may need inspection as part of the permit process. We’ll coordinate the plumbing work with the project requirements and explain what needs to be ready for inspection.
A detached ADU needs plumbing routed from the planned fixtures to water and drainage services. The connection approach depends on the site and whether existing services can accommodate the new unit.
An attached ADU may share a wall or connect to parts of the main home, but the plumbing layout still depends on the approved plans and existing system. We’ll review fixture locations and available connection points before installation.
Converting a garage into an ADU may require adding plumbing where the existing space did not have a kitchen or bathroom. The distance to existing water and drainage lines can affect the routing and amount of work.

A leak under a sink, around a toilet, or at an exposed pipe connection should be checked to find its source. If water is actively spreading, limit contact with the area and shut off the nearest safe water supply if you can.

A drain that repeatedly backs up or empties slowly may need more than a quick clearing. Tell us which fixture is affected and whether other drains are having the same problem.

A toilet that keeps refilling, flushes weakly, or leaks at its base may have a problem with its internal parts, connection, or drain. A description of the symptom can help guide the inspection.
Fixture locations and connection points shape the plumbing plan. We use the project details to understand the required water supply, drainage, and venting work.
For properties within the City of Los Angeles, the Department of Building and Safety lists plumbing permits for installation or modification of drainage, waste and vent, potable water, and other plumbing systems. Permit and inspection requirements depend on the project scope and property jurisdiction.
Contact us about new plumbing for a detached ADU, attached unit, or conversion project. When you reach out, include the property address, ADU type, construction stage, and any available plans or fixture layout.
If your plans are still being developed, tell us what is known about the proposed kitchen, bathroom, and water and drainage connections. We can use those details to discuss the plumbing scope and what information is needed next.
Sometimes. The existing service must be evaluated to determine whether it can serve the ADU and meet applicable plumbing requirements.
Los Angeles guidance for ADU conversions says the unit must have a separate water shutoff valve accessible within the unit. Confirm the requirements for your specific ADU project with the permitting department.
Not always. LADBS guidance says a detached ADU is not required to have an independent drainage connection if the existing service utility complies with the current plumbing code.
For properties within the City of Los Angeles, LADBS lists plumbing permits for installation or modification of plumbing systems such as drainage, waste and vent, and potable water piping. The permit process depends on the work and the property’s jurisdiction.
Cost depends on the unit layout, number and type of fixtures, distance to existing connections, materials, access, and project scope. An accurate quote requires evaluating the plans and site conditions.
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