ADU and garage conversion plumbing in Sacramento, CA
An ADU is a small house, and it needs everything a house needs from the plumbing.
We plan sewer, water and gas service for backyard ADUs and garage conversions, check that the existing sewer line can take the extra flow, and install rough-in and finish plumbing through inspection.
What adu plumbing covers
California has made accessory dwelling units much easier to build, and Sacramento-area homeowners are adding them for family, rental income or home offices. Plumbing is one of the biggest variables in the budget, mostly because of the sewer connection.
An ADU's drain has to reach the main sewer with proper slope. That can mean a long trench, a sewer ejector pump on flat lots, or an upgrade to an old lateral that cannot handle more flow. We camera and measure first so the plan and budget are real.
Signs it is time to call
- Backyard ADU plannedSewer route and depth set the cost.
- Garage conversionSlab work for a bathroom and kitchen.
- Older sewer lateralMay need repair before tie-in.
- Separate water meter wantedCoordinated with the water provider.
- Gas or all-electricDecide early for water heating and cooking.
Typical plumbing scope for a one-bath ADU, mostly driven by sewer distance and depth. Every price is confirmed on site before work starts.
What moves the price
| Factor | How it affects the job |
|---|---|
| Sewer distance and depth | The biggest variable on most ADUs. |
| Gravity or pump | Ejector systems add cost on flat lots. |
| Water and gas | Line size and route to the new unit. |
| Fixtures | Number of baths and kitchen layout. |
See every typical range side by side in our Sacramento plumbing cost guide.
ADU Plumbing in Sacramento: what we see locally
Many Sacramento lots are flat, which can make sewer slope from a rear ADU tight. Where gravity will not work, an ejector pump is the fallback, and we plan for that early.
Sewer slope and distance from the main house set most of the plumbing cost on an ADU.
In older neighborhoods with clay laterals, we recommend camera inspecting the existing line before design. Tying a new unit into a root-filled lateral is a problem waiting to happen.
What you can safely do before we arrive
- Share site plans and your builder's schedule.
- Locate the existing sewer cleanout.
- Decide on gas or all-electric early.
ADU Plumbing questions
Can my ADU share my sewer line?
Often, yes, if the line is in good condition and sized for the added fixtures.
Does an ADU need its own water heater?
Usually. Tankless or heat pump units are common choices for small units.
Do you work with my builder?
Yes. We work as the plumbing trade for ADU builders and owner-builders.
Fixtures & projects
How we handle adu plumbing
The same four steps on every visit, so you always know what happens next and what it costs.
Site survey
Camera the existing sewer, measure depth and slope.
Plan
Sewer route, water and gas sizing, fixture layout.
Rough-in
Underground and in-wall plumbing, tested and inspected.
Finish
Fixtures, water heater and final inspection.
Keep going
Often booked with adu plumbing
Sewer Camera Inspection
A camera turns guesswork about a sewer line into a video you can watch.
Read moreSewer Line Repair
Most sewer repairs come down to how much pipe is bad and how deep it is.
Read moreBathroom Remodel Plumbing
The plumbing decisions in a bath remodel get locked in behind tile, so they have to be right the first time.
Read moreTankless Water Heater Installation
Tankless works best when the gas line, venting and sizing are planned, not guessed.
Read moreWater where it should not be? Call now.
A John's plumber answers (916) 602-0883 day and night, tells you how to stop the damage, and quotes the repair before any work starts.