ADU Plumbing in Whittier, CAWhittier ADU plumbing that passes inspection the first time.
Building an ADU or garage conversion in Whittier? Hydro Plumbers handles every plumbing phase, from underground and sewer tie-in to final, with one licensed C-36 crew and a flat-rate bid.
Everything your ADU needs, from dirt to final
One crew, one flat bid, and one point of contact for every plumbing phase of your ADU or new build.
Plan review
We review your drawings up front, confirm tie-in points and line sizing, and flag issues before they cost you time in the field.
Underground & sewer
Building drains, sewer lateral tie-ins, and cleanouts, set to grade and ready for underground inspection.
Water service & supply
New water lines from the main house or meter in PEX or copper, sized for your fixture count.
Gas lines
Gas piping for ranges, dryers, and water heaters, sized and pressure-tested to code.
Rough-in & top-out
Drain, waste, vent, and supply lines installed before walls close, coordinated with your framing crew.
Water heater, trim & final
Tank or tankless water heater, fixtures, and trim-out, then final inspection sign-off.
Our process keeps your build on schedule
A 100% inspection pass rate isn't luck. It comes from doing things the same careful way on every job.
Plans & flat bid
We review your drawings, walk the site if needed, and give you a flat-rate bid with no hourly surprises.
Underground
Sewer and water lines trenched, set, and tested, then ready for the underground inspection.
Rough-in & top-out
DWV, supply, and gas lines installed on your framing schedule, usually in 2–5 days.
Pre-inspection check
We pressure-test and walk every line ourselves before the inspector shows up. That's why we pass the first time.
Trim & water heater
Fixtures, water heater, and finish work installed once drywall and cabinets are in.
Final sign-off
We make sure final inspection passes and hand off a finished, working system.
ADU plumbing in Whittier, done right
Whittier is building ADUs
Whittier sees a steady stream of ADU permits every year. More ADUs means more inspections, and plumbing is where many projects get held up.
Tie-ins we check first
Before anyone trenches or pours, we confirm sewer depth and slope, water service size and gas load for the main house plus the ADU.
Homeowners & builders
We work directly with Whittier homeowners and as the plumbing sub for the GCs and ADU builders working here.
Serving Whittier and nearby cities
Based in Garden Grove, we plumb ADUs in Whittier and across Los Angeles County, including La Mirada, Downey, Norwalk, Santa Fe Springs and Pico Rivera.
Orange County
Garden Grove, Anaheim, Santa Ana, Huntington Beach, Irvine, Fullerton, Costa Mesa, Orange, Westminster, and more.
Los Angeles County
Long Beach, Lakewood, Cerritos, Downey, Whittier, Norwalk, Bellflower, and more.
San Diego County
ADU and new construction plumbing throughout San Diego County.
Inland Empire
ADU and new construction plumbing across Riverside and San Bernardino counties.
Building an ADU in Whittier? Let's look at your plans.
Free flat-rate bid. Owner-operated. 100% inspection pass rate.
Common questions about ADU plumbing in Whittier
How much does ADU plumbing cost in Whittier?
It depends on the ADU's size, number of bathrooms, the distance to your main house's sewer and water lines, and whether you need a gas line or sewer upgrade. We review your plans and give you a free, flat-rate bid, so the number we quote is the number you pay.
Do you handle plumbing inspections in Whittier?
Yes. We work under your project's building permit and schedule and pass each plumbing inspection, from underground to final.
Can my Whittier ADU tie into my existing sewer line?
Usually, yes, if the depth and slope of your existing lateral work. We check it during plan review, before you trench or pour, so there are no surprises.
Will my water and gas service handle an ADU?
Sometimes, but undersized lines are one of the most common ADU problems. We check the load for the main house plus the ADU during plan review and size new lines to match.
Do you work with general contractors building ADUs in Whittier?
Yes. Much of our ADU work is as the plumbing sub for GCs and ADU builders. We show up on schedule, communicate directly with your team, and keep inspections on track.