ADU New-Construction Plumbing
One Subcontractor, Start to Finish
From underground rough-in to final trim — with self-pulled sub-permits and a formal bid in 48 hours. The ADU plumbing subcontractor GCs and owners choose first.
What We Do
Full-Process ADU Plumbing
Garage conversion, detached new build, or JADU — SecurePipe handles every phase of ADU plumbing. One subcontractor, no second-tier subs, fully accountable.
Underground Rough-In
- Below-slab drain, waste & vent layout
- Water-supply stub-outs and embeds
- Cleanout and inspection-port installation
- Slope calculation & CPC compliance verification
- Tie-in to city sewer / septic
Interior Rough-In
- In-wall water supply (copper / PEX)
- Drain, waste & vent assembly
- Top-plate penetrations & roof vent caps
- Stub-outs for bath, kitchen & laundry
- Water-heater supply & recirculation pre-pipe
Finish / Trim Phase
- Toilet, sink & shower installation
- Sink, dishwasher & refrigerator hookups
- Washing-machine connection completion
- Final water-heater install & commissioning
- Exterior hose bibs & utility terminations
Gas Piping
- Gas-main extension & branch routing
- Water-heater, range & dryer gas hookups
- Pressure testing & AHJ inspection
- Coordination with the gas utility for connection
- Meets California Title 24 energy requirements
Permit Filing
- C-36 license holder self-pulls the sub-permit
- Prepare as-builts / plumbing plans
- Communicate with the AHJ on the owner’s behalf
- Coordinate both rough and finish inspections
- Hand over documents once inspections pass
GC Document Package
- Certificate of Insurance (COI) available on request
- W-9 form · lien waivers
- Written fixed-price contract
- As-built records & inspection reports
- Warranty documentation
How It Works
ADU Plumbing in Five Steps
From first call to a passed AHJ inspection — transparent the whole way, no surprises.
On-Site Assessment
Free on-site or remote assessment to confirm scope and city tie-in conditions.
48-Hour Bid
A written fixed-price bid, itemized and clear, with no hidden fees.
Pull the Permit
Our C-36 license holder self-pulls the sub-permit and prepares as-built drawings.
Rough-In + Trim
Completed in phases on the build schedule, working to the GC’s timeline.
AHJ Inspection
We coordinate the building department’s on-site inspection to pass the first time.
Why Choose Us
Not Just a Subcontractor
The Plumbing Expert on Your Jobsite
The Inland Empire ADU boom has brought a flood of low-quality subs. SecurePipe lets its license, compliance, and paperwork do the talking.
C-36 Licensed — No Gray-Area Work
The license holder works the job directly and legally self-pulls every permit required — never riding on the GC’s license.
Fixed Price — No Mid-Job Upcharges
The written bid is the final price — no “we found something” surprise add-ons, so the GC keeps budget control.
Fast Response — No Schedule Drag
Formal bid in 48 hours, matched to the GC’s schedule — never the bottleneck.
Fluent Mandarin & English
Owners deal with us directly — no interpreter, fewer miscommunications, faster decisions.
SecurePipe vs. a Typical Subcontractor
Build to Code
A Permit for ADU Plumbing Isn’t Optional
California law requires every ADU plumbing job to be done under a valid license with the proper permit. Unpermitted work can block the sale of the home, get a homeowner’s fire-insurance claim denied, and multiply future remodel costs. We hold a C-36 license, pull the permit before work, and support you through AHJ inspection afterward.
We support AHJ inspections in these jurisdictions:
Get Started
ADU project moving forward?
Get a formal bid within 48 hours
Tell us the project address, ADU type, and build phase — we respond fast and keep plumbing off your critical path.
What Owners Say
Real Google reviews · Greater LA & the Inland Empire
“From permit to passing AHJ inspection, SecurePipe handled our backyard ADU end to end. The GC said they were one of the smoothest subs he’s worked with — paperwork complete, on schedule, never needed chasing. Finished 3 days ahead of plan.”
“As a general contractor, I’ve worked with a lot of subs. SecurePipe is one of the few that delivers — bid in 48 hours, pulls their own permit, hands over inspection records at completion — zero hand-holding. We’ll keep using them on future ADU projects.”
“I’d tried two other plumbers before — one had no C-36 license, the other wouldn’t pull permits. SecurePipe showed up to the first meeting with their license number, COI, and W-9 ready. The whole ADU plumbing job was professional and passed inspection the first time.”
All workmanship defects are repaired free; material manufacturing defects are covered by the manufacturer’s warranty, which we help you pursue start to finish.
Our promise on every project
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Permit Guarantee We self-pull the building permit on every job and never work unpermitted — eliminating title disputes down the road.
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Inspection Guarantee Work is done strictly to the CPC with a high first-pass rate — if a correction is needed, we handle it free until it passes.
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Fixed-Price Guarantee Your price is locked at signing — no hidden fees, no mid-job upcharges, unless you change the scope yourself.
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Insurance Guarantee General liability + workers’ comp in force throughout, COI available anytime — protecting owner and GC from jobsite risk.
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Workmanship Guarantee 1-year workmanship guarantee, with brand-name materials that meet ASTM / ASSE standards — no cutting corners.
ADU Plumbing · Detailed FAQ
ADU Plumbing · Timeline by Phase
Based on a standard 400–600 sq ft detached ADU; actual timelines vary with project complexity and AHJ scheduling.
On-site assessment & bid
Measure pipe routing, confirm tie-in points, assess soil and slab conditions, check local code requirements
1–2 daysPermit Filing
Submit plumbing plans to the Building Department and respond to plan check (some cities offer expedited review)
1–4 weeksUnderground rough-in
Excavate; lay the main drain, supply, and gas mains; complete underground connections and backfill
2–4 daysInterior rough-in
Install interior supply/drain mains, vents, and water-heater connections, then pass the rough-in inspection
3–5 daysFinish & final inspection
Set fixtures, faucets, and the water heater; run the pressure test; pass the AHJ final inspection; deliver as-builts
2–3 days