5.0 20 Google reviews Sacramento (916) 706-7460
Certified Plumbing & Drain
New Construction & ADU Plumbing

Family-owned · Sacramento Local

New Construction & ADU Plumbing

Rough-in, finish work, and ADU plumbing handled by licensed tradespeople with 13 years of real build experience.

Call now(916) 706-7460
5.0 · 20 Google reviews
Call (916) 706-7460Request an estimate

Free estimate

Tell us what you need

Three fields. It reaches a person here, not a call centre.

No obligation · Responds within 1 business day

By submitting this form you agree that we may contact you about your request and share your details with partner companies for marketing purposes.

ADU Plumbing and New Build Rough-In

ADU plumbing covers everything from the initial rough-in on a new accessory dwelling unit to the final fixture connections before occupancy, and Certified Plumbing & Drain handles the full scope throughout the greater Sacramento region. If you're building a new home, adding a detached ADU, or working on a commercial new build, the plumbing has to be planned before a single wall goes up, not patched in after the fact. Call (916) 706-7460 to schedule your pre-build consultation.

New construction plumbing breaks into two distinct phases: rough-in and finish. Rough-in is everything inside the walls before drywall, including drain lines, vent stacks, water supply runs, and stub-outs for every fixture location. Finish work is the connection of those stub-outs to actual fixtures once the space is closed and painted. On ADU projects specifically, the job also includes tying into the existing water main and sewer lateral, which often requires permits and inspections the general contractor isn't set up to pull alone. Cost on a new construction project depends on square footage, fixture count, whether the build connects to existing infrastructure or needs new service, and the complexity of the layout. Every job is different, contact Certified Plumbing & Drain for an accurate estimate.

What New Construction Plumbing Actually Covers

From the first trench to the final faucet, here's what a complete plumbing scope includes on a new build.

01

Underground Rough-In

Before the slab pours, drain lines and cleanouts have to be set in the ground at precise fall rates. Get this wrong and you've got standing water, odor problems, or a slab you need to jackhammer. We set it right the first time inspection comes through.

02

Water Supply Rough-In

Hot and cold supply lines need to reach every fixture location with proper sizing for pressure and flow. On larger builds or ADUs with tankless water heaters, this includes calculating the correct pipe diameter so the far end of the run actually delivers adequate pressure.

03

Drain, Waste and Vent (DWV) System

Every drain needs a vent. California code requires a complete DWV system that prevents sewer gas from entering the structure. We size and route vent stacks so inspections pass and the system works exactly as designed, not as an afterthought.

04

ADU Tie-In and Service Connections

Adding an ADU means connecting to the existing water supply and sewer lateral, which often requires city permits and a licensed plumber of record. We handle that process and coordinate with your leak detection and inspection requirements before the inspector shows up.

05

Fixture Finish Work

Once drywall and tile are done, the rough-in stubs get connected to real fixtures: toilets, sinks, showers, tubs, dishwashers, garbage disposals. We do clean finish work that doesn't require backing out the tile contractor. Toilet installation and garbage disposal installation are part of this phase.

06

Inspection Coordination

California building departments require multiple plumbing inspections on new construction. We've been through that process on dozens of projects in the greater Sacramento area. We schedule with your GC, show up on time, and fix punch-list items the same day so your project doesn't sit waiting.

HOW IT WORKS

Three Phases of a New Construction Plumbing Job

  1. 01

    Plan and Permit

    We review your blueprints, calculate fixture counts, size the supply and drain lines, and pull the required permits. This happens before anyone swings a shovel, because a plumbing system designed in the field costs more and passes inspection less often.

  2. 02

    Underground and Rough-In

    Underground lines go in before the slab. Wall rough-in follows framing. We schedule around your GC's timeline so the plumbing inspection doesn't hold up the next trade. Every inspection gets a walk-through with whoever is pulling the permit.

  3. 03

    Finish, Test, and Sign Off

    After walls close and tile sets, we connect fixtures, set water heaters, run final pressure tests, and get the plumbing sign-off. You don't get an occupancy permit without it. We're there until the inspection clears, not halfway through and on to the next job.

ADU BUILDS

ADU Plumbing Is a Different Animal Than a Straight Remodel

An accessory dwelling unit isn't just a room addition. It's a separate living space, which means it needs its own water heater, its own fixture set, its own DWV system, and in most cases its own gas line if you're going with a tankless unit. The tie-in to the existing house's water service and sewer lateral is the part most homeowners don't think about until the permit application asks about it. In the greater Sacramento area, ADUs have been one of the fastest-growing segments of residential construction since California loosened the permitting rules. A lot of contractors are building them now. Not all of them pull a licensed plumber of record for the rough-in, which is both a code violation and a problem that shows up during the resale inspection. We don't skip that step. If you're building an ADU and you've already got a GC lined up, we'll coordinate directly with them. If you don't, we can tell you what to expect from the process. Call (916) 706-7460 and we'll talk through the scope before you commit to a layout.
  • Separate water heater supply and venting for the ADU unit
  • Tie-in to existing house lateral or new sewer connection
  • Permit-ready drawings and plumber of record documentation
  • Coordination with GC inspection schedule
  • Finish fixtures including bathroom and kitchen rough-in
water supply rough in work, professional service in Sacramento, CA

Commercial New Construction Plumbing

Commercial builds run on tighter inspection schedules and higher fixture counts. The process below is how we handle them.

  1. 01

    Pre-Construction Scope Review

    We review commercial plans with your architect or GC before breaking ground. Fixture unit calculations, drain sizing, grease trap requirements if applicable, and backflow prevention all get addressed at this stage, not during a failed inspection.

  2. 02

    Phased Rough-In on Schedule

    Commercial projects move on schedules with real financial consequences for delays. We staff appropriately for the project size and don't send a two-person crew to a 10,000 square foot build. Inspections are scheduled in advance with the GC's super.

  3. 03

    Final Testing and Certificate

    Every commercial system gets pressure tested and documented before we call for final inspection. Hydro-jetting the new drain lines before occupancy is something we recommend on larger commercial builds to clear any debris from the rough-in phase.

Our Promise

Why the Plumber You Pick Changes the Inspection Outcome

13 years in the trade, 20 five-star Google reviews, 100% satisfaction guarantee on every job.

Call (916) 706-7460
  1. 01

    Permit-ready documentation on every project

    We pull permits, show up for inspections, and handle punch-list corrections same day.

  2. 02

    13 years handling residential, ADU, and commercial builds

    Not a franchise. The same people who take your call are the ones on the job site.

  3. 03

    100% satisfaction guarantee

    If something isn't right, we come back and fix it. No argument, no invoice.

  4. 04

    Upfront pricing before any work starts

    You know the number before we pick up a tool. No change orders invented mid-job.

Common Questions About New Construction Plumbing

What's included in a plumbing rough-in for an ADU?
An ADU rough-in includes underground drain lines, toilet and sink stub-outs, shower and tub drain placement, hot and cold supply lines to every fixture location, a vent stack, and a water heater supply and return if you're using a tankless unit. The rough-in ends when everything is stubbed out and ready for inspection, before drywall closes the walls. Fixture connections happen in the finish phase after the structure is weather-tight.
Does an ADU need its own water heater, or can it share with the main house?
In most California jurisdictions an ADU requires its own independent water heater, particularly if it has a full kitchen and bathroom. Sharing the main house unit is possible in limited cases, but the run length and recovery capacity often make it impractical. A dedicated tankless water heater is the most common solution on new ADU builds because of its compact footprint and on-demand output. Every job is different, contact Certified Plumbing & Drain for an accurate estimate.
Is a pipe fitter and a plumber the same thing on a new construction project?
No. A pipe fitter works primarily on industrial process piping and HVAC systems. A licensed plumber handles the potable water supply, drain-waste-vent systems, and gas lines inside residential and commercial structures. California requires a licensed plumbing contractor to pull permits on new construction plumbing. Certified Plumbing & Drain is a licensed California plumbing contractor covering new residential and commercial builds throughout the greater Sacramento area.
How many plumbing inspections does a new construction project typically require?
California new construction typically requires at minimum an underground rough-in inspection before the slab pours, a rough-in inspection before drywall closes, and a final inspection after fixture connections are complete. ADU projects may have additional tie-in inspections depending on the jurisdiction. We coordinate the inspection schedule directly with your general contractor and show up on time. Failed inspections on our work are rare because we walk the job before the inspector does.
Can the plumbing rough-in start before the framing is done?
The underground portion, everything below slab, has to happen before concrete pours regardless of framing status. Wall rough-in requires framing to be complete because the pipes run through studs and top plates. On most residential new builds, underground and wall rough-in are separated by two to four weeks. We schedule around your GC's timeline to avoid sitting idle while waiting for the next phase to open up.
What causes cost to vary on a new construction plumbing scope?
Fixture count is the biggest driver. A one-bath ADU costs significantly less to rough-in than a two-bath unit with a full kitchen and laundry connection. Beyond that, distance from the existing sewer lateral affects cost on ADU tie-ins. Permit fees vary by jurisdiction. Material choices, particularly copper versus PEX for supply lines, affect both cost and long-term performance. Every job is different, contact Certified Plumbing & Drain for an accurate estimate.

Areas We Cover for New Construction Plumbing

We work with builders, developers, and homeowners on new construction and ADU plumbing throughout the greater Sacramento region. If your build site is in any of these areas, call (916) 706-7460 and we'll confirm coverage and schedule a scope review.

18Communities
served

Ready to Talk Through Your New Build Scope?

ADU, residential, or commercial, we've handled it. Call before the permit application, not after.

Call (916) 706-7460 Call (916) 706-7460

Related