Open: 24 hours
3580 Polaris Ave #17, Las Vegas, NV 89103
© 2025 Active Plumbing Inc
Plumbing for Room Additions and ADUs in Las Vegas, NV
Building a room addition, garage conversion, or ADU (Accessory Dwelling Unit)? Or turning space over a garage into a small apartment, in-law suite, or rental? When you add bathrooms, kitchens, or laundry to new spaces, the drains, vents, and water lines have to be planned and tied in correctly—or you’ll be dealing with backups, leaks, and code issues later.
✓ Code & inspection focused: Designed to pass inspections and perform long-term.
✓ Licensed pros: Clean, organized plumbing for additions and ADUs in the Las Vegas valley.
✓ Emergency to expansion: We fix the old problems and build out plumbing for new space.
✓ ADU-ready plumbing: Bathrooms, small kitchens, laundry, hose bibs—full wet-wall packages.
✓ Licensed pros
✓ Emergency to expansion
✓ ADU-ready plumbing
✓ Code & inspection focused
What our Clients think about us
Your satisfaction is our priority.
What Is Plumbing for Room Additions and ADUs?
Any time you add living space with plumbing—like a bathroom, small kitchen, or laundry—you need:
Drains and vents designed to tie into the existing sewer system correctly
Water lines (hot and cold) sized and routed to the new fixtures
Proper shutoffs and access for future service
Fixture rough-ins and final trim (toilets, showers, sinks, faucets, etc.)
Plumbing for room additions and ADUs means we:
Review your layout and fixture plan
Design and install drains, vents, and water lines to serve the new space
Tie the new plumbing into your existing system in a code-compliant way
Come back to set and connect fixtures, test everything, and support inspections
Why Choose Active Plumbing
System-based thinking: We don’t just “add a drain”—we look at your whole system, including main lines and venting.
Addition & ADU experience: Used to plumbing garage conversions, casitas, small apartments, and in-law suites.
Emergency-aware: If your project started with a slab leak, sewage backup, or major leak, we can fix the root issue and design the new plumbing around a solid system.
GC & trade friendly: Comfortable working with general contractors, framers, electricians, and HVAC on additions and ADUs.
Code-conscious: We design drain, vent, and water line layouts that meet local code and inspection requirements.
Licensed & insured: Nevada License #0047021, trusted for plumbing on room additions and ADUs in Las Vegas.
Immediate Actions (What to Do Now)
Decide what your addition or ADU needs: bathroom only, bathroom + kitchenette, laundry, or a full mini-apartment
Gather any plans, sketches, or ideas you have, even if they’re rough, so we can see fixture count and locations
Note any existing plumbing problems (slow drains, low pressure, old lines) in the main house that should be addressed before tying in
Take photos of the proposed addition/ADU area, including exterior walls, existing utility spaces, and any open framing if work has started
Call Active Plumbing at (702) 438-3357 and say you need plumbing for a room addition or ADU, and whether it’s tied to an emergency repair, remodel, or new build
Common Addition & ADU Situations We See
Bedroom + bath additions off the back or side of a home
Garage conversions into studios or in-law suites with a bathroom and kitchenette
Detached ADUs/casitas with full bath, kitchenette, and laundry
Converting bonus rooms/lofts into bed/bath combinations
Emergency-driven additions where water damage or a slab leak triggered a remodel and expansion
If you’re already opening walls and floors—or building new—it’s the right time to design the plumbing correctly, not patch off of old, undersized, or failing lines.
Consultation, Site Visit & Fixture Planning
You call (702) 438-3357 and tell us about your addition or ADU plan. On-site, we review existing plumbing, main line locations, water heater placement, and the proposed new space, plus your fixture list (bath, kitchenette, laundry).
Design & Tie-In Plan
We map out drain and vent routes, where the new lines will tie into the existing sewer, and how hot/cold water will be supplied. We consider fixture load, code requirements, and existing problems (like slow drains or old lines) so we’re not building on a weak foundation.
Rough-In Installation
After demo/framing as needed, we install drains, vents, and water lines for all fixtures in the addition/ADU—showers, tubs, toilets, sinks, laundry, and any hose bibs—plus shutoffs and cleanouts as required.
Pressure Testing & Rough Inspection Support
We pressure-test water lines, verify drain and vent slope and layout, and support rough plumbing inspections, making adjustments if needed before walls close and slabs are covered.
Finish Plumbing & Fixture Set
Once finishes (tile, flooring, cabinets, counters) are in, we return to set toilets, sinks, faucets, tub/shower trim, laundry valves, and any kitchen fixtures, then complete connections for disposals, dishwashers, and fridge lines if included.
System Testing, Cleanup & Walkthrough
We test every new fixture for hot/cold, pressure, drainage, and leaks, then walk you and/or your GC through what we installed—shutoff locations, drain tie-ins, and any maintenance notes, especially if this space will be rented as an ADU.
What’s Included
On-site review and planning of plumbing for the addition or ADU, including fixture count and layout
Design and installation of drains, vents, and water lines to serve the new space and tie into existing systems
Rough-in work and pressure testing, ready for inspection
Finish plumbing installation of all specified fixtures and plumbing-connected appliances
Full system testing (hot/cold, drains, and leak checks) for the new addition/ADU
Basic documentation and orientation on shutoffs, cleanouts, and any special features (like custom showers or filtration)
Costs & Timelines (What to Expect)
Plumbing for additions and ADUs is done in phases—rough-in, inspection, and trim—coordinated with your build schedule
Overall cost depends on how many fixtures (bathroom only vs. bath + kitchen + laundry), distance to tie-in points, and slab vs. raised floor or above-garage framing
Projects are priced after a site visit and plan review, so estimates reflect real conditions and your specific layout
Main cost factors include fixture count, drain and vent routing complexity, distance to existing water/sewer lines, need to correct old plumbing, and fixture/valve quality level you choose
Insurance & Claims Help
Many additions and ADUs start because of existing plumbing problems or water damage in the main house:
We can document what plumbing issues existed, what was repaired/replaced, and how the new addition/ADU was tied into a corrected system
Our detailed invoices help clarify scope, cause, and repairs if you’re working with restoration companies or insurance on the main house portion
(Coverage and claim decisions always depend on your specific insurer and policy; this is not financial or legal advice.)
Risks of Waiting (Why Act Now)
Frequent clogs and backups: Improperly tied-in drains and vents can cause gurgling toilets, slow showers, and repeated clogs in the new space and the main house.
Low pressure and bad temps: Undersized or poorly routed water lines can mean weak showers and temperature swings for tenants or guests.
Leaks in new walls and floors: Rushed or untested connections can leak into brand-new finishes, forcing tear-outs.
Failed inspections and delays: Non-code-compliant plumbing can stall your addition or ADU project and add rework costs.
Resale and rental issues: ADUs and additions are scrutinized by inspectors and buyers—bad plumbing can torpedo a deal or devalue a rental.
Methods, Materials & Quality Standards
Code-based design: We size and route drains, vents, and supplies per local plumbing code and fixture load.
Quality materials: We use reliable piping, valves, and fittings appropriate for Las Vegas construction and water conditions.
Proper supports and protection: Piping is strapped, blocked, and protected through framing and concrete to reduce noise, wear, and damage.
Hard-water aware: We consider Las Vegas hard water and can discuss softening/filtration for additions and ADUs if desired.
Thorough testing: Rough-in and finished systems are pressure-tested and run through full operation before sign-off.
Frequently Asked Questions
Can you tell if my existing plumbing can handle an ADU or extra bathroom?
Yes—we evaluate your main line, existing vents, and water supply to see what’s needed to support more fixtures.
Can you work with my GC or designer on the addition/ADU?
Absolutely. We frequently coordinate with general contractors, designers, and architects to keep plumbing aligned with plans and schedules.
Can you add a bathroom to an existing bedroom or bonus room?
Often yes, depending on drain/vent options and access. We’ll review the space and explain what’s feasible and what it takes.
What if my project started because of a leak or slab issue?
We can repair the underlying plumbing problem and design the new addition or ADU plumbing around a solid, updated system.
Do you only handle residential, or small commercial ADUs too?
We primarily handle residential additions and ADUs, and some light commercial—tell us about your project and we’ll let you know how we can help.
Do you offer plumbing for room additions and ADUs near me in Las Vegas?
If you’re in Las Vegas, Henderson, North Las Vegas, Summerlin, or nearby communities, yes—Active Plumbing provides plumbing for room additions and ADUs.
More Active Plumbing Emergency Services
Proudly Serving All of Las Vegas
Address: 3580 Polaris Ave #17, Las Vegas, NV 89103
Phone: (702) 438-3357
Hours: Open 24 hours
Email: service@activeplumbinginc.com
Active Plumbing is Las Vegas–based and available 24/7 for residential and commercial plumbing across Southern Nevada. We handle emergency plumbing, drain cleaning, sewer line repair, slab leaks, water heater repair and installation (including tankless), water softeners and filtration systems, leak detection, gas line installation, and full bathroom and kitchen plumbing upgrades—fast, professional, and backed by strong warranties.
Serving Las Vegas, Henderson, North Las Vegas, Summerlin, Paradise, Spring Valley, Enterprise, Sunrise Manor, Boulder City, and the surrounding neighborhoods.
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CALL (702) 438-3357
Hours: Open 24 hours
3580 Polaris Ave #17, Las Vegas, NV 89103