New Construction Plumbing Phoenix — Expert Rough-In & Finish Work
Whether you are breaking ground on a custom home, building an ADU on your existing property, or managing a light commercial buildout in the Phoenix metro, the quality of the plumbing rough-in sets the standard for everything that follows. Phoenix Plumbing Co. has been delivering licensed, permitted, inspection-passing new construction plumbing since 2012. We work with homeowners, GCs, architects, and developers to get the plumbing right from the ground up. Call 602-834-1208 to discuss your project
The Three Phases of New Construction Plumbing
Phase 1: Underground / Slab Plumbing
Phase 2: Rough-In Plumbing
Phase 3: Finish Plumbing (Trim-Out)
After drywall, tile, and painting are complete, we return for finish work — installing all visible fixtures, making final connections, and preparing for occupancy inspection. Finish work includes: Installing all faucets, showerheads, and trim kits. Setting and sealing all toilets. Connecting
water heater(s) including gas/electric connections and T&P valve discharge lines. Installing and testing the water softener connection if planned. Making dishwasher and disposal connections. Coordinating the final plumbing inspection for the certificate of occupancy.
Schedule A Service Call
Contact Us
City of Phoenix Permit Requirements and Inspection Process
New construction plumbing in Phoenix requires a plumbing permit issued by the City of Phoenix Development Services Department (or the relevant city jurisdiction for Scottsdale, Mesa, Tempe, Chandler, etc.). The permit application requires plumbing plans showing fixture layout, drain routes, vent diagram, and material specifications for larger projects.
Required inspections: Underground inspection (before slab pour). Rough-in inspection (before insulation and drywall). Final inspection (before occupancy). Each inspection must pass before proceeding to the next phase. We submit for inspections electronically and track status through the city portal, providing you with timely status updates so your project schedule is not held up waiting on plumbing sign-off.
ADU Plumbing — A Growing Phoenix Market
Accessory Dwelling Units are one of the fastest-growing segments of Phoenix residential construction following the city's 2022 ADU ordinance changes that streamlined permitting. ADUs — detached casitas, garage conversions, or attached units — require full plumbing installations that connect to the main home's or a separate utility service.
ADU plumbing scope: New water service connection or tap from the main home's service. Sewer connection (tying into the main home's lateral or running a separate connection to the city main, subject to Phoenix Water Services requirements). Full rough-in and finish plumbing for the ADU bathrooms and kitchen. Water heater installation (tankless units are popular for space-constrained ADUs). Gas line extension if the ADU will have gas appliances.
Phoenix ADU permits include a separate plumbing permit. We are experienced with Phoenix ADU requirements and can pull permits and schedule inspections efficiently. If you are planning an ADU, contact us early — plumbing feasibility (especially the sewer connection location) affects ADU siting and design.
Materials Selection for Phoenix New Construction
Material selection in Phoenix is influenced by the extreme climate and hard water conditions:
PEX-A (Cross-Linked Polyethylene)
Our primary recommendation for new Phoenix construction. PEX-A is more flexible than PEX-B or PEX-C, resists scale buildup on the inner wall, handles Phoenix temperature extremes (ground temperatures can reach 85 degrees Fahrenheit in slab and pipes expand in summer heat), and costs 25-40% less than copper. PEX-A uses expansion fittings (Uponor/Wirsbo system) that are extremely reliable and have virtually no failure history. PEX is approved by Phoenix plumbing code and all major building codes.
Copper
Copper remains the choice for exposed lines in garages, mechanical rooms, and anywhere aesthetics or HOA requirements call for it. Phoenix hard water does cause pinhole corrosion in thin-wall Type L copper over time, particularly in hot water lines — but new construction copper with a water softener performs well. Copper is required by some HOAs for exposed outdoor lines.
ABS/PVC Drain Lines
ABS is our standard drain line material for underground work in Phoenix. PVC schedule 40 is used for above-grade drain and vent lines. Both perform well in Phoenix soil conditions.
New Construction Plumbing FAQs
Do you provide new construction plumbing in Phoenix AZ?
Yes. Phoenix Plumbing Co. offers full
new construction plumbing services in Phoenix AZ for residential and light
commercial projects.
What plumbing work is included in new construction?
We handle underground plumbing, water and drain line installation,
gas lines, rough-in plumbing, fixture installation, and final connections.
Do you work with builders and contractors?
Absolutely. We coordinate closely with builders, general contractors, and project managers to keep timelines on track.
Is your new construction plumbing up to code?
Yes. All work is completed to meet Phoenix and Arizona plumbing code requirements and passes required inspections.
Can you handle plumbing for custom homes?
Yes. We provide custom plumbing solutions for new homes, including layout planning and fixture placement.
Do you install gas lines for new construction?
Yes. We install gas lines for appliances, water heaters, fireplaces, and outdoor features as part of new construction projects.
When does plumbing start during new construction?
Plumbing typically begins after site preparation with underground work, followed by rough-in plumbing before walls are closed.
Do you install water heaters in new builds?
Yes. We install tank and tankless water heaters sized correctly for the home’s needs.
Can you install water softeners and filtration systems?
Yes. Many new construction projects include
water softeners and filtration systems to protect plumbing from Phoenix’s hard water.
Why choose Phoenix Plumbing Co. for new construction plumbing?
We provide experienced crews, clear communication, code-compliant work, and reliable scheduling for smooth project completion.
Water Heater Sizing for New Phoenix Builds
Water heater sizing for a new Phoenix home should account for:
Household size. The standard rule is 10-15 gallons of tank capacity per person. A 4-person household needs a 50-60 gallon tank minimum.
Hard water effects. Phoenix hard water requires more frequent flushing and anode rod maintenance to achieve rated tank life. We recommend sizing up one capacity tier in Phoenix vs. national sizing guides.
Tankless consideration. New construction is an ideal time to install a tankless water heater, especially when paired with a whole-home water softener (which protects the heat exchanger). We design the gas line (or electrical service for electric tankless) to the appropriate size during rough-in.
Solar pre-plumb. Some Phoenix homeowners choose to pre-plumb for future solar water heating (a preheat loop and tank connection) during new construction even if solar is not installed immediately. We can include this in the rough-in at low marginal cost.
From Ground-Break to Move-In — Working With Phoenix Plumbing Co
We join new construction projects at the planning phase — reviewing plans for code compliance, identifying potential conflicts with other trades, and submitting permits early. We then coordinate our three-phase schedule with your GC's project timeline, showing up on time for each phase and prioritizing inspection dates.
Our new construction clients range from individual homeowners building custom homes to developers building multiple homes in a subdivision. We are equipped for both and bring the same licensed, permitted, inspection-passing approach to every project.
Call 602-834-1208 to discuss your new construction project. The earlier you involve your plumber in the planning process, the smoother the project runs.
Outdoor Plumbing for Phoenix New Builds
Phoenix outdoor living is serious — and outdoor plumbing is a significant part of new construction scope:
Hose bibs: Code-required anti-siphon hose bibs at exterior locations, typically front and rear of the home minimum.
Irrigation connections: Dedicated irrigation supply with a pressure regulator and backflow preventer (required by Phoenix Cross-Connection Control Program).
Pool pre-plumb: If a future pool is planned, pre-installing the pool supply, gas, and electrical conduit during new construction saves significant cost later.
Outdoor kitchen:
Gas line, outdoor sink supply and drain, and refrigerator water line if planned during construction.