New Construction Plumbing in South Florida: A Homeowner's and Builder's Guide

A new-build home is the single most consequential plumbing decision you'll ever make. Every pipe routed now will still be there 30 years from now. Every shortcut taken will surface as a repair bill. Every material choice affects water quality, energy cost, and eventually the resale value.

We work on ground-up construction projects across Miami-Dade, Broward, and Palm Beach — from single-family custom homes to spec builds and small multi-family. Here's what every homeowner, builder, or developer should understand about new construction plumbing in South Florida.

The 3 phases of new construction plumbing

Phase 1: Underground (pre-slab)

Before concrete is poured, we install everything that has to live under the slab: sanitary drain lines, vent stub-outs, water service entry, and any under-slab supply distribution if the design requires it. This phase is the least forgiving — once the slab is poured, access is through a jackhammer. Every connection is pressure tested and inspected by the county before concrete is poured.

Phase 2: Top-out (framing / rough-in)

After framing is up but before insulation and drywall, we run all the above-slab plumbing: hot and cold water supply, drain-waste-vent above the floor, shower valves, tub drains, toilet flanges, and water heater connections. This is the largest labor phase. Top-out inspection happens before anything is covered — if the inspector finds a code issue, we fix it in the open framing, not behind drywall.

Phase 3: Trim (finish)

After tile, cabinets, and flooring are in, we return for trim — installing every visible fixture, connecting the water heater, pressure-testing the system under normal operating pressure, and making any final adjustments. Final inspection by the county signs off the home for certificate of occupancy.

Materials: what Florida code allows

Supply lines (hot and cold water)

• Type L copper — premium choice. Long-lasting, code-approved, recyclable. Most common in luxury new construction.
• PEX-A (expansion) — modern approved alternative. Fewer connection points, flexible, faster to install, less prone to freezing (not a Florida issue, but helpful for insurance). Used in most production homes.
• CPVC — approved but less common in new luxury construction because of brittleness and longevity concerns over 30+ years.

Drain / waste / vent (DWV)

• Schedule 40 PVC — the standard for new DWV across South Florida.
• Cast iron — still used in some luxury builds for sound reduction on vertical stacks, but rare in single-family.

Water service

• Type K copper for underground runs (thicker-walled than Type L).
• PEX-A or HDPE underground where code permits and when specified.

Code essentials specific to Florida new construction

• Pressure-reducing valve required if street pressure exceeds 80 PSI (common in South Florida)
• Backflow preventer on irrigation connections
• Cleanouts at every change of direction over 45 degrees and at minimum every 50 feet of horizontal drain
• Vent stacks for every fixture to prevent trap siphoning
• Pressure-balancing or thermostatic shower valves (anti-scald)
• Pan under any indoor water heater above a finished space
• Dielectric unions between dissimilar metals
• Shutoffs at every fixture

Whole-home features worth specifying now

These cost little at the rough-in stage but are expensive to add later. Worth specifying in any new build:

• Whole-home water softener loop (even if you don't install the softener now, plumbing the loop costs almost nothing in new construction)
• Hot water recirculation loop for faster hot water at distant fixtures
• Manabloc or central manifold for individual fixture shutoffs
• Future-use stubs for an outdoor shower, pool fill, or summer kitchen sink
• A separate irrigation supply with dedicated backflow preventer
• Pre-wiring and plumbing for a water leak detection and auto-shutoff system

What to look for in a new construction plumbing contractor

On a new-build, the plumber is one of your longest-lived decisions. The work is inside walls you won't open again for decades. Look for:

• Active Florida state plumbing contractor license (verify at myfloridalicense.com)
• General liability and workers' comp insurance — with certificates naming your GC and you
• Experience with new construction specifically (residential remodels and new-build are different disciplines)
• Ability to pull their own permits or work under your GC's master permit
• Clear proposal with line-item scope: fixture count, material specs, phase schedule, payment terms
• References from previous new construction projects in South Florida
• Warranty period (1–2 years minimum on labor, manufacturer warranties on fixtures)

Budget ranges for new construction plumbing in South Florida

New construction plumbing typically represents 4–7% of a home's total construction cost, varying with finish level and complexity:

• Standard single-family 3BR/2BA, production build: $12,000–$20,000
• Custom single-family 4BR/3BA with mid-range finishes: $18,000–$35,000
• Luxury 5BR+/4BA+ with pool, outdoor kitchen, premium fixtures: $35,000–$90,000+
• Small multi-family (duplex, triplex): $25,000–$60,000

These ranges assume code-minimum or above, all licensed and permitted work. Shortcut bids below these ranges almost always come with compromises you'll find later.