Nashville House Flipping Plumbing Checklist for Investors

Nashville's flip market rewards investors who go into every acquisition with a clear understanding of plumbing risk — and punishes those who don't. Here's the complete checklist we recommend for every Nashville flip, broken into three phases.

Phase 1: Pre-Acquisition Due Diligence

Before you remove your inspection contingency:

☐Sewer camera inspection — Non-negotiable on any Nashville property built before 1990. $350–$450 investment that reveals whether you're buying a $5,000 pipe belly correction or an $18,000 sewer line replacement. In East Nashville, Madison, and Antioch, we find camera issues on 65–75% of pre-1985 properties.

☐Water pressure test — Measure static pressure at an exterior hose bib. Below 45 PSI suggests PRV failure or restricted supply; above 80 PSI suggests missing PRV. Both are budget line items.

☐Pipe material identification — Document the supply line material (galvanized, copper, polybutylene, PEX) and the DWV material (cast iron, ABS, PVC, orangeburg). This determines your repipe budget before close.

☐Water heater age check — Serial number manufacturer decode (most manufacturers date-encode the first two digits). Heaters 12+ years old should be budgeted for replacement.

☐Backflow preventer status — Check for irrigation system backflow preventer. Absence is a Metro Nashville compliance issue and a potential closing delay.

☐Cleanout access — Confirm existence and accessibility of an exterior main line cleanout. No cleanout = $400–$600 to install before any main line work can be done.

Phase 2: Renovation Scope Decisions

Budget line items to assess for every Nashville flip:

Must-replace (affects listing price or financing):

Polybutylene supply lines (gray plastic, PB2110 stamped) → Full PEX-A repipe

Galvanized supply with significantly restricted flow (test: full-open flow at multiple fixtures simultaneously) → Full PEX-A repipe

Sewer bellies identified on camera → Correction by scope and severity

Water heater over 12 years old → Replacement (standard tank or tankless upgrade)

Should-replace (affects buyer experience and negotiation):

Corroded angle stops throughout the home → Replace all angle stops during repipe or fixture trim-out

Irrigation backflow preventer (uncertified or absent) → Install/certify before listing

Expansion tank missing on closed-loop system → Install during water heater replacement

PRV over 10 years old → Replace during any supply work visit

Optional upgrades (affect buyer perception at specific price points):

Tankless water heater upgrade ($2,500–$4,500 cost, $4,000–$8,000 value impact in $400K+ market)

Individual manifold shutoffs (value-add for rental investors, minimal cost during repipe)

Under-sink filter connections in kitchen (small cost addition, buyer-visible)

Phase 3: Pre-Listing Verification

Before you list, confirm:

☐All permitted plumbing work has final inspection sign-off

☐Sewer camera post-repair footage archived in your documentation file

☐Water heater installation permit (required in Davidson County — verify it was pulled)

☐Backflow preventer certification current with Metro Nashville Water Services

☐All angle stops operational — test every one before listing

☐No active leaks (pressure test documentation from repipe)

☐Irrigation system operational and backflow certified

☐Water pressure verified at 45–80 PSI throughout the home

☐Documentation package assembled: permits, inspection cards, camera footage, pressure test results

Common Nashville Flip Plumbing Mistakes

Mistake 1: Addressing plumbing reactively rather than proactively.

Buyers find the issues you didn't fix. Fix them first and disclose the work — you control the narrative and the cost.

Mistake 2: Spot-repairing polybutylene. Replacing 10 feet of poly doesn't change what an inspector reports. The whole-home disclosure still says "polybutylene present." Full replacement is the only clean answer.

Mistake 3: Skipping the sewer camera on Antioch, Madison, and East Nashville acquisitions. These zip codes have the highest incidence of under-slab and lateral sewer issues in the Nashville metro. The $350 camera inspection is the cheapest risk management tool you have.

Mistake 4: Not pulling permits. Unpermitted plumbing work creates disclosure liability. When the buyer's inspector asks about the new water heater and there's no permit card, you're having an uncomfortable conversation about what else wasn't permitted.

Mistake 5: Scheduling plumbing after other trades are done. Rough-in must happen before drywall. Scheduling conflicts delay the entire project. Coordinate the plumber into your GC's critical path at the start, not when things are running late.

Call (734) 748-4831 to schedule a pre-acquisition sewer camera inspection or to discuss plumbing scope on your next Nashville flip.