# Rough-In Plumbing for Nashville Additions, ADUs & New Layouts | Luke Lays Pipe

Nashville's ADU ordinance — one of the most permissive in the Southeast since Metro Council's 2022 expansion — has created a significant new category of investor plumbing work. Adding a secondary unit to a Davidson County property requires a full rough-in of kitchen and bath plumbing, Metro Water Services meter application (the long-lead item), and coordination with the main house water service to avoid cross-connection issues. We handle the full permit and coordination stack for Nashville ADU plumbing so investors can focus on the renovation — not the bureaucracy.

**ZIP Codes:** 37201, 37203, 37204, 37205
**County:** Davidson County

## Local Plumbing Issues in Nashville

- Metro Water Services new meter lead times of 4–8 weeks for ADU secondary connections
- Existing main house sewer capacity that may be undersized for added ADU fixture load
- Basement rough-ins requiring ejector pump systems when below the main sewer elevation
- Historic district coordination for additions to East Nashville, Germantown, or Sylvan Park properties
- Permit sequencing complexity — plumbing permit depends on building permit which depends on zoning approval

## Our Process

1. **Plan Review & Code Check** — We review your architect's drawings and confirm all rough-in locations comply with Metro Nashville IPC amendments — including proper vent routing, trap distances, and minimum fixture clearances.
2. **Permit Application** — We handle all plumbing permit applications with Davidson County or the relevant municipality. Turnaround is typically 5–10 business days for standard additions.
3. **Rough-In Installation** — DWV and supply lines are installed per engineered drawings. All penetrations through fire-rated assemblies are properly firestopped per code.
4. **Rough Inspection** — Metro Codes inspector signs off on rough-in before any walls are closed. We coordinate inspection scheduling to fit your GC's critical path.
5. **Trim-Out** — After insulation, drywall, and tile are complete, we return for trim-out — installing all fixtures, making final connections, and pressure-testing the system.

## Frequently Asked Questions

### What is the process for getting a Metro Nashville plumbing permit for an ADU addition?

The ADU plumbing permit process in Davidson County: (1) Confirm zoning allows ADU at your address — this is done via Metro Nashville Planning. (2) Submit the building permit application with site plan and floor plan showing the ADU layout. (3) The plumbing permit is typically pulled as a sub-permit under the building permit. (4) Apply for the Metro Water Services new water meter — this is the critical path item with 4–8 week lead time. (5) Once building permit is active and meter application is submitted, rough-in can begin. We handle steps 3–5 on behalf of our investor clients and flag the Metro Water lead time immediately so it doesn't surprise the project schedule.

## Local Tip for Nashville

For Nashville ADU projects, start the Metro Water meter application the day your building permit is submitted — not after it's approved. The 4–8 week Metro Water lead time is the longest pole in the tent, and you can't receive a CO without the meter being in place.

## Pricing

Nashville ADU rough-in (full kitchen + bath): $4,500–$9,000 depending on location, layout, and ejector pump requirements. Metro Water meter application fee separate. All quoted after site visit and plan review.

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## Contact

- **Phone:** (734) 748-4831
- **Email:** info@lukelayspipe.com
- **Hours:** Monday–Friday: 7:00 AM – 6:00 PM | Saturday: 8:00 AM – 4:00 PM | 24/7 Emergency Service Available

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