Cost to Basement Bathroom Addition in Nashville, TN (2026)
If you’re budgeting a basement bathroom addition in Nashville, most projects run $6,462-$18,464, 8% below the $12,500 national average. What moves that number most is usually one thing: Below-Slab vs. Macerating System. On its own it can swing the cost by $2,000 - $8,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Start with a half bath (toilet and sink) instead of a full bath - you get 70% of the functionality at 50% of the cost.
$6,462-$18,464 in Nashville
8% below the national average · 0.92x cost multiplier
Homeowners in Nashville typically spend $6,462-$18,464 on a basement bathroom addition, about 8% below the national average. Labor rates and contractor availability in the Southeast region drive much of the price difference. Permit requirements and material delivery costs also play a role. See the full tier-by-tier breakdown below before requesting bids.
Cost Breakdown in Nashville
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per bathroom | $4154 | $11540 | $23080 |
| Materials | $2,730 | $5,850 | $13,650 |
| Labor | $3,457 | $6,483 | $10,372 |
| Permits | $585 | $780 | $975 |
| Total | $6,772-8% vs. national avg | $13,113-8% vs. national avg | $26,460-7% vs. national avg |
Budget
Half bath (toilet and sink) added to unfinished basement near existing stack. Basic fixtures, standard tile, and minimal framing.
Mid-Range
Full 3-piece bath (toilet, sink, shower) with below-slab ejector or macerating toilet system, mid-range tile, standard vanity, and proper ventilation.
Premium
Full bath with tile shower, premium fixtures, custom vanity, below-slab plumbing with ejector pump, heated floor, and full exhaust ventilation system.
Material Options
Material prices below are national averages; availability in Nashville may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Macerating (Upflush) Toilet System | $700-$1,800 unit only | Budget basement bathroom additions, retrofit situationsNo concrete breaking required, lower upfront cost, relocatable |
| Below-Slab Ejector Pump System | $1,500-$4,000 for pump and pit only | Long-term reliable basement bathrooms, high-use situationsCode-compliant everywhere, gravity-fed to pump, quieter |
| Standard Ceramic Tile | $3-$10/sq ft materials only | Budget to mid-range basement bathroomsAffordable, durable, waterproof, wide selection |
| Luxury Vinyl Tile (LVT) | $3-$8/sq ft materials only | Budget installs, DIY-friendly flooringWarm underfoot, waterproof, easy DIY install |
| Porcelain Tile (Floor and Shower) | $6-$25/sq ft materials only | Premium basement bathrooms, shower surroundsMost durable, low water absorption, premium look |
Other Projects in Nashville
Nashville Estimate
Typical Range
$6,462-$18,464
vs. National Average
8% below national
Cost Multiplier
0.92x
Cost Per bathroom
$4154-$23080
This 0.92x estimate prices Nashville labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →