Cost to Basement Bathroom Addition in Boise, ID

$7,350–$21,000 in Boise

5% above the national average · 1.05x cost multiplier

Expect to pay $7,350–$21,000 for a basement bathroom addition in Boise, about 5% above the national benchmark. The Mountain West region's contractor market and material costs account for most of this difference. The detailed breakdown below shows how budget, mid-range, and premium projects compare at Boise prices.

Cost Breakdown in Boise

Line Item	Low	Mid	High
Cost per bathroom	$4725	$13125	$26250
Materials	$2,940	$6,300	$14,700
Labor	$4,200	$7,875	$12,600
Permits	$630	$840	$1,050
Total	$7,770+5% vs. national avg	$15,015+5% vs. national avg	$29,925+5% 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 Boise may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Macerating (Upflush) Toilet System	$700-$1,800 unit only	No concrete breaking required, lower upfront cost, relocatable	Requires electricity, more maintenance, not ideal for high-use	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	Code-compliant everywhere, gravity-fed to pump, quieter	Requires breaking concrete slab, higher upfront cost	Long-term reliable basement bathrooms, high-use situationsCode-compliant everywhere, gravity-fed to pump, quieter
Standard Ceramic Tile	$3-$10/sq ft materials only	Affordable, durable, waterproof, wide selection	Grout requires maintenance, cold underfoot	Budget to mid-range basement bathroomsAffordable, durable, waterproof, wide selection
Luxury Vinyl Tile (LVT)	$3-$8/sq ft materials only	Warm underfoot, waterproof, easy DIY install	Less premium look than real tile	Budget installs, DIY-friendly flooringWarm underfoot, waterproof, easy DIY install
Porcelain Tile (Floor and Shower)	$6-$25/sq ft materials only	Most durable, low water absorption, premium look	Higher cost, harder to cut and install	Premium basement bathrooms, shower surroundsMost durable, low water absorption, premium look

Other Projects in Boise

Composite Deck Building

Full Kitchen Remodel

Central AC Installation

Back to national average for Basement Bathroom Addition

Boise Estimate

Typical Range

$7,350–$21,000

vs. National Average

5% above national

Cost Multiplier

1.05x

Cost Per bathroom

$4725–$26250

Estimates apply Boise's 1.05x regional cost multiplier to national averages. Actual bids vary by contractor, project scope, and timing.

See national average costs →