Half Bath Addition Cost Calculator
Estimate the cost of adding a half bath based on number of units, finish level, and optional upgrades.
Last updated: March 25, 2026
Half Bath Addition Cost Calculator
Estimate the cost of adding a half bath based on number of units, finish level, and optional upgrades.
Estimated Total
$8,300
Itemized Breakdown
This calculator provides estimates based on national averages adjusted for your region. Actual costs may vary significantly based on specific project conditions, contractor availability, material prices, and local market factors. Always get at least 3 quotes from licensed, insured contractors before starting your project.
Want the full picture?
Read our complete Half Bath Addition cost guide with material comparisons, contractor tips, savings strategies, and regional pricing data.
Quick Cost Reference
Cost by Tier
Converting a closet or unused corner near existing plumbing. Stock toilet, pedestal sink, basic tile floor.
New framed walls, proper plumbing rough-in, vanity with storage, porcelain tile, ventilation fan.
Fully built-out addition with custom vanity, designer tile, vessel sink, heated floor, designer lighting.