Cost to Half Bath Addition in San Antonio, TX (2026)
If you’re budgeting a half bath addition in San Antonio, most projects run $4,396-$13,189, 12% below the $8,500 national average. What moves that number most is usually one thing: Proximity to Existing Plumbing. On its own it can swing the cost by $1,500 - $6,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Locate the new half bath on the opposite side of a kitchen or main bathroom wall - shared plumbing walls cut rough-in costs by $1,500-$3,000
In the Southeast (where San Antonio sits): Lower labor costs in most markets; good value region for this type of project.
$4,396-$13,189 in San Antonio
12% below the national average · 0.88x cost multiplier
Expect to pay $4,396-$13,189 for a half bath addition in San Antonio, about 12% below the national benchmark. The Southeast 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 San Antonio prices.
Cost Breakdown in San Antonio
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per room | $2638 | $7474 | $13189 |
| Materials | $1,701 | $3,308 | $6,615 |
| Labor | $2,008 | $3,213 | $6,024 |
| Permits | $567 | $756 | $1,134 |
| Total | $4,276-13% vs. national avg | $7,561-12% vs. national avg | $14,718-12% vs. national avg |
Budget
Converting a closet or unused corner near existing plumbing. Stock toilet, pedestal sink, basic tile floor.
Mid-Range
New framed walls, proper plumbing rough-in, vanity with storage, porcelain tile, ventilation fan.
Premium
Fully built-out addition with custom vanity, designer tile, vessel sink, heated floor, designer lighting.
Material Options
Material prices below are national averages; availability in San Antonio may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Pedestal Sink | $150-$600 installed | Small half baths under 25 sq ft, traditional or vintage aestheticsSpace-saving, classic look, lower cost, easy to install |
| Compact Vanity (24-30 inch) | $400-$1,500 installed | Most half baths - the storage is worth itStorage for toiletries and cleaning supplies, cleaner look, many styles |
| Wall-Mounted Floating Vanity | $600-$2,500 installed | Modern or contemporary home styles, tight spacesMakes small space feel larger, modern aesthetic, easy floor cleaning |
| Patterned Cement or Encaustic Tile Floor | $8-$20/sq ft materials | Making a design statement in a small powder roomHigh visual impact in a small space, unique, trending |
| Basic Elongated Toilet | $300-$700 installed | Standard half baths with adequate floor spaceComfortable, widely available, reliable |
Other Projects in San Antonio
San Antonio Estimate
Typical Range
$4,396-$13,189
vs. National Average
12% below national
Cost Multiplier
0.88x
Cost Per room
$2638-$13189
This 0.88x estimate prices San Antonio 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 →