Quick Answer: Adding a laundry room to a San Jose home costs $8,000-$20,000 to convert an existing space (closet, hallway alcove, or garage corner) into a dedicated laundry room with plumbing, venting, and electrical. Building a new enclosed laundry room addition costs $20,000-$50,000 for 40-80 sq ft, including foundation, framing, utilities, and finishes. Key requirements: (1) 120V/20A dedicated circuit for washing machine; (2) 240V/30A outlet for electric dryer (or gas line stub-out for gas dryer); (3) cold and hot water supply lines plus drain standpipe; (4) exterior vent for dryer exhaust (must terminate outside — not to attic or crawlspace). A building permit is required in San Jose for new plumbing, electrical, and any structural work. The permit is processed through the San José Building Division and inspection is required before closing walls.
Laundry Room Addition Cost by Scope — San Jose 2025
| Scope | Cost Range | Notes |
|---|---|---|
| Convert garage corner or closet (no new walls) | $5,000 – $12,000 | Plumbing, electrical, flooring, appliances |
| Convert hallway closet with shared wall to kitchen/bath | $8,000 – $18,000 | Most efficient — plumbing shared wall |
| Add laundry alcove (new built-in, open to hallway) | $6,000 – $15,000 | Stackable washer/dryer; door optional |
| Enclosed laundry room addition (40-80 sq ft new construction) | $20,000 – $55,000 | Full addition with foundation, framing, permits |
| Combined mudroom + laundry room | $25,000 – $65,000 | Most popular layout for Bay Area homes |
Quartz Construction adds laundry rooms throughout San Jose — standalone conversions and combined mudroom/laundry additions. We handle all plumbing, electrical, permits, and finish work. CSLB #1003436 | Call (650) 749-7436.
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