Quick Answer: Adding a dedicated laundry room to a San Jose home costs $8,000-$30,000 depending on location and scope. If you’re converting existing space (a closet or unused room) near existing plumbing — the least expensive approach — costs are $8,000-$18,000 for plumbing hookups, a utility sink, cabinetry, 240V electrical circuit (for electric dryer), ventilation, and flooring. If you’re adding new square footage or routing plumbing a long distance through concrete, costs rise to $20,000-$40,000. A building permit is required in San Jose for new plumbing drain/waste/vent connections and electrical circuit additions — typically a building + plumbing + electrical permit combined for around $800-$2,000 in permit fees. The inspection process adds 4-6 weeks to the timeline.
Laundry Room Addition Cost Breakdown — San Jose 2025
| Cost Item | Typical Cost |
|---|---|
| Plumbing (supply + drain + DWV) | $3,000 – $8,000 |
| Electrical (240V dryer circuit + 20A washer circuit) | $800 – $2,500 |
| Dryer ventilation duct to exterior | $300 – $900 |
| Flooring (tile or LVP — water resistant) | $800 – $3,000 |
| Utility sink installation | $400 – $1,200 |
| Cabinetry (upper cabinets for storage) | $1,000 – $4,000 |
| Drywall, paint, trim | $500 – $2,000 |
| Permit fees | $800 – $2,000 |
| Total (converting existing space) | $7,800 – $23,600 |
Quartz Construction adds laundry rooms throughout San Jose — either by converting existing closets/spaces or as part of room addition and ADU projects. CSLB #1003436 | Call (650) 749-7436.
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