Bathroom Additions service in San Jose CA

Bathroom Additions in San Jose, CA

Add a new full or half bathroom -- primary suite expansion, additional family bathroom, or powder room.

2 - 4 months (design + permit + construction)1-year workmanship warranty

Starting at $45,000|Typical range: $45,000 - $95,000

Based on plumbing distance from existing lines, fixture count, and finish level. Powder rooms without a shower run lower.

About Our Bathroom Additions Service

Adding a bathroom is one of the most requested projects for growing San Jose families, especially homes with only one or two bathrooms serving several bedrooms. We handle new plumbing runs, waterproofing, ventilation, and full permit compliance whether you're adding a primary ensuite, a second family bathroom, or a convenient powder room near the main living area.

What's Included

New plumbing supply and drain line installation

Waterproof membrane and tile-ready substrate

Ventilation fan and exhaust routing to code

Electrical for lighting, outlets, and heated flooring option

Framing for new walls, doors, and window if needed

Full city permit and final inspection

Our Process

Design & Plumbing Plan

We plan the fixture layout and plumbing route, often tying into existing lines to minimize excavation and cost.

Permitting

Plans are submitted for plumbing, electrical, and any structural framing changes required for the new bathroom.

Rough-In

Plumbing, electrical, and ventilation rough-in work happens first, followed by inspection before walls are closed.

Finish

Waterproofing, tile-ready substrate, drywall, and paint complete the space, ready for fixtures and final inspection.

Why Bathroom Additions Matters

Reduces morning bottlenecks in growing households
Adds real resale value, especially a second full bathroom
Primary ensuite additions increase daily comfort
Fully permitted plumbing and electrical work
Flexible sizing from powder room to full ensuite

Frequently Asked Questions

How far can a new bathroom be from existing plumbing?

The further from existing supply and drain lines, the more excavation and cost involved. We evaluate your home's plumbing layout during design and recommend the most cost-effective location.

Do you install the tile and fixtures too?

Yes, we coordinate full finish work including tile, vanity, and fixture installation, or we can rough-in the space for your own finish contractor if you prefer.

How long is my water shut off during construction?

We schedule plumbing tie-ins to minimize water shutoff, typically limited to specific windows during the rough-in phase, and always communicate timing in advance.

Bathroom Additions Service Areas

We provide bathroom additions across San Jose and the South Bay, including:

San Jose Santa Clara Sunnyvale Cupertino Campbell Los Gatos Saratoga Milpitas Mountain View Morgan Hill

Get a Free Quote

Free on-site estimate

Starting at

$45,000

Based on plumbing distance from existing lines, fixture count, and finish level. Powder rooms without a shower run lower.

Text Us Request Online Quote

Duration

2 - 4 months (design + permit + construction)

Warranty

1-year workmanship warranty

Other Services

Why Choose Us

Licensed, Bonded & Insured
Design-Build Under One Contract
Permit & Inspection Handled
Free On-Site Estimates
Satisfaction Guaranteed
South Bay Local

Get Your Free Estimate Today

Whether you need a new ADU, a room addition, or a full second story, our team is ready to scope your project. Text us now for a free on-site estimate.

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Since 2011

South Bay Local

Licensed

Bonded & Insured

10+

Cities Served

Free

Estimates Always