Tub-to-Shower Conversion in the Bay Area: Cost, Permits & What to Expect (2026)

Versa Tile

2 days ago

3 min read

Replacing a tub you never use with a roomy walk-in shower is one of the most popular bathroom updates we're asked about. It can make a small bathroom feel bigger, make getting in and out easier, and give you a shower you actually enjoy using.

Here's what's really involved, so you can plan with confidence.

What a conversion actually involves

A good tub-to-shower conversion is more than pulling the tub and adding tile. A typical job includes:

Removing the tub and the old wall tile down to the framing, so the walls can be checked for water damage and rebuilt properly.
Checking the drain. A tub drain usually sits at one end. Depending on the layout, the shower drain may stay in a similar spot or need to move.
Building a new shower floor (pan) that slopes to the drain, with a waterproof liner or membrane underneath.
Waterproofing the walls behind the tile. Tile and grout are a finish, not the waterproofing.
Tile, niches, a bench if you want one, and trim to finish the edges.
A new valve and trim, and usually a glass door or panel.

What it costs in the Bay Area

Every bathroom is different, but these are the typical 2026 ranges from our Bay Area tile cost guide:

Full walk-in shower rebuild (down to the studs, new pan, waterproofing, a niche): about $10,000–$20,000, not including glass.
With frameless glass: about $12,000–$24,000 in total.
Adding a heated floor while the bathroom floor is open: about $1,500–$3,500.
Permits: bathroom permits in the Bay Area often run several hundred dollars to about $1,900, depending on the city and scope.

What pushes a job toward the higher end: moving the drain or valve, a curbless entry, large-format or natural stone tile, extra niches or a bench, and repairs to framing or subfloor that only show up once the old tub is out. National cost data from Fixr puts plumbing to relocate a shower drain at roughly $200–$500 on its own, and each tiled niche at $100–$400, before Bay Area labor rates. (Fixr, walk-in shower cost)

Will a shower fit where my tub is?

Usually, yes. California's plumbing code sets a minimum shower size: at least 1,024 square inches of floor area, and big enough to fit a 30-inch circle. Bay Area cities spell this out in their own guidance, for example Mountain View's bathroom remodel page and Albany's shower guidelines. (City of Mountain View, City of Albany)

Standard alcove tubs are commonly about 60 by 30 inches, so the floor area is rarely the problem. The 30-inch depth is the one to watch: backer board, waterproofing and tile on the back wall all take up space. It's worth measuring before you fall in love with a layout.

The code also requires the shower liner to run at least 3 inches above the top of the finished curb or threshold, pitched toward the drain. (California Plumbing Code §408.7)

Do I need a permit?

In most Bay Area cities, a tub-to-shower conversion needs a permit, especially if plumbing moves. A few examples:

Mountain View requires a permit for all bathroom remodels, including replacing a tub or shower enclosure.
Pleasanton requires a permit for all new, relocated or remodeled bathrooms.
Danville has a simpler "Like-for-Like" submittal when fixtures stay in place; moving the shower goes through the regular alterations process.
Palo Alto offers licensed contractors an instant kitchen/bath permit when the work stays within the existing footprint.

Details and links for each city are in our Bay Area bathroom permit guide.

Should you keep a tub somewhere?

If this is the only tub in the house, it's worth a moment's thought. Families with small children, or anyone who loves a soak, may want a tub in at least one bathroom. Plenty of homeowners convert the primary bath and keep a tub in the hall bath.

Ideas that make a conversion feel custom

A recessed niche sized for your actual bottles
A built-in bench or a fold-down seat
Larger wall tile for fewer grout lines, with a smaller mosaic on the floor for grip
Blocking in the walls for grab bars, even if you don't install them yet
A low curb or curbless entry. See our guide to curbless showers.

Planning your conversion?

Send Mike a few photos of your bathroom, the tub's measurements and your city. He'll tell you what's realistic for your space, what the permit path looks like and what it will take.

Call or text 916-847-2825, or request a free estimate on our website.