A bathroom remodel in San Francisco in 2026: most permit over the counter at DBI, the California Plumbing and Residential Codes shape the wet area, construction runs 8–16 weeks, and one bath costs $25K–$100K+ across four bands. From WDC.
IN THIS PIECE
Can one bathroom be its own project?
Bathrooms are the largest category in our portfolio, 17 of the 38 home projects on our website, and a single bath is a complete project on its own, from $25,000 for a same-layout refresh, when the wet wall can stay and the floor below it is sound. The Department of Building Inspection permits most same-layout baths over the counter, while the California Plumbing Code sets the shower size and drain, California Residential Code Section R303.3 requires exhaust ventilation where there is no openable window, and safety glazing rules govern every pane of glass near water. We Do Construction, a San Francisco design-build firm licensed in California (CSLB #1096552) and listed in the Architectural Digest PRO Directory, designs, permits and builds primary and secondary baths under one fixed contract. Our Primary Bathroom Transformation in San Francisco shows the standalone case: one room taken to the studs, re-plumbed and finished, with the rest of the house left in use.
San Francisco baths are small, old and often interior. 44.7% of the city's 420,054 homes were built before 1940 (U.S. Census ACS 2024), and their baths were added late: no window, a cast-iron stack shared with the flat above, joists cut for a toilet flange decades ago.
That history sets the budget more than the tile does. The first week of demolition answers three questions: can the drain stay, is the subfloor flat enough for large-format stone, and can the room vent to code without a new roof penetration.
A bathroom remodel in San Francisco costs $25,000 to $100,000 or more in 2026, in four bands set by materials and scope. A same-layout refresh with new fixtures, tile and vanity runs $25,000 to $40,000. A full remodel taken to the studs on the same layout runs $40,000 to $65,000. A primary bath with a moved drain, a curbless shower or slab stone runs $65,000 to $100,000. A spa bath or a bath added to the house starts at $100,000. Construction runs 8 to 16 weeks after design and permits. Most same-layout baths permit over the counter at the Department of Building Inspection, which issued 92.2% of its 2025 permits that way. The California Plumbing Code sets a minimum shower of 1,024 square inches, and an interior bath with no openable window needs ducted exhaust under California Residential Code Section R303.3.
How is a San Francisco bath permitted?
Any San Francisco bathroom remodel that touches plumbing, electrical or walls needs a DBI permit. A same-layout bath files over the counter and usually issues within 1 to 10 business days. Moving the toilet, the shower drain or a wall routes the job into plan review, and work that expands the building envelope adds Planning Code Section 311 notification.
Bathrooms are the most common remodel the city permits: 3,212 San Francisco permits touched a bath in 2025, with a $30,000 median declared valuation (DBI Building Permits dataset, computed August 2026). That is the fee basis, not the finished room.
Three items decide the path. Moving fixtures means new drain and vent routing, reviewed with plans. Reframing a wall can involve structure. Growing past the building envelope triggers Planning Code Section 311 notification, and an exterior window in an Article 10 landmark district needs a Certificate of Appropriateness.
Inspection order: rough plumbing and the shower pan test, rough electrical with GFCI, framing where walls moved, then final, where Title 24 Part 6 lighting and the exhaust fan are checked.
— A bathroom that keeps its drain where it is can be in construction in weeks; a bathroom that moves it waits on the city.
The niche, the valve and the drain are set at rough-in, before the pan test and the first tile.
What matters behind the tile?
The value of a bath sits behind the finish: a continuous waterproof membrane, a drain sized and sloped for a curbless shower, a vent that meets the plumbing code, and an exhaust fan that clears moisture. Get these right and the stone lasts decades; get them wrong and no finish survives.
Waterproofing: bonded sheet or liquid membranes rated to ANSI A118.10 across the full enclosure and floor, flood-tested before tile. A curbless shower needs the floor recessed or the joists dropped, a framing decision in a pre-war house, not a tile decision.
Drains: older baths often share a cast-iron stack with the unit above. Replacing the branch lines while walls are open is routine; replacing the shared stack can touch a neighbor's unit and is priced separately.
Air: California Residential Code Section R303.3 requires ducted exhaust where a bath has no openable window, and CALGreen Section 4.506.1 adds an ENERGY STAR fan with humidity control where a project adds floor area. Glass within reach of water must be safety glazing under Section R308.4.5.
A linear drain lets the floor slope one way, which is what makes a low threshold possible.
Which bath designs hold up?
Good San Francisco bathrooms are designed for light and proportion more than square footage. Large-format stone reduces grout lines in a small room, a curbless shower makes the floor read as one plane, and wall-hung fixtures free the floor so a five-by-eight bath feels larger than it measures.
Book-matched porcelain or marble slabs give a shower wall with no grout to maintain; installed stone and tile run $10 to $50+ per square foot. Slabs need a flat, stiff substrate, so the call is made before framing.
Layout follows the drain: keep the toilet on the existing stack, put the shower where the floor can be recessed, give the vanity the window. A filled stone tub can weigh more than a ton, so we check the framing before committing to one.
Large-format panels keep grout lines to a minimum; the niche is framed before the stone is cut.
“Spend on the membrane and the drain before the faucet. Nobody sees them, and they are the only part that fails.”
— JACOB BACHAR, WDC
How long does a San Francisco bath take?
A San Francisco bathroom remodel takes 8 to 16 weeks of construction after design and permits. A same-layout bath with an over-the-counter permit starts within days of filing. A bath that moves drains or walls adds plan review, so design and stone selection run in parallel with the city's review.
Frameless shower glass is measured after tile, so we book that measurement the day tile is complete.
- Design and selections: Set by scope and selections
- Permit, over the counter: Same day for same-layout work
- Demolition, framing and rough-in: First weeks of construction
- Membrane, pan test and tile: After the pan test passes
- Fixtures, glass and final: Final weeks; glass measured after tile
Bathroom remodel in San Francisco: cost three ways
The 2025 Cost vs Value Report prices a midrange bath remodel in San Francisco at $32,160 and an upscale bath at $97,394. DBI permits for baths carried a $30,000 median declared valuation. Our 2026 pricing runs $25,000 to $100,000 and up across four bands, and the survey figures sit inside them.
The gap between those figures is scope. A midrange remodel replaces fixtures in place; a third-band primary bath rebuilds from the framing with a new drain, a recessed curbless floor, a continuous membrane and slab stone. Our two most recent single-bath contracts in the city, both 2025, came in at $35,000 and $35,818.
On resale, a midrange San Francisco bath recouped 73.8% of its cost in 2025 and an upscale bath 35.1%. Top-band primary baths are bought for daily use.
| Instrument | San Francisco figure | What it measures |
|---|---|---|
| Cost vs Value 2025, midrange bath | $32,160 · 73.8% recouped | Same-layout fixture and finish replacement |
| Cost vs Value 2025, upscale bath | $97,394 · 35.1% recouped | Expanded bath, high-end finishes |
| DBI permits 2025, 3,212 baths | $30,000 median declared | Permit fee basis, not finished cost |
| WDC 2026 pricing, four bands | $25K–$100K+ · one bath | Design-build, all in |
One bath alone, or a larger scope?
Build the primary bath on its own when the drain can stay, the floor framing is sound and the house's electrical service has capacity. Fold it into a larger remodel when the shared drain stack, the panel or the floor structure is due anyway, because those systems are cheaper to replace once.
We decide it at the site visit from three readings. The drain: if the branch line can be replaced without opening the shared stack, the bath stands alone. The panel: radiant floors and steam add load, and a full panel points to a broader electrical scope. The floor: a recessed shower on undersized joists is a framing project.
When the bath stands alone, we design, permit and build it with the rest of the house in use, from $25,000. When it does not, we say so before the owner spends on design. Both paths run on fixed-fee design-build in San Francisco; see finished work on our page for bathroom remodeling in San Francisco.
Wall-hung fixtures need in-wall carriers and blocking, set at rough-in before the room is closed.
“A standalone primary bath gets the same crew and the same inspection sequence as a whole house. Small rooms fail the same way big ones do.”
— JACOB BACHAR, WDC
Frequently Asked
How much does a bathroom remodel cost in San Francisco?
A bathroom remodel in San Francisco costs $25,000 to $100,000 or more in 2026, in four bands: a refresh at $25,000 to $40,000, a full remodel at $40,000 to $65,000, a primary bath at $65,000 to $100,000, and a spa or added bath from $100,000. Drain location and stone decide the band.
How long does a bathroom remodel take in San Francisco?
Construction on a San Francisco bathroom remodel takes 8 to 16 weeks after design and permits. A same-layout bath can permit over the counter on the day it is filed. A bath that moves drains, walls or windows enters plan review, which ran a 185-day median across San Francisco in 2025.
Do I need a permit for a bathroom remodel in San Francisco?
Yes. Any San Francisco bathroom remodel that touches plumbing, electrical or walls needs a Department of Building Inspection permit. Most same-layout baths file over the counter and issue within 1 to 10 business days. Inspectors check rough plumbing, the shower pan test, GFCI wiring and, at final, ventilation and Title 24 lighting.
Can a single bathroom be its own project in San Francisco?
Yes. Bathrooms are the largest category in our portfolio, 17 of the 38 home projects on our website. We build a single bath as its own project from $25,000 when the drain can stay and the floor framing is sound, and we say so at the site visit when a larger scope makes more sense.
Does a bathroom remodel add value in San Francisco?
A midrange bathroom remodel in San Francisco recouped 73.8% of its cost at resale in the 2025 Cost vs Value Report, and an upscale bath recouped 35.1%. A primary bath is mostly a quality-of-life investment, and owners who plan to stay should weigh daily use above the resale percentage.
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