A permitted, contractor-managed bathroom remodel in Orange County runs $15,000 to $35,000 for a guest or hall bath. A primary suite runs $25,000 to $50,000 and up, and a larger one with an expanded footprint and stone can reach $65,000 to $100,000.
Most of that money buys things you can see. The part that decides whether the room is still sound in fifteen years costs about $1,000 and sits behind the tile.
The waterproofing line
A shower is a container for water that you walk into every day. A membrane and a pan keep the water out of the framing. Both disappear the moment the tile goes on.
Those cost:
- Hot mop pan: $225 to $500. The traditional Southern California method, layers of hot asphalt and felt. Service life depends on the installation and the assembly around it rather than the method alone.
- Custom tile pan: $900 to $3,500. Sloped mortar bed with a sheet or liquid membrane above it. Use this under a curbless or oversized shower.
- Stone pan: $1,200 to $2,000.
- Waterproofing the wet walls: $450 to $750, about a dollar per square foot on top of tile.
Against a $30,000 bathroom, the entire waterproofing package is three percent of the job. It is also the only line where cutting the cost produces a failure that takes the floor, the subfloor and sometimes the ceiling below with it.
A low bid earns a look here first. Ask which pan method, which membrane, and whether the shower gets a flood test before tile.
Where the rest of the money goes
Labour is the largest share. On a $25,000 bathroom, $12,000 to $15,000 of it is labour. A bathroom is a small room with every trade in it: demolition, plumbing, electrical, framing, waterproofing, tile, glass, paint. Each one arrives, works in a space the size of a parking spot, and leaves.
Tile is where the range opens up. Ceramic runs $3 to $6 per square foot installed. Large-format porcelain and natural stone run $18 to $30. Handmade tile like zellige passes $35 for material alone, and it takes longer to set because the pieces are not uniform.
Fixtures and glass move more than people expect. A frameless glass enclosure, a wall-mounted faucet that needs a valve in the wall, a freestanding tub with a floor-mount filler: each carries plumbing work behind it, not only the price on the box.
Does the layout change?
Same as a kitchen, this is the fork that sets the tier.
Keep the toilet, sink and shower where they are and you are replacing surfaces and fixtures. The plumbing stays in the walls and the floor, and the schedule holds.
Move the toilet and you are cutting the slab or opening the floor for a new drain and vent. Convert a tub alcove to a curbless walk-in shower and the framing has to drop to let the pan slope to a drain while the finished floor stays level, which means structural work in a room that had none.
Those two changes are the difference between a $20,000 bathroom and a $45,000 one, and neither of them shows up in a photograph.
What the tiers look like
- $15,000 to $25,000. Guest bath, same layout, ceramic or basic porcelain, stock vanity, standard fixtures.
- $25,000 to $50,000. Primary suite, some layout change, large-format tile or stone, custom vanity, frameless glass, better fixtures.
- $50,000 and up. Expanded footprint, curbless shower, stone slab walls, wall-mounted plumbing, heated floor, structural work.
A primary bathroom in Southern California runs $250 to $500 per square foot depending on finish level. Most sit between 100 and 200 square feet.
Permits
You need a permit to move plumbing, add or move electrical, or change anything structural. Replacing a vanity, a toilet and tile in the same footprint does not require one.
The grey area is the shower conversion. Turning a tub into a shower touches drain location and framing, which puts it on the permitted side. A contractor who tells you otherwise is deciding your risk for you, and the risk lands on the house at resale.
What to ask before you sign
- Which shower pan method, and does the shower get a flood test before tile goes on?
- Is the tile a selection or an allowance? An allowance is a placeholder, not a price.
- Who supplies the glass, and is it measured after tile rather than before?
- What happens if you find rot in the framing behind the old shower? Ask for the rate and the approval process for that discovery, because on a bathroom of any age it is a real possibility.
- Is the exhaust fan ducted outside, or into the attic? The second one is common and it is wrong.
Timeline
Three to six weeks of construction for most bathrooms. Same-footprint work sits at the bottom. Moved plumbing, a curbless shower or a custom glass enclosure push toward the top, and glass adds a gap: it gets measured after tile is set and takes one to two weeks to fabricate. The room sits finished but unusable while you wait.
Common questions
Can I use the house with one bathroom out? Most people manage if there is a second bathroom. Single-bathroom houses are harder, and worth discussing before the schedule is set.
Is a curbless shower worth it? It looks better, it is easier to clean, and it stays usable as people age. It also costs more, because the floor has to drop and the waterproofing has to be right across a larger area. It is a good decision made early and an expensive one made late.
Why is my bathroom quote higher per square foot than my kitchen quote? Every trade still has to come, and they are working in a fraction of the space. The fixed costs of a bathroom do not shrink with the room.
The figures here are Orange County market ranges for planning, not a quote. Pricing for a specific bathroom comes from a site visit and a written scope.
VARENTO is a design-build firm working across Orange County and Los Angeles. Our bathroom remodeling work puts layout and waterproofing first and finishes after, and our process sets out how a project runs from the first walkthrough.