Basement Flooring in San Francisco, CA - a floor that stays put over damp concrete
Damp smell, peeling paint or a cold concrete floor in your basement? We test the slab first, then put down a floor that suits it.
- Licensed and insured.
- Free estimates at your property.
- We reply within 1 business day.
What's the best floor for a basement in San Francisco?
Basement flooring in San Francisco means getting the concrete slab ready and then putting down a floor that can live with the moisture that slab carries, whether that's vinyl plank, engineered wood, carpet, resilient tile or a coating on the concrete itself.
Most people call us because they want to use the basement as an office, a guest room or a play space, and the concrete down there is cold, stained or a little damp. What you pay depends on the size of the room, the material you pick and how much prep the slab needs. The schedule mostly turns on what the moisture test shows, since a wet slab may need to dry or get a moisture coat before anything goes over it. You get your own number once I've seen the slab, and if the bare concrete is the floor you want, epoxy floor coatings may be all it needs.
How do you know your basement floor needs work?
Musty smell or dark patches
Dark spots on the concrete or a smell that gets worse after rain usually mean water is coming up through the slab or in from outside. If you lay a new floor over it without finding the source, you trap that moisture underneath, where it does its damage out of sight.
Paint or coating lifting
Old floor paint that bubbles, flakes or peels in sheets is usually being pushed off by moisture from below. The longer it goes, the more of it lets go, and the more there is to grind off before anything new can go down.
Old tiles curling at the seams
Tiles or sheet flooring that curl, lift or feel loose underfoot mean the adhesive is giving up, often from a damp slab. Don't pull it up yourself before we've talked, for a reason we cover in the steps below.
How we handle basement flooring, from the slab up
A basement floor sits on concrete that can carry water up from below, so the first thing I do is figure out how water gets in and test the slab before I suggest vinyl, engineered wood or anything else. Then our crew cleans and preps the concrete, deals with whatever moisture the test turned up, and puts down the floor we agreed on with something between it and the slab, because basement guidance says water-sensitive materials shouldn't sit right on the concrete. I'd rather spend the time on prep, since most floors that lift or bubble had a problem in the slab before anyone opened a box.
Two related jobs come up on a lot of basements. When the concrete is rough, uneven or carrying a coating we've checked and need to take off, concrete grinding and surface preparation gets it clean and flat enough to hold a new floor. If you'd rather leave the concrete bare, concrete sealing gives it a surface that's easier to sweep and less dusty.
Epoxy coat on the bare slab
Epoxy paint on the slab is a low-cost way to cut the moisture coming through it, and it barely disrupts the room, so it suits a basement used for laundry, storage or a workshop. It's the lighter of the two moisture fixes.
Insulation and a new subfloor
Laying insulation and a new subfloor over the slab makes the room more comfortable and better on energy, which suits a basement you plan to live in. It's the bigger job and it takes height off the room, so it's a harder call under a low ceiling.
Engineered hardwood
A current San Francisco cost guide calls engineered hardwood the better pick for basements and humid rooms, and points owners who want wood toward the engineered kind. It suits a finished basement where you want it to feel like the rest of the house.
Get a basement floor picked for your slab
We reply within one business day to set a time for me to come see the floor. The estimate is free, done at your property, with no pressure and no obligation. I test the slab, show you the options that fit it, and you decide from there.
(415) 918-5395Basement flooring in San Francisco starts with how water gets in
The San Francisco Public Utilities Commission says significant floodwater could get into a building through a street-level door, foundation cracks, a garage at or below street level, or a sewer line with no backflow preventer, the device that stops sewage from flowing back in. Plenty of basements here have at least one of those, so I look for them before we talk floors, because a new floor won't help much if the next heavy rain comes in the door. If your home has already flooded from the combined sewer system or the public right-of-way in heavy rain, you can apply to the utility for a Floodwater Grant, which can provide up to $100,000 for projects that reduce flooding on the property.
We're based in San Francisco and work in the cities around it, down the Peninsula and across the Bay in the East Bay. Older houses with a basement tucked behind the garage are a common call, and we meet the same tight ceilings and damp corners on jobs in Daly City and Oakland.
What happens after you call about your basement floor?
Call or send the form
We get back to you and set up a visit. If there's an old resilient floor down there, tell us then, because old flooring, its backing, felt, paint and adhesive may contain asbestos or crystalline silica, and the testing standard warns against sanding, dry scraping, drilling or grinding them.
I test the slab on site
I look at the floor, check the slab for moisture and old coatings, and see where water could get in. Then I walk you through your options, what each one costs and what each means for your schedule.
Our crew preps and installs
Our own crew prepares the concrete and puts down the system we agreed on. A lead installer runs the job day to day, so you have one person to ask.
Learn how to care for it
Before we leave, we show you how to clean and look after the new floor. Each material has its own needs, so you'll know what to use on it and what to keep off it.
Frequently asked questions
How much does basement flooring cost in San Francisco?
Installed laminate, vinyl plank or engineered hardwood in San Francisco usually runs about $2 to $14 per square foot, going by a current local cost guide, and that's the market's range, not our price. Laminate and vinyl plank sit at the lower end, engineered and solid hardwood cost more, and slab prep and moisture work add to any of them.
Is vinyl plank a good floor for a basement?
Often, but it depends on your slab. The cost guide calls vinyl plank a better basement pick because it resists water. A building science sheet sees it differently over an insulated slab with a plastic sheet against the concrete, since that slab can only dry upward, so it advises letting the slab dry first and skipping vinyl and other finishes that block moisture.
How do I know if my basement slab is dry enough for new flooring?
You test it, and flooring makers generally require a moisture test before their product goes on concrete. Too much moisture after the floor is down can make it come loose, break down or grow microbes. I run that test at the estimate, before we talk materials.
What license does a flooring contractor need in California?
California's C-15 Flooring and Floor Covering Contractors classification covers this work. It includes preparing the surface and installing carpet, resilient tile, wood floors and other flooring, with ceramic tile left out.
What causes a damp basement floor, and will sealing it fix it?
Sealing alone won't fix serious dampness, because those problems can start outside the slab. Poor site grading, which is how the ground slopes around the house, missing gutters or a high water table can all cause it, and sealing the slab's openings or epoxy paint won't keep that water out by themselves.
Should I test for radon before finishing my basement floor?
It's worth considering, and guidance for basement work suggests it. If the levels call for a radon system, it goes in before insulation and the vapor and water barrier layers cover the slab, because getting back to the concrete later means tearing those up.
San Francisco, CA
Book your basement slab test
Have the room's square footage, what's on the floor now and any history of dampness or flooding ready, and the first visit gets a lot further.