Bigger or unusual job? Compare bids from local pros and you pick who does the work.
The service
What floor joist sistering & subfloor replacement is, what a visit covers and where the line is.
The short answer
Floor joist sistering fastens a new full-length board alongside a cracked, rotted or over-notched joist so it carries the load again, and subfloor replacement cuts out soft or water-damaged plywood or boards and installs new sheets glued and screwed to the joists. Floor Joist Sistering & Subfloor Replacement in San Francisco is booked through pros who cover its 28 ZIP codes, in neighborhoods such as The Mission, Noe Valley, and The Sunset. SF's microclimates mean fog, wind, and moisture vary dramatically by neighborhood. Providers account for this in material selection. Independent pros on NorTech set what they charge and what they warrant, and you choose among them.
What a floor joist sistering & subfloor replacement visit includes
What is included depends on the jobs you pick and on how each pro sets up their visit and timing. You see the exact scope with each pro's price before you book.
- Inspection of joists, subfloor and moisture sources
- Removal of rotted or damaged subfloor sections
- Sistering or replacing cracked and rotted joists
- New plywood or OSB subfloor, glued and screwed
- Leveling and squeak reduction
- Cleanup and notes about causes and prevention
Pick what is on your list
Tick what you want done, or add your own. Your list goes under the booking card and to the pro you choose, and you can describe anything else when you book.
Inspect and diagnose
Tick what you want done. One visit can cover several.
Tick jobs above, or add your own. Your list goes under the booking card and to the pro you choose, so they see exactly what you need before they arrive.
What shapes a floor joist sistering & subfloor replacement job
These are the things that make one job different from another. Mention them in your notes so each pro can scope your job properly.
Repair approach
How much of the floor structure is replaced depends on the damage. Your pro recommends one after looking. Tap an option to compare, then add your pick to your job notes.
What is not part of floor joist sistering & subfloor replacement
Knowing where the line is keeps the visit on track and keeps you safe. When a job belongs to a specialist, NorTech tells you before you book.
- Any job where labor and materials together reach $1,000 or more is done by a licensed contractor, and structural floor repair is done by pros who hold that license.
- Plumbing leaks and drain repairs that caused the damage: those are licensed plumber jobs.
- Termite treatment and pest control: that is a licensed pest control operator, with a separate inspection service on NorTech.
- Mold remediation and large-scale water damage restoration, which have their own services.
- New finish flooring, tile or carpet over the repaired subfloor, which are separate services.
- Foundation repair, new footings and structural engineering, which go to the right specialist.
- In San Francisco, sF DBI permit requirements are among the strictest in California. Smaller jobs stay within the handyman exemption; permitted work is bid on by NorTech-verified licensed contractors.
License and permits for floor joist sistering & subfloor replacement
Repairing or replacing floor joists is structural carpentry and is done by pros who hold the license for it. Simple subfloor patches may be within a carpenter's scope, and any job reaching $1,000 in labor and materials goes to a licensed contractor.
A permit is commonly needed when joists are replaced or sistered across several spans, when a wall or fixture rests on them, or when the repair changes the floor structure. Your pro checks local rules and tells you what applies.
Check the pro's license on their NorTech profile, ask to see the permit when one is required and keep before and after photos of the framing for your records.
Plan your visit
How booking works, how to get ready, and what to expect where you live.
How booking floor joist sistering & subfloor replacement works
Say what needs doing
Add your ZIP and a few words about the job.
Compare pros near you
Each pro sets their own price and warranty. NorTech does not pick for you.
Book the pro you pick
Add photos and details on their page. Your card is held and only charged after the work and the photos.
Photos and a warranty
Your pro backs the work with a workmanship warranty — if covered work is not right, your pro makes it right, free.
Before you book floor joist sistering & subfloor replacement
Quick things that save a trip. Tick them off as you go; none of it is required to book.
Describe how the floor feels and where
Note whether it bounces, sags or squeaks, and mark the places on the floor with tape. A pro can diagnose faster when you can say exactly where it is soft and when it started.
Take photos from above and below
Photograph the floor surface, the ceiling below if any, and the crawlspace or basement framing. Water stains, sagging and dark wood help a pro understand the problem.
Fix the water source
Stop any leaks before the carpenter arrives, or book a plumber alongside. Tell the pro if you suspect a toilet, tub, washer or pipe.
Clear access
Open the crawlspace hatch or basement area, move stored items and make sure lights work. If the repair is from above, clear furniture off the floor.
Ask what the finish will look like
If flooring has to come up, ask who puts it back and how a patch will blend. A subfloor repair under hardwood or tile can need a flooring pro afterward.
Keep any inspection reports
A pest, home or plumbing inspection report tells the pro what to look for. Share it with your booking notes.
Say where in San Francisco you are
Add your neighborhood, for example The Mission, Noe Valley, and The Sunset, or your ZIP code to your notes. Pros choose the neighborhoods they cover, and it tells them how far they have to travel.
How where you live changes floor joist sistering & subfloor replacement
Often booked together with floor joist sistering & subfloor replacement
Book several services with one pro. Pros set their own bundle discounts.
A floor soaked by a leak often needs drying and cleanup alongside the structural repair.
A wood-destroying organism inspection shows whether insects caused or share the damage.
Fixing drainage and moisture below the floor keeps the new wood from rotting again.
New finish flooring goes over the repaired subfloor once the structure is sound.
Around San Francisco
Where in San Francisco the work happens, and the cities close by.
Floor Joist Sistering & Subfloor Replacement across San Francisco
Pick your neighborhood to see what homes there tend to need. Pros choose the neighborhoods they cover, so enter your ZIP code to see who covers yours.
Cities near San Francisco
Pros often cover more than one city. The rings show 5 and 10 miles from the center of town.
Other services in San Francisco
Each one has its own page for this city.
Ideal for the long punch list of small fixes that pile up in older SF Victorians and Edwardians, from sticking doors to loose trim, with each pro's visit price shown before you book.
See pros in San FranciscoMany SF flats have original plaster-and-lath walls that crack with settling and seismic movement, and providers can patch both plaster and modern drywall cleanly.
See pros in San FranciscoTall ceilings, ornate Victorian moldings, and compact condo rooms all get a fresh, even finish that holds up to the city's damp, foggy microclimates.
See pros in San FranciscoPerfect for pre-sale punch lists and turnover on TIC units, condos, and rentals across high-turnover neighborhoods like SoMa and the Mission.
See pros in San FranciscoOriginal SF doorways shift on steep-slope foundations, so providers re-hang, adjust, and weatherproof doors that stick or no longer latch in older homes.
See pros in San FranciscoRough framing and wall framing by a licensed carpenter: new partitions, additions, garage conversions and structural walls built to plan and ready for inspection.
See pros in San FranciscoTrust and answers
What backs the work, who is licensed and insured, what customers say, and your questions.
Backed by your provider’s warranty. If covered work fails, your provider makes it right, free.
San Francisco homeowners
Floor Joist Sistering & Subfloor Replacement reviews in San Francisco
Verified floor joist sistering & subfloor replacement reviews from San Francisco homeowners will appear here.
Be the first floor joist sistering & subfloor replacement review in San Francisco
Your pro backs the work with a workmanship warranty — if covered work is not right, your pro makes it right, free. Book with confidence and tell San Francisco how your pro did.
Book Floor Joist Sistering & Subfloor Replacement in San FranciscoFrequently asked