San Francisco and the East Bay
Knob and tube wiring guides
Guides
Plain answers about knob and tube wiring in San Francisco and East Bay buildings, from how the system works to what a replacement costs and how it is permitted. Fog City SF Knob and Tube manages each job; the electrical work is carried out by licensed and insured electrical contractors.
Where
San Francisco and the East Bay: Berkeley, Oakland, Alameda and Piedmont.
Service
Knob and tube replacement
- LearnWhat is knob and tube wiring?How the original electrical system in older San Francisco houses works, what it did well, where it falls short and what the rules say now.
- Decision GuideCan I replace knob and tube myself?Who San Francisco lets do their own electrical work, what the homeowner permit commits you to, why this site gives no wiring instructions, and the useful parts of the job an owner can take on.
- LearnHow long does it take to replace knob and tube wiring?The wiring is only one part of the calendar. What sets each stage, which waits come from public rules, and what you can do to keep the job moving.
- LearnHow to replace knob and tube wiring: what the work involvesThe order a replacement runs in, from the first circuit test to the Green Tag, what goes in the walls instead, and what to do to get the house ready.
- LearnIs knob and tube wiring legal in California?Existing knob and tube is allowed. Extending it, burying it in insulation and leaving dead runs unmarked are not. Here is where the lines fall, statewide and city by city.
- Cost GuideIs there a knob and tube rebate in the Bay Area?One regional program pays toward knob and tube work, and only as part of an energy upgrade. Here is what it pays, who qualifies and what the paperwork needs.
- Cost GuideHow much does knob and tube replacement cost in San Francisco?The ranges, what moves a house within them, and the parts of the price that come from public figures.
- LearnHow does a San Francisco electrical permit work for rewiring?Who can file, what DBI charges, what each inspection checks, and why a Green Tag on its own does not prove the knob and tube is gone.
- Decision GuideWill electricians work on knob and tube wiring?What electricians will and will not do with old wiring, the friction homeowners report when hiring, and how to check that a contractor can legally do the work in San Francisco.
Service
Whole-house rewiring
- LearnWhat is the amp rating of knob and tube wiring?Why there is no number printed on the wire, what really sets a knob and tube circuit's capacity, and what changes when modern loads land on it.
- Decision GuideWhat are the signs your house needs rewiring?A symptom-first way to sort what you are seeing, for owners who are not sure what wiring they have, with what each sign can and cannot tell you.
- Decision GuideWhat should a rewiring quote include?The lines that make two knob and tube rewiring quotes comparable, what each one tells you, and the gaps that turn into surprises later.
- LearnWhat replaced knob and tube wiring?The wiring methods that followed knob and tube, what a rewire installs today, and the San Francisco code amendments that decide which one goes where.
Service
Knob and tube inspection
- Decision GuideShould you buy a house with knob and tube wiring?Plenty of San Francisco buyers do. The ones who come out ahead settle insurance, test the wiring and price the work before their contingencies run out.
- LearnHow to identify knob and tube wiringWhat the porcelain, the wires and the splices look like, where to look in a San Francisco house without touching anything, and which clues mislead.
- LearnIs knob and tube wiring dangerous?The danger sits in what has happened to the wiring since it went in. Here is how each failure works, and which signs mean stop using a circuit today.
- Decision GuideCan you sell a house with knob and tube wiring?The law asks sellers for an advisory, not a rewire. The buyer's insurer is what sets the terms, and the records you bring decide how that conversation goes.
- Decision GuideCan knob and tube wiring be repaired?Where a repair is honest and permitted, where it turns into an extension or a replacement, and how insurers and the insulation rules change the math.
- LearnCan you add GFCI or AFCI protection to knob and tube wiring?What ground-fault and arc-fault devices actually detect, why they behave differently on old circuits, and where they fit next to replacement.
- Decision GuideCan you replace a light fixture on knob and tube wiring?Why a fixture, fan or switch swap on old wiring so often turns into more, what an electrician looks for at the ceiling, and when the answer is a new circuit.
Service
Plaster-wall rewiring
- Decision GuideCan you live in a house while rewiring is under way?How an occupied rewire is sequenced, what a day without power in some rooms looks like, and when it is better to be somewhere else.
- Decision GuideDo electricians patch walls after rewiring?Who closes the openings after a rewire, what the word patch can mean in a quote, and why plaster, lead-safe rules and the inspection schedule shape the answer.
- LearnDoes knob and tube wiring have asbestos?What the wiring itself is made of, which materials around it deserve a test before anyone cuts, and how lead-safe rules change the way openings are made and patched.
Service
Apartment building rewiring
- Decision GuideWhat does rewiring a condo or TIC unit in San Francisco involve?Why one unit's wiring is rarely only one unit's business, what DBI requires per unit, and what to settle with the other owners before work starts.
- Decision GuideWhat does rewiring a rental property in San Francisco involve?The landlord's side of a knob and tube job: permits unit by unit, working around tenants, the Rent Board's relocation rules and what a capital improvement petition can and cannot do.
Want it answered for your house?
Call or send a request with the age of the house and what prompted the question.
Send a request
2141 Mission St
San Francisco, CA 94110
office@fogcitysfknobandtube.com
Tell us where the house is, when it was built and what prompted the question: an insurer, a sale, a remodel or an attic. The walk-through is planned around it.
Fog City SF Knob and Tube2141 Mission St
San Francisco, CA 94110
office@fogcitysfknobandtube.com