In San Francisco, only in a narrow case: you must own a stand-alone single-family home that is your primary residence, take out a DBI homeowner electrical permit, and do all of the work yourself. Owners of flats, rentals or property held by an LLC do not qualify, and the inspector at the Permit Center can still tell you to hire a licensed contractor. For most owners, the practical answer is no.
Fog City SF Knob and Tube manages knob and tube replacement for owners across San Francisco and the East Bay, and the electrical work is carried out by licensed and insured California C-10 electrical contractors. This guide explains who can do their own electrical work, what the homeowner permit commits you to, why it gives no wiring instructions, and what an owner can usefully do instead.
Who San Francisco lets do their own electrical work
San Francisco’s electrical code allows DBI to issue a permit for electrical work in or about a single-family dwelling to a homeowner, “provided the work to be done will be performed by the homeowner.” DBI’s own guidance narrows it further: only owners of stand-alone single-family dwellings, R-3 occupancy, may apply to do the work themselves, and homeowner permits are limited to single-family homes that are the owner’s primary residence. The code adds that “LLC’s are not eligible for an Electrical Homeowner’s Permit.”
So the homeowner route is closed if you own:
- a flat or unit in a two-, three- or four-unit building
- a condo or TIC share, even one you live in
- a rental property, including a single-family house you rent out
- a property held in an LLC
To apply, a qualifying owner talks to an inspector at the Permit Center at 49 South Van Ness, who may tell you to hire a licensed contractor instead. For everyone else, DBI issues electrical permits to contractors registered with the city who hold one of the license classifications it lists, the C-10 electrical license covering any electrical work. The San Francisco electrical permit guide covers the full process.
What the homeowner permit commits you to
The permit is not a shortcut. On DBI’s homeowner electrical permit application, the owner declares, “I will not hire a contractor to perform the electrical work authorized under this permit.” The application also states that “All electrical wiring shall remain exposed until approved for cover by the electrical inspector.” The code requires a pre-cover inspection before anything is concealed and a final inspection with the work operating, and power is connected only after DBI issues the Certificate to Connect Current, the Green Tag.
If the work does not comply, the code says it must be corrected by a state-licensed electrical contractor under a separate permit. The same standards apply to an owner’s work as to a contractor’s: arc-fault protection where CEC 210.12 requires it, ground-fault protection where CEC 210.8 lists it, tamper-resistant receptacles under CEC 406.12, and San Francisco’s own rules on where nonmetallic cable may run and how exposed wiring under 8 feet is protected.
You also cannot hand pieces of it to helpers for pay. In California, people working as electricians for a C-10 contractor must hold state electrician certification under Labor Code 108, and a handyman working under your homeowner permit is not working for a licensed contractor at all.
Why this guide gives no wiring instructions
Replacing knob and tube is not a matter of pulling new wire through old holes, and several of its hazards defeat ordinary household caution:
- Off may not mean dead. Shared neutrals and switches wired in the neutral can leave a circuit or fixture energized with its fuse, breaker or switch off. The knob and tube mixed with Romex guide explains how.
- The insulation fails when handled. Rubber insulation that has hardened for a century can crack the moment a conductor is moved, which is why the identification guide says not to handle suspect wiring at all.
- Live runs look abandoned. Runs that seem disconnected are sometimes still energized from another circuit. Only testing separates them, as the active vs abandoned guide explains.
- Walls hold lead paint. DBI presumes buildings built before 1979 contain lead paint unless a certified inspector shows otherwise, so every opening raises lead-safe requirements.
- The work has to be designed. Circuit layout, load calculation, panel capacity and code-required protection are decisions, not just labor.
That is why this site explains what the work involves without step-by-step instructions for opening, splicing or energized electrical work.
What unpermitted work can cost
Skipping the permit carries its own price. DBI’s penalty for work without a permit is an investigation fee of nine times the permit issuance fee plus the original permit fee. DBI can order concealed, uninspected work exposed at the owner’s expense. And unpermitted wiring tends to come up later: insurers ask about it, and on or after January 1, 2026, California Civil Code 1102.6i requires sellers or their agents to tell buyers it may be advisable to have the electrical system inspected.
Homeowners report hesitating over a permit because they fear an inspector will raise other unpermitted work in the house, such as a basement bathroom. No DBI guidance on how inspectors treat unrelated work during an electrical permit was found, so that is a question to raise directly rather than a reason to go without.
Rather have it done properly the first time?
Testing comes first. The written scope that follows lists each opening and who closes it, so you can weigh the work against doing it yourself.
In the East Bay
Owner-permit rules are set by each city. Oakland issues permits to a California-licensed contractor with an appropriate classification and a current Oakland Business Tax Certificate, or to the owner or someone legally acting for the owner; see Oakland. In Alameda, the Building Official states that knob and tube cannot be extended, though existing wiring may be repaired or re-energized; see Alameda. For Berkeley, Piedmont and the smaller cities, who may pull an electrical permit is confirmed per address.
What an owner can do instead
Doing the wiring yourself is rarely where an owner saves the most. These parts of a project are yours to take on, none of them involving the wiring itself:
- Gather the history. The age of the house, known remodels, any panel or service changes, past inspection reports and insurer letters all shorten the walk-through.
- Note what you have seen. Write down which rooms trip or blow fuses, where outlets run warm, where you have seen porcelain knobs. The risk assessment tool helps you sort it.
- Clear access. Open up the attic hatch, basement walls, garage ceiling and closets that back onto framing, so routes can be checked and used.
- Decide early. Settle added circuits, outlet locations and any panel work before the permit is filed, so the scope does not change midstream.
- Plan the finish work. Patching is included in a Fog City SF Knob and Tube quote as its own line; paint is a separate decision you may prefer to handle. The patching guide explains finish levels and lead-safe rules.
- Handle the paperwork. If you qualify for BayREN’s EASE Home program, the contractors supply the electrician’s invoice or inactivity certification and the company helps with the rebate paperwork; the rebate guide has the conditions.
- Live safely with it meanwhile. Keep heavy loads off old circuits, never upsize a fuse, and do not add insulation over knob and tube without the certification California requires.
Making the call
If you qualify for a homeowner permit and are weighing it, talk to the Permit Center first, and be realistic about testing, design, inspection and lead-safe work as well as the wiring. If you do not qualify, the question becomes how to scope the job well; the replacement process guide shows what happens at each stage, and the cost estimator gives a first number. If you would rather hand the work over, call (628) 296-7628 or request an estimate.