How much does a whole-house rewire cost in Richmond or San Pablo?

A 1,500 sqft three-bedroom, two-bath in west Contra Costa runs around $22,000 in 2026 if the family relocates to a short-term rental during work. If the family stays in the house, it runs $24,000–$26,000 because work is slower around furniture and occupied rooms. A 2,000+ sqft or two-story home scales to $28,000–$38,000 — outlet count matters more than square footage. A partial rewire covering kitchen and baths only runs $8,000–$14,000 and can buy years if the bedrooms read modern on the walk-through. Prices do not include drywall patch, paint, or flooring restoration.

What is knob-and-tube wiring?

Knob-and-tube was the standard residential wiring method from about 1880 through the early 1940s. Two separate copper conductors — one hot, one neutral — held apart from structural wood by ceramic knobs, and passed through studs and joists inside ceramic tubes. No ground wire, no jacket, no modern conduit. Just two bare conductors running four to six inches apart, insulated only by air and their own cloth-and-rubber coating. It was designed for 1930s loads (lamps, radios, a refrigerator) and is running at loads it was never designed for in 2026.

Is old cloth-wrapped romex the same as knob-and-tube?

No. Knob-and-tube has two separate conductors with no ground and no jacket. Early romex (1950s–1960s) has both conductors in a shared cloth jacket but still often has no ground, and the cloth insulation has usually deteriorated. Modern romex (post-1970s) is the plastic-jacketed yellow or white NM-B most people picture. Early-era cloth romex without a ground wire is not knob-and-tube, but it is also not up to modern code for most circuits — and it is the second-most-common reason homeowners call us for a rewire.

How long does a whole-house rewire take?

Three weeks is typical for a 1,500 sqft 3-bed, 2-bath with the family relocated to a short-term rental. Day one is the walk-through, scope, and written quote within 48 hours. Week 0 is permit submission — most west Contra Costa cities turn it around in about a week. Week 1 is rough-in of attic and upper floor. Week 2 is first floor, crawlspace, panel replacement, and the rough inspection at the end of the week. Week 3 is trim-out, drywall patch, final inspection, and the closed permit card you hand to your insurance file.

What do you find behind the walls during a rewire?

Every rewire job has surprises. The three most common on Richmond and San Pablo jobs are: improper splices inside walls (twisted conductors with electrical tape, no box — somebody's weekend project in 1975), active knob-and-tube feeding spaces the homeowner didn't know existed (basement lights, attic receptacles nobody has used in decades), and old fire damage that never got addressed (charred wood around a junction, a scorched stud where a splice ran hot). Most surprises are cosmetic and we keep going. Scope-changing surprises get a stop-work-and-signoff conversation before we move on.

Knob-and-tube rewires in Richmond and San Pablo: what it costs, why insurance won't write policies, and what we find behind the walls

A 1,500 sqft rewire in San Pablo runs $21,000 to $22,000. Here is what knob-and-tube actually is, why it is still live in one in four Richmond homes we walk, and what a full rewire actually replaces.

In one out of every four pre-1950 homes we walk in north Richmond and the Iron Triangle, the original knob-and-tube wiring is still live. Not abandoned in the attic — actively carrying household load in 2026. Most homeowners do not know. Most of the time the system has been running for eighty-plus years without catching fire, and that quiet reliability is what keeps it in the walls.

It is also what the insurance letter is about, when it arrives. Most carriers have stopped writing new policies on homes with active knob-and-tube, and a growing number now non-renew existing policies at the next cycle. If that letter just came in your mail, this post is for you.

What knob-and-tube actually is

Knob-and-tube was the standard residential wiring system from about 1880 through the early 1940s. Two separate copper conductors — one hot, one neutral — held apart from structural wood by ceramic knobs, and passed through studs and joists inside ceramic tubes. No ground. No sheath. No modern conduit. Just two bare conductors running through your walls, four to six inches apart, insulated only by air and their own cloth-and-rubber coating.

In the 1930s it was fine. The loads were lamps, radios, and maybe a refrigerator. In 2026, with microwaves, HVAC, dishwashers, gaming PCs, and a car charger in the garage, the system is running at loads it was never designed for, through insulation that has been deteriorating for eighty years, in a code environment that does not recognize it as an acceptable wiring method for new circuits.

Why west Contra Costa still has so much of it

Three reasons. First, the housing stock. North Richmond and parts of San Pablo have a heavy concentration of pre-war homes — 1910s through early 1940s — that were wired knob-and-tube on the first build and never fully rewired after. Second, the California climate. Cold and dry is hard on insulation; the Bay Area is neither. Knob-and-tube that would have rotted out in a Chicago basement is still readable in a Richmond attic. Third, the money. A full rewire is a twenty-thousand-dollar decision, and a lot of homeowners kept kicking the can for twenty years because the lights still worked.

What we see most often now is a partial rewire — some previous owner rewired the kitchen and the bathrooms when they remodeled, added romex to the bedrooms when they put in ceiling fans, but left the original branch circuits to the living room, dining room, and the second floor completely untouched. The house shows modern outlets on the walls. The wire behind those outlets is 1930s knob-and-tube.

A real San Pablo job

Job file

San Pablo 1,500 sqft · 3 bed · 2 bath

Whole-house rewire, 1940s tract, live knob-and-tube in attic + cloth-wrapped branch circuits

$21,000

Family lived in a short-term rental for three weeks. We pulled all the K&T out of the attic, ran new romex to every outlet and switch in the occupied space, swapped the old Federal Pacific panel for a new 200A main, added a subpanel for kitchen and laundry loads. Permit pulled with City of San Pablo — closed in a week. Rough and final both passed first walk.

Full rewire pricing — what the number depends on

Whole-house rewire pricing in west Contra Costa hinges on three variables: square footage, whether the family stays in the house during work, and what we find when we start opening walls.

Pricing we see

Whole-house rewire — west Contra Costa 2026

Real jobs we have done or quoted in the last six months.

1,500 sqft · 3/2 · family relocates to rental Benchmark. Matches the San Pablo job above
~$22,000
1,500 sqft · 3/2 · family stays in the home Slower work around furniture, protected floors, occupied rooms
$24,000–$26,000
2,000+ sqft · more rooms / second story Scales with outlet count, not just square feet. Two-story homes add vertical runs
$28,000–$38,000
Partial rewire — kitchen + baths only Can buy you years if the bedrooms read modern on the walk-through
$8,000–$14,000

Prices do NOT include drywall patch, paint, or flooring restoration. We leave a clean work area but we do not finish it — a separate trade handles that.

The insurance problem

If your homeowners insurance carrier has flagged knob-and-tube, the options are limited and none of them involve ignoring the letter. Most carriers will not write a policy on an active K&T system. A small number will, usually with a significant premium and an explicit exclusion on any electrical-caused fire claim. Most will non-renew at the next cycle unless the system is replaced.

The fix is a documented rewire with a closed permit and a copy of the permit card. That is the paperwork your carrier wants to see. It is what we hand you when we finish — not a handshake, not a note, a city-stamped card that says the work was inspected and signed off by the jurisdiction.

What insurance carriers actually want

Active knob-and-tube removed from occupied spaces Carriers will often accept K&T in a detached garage or a truly unoccupied attic. The kitchen is a different story.
New wiring on permit, with a signed inspection card Handyman work on the cheap does not count. They want the city sign-off in writing.
Panel capacity appropriate to the service A 60-amp Federal Pacific with modern romex added on is still a denied policy. The panel usually has to come out too.
Modern grounding throughout the rewired circuits K&T had no ground. Every replacement circuit has to have one — and the grounding electrode at the panel has to match code.

What we find behind the walls

Every rewire job has surprises. We open a wall and find something nobody has thought about in thirty years. Most of the time the surprises are cosmetic and we keep going. Sometimes they change the scope mid-job, and we stop work, tell you what we found, and get your signoff before moving on. Here are the three most common.

Three things we find on almost every Richmond / San Pablo rewire

01
Improper splices inside walls Twisted-together conductors with electrical tape, no box, no cover. It was someone's weekend project in 1975. We have to pull those out and put the splice in a box with a cover plate, accessible per current code.
02
Active knob-and-tube extending into spaces the homeowner did not know existed A previous partial rewire often stopped at the obvious circuits and left live K&T feeding a basement light or an attic receptacle nobody had used in decades. Those show up on the rough-in walk.
03
Fire damage that never got addressed Charred wood around an old junction, a scorched stud where a splice ran too hot for too long. Usually it is ancient and stable now, but the circuit has to be replaced and the area has to be cleaned up before new wire goes near it.

Timeline: what three weeks actually looks like

Timeline

Whole-house rewire

Typical 1,500 sqft · 3-bed · 2-bath · family out of the house.

1

Walk-through + scope Day 1

Open the panel, open an outlet in every area, check attic and crawlspace if accessible. Photos, scope notes, written quote within 48 hours.
2

Permit submission Week 0

Electrical permit pulled with the city. Most west Contra Costa cities turn it around in about a week.
3

Rough-in phase 1: attic + upper floor Week 1

Pull all K&T out of accessible attic runs. Run new romex home-runs to the panel location. Fish walls where needed. Install new boxes.
4

Rough-in phase 2: first floor + crawlspace Week 2

Finish branch circuits to every outlet and switch. Deal with any surprises that came up during phase 1. Terminate everything at the panel.
5

Panel replacement + subpanel Mid-week 2

Old panel out, new 200A main in. Subpanel installed. PG&E scheduled for service cut-over if this is a full service change.
6

Rough inspection End of week 2

City inspector walks the open walls. Nothing closes up until this passes.
7

Trim-out + final inspection Week 3

Outlets, switches, plates, fixtures. Drywall trade patches the openings. Final inspector walk. Permit card closed and handed to you for your insurance file.

Vet the contractor

A whole-house rewire is the single most expensive electrical project most homeowners ever pay for. It is also the one most likely to go sideways if the person running it is not prepared. Three questions will tell you whether the bidder is actually set up to do it.

Ask every rewire bidder

01
When was your last rewire on a pre-war Richmond or San Pablo home? Generic electricians bid these jobs. The ones who have done them before know what to look for behind the walls. If the answer is "never," the learning curve is on your dime.
02
Are you pulling the permit, or am I? The answer should be "we are." Any rewire not done on permit does not satisfy your insurance carrier and does not protect you if the work fails inspection later. If a contractor offers to do the work without a permit to save money, walk away — that quote is not the deal you think it is.
03
What is your CSLB license number and when was it issued? Public record at cslb.ca.gov. Our number is #1062166, class C-10, active and in good standing. Anyone bidding a rewire without a current C-10 is doing work they are not licensed for.

CSLB #1062166 · West Contra Costa

Let us walk the house before the insurance deadline.

Free walk-through. Written scope and quote the same day. Every job on permit under CSLB #1062166.

Request a walkthrough Call 510-850-3941

Knob-and-tube rewires in Richmond and San Pablo.