The knob and tube wiring replacement cost for a West Hollywood home usually depends less on the wire itself and more on the building wrapped around it. In the Norma Triangle, along the side streets off Santa Monica Boulevard, and in older courtyard apartment buildings across the city, a lot of homes went up during the decades when knob and tube was the standard way to wire a house.
Many of those buildings still have original circuits hiding behind lath and plaster, often spliced into newer wiring by someone decades ago. This guide breaks down what you can realistically expect to pay, what pushes the number up or down, and how our licensed West Hollywood electricians approach the job so there are fewer surprises once the walls are open.
Key Takeaways
- HomeGuide puts a full knob and tube replacement at $12,000 to $35,000 nationally.
- Angi reports an average near $24,300, with most projects landing between $12,000 and $36,600.
- Plaster walls, tight attics, and live circuits push West Hollywood rewiring costs higher.
- Electricians Service Team replacement starts from $4,500; full homes typically take 3 to 7 days.
- West Hollywood requires an electrical permit through its own Building and Safety Division, not LADBS.
- Fuse boxes often need replacing too; HomeGuide lists new panels at $800 to $2,500.
- Qualifying customers can spread the cost with 0% APR financing for up to 18 months.
What Knob and Tube Wiring Is and Why It Is Still Around
Knob and tube is the earliest form of residential wiring in North America. According to InterNACHI, the home inspector association, it was in common use from about 1880 into the 1940s. Single conductors run separately through ceramic tubes in the framing and are held off the wood by ceramic knobs, so the wire can shed heat into open air.
The system was a sound design for its era. The trouble is that it was built for a household with a few lights and maybe a radio, not for microwaves, window AC units, gaming PCs, and a laundry room. It also has no ground wire, which is why so many older West Hollywood homes still have two-prong outlets or three-prong outlets that are not actually grounded.
Why It Lingers in West Hollywood
A lot of the city’s charm comes from its age. Norma Triangle bungalows, small duplexes, and older walk-up apartment buildings near the Santa Monica Boulevard corridor were often wired once and then patched for decades. Owners added circuits for kitchens or bathrooms with modern cable while leaving the original runs in the bedrooms, hallways, and ceilings.
When we open up these homes, it is common to find a mix of three or four wiring generations in one building. That mix is exactly what makes pricing a rewire tricky, and it is why a real on-site inspection matters more than any online calculator.
Why Knob and Tube Is a Safety Problem Today
InterNACHI notes that knob and tube is not dangerous simply because it is old, but its age and the way it has been treated over the years create real risks. The main concerns electricians see are:
- No ground: there is no grounding path, so surge protection and three-prong appliances do not get the protection they were designed for.
- Brittle insulation: the cloth and rubber coatings dry out and crack, especially where the wire bends or has been disturbed.
- Insulation contact: the wires were meant to cool in open air, and blown-in or batt insulation packed around them traps heat.
- Bad splices: amateur connections between old and new wiring are far more common in these systems, sometimes wrapped in tape that was never meant for electrical work.
- Oversized fuses: when a fuse keeps blowing, someone may swap in a larger one, which lets the wire run hotter than it should.
Wiring failures are not a small problem nationally. The U.S. Fire Administration report on residential electrical fires estimated about 24,000 residential building electrical fires per year from 2014 to 2016, causing an estimated 310 deaths, 850 injuries, and $871 million in property loss annually. Electrical wire and cable insulation was the item first ignited in about 31 percent of those fires.
The Insurance Side, Briefly
Insurance is often what sends homeowners looking up the cost to remove knob and tube wiring in the first place. InterNACHI also points out that many insurers decline to cover homes with active knob and tube, though some will accept it if an electrical contractor certifies the system as safe. Policies vary widely, so check with your carrier before you plan around a partial or full rewire.
Typical Knob and Tube Wiring Replacement Cost Ranges
National cost guides give a useful starting point, though West Hollywood labor rates and older construction tend to push real quotes toward the middle or upper end of these ranges.
- HomeGuide puts the cost to replace knob and tube wiring at $12,000 to $35,000, or roughly $8 to $17 per square foot. By its figures, a 1,000 square foot home runs about $8,000 to $17,000, and a 1,500 square foot home about $12,000 to $25,500.
- Angi reports an average of about $24,300, with most homeowners paying between $12,000 and $36,600, or around $10 to $20 per square foot.
- Electricians Service Team’s knob and tube wiring replacement service starts from $4,500, with a full-house job typically taking 3 to 7 days.
That starting price reflects smaller or more accessible jobs, such as a compact unit, a partial rewire, or a home where only a handful of original circuits are still active. A whole-home rewire of a larger plaster-walled house will land well above it, and an honest contractor will tell you that up front.
What Drives the Cost of Replacing Knob and Tube Wiring
Two homes with the same square footage can get very different quotes. These are the factors that move the number most in older West Hollywood properties.
How Much of the System Is Still Active
Some homes have already had most circuits replaced, with only a few original runs left in bedrooms or ceilings. Others are almost entirely original. The first job on any estimate is tracing which circuits are live and which are abandoned, because dead knob and tube can often be left in place while live runs must be replaced.
Plaster Versus Drywall Walls
Most of the older homes we work in have lath and plaster, which is harder to cut and patch cleanly than drywall. HomeGuide lists plastering at roughly $2 to $10 per square foot for walls and drywall patches at $50 to $400 each, according to its cost breakdown. Plaster is one of the biggest swing factors in knob and tube wiring replacement cost, and careful fishing techniques reduce openings, but some patching is almost always part of the job.
Attic and Crawlspace Access
Raised-floor bungalows with a usable crawlspace and a walkable attic are the easiest to rewire, because new cable can be run from above and below with small openings. Low attics, slab sections from later additions, and finished ceilings with no access all add labor hours.
Full Versus Partial Rewire
A partial rewire that replaces only the remaining live knob and tube circuits costs less up front. A full rewire costs more but gives you a clean, grounded, documented system, which is easier to insure, inspect, and sell. Many owners choose full replacement once they see how much patching a partial job still requires.
Panel or Fuse Box Upgrade
Homes with original knob and tube often still have a fuse box or an undersized panel. HomeGuide lists a new panel at about $800 to $2,500, and Angi puts panel upgrades at $600 to $4,000. If yours needs replacing, our electric panel upgrade service starts from $850 and can be scheduled alongside the rewire.
To make these moving parts easier to compare, the table below pulls the main line items together with the source for each range. Use it to sanity-check the structure of any quote you receive, not as a fixed price for your home.
| Cost Component | Typical Range | Source |
|---|---|---|
| Full rewire, priced by home size | $8 to $17 per sq ft | HomeGuide |
| Typical full project range | $12,000 to $36,600 | Angi |
| Fuse box to modern panel | $800 to $2,500 | HomeGuide |
| Plaster wall repair after fishing wire | $2 to $10 per sq ft | HomeGuide |
| Permits | $200 to $900 | HomeGuide |
| Electricians Service Team starting price | From $4,500 | Company pricing |
Notice that the wire itself is only part of the picture. Labor, wall repair, and the panel can easily account for more of the total than the cable, which is why two bids for the same house can look so different on paper.
West Hollywood Factors: Permits, Tenants, and Older Buildings
Permits Through West Hollywood Building and Safety
West Hollywood is its own city, so permits go through the City of West Hollywood Building and Safety Division, not the Los Angeles Department of Building and Safety. The city’s code requires an electrical permit before installing, altering, or repairing wiring, with exemptions only for minor items like swapping a switch or receptacle. Inspections are scheduled through the city’s online Permit and License Portal.
HomeGuide estimates permits at $200 to $900 nationally, but the actual West Hollywood fee depends on the scope. A licensed contractor should pull the permit and include it in the quote, and the walls should stay open until the rough inspection is signed off.
Multi-Unit Buildings and Tenant Coordination
West Hollywood is largely a renter’s city. U.S. Census QuickFacts puts the owner-occupied housing rate at 20.5 percent for 2019 to 2023, which means many rewiring projects happen in occupied rental buildings. That changes the job: power shutoffs must be scheduled, units must be accessible, and work often has to move unit by unit.
Building owners should plan for tenant notice, staged scheduling, and daily cleanup in occupied units. Coordinating these steps adds time, so ask your contractor how they handle phased work before the start date is set.
Knowing how each line item affects the knob and tube wiring replacement cost makes bids far easier to compare. Before you compare numbers, it helps to know what a complete estimate should actually cover. As our electrician Razmik puts it,
“The cheapest quote is rarely the cheapest job. Make sure your electrician has actually been in the attic and under the floor, has traced which old circuits are still live, and has written the permit, the panel work, and the wall repair into the price before you sign anything.”
Razmik, Electricians Service Team
How to Read a Knob and Tube Replacement Quote
A good quote is detailed enough that you could hand it to another electrician and get an apples-to-apples price. Look for these items:
- Scope: full or partial rewire, and exactly which rooms or circuits are included.
- Device count: the number of outlets, switches, and fixtures being replaced or added.
- Panel work: whether the fuse box or panel is being replaced, and the new amperage.
- Code items: grounding, GFCI and AFCI protection where required, and smoke alarm circuits.
- Wall repair: whether patching is included, and if it is rough patch only or finished and ready for paint.
- Permit and inspection: who pulls the permit and whether the fee is in the price.
- Timeline and power plan: expected days on site and how long the home will be without power.
If one bid is far lower than the others, compare it line by line. Often it leaves out patching, the panel, or the permit, and those costs show up later as change orders.
Process, Timeline, and When the Job Gets Bigger
A typical project starts with an inspection and circuit tracing, then a written quote, permit application, rough wiring, city inspection, wall patching, and final inspection. For a full house, our crews typically need 3 to 7 days of on-site work, depending on size and access.
Jobs grow when the walls reveal more than the inspection could. Common surprises in older West Hollywood buildings include:
- Live knob and tube buried under attic insulation that has to be cleared before work can continue.
- Heat-damaged or brittle wire at old splice points, which may extend the scope to additional circuits.
- Undersized service or a panel that cannot handle the new circuits.
- Previous unpermitted work that the city inspector will want corrected.
A thorough upfront inspection catches most of these, and a good contractor will explain how any extra work is priced before it starts.
Why DIY Is Not a Good Fit for This Job
Replacing knob and tube wiring is not a weekend project. It involves working inside live and old circuits, identifying hidden splices, sizing new circuits and the panel correctly, and meeting current code for grounding and protection. Mistakes can create fire and shock hazards that stay hidden behind the walls.
The permit and inspection process also matters for resale and insurance. A permitted rewire by a licensed C-10 contractor gives you documentation that the work meets code, which a DIY job cannot easily provide.
Ways to Manage the Cost for Rewiring an Old House
The cost for rewiring an old house is a big number, but there are practical ways to keep it under control:
- Bundle work: replace the panel and rewire at the same time so you pay for one permit cycle and one round of wall openings.
- Plan around remodels: if you are already opening walls for a kitchen or bathroom, rewire those areas then.
- Phase carefully: in some homes, replacing the live circuits first and finishing the rest later can make sense, as long as safety issues are handled right away.
- Use financing: Electricians Service Team offers 0% APR options for up to 18 months for qualifying customers.
- Add upgrades while walls are open: extra outlets or dedicated circuits through our home wiring services cost less now than later.
Replacing knob and tube wiring is one of the few home upgrades that improves safety, insurability, and everyday usability at once. Treat it as a long-term investment in the building rather than a repair.
Getting a Knob and Tube Quote in West Hollywood
Every older home is different, so the most reliable knob and tube wiring replacement cost figure comes from someone walking your attic, crawlspace, and panel in person. Our team can trace what is still live, explain your full and partial options, and handle the permit with West Hollywood Building and Safety from start to finish.
If you own a Norma Triangle bungalow, a duplex, or an older apartment building, reach out to our West Hollywood electrical team to schedule an inspection and get a written, itemized quote. You can also learn more about our electrician services in West Hollywood and how we work with owners and tenants in occupied buildings.
