Licensed Master Electrician-Led Rewiring for San Antonio’s Older Homes
If your San Antonio home was built before the early 1950s, there’s a real chance it still has knob and tube wiring running through its walls and attic. Replacing that legacy system is a distinct job from a standard rewiring project. It requires tracing a century-old configuration, coordinating permits with the city, and often addressing the panel at the same time. Absolute Power Electrical Contractors has handled residential wiring in San Antonio since 2005 under the direction of George Salinas, a licensed Master Electrician and State of Texas licensed Electrical Contractor. We’re a family-owned team, and this is the kind of project we’re built for.
We serve homeowners throughout Bexar, Kendall, Comal, and Guadalupe counties. Free estimates are available, along with same-day appointments and 24/7 emergency services.
Not sure whether your home has knob-and-tube wiring? Call us at (210) 981-6868 and we can schedule a free estimate to inspect your wiring and give you a straight answer.
How to Identify Knob & Tube Wiring in Your Home
The most direct sign is visible hardware in the attic or accessible framing: ceramic knobs anchoring individual wires to joists, and ceramic tubes where wires pass through wood. If your home predates 1955, those components may still be present and active. Two-prong ungrounded outlets throughout the house are another common indicator, since the system carries no ground wire by design.
Functional symptoms can also point to legacy wiring. Frequent breaker trips, flickering lights, burning smells near outlets, and discolored switch or outlet covers all warrant an inspection. Unlike modern NM cable, which bundles conductors in a single plastic sheath, knob and tube wiring routes the hot and neutral wires separately, making it visually distinctive once you know what you’re looking at.
Why San Antonio Homeowners Replace Knob & Tube Wiring
Three concerns drive most replacement decisions.
No Grounding Conductor
Knob and tube wiring has no ground wire. Without one, modern appliances, GFCI outlets, and surge protection devices can’t function as designed, and fault risk increases.
Insufficient Capacity for Modern Loads
These systems were built for loads as low as 60 amps. Most households today require 100 amps or more to run modern appliances, HVAC systems, and electronics safely.
Insurance & Code Compliance
Many carriers raise premiums or decline to cover homes with active knob-and-tube wiring because of its risk profile. If your insurer has flagged this, or you’re planning to sell, active legacy wiring is likely to come up. Check with your insurer for specifics on your policy. Beyond insurability, the cloth and rubber insulation on original wiring deteriorates with age, and decades of modifications by previous owners can accelerate that breakdown. Active knob and tube wiring doesn’t meet current National Electrical Code requirements, and any modifications or extensions must comply with current code.
Why San Antonio Homeowners Choose Absolute Power Electrical Contractors
George Salinas has held his Master Electrician license since 2005 and built Absolute Power Electrical Contractors from the ground up into a team of more than 50 professionals. Genaro Salinas, our operations manager, coordinates project scheduling and works to ensure every job meets OSHA safety standards. Our apprentices complete formal electrical schooling alongside hands-on training before working independently.
We hold an A+ rating from the Better Business Bureau and a 5.0 average on Angi’s List. Our pricing is upfront: free estimates before any work begins, with no surprises when the invoice arrives. Our technicians bring their own cleaning equipment, including vacuums, and leave your home the way they found it. We walk you through every stage of the project before we start and stay available for questions throughout.
What to Expect During Knob & Tube Replacement
Every project begins with a detailed inspection to map how extensively knob-and-tube wiring runs through the home. Older San Antonio neighborhoods like Alamo Heights and King William often have unique construction layouts that require extra care when routing new circuits through attic and wall cavities. We work to minimize wall openings wherever the layout allows.
Depending on code requirements and the condition of the existing system, older components may be de-energized and left in place while new circuits take over, or full removal may be required. We handle all permitting through San Antonio’s Development Services Department, so you don’t have to track paperwork or navigate compliance steps. City inspectors review the work before circuits are re-energized, and we can keep you informed at every stage: when power will be off, how long each phase takes, and what to expect before it happens.
Panel Upgrades Alongside Knob & Tube Replacement
Homes with knob-and-tube wiring frequently have 60-amp service panels installed at the same time as the original wiring. Replacing the wiring without addressing an undersized panel means new circuits still run through an inadequate service entrance. During the same inspection visit, we can assess whether a panel upgrade is needed and, if so, schedule both services together. Combining them reduces the total number of visits and keeps your project on a single coordinated timeline.
Absolute Advantage Membership
Once your knob and tube wiring is replaced, ongoing maintenance can help protect that investment. Our Absolute Advantage Membership gives members priority scheduling, a free annual safety inspection, service discounts, and reduced emergency trip charges. It’s a practical way to stay ahead of issues before they become bigger problems.
Schedule Your Free Estimate for Knob & Tube Replacement
If you think your home may have legacy wiring, the right move is an inspection. We can assess the full extent of the system, explain your options clearly, and provide a free estimate with no obligation. Same-day appointments are available for homeowners who need answers quickly.
Knob and tube wiring was the standard installation method in American homes from roughly the 1880s through the 1940s, with some installations continuing into the early 1950s. It routes hot and neutral conductors as separate wires, each anchored by ceramic knobs along the framing and protected by ceramic tubes where the wire passes through wood. The insulation is cloth or rubber, not the plastic sheathing used in modern wiring, and it includes no grounding conductor, which current code requires for most circuits. Modern NM cable bundles all conductors, including a ground wire, inside a single plastic-sheathed cable rated for higher electrical loads. You may see it called “knob-and-tube” in contractor documentation and insurance paperwork. Both terms refer to the same system.
Permits & Inspections for Knob & Tube Replacement in San Antonio
Most knob and tube replacement projects in San Antonio require a permit through the city’s Development Services Department. A city inspector reviews and approves the work before walls are closed and circuits are re-energized. Skipping this step can result in failed inspections, required tear-outs, and complications with your homeowner’s insurance coverage.
Absolute Power Electrical Contractors handles all permitting and inspection coordination directly. We stay current on San Antonio code updates and work with inspectors throughout the process, so the permit side of the project never falls to you.
Frequently Asked Questions
How Do I Know for Certain Whether My Home Has Knob & Tube Wiring?
A licensed electrician can inspect the attic, basement, and accessible wall cavities to identify the wiring type and confirm how far the system extends. Visual signs in accessible spaces are a strong indicator, but a formal inspection gives you a definitive answer.
Does Knob & Tube Wiring Have to Be Fully Removed?
Not always. In many cases, older components are de-energized and left in place while new circuits take over. Whether full removal is required depends on current code requirements and the condition of the existing wiring.
Will Replacing Knob & Tube Wiring Affect My Homeowner’s Insurance?
Many carriers treat active knob-and-tube wiring as a risk factor that raises premiums or affects coverage. Replacing it may help resolve those complications, but policy terms vary. Consult your insurer directly for specifics on your situation.
How Long Does Knob & Tube Replacement Take?
The timeline varies based on home size and how extensively the legacy wiring is distributed throughout the structure. An inspection can give a more accurate estimate for your specific home.
Is a Panel Upgrade Required When Replacing Knob & Tube Wiring?
Not automatically. Homes with knob-and-tube systems often have undersized 60-amp panels installed at the same time as the original wiring, but the inspection will determine whether a panel upgrade is needed alongside the replacement.
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Neat Work. Prompt service. Took longer than expected but work was done patiently and very nicely. Problems that were created by the work were promptly addressed.
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Days leading up to work they called to confirm my needs and requests were being met and to confirm our appointment. They showed up early for the appointment, and allowed me to throw on some extra work before they left.
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They were on time, professional and no pressure in the estimation of work I asked about. They are also working an estimate for our kitchen for lighting as we take on an additional project very soon.
