Knob & Tube Replacement in Orlando

What Knob & Tube Wiring Is & Why It’s a Problem

Knob and tube wiring was the standard installation method in homes built roughly before 1950. The system uses ceramic knobs to anchor wires along framing and ceramic tubes where wires pass through joists and studs. It has no ground wire and relies on open air space to dissipate heat. That design was adequate for the electrical demands of the early 20th century. It isn’t adequate now.

The cloth and rubber insulation used in these systems deteriorates over decades, exposing live conductors. The wiring was never designed to carry the load of modern HVAC systems, appliances, or electronics. Beyond the safety concerns, many Florida insurers won’t issue or renew homeowner’s insurance on homes with active knob and tube circuits, and those that do often charge significantly higher premiums. A four-point inspection, which many Florida insurers require before issuing policies on older homes, commonly flags active knob and tube wiring as a condition requiring remediation.

Warning Signs in Your Older Home

Some homeowners don’t know whether their home still has active knob and tube circuits. These are common indicators worth investigating:

• Pre-1950 construction with no documented full electrical upgrade
• Visible ceramic knobs or tubes in the attic, basement, or crawl space
• Frequent tripped breakers or blown fuses when multiple appliances run at the same time
• Flickering or dimming lights when a large appliance turns on
• Burning smell or discoloration near outlets or switches
• Two-prong ungrounded outlets throughout the home
• Insurer flagged the wiring or increased premiums or denied coverage

Any one of these warrants a professional inspection. Several together make replacement a priority.

What to Expect from the Replacement Process

Replacement starts with a thorough assessment of which circuits are still active and how extensively the system runs through the home. From there, we pull the required electrical permits through the City of Orlando or Orange County before any work begins, and our team coordinates all required inspections.

Our electricians replace knob and tube circuits with modern NM cable or conduit, install proper grounding throughout, and bring the electrical system into compliance with current Florida electrical code. All work is inspected and certified before the project closes. Depending on the size of the home and the scope of the system, full replacement can take several days. For homes with mixed-age wiring, partial replacement of specific circuits or rooms is also an option.