Knob-and-tube wiring is often out of sight—which is exactly why it gets missed. In many San Francisco homes, the oldest wiring runs through attics, basements, and crawlspaces where access is tight and visibility is limited. An inspection is the fastest way to confirm what’s actually there, identify unsafe modifications, and understand what needs attention before you renovate, sell, or call your insurance company.
This type of wiring was designed for a different era: fewer appliances, lighter loads, and more open air around conductors. Over decades, homes get rewired in pieces, splices are added, insulation is installed, and new circuits are tied into old pathways. During an inspection, we look for conditions that matter in real life—brittle cloth insulation, open junctions, over-fused circuits, ungrounded branches, and signs of overheating where the wiring enters framing or passes through old ceramic tubes.
We also focus on the places homeowners rarely check. Attics can hide buried wiring under insulation. Basements often show mixed-era repairs and abandoned runs. Crawlspaces tend to have moisture exposure, rodent activity, and makeshift connections from past projects. Seeing these areas up close helps us separate “original but stable” from “touched too many times and now risky.”
After the walkthrough, you get practical clarity: where knob-and-tube exists (and where it doesn’t), what hazards are present, and what a sensible next step looks like. If replacement is needed, we can outline options that fit your home and timeline—without pushing unnecessary work.
Why San Francisco Property Owners Trust Our Inspections
An inspection is only useful if it’s thorough, understandable, and based on how older wiring behaves in real homes. Our team specializes in knob-and-tube systems, so we know where it typically runs, how it gets altered over time, and which warning signs deserve immediate attention—especially in tightly packed neighborhoods with decades of remodel history.
We keep the experience straightforward. You’ll get a clear explanation of what we found, why it matters, and what options make sense next—whether that’s targeted corrections, a planned replacement, or documentation for a buyer, contractor, or insurer. No confusing jargon, no pressure, and no “mystery” recommendations.
Homeowners choose us for inspections because we deliver:
- Hands-on familiarity with knob-and-tube layouts common in San Francisco’s older housing stock
- Careful evaluation of splices, junctions, and any mixed wiring (K&T tied into Romex or conduit)
- Plain-language findings that are easy to share with a realtor, contractor, or insurance representative
- Safety-focused checks for overheating, improper fusing, and unprotected connections in hidden areas
- Respect for your home—clean work habits and minimal disruption while we access attic/basement/crawlspace areas
What You Get From a Knob-and-Tube Wiring Inspection
It’s more than “yes or no”—you’ll understand location, condition, risk level, and the smartest path forward.
Our Process: What the Inspection Looks Like
A simple, methodical visit that focuses on evidence, access points, and clear communication.
Site Walkthrough & Access Plan
We review the home’s layout and safely access attic, basement, and crawlspace areas without unnecessary disruption.
Identification & Condition Check
We confirm knob-and-tube presence, trace visible runs, and evaluate insulation, splices, and mounting integrity.
Risk Findings & Priorities
We flag issues that elevate risk—overfusing, heat damage, improper junctions, or insulation contact—and prioritize fixes.
Clear Summary & Next Steps
We explain the results in plain language and outline options, from targeted corrections to full replacement planning.
Inspection duration varies by access and home size, but most visits wrap up efficiently with a clear summary on the same day.
Helpful Information
Can Knob-and-Tube Wiring Cause a Fire? Real Risks in Older San Francisco Homes
Warning Signs Your Knob-and-Tube Wiring Is Unsafe (What Homeowners in San Francisco Should Watch For)
Knob-and-Tube Rewire Checklist for Homeowners: How to Prepare Your Home Before Electricians Arrive
What SF Electrical Inspectors Typically Check After a Rewire (And How to Avoid Red Flags)
Permits for Electrical Rewiring in San Francisco: Homeowner-Friendly Explanation (SFDBI Basics)
