Knob-and-tube
wiring in older
Chilliwack homes.

Knob-and-tube (K&T) wiring was the standard for residential electrical installation in North America from about 1880 through 1950. In Chilliwack, it shows up primarily in older Downtown Chilliwack homes, heritage properties in the Mountain View Heritage Conservation Area, and a handful of Rosedale and Yarrow farmhouses that date back to the early twentieth century.

If your home has it, this post covers what it is, why most insurance companies care, how much replacement costs in Chilliwack 2026, and when you actually need to do something about it.

What is knob-and-tube wiring

K&T is a two-wire system: one hot conductor and one neutral conductor, each run separately through walls and joists. The name comes from the porcelain knobs (insulators that supported the wires as they ran across framing) and the porcelain tubes (insulators where the wires passed through wood joists or studs).

The wire itself was typically copper with a rubber or cloth insulation. The rubber and cloth break down over decades, leaving bare copper conductors in some places. This is where the fire risk enters the picture.

Why insurance companies care

Three main reasons most Canadian residential insurance carriers will not issue or renew a policy on a home with active K&T:

1. Insulation aging. The original rubber and cloth insulation dries out and cracks over 70 to 120 years. Exposed copper in wall cavities is a fire risk.
2. No grounding.K&T is a two-wire system with no ground conductor. Modern three-prong outlets and most modern appliances expect a ground path.
3. Insulation contact.K&T was designed to run through open air in wall cavities. Modern insulation installed around K&T causes the wires to overheat because they cannot shed heat. Many older homes had insulation retrofitted over top of K&T by well-meaning homeowners, creating a serious fire risk.

The practical upshot: most Chilliwack insurance carriers require confirmation that a home has no active K&T before issuing or renewing a policy. Some will accept K&T with a premium surcharge and an electrical inspection report. Many will not insure it at all.

How to know if your home has K&T

Visual indicators in the basement or attic:

• Porcelain knobs. White or cream-colored porcelain insulators attached to joists or studs, about 2 to 3 cm in diameter, with wire running through them.
• Porcelain tubes. Small white porcelain tubes where wire passes through a wood joist or stud.
• Two-wire cable in walls. Separate hot and neutral wires with clear space between them, rather than modern Romex-style NMD90 cable where conductors are bundled in a single jacket.
• Two-prong outlets throughout the house.Especially on original walls that have not been renovated.

Many older Chilliwack homes have partial K&T. A renovation in 1970 might have rewired the kitchen and bathroom with modern cable while leaving K&T on bedroom circuits and in the attic. We do a full assessment at the site visit to map what is original versus renovated.

What does K&T replacement cost in Chilliwack?

Honest 2026 Chilliwack ranges for our Red Seal electrical division:

Assessment

$250 – $600

Whole-home inspection with a written report documenting where K&T is present, where it has been replaced, and what complete removal would cost. Acceptable to most insurance carriers as documentation.

Partial replacement

$5,000 – $15,000

Replacing K&T on specific circuits where it still exists, leaving modern wiring in place where it has already been updated. Typical on homes that had a kitchen or bathroom renovation decades ago but never had a full rewire.

Full whole-home rewire

$15,000 – $35,000

Complete removal of all K&T and replacement with modern NMD90 wiring. Usually includes a service upgrade (100A to 200A) and new electrical panel. Runs at the high end on larger heritage homes with significant wiring runs.

Do you need to remove all of it?

Not always. Some insurance carriers accept the following middle path:

• Verification that no K&T is live.A licensed electrician can disconnect K&T circuits and run modern wiring to the affected outlets and fixtures, leaving the old K&T in place but de-energized. Some insurance carriers accept this with documentation.
• Verification of no insulation contact.If K&T is in an attic with no insulation installed around it, the primary fire risk is reduced. Some insurers will accept this with an inspection report and a premium surcharge.

Our recommendation: talk to your specific insurance broker before committing to scope. Some insurers are strict about full removal, others accept middle-path solutions. We can coordinate with your broker on what documentation they specifically need.

When to do it

• Right before a major renovation.If walls are coming open anyway, rewiring is dramatically cheaper. Labour is the biggest cost of K&T replacement, and labour is lower when you do not have to patch drywall afterward.
• Before a home sale.Buyers' home inspectors flag K&T universally. It often becomes a sale condition or a price reduction point. Addressing it before listing simplifies the sale.
• Before insurance renewal if you have been notified.Some carriers give notice that K&T must be addressed at the next renewal. Taking action before the deadline avoids a coverage gap.
• After discovering insulation contact.If you find K&T surrounded by blown-in attic insulation or wall insulation retrofit, this is an active fire risk and warrants addressing promptly.

What a Huntley K&T replacement looks like

1. Assessment and quote. Our Red Seal electricians walk the home and document every circuit. Line-item quote by room or by circuit.
2. Permit. Electrical trade permit pulled directly through our BC LEC license. No waiting on a sub-trade.
3. Rewire. New NMD90 cable run through walls, new outlets and switches installed, new fixtures connected. Minimum drywall damage through use of fish tape and strategic access holes.
4. Panel upgrade. If the service is still on 60A or 100A, we upgrade to 200A at the same time. BC Hydro coordination handled.
5. Inspection and documentation.Final electrical inspection booked with the inspector. Written documentation for your insurance broker confirming no active K&T remains.
6. Drywall patching. Any drywall access holes patched, taped, and primed. Paint match typically done by homeowner afterward for room-wide repaint.

The bottom line

K&T wiring is not an immediate fire hazard in every case, but it is an insurance problem in most cases. If you own an older Chilliwack home and still have K&T, the question is not whether to address it but when.

The most efficient path is to tie K&T replacement to a major renovation you are planning anyway. Kitchen reno, bathroom rebuild, or whole-home work all involve drywall access that makes the rewire significantly cheaper than as a standalone project.