Is knob and tube wiring actually dangerous?

It can be, especially when it is still active and buried inside an older home. The insulation often becomes brittle with age, the system has no equipment ground, and it was never designed for the electrical loads common in modern kitchens, laundry rooms, heating equipment, or home offices. Risk climbs further when later renovations added improper splices or insulation covered the original runs.

How do I know if my Mimico home has knob and tube wiring?

If your Mimico home dates from the early twentieth century through the mid-century period, some original wiring may still remain in service. Usual signs include porcelain knobs mounted to framing, ceramic tubes where wires pass through joists or studs, cloth-wrapped two-wire conductors, and older ungrounded outlets. A licensed electrician can confirm what is active and what has already been abandoned.

How much does knob and tube rewiring cost in Mimico?

Cost depends on the home size, how accessible the attic and wall cavities are, whether finished spaces need careful fishing, and whether a panel upgrade is part of the project. A small bungalow is usually less complex than a larger detached home or a property with several additions and renovation-era tie-ins. We provide a written quote after the on-site assessment.

Does replacing knob and tube wiring require a permit in Mimico?

Yes. In Ontario, this kind of electrical replacement work must be completed under an ESA permit and pass inspection before it is considered finished. That documentation matters for safety, resale, and insurance records.

Will my insurance company accept the work?

Usually yes, provided the rewiring is done under permit and receives ESA approval. After inspection, you receive a Certificate of Inspection that can be shared with the insurer to show the active knob and tube has been properly replaced.

Can I stay in my home during the rewire?

In many cases, yes. We stage the job so the house remains as functional as possible while circuits are being changed over. There are still short planned outages during certain parts of the project, especially when panel work is underway, and we explain that schedule in advance.

How long does the rewire take?

Most single-family rewiring projects take about 3 to 7 working days, depending on the layout, access, and total scope. Smaller homes finish more quickly than larger Mimico properties with finished basements, limited attic access, or added service work.

Does my attic insulation need to be removed first?

If active knob and tube is buried under insulation, the electrical issue should be addressed before more insulation work is done. We remove and replace the old wiring first so the attic can be upgraded properly once the rewiring and inspection are complete.

Mimico homeowners are often being asked by insurers to deal with active knob & tube wiring before coverage becomes an issue. Book a free assessment today

Knob & Tube Wiring Specialists

Knob & Tube Wiring Replacement Mimico

Mimico blends older detached homes and post-war bungalows with newer lakeside condo development along Lake Shore Boulevard West and Humber Bay Shores. Many of the earlier houses in the neighbourhood still hide original knob and tube inside attics, basement ceilings, and wall cavities. Our ESA-licensed electricians replace that outdated wiring with a modern code-compliant system so your Mimico home is safer, more insurable, and ready for present-day electrical demand.

Call +1 866 565 5427 Free Quote

ESA Licensed 7015453

5M Insured

4.9 Google Rated

Knob and tube wiring before replacement Toronto home

Actual job photos

Degraded knob and tube insulation fire hazard

Why Knob & Tube Wiring Must Be Replaced

In Mimico and Humber Bay Shores, many older properties still carry parts of their original electrical system long after the rest of the home has been renovated. That wiring was built for a different era and does not match the way households use power today.

No Ground Wire

Knob and tube only uses hot and neutral conductors, which means your receptacles and appliances miss the grounding protection expected in a current residential electrical system.

Deteriorating Insulation

The old rubber and cloth sheathing often dries, splits, and crumbles after decades in service, leaving energized conductors more exposed inside wood framing and hidden cavities.

Overloaded Circuits

These circuits were never planned for modern kitchens, portable AC units, home office equipment, EV chargers, or the number of devices found in a typical household now.

Insurance Cancellation

Insurers frequently flag active knob and tube during renewals, purchases, and refinancing, and homeowners are often told to correct it before coverage terms become more restrictive.

Buried by Insulation

This system depends on open air around the conductors to shed heat, so once attic insulation surrounds active runs, the conditions become much less safe than originally intended.

Reduced Home Value

Home inspectors and buyers tend to treat active knob and tube as a significant defect, which can weaken negotiations, delay transactions, and make financing conversations harder.

Is Your Insurer Threatening Cancellation?

We can inspect the wiring, outline the required scope in writing, and move quickly on Mimico rewiring work so you have a clear path toward resolving the issue.

Call for Urgent Help

Before & After Real Rewiring Jobs

These job photos show the type of knob and tube replacement work we carry out in older south Etobicoke homes, including the kinds of properties found throughout Mimico.

Before

After

A newly organized panel with clearly identified circuits after the old wiring has been replaced and the system has been brought up to modern standards.

What We Find in Mimico Homes

In Mimico and New Toronto, we regularly uncover porcelain knobs, ceramic sleeves, cloth-covered conductors, and later-era splices that were added long after the original installation.

Knob and tube wiring in Toronto home framing

Junction splice in Toronto home wall cavity

Knob and tube runs in Toronto basement ceiling

Knob and tube in floor joists heat buildup risk

Cloth-wrapped knob and tube conductor with cracking

Knob and tube mixed with newer wiring code violation

Finance Your Rewiring Project

Use this estimator to preview possible payment options for a Mimico knob and tube replacement project before you book your on-site assessment.

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Term60 months

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Administration fee149.00

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Subject to credit approval. Actual interest rate, purchase amount, credit limit, payments and terms are subject to change and may vary upon approval. Payment and interest rate apply to term only. For illustrative purposes only. Not a final offer.

Our Knob & Tube Rewiring Services

From full-house rewires in Mimico to selective upgrades near Royal York South and Humber Bay Shores, we handle the complete process of replacing unsafe legacy wiring with a clean, insurable installation.

Full Home Rewire

We replace active knob and tube throughout the property and install new modern wiring, devices, and circuits designed for current household use.

Partial Rewire & Targeted Circuits

If only part of the house still has legacy wiring, we can isolate the remaining active sections and update only the circuits that still require replacement.

Panel Upgrade

Many older homes need a panel or service upgrade at the same time so the new wiring can support present-day loads safely and neatly.

ESA Permit & Inspection

We handle the permit process and coordinate the inspection so the completed project has the documentation insurers and buyers usually ask for.

Insurance Assessment Letter

If your insurer needs clarity quickly, we can inspect the system and provide a written assessment showing what remains active and what needs to be changed.

GFCI & AFCI Upgrades

We include the protection required for modern kitchens, bathrooms, bedrooms, exterior receptacles, and other areas governed by current code rules.

Attic Insulation Clearance

Where insulation is covering active knob and tube, we address the electrical work first so the attic can be upgraded properly afterward.

Pre-Sale Rewire

We help sellers remove an electrical red flag before listing or closing so negotiations are less likely to stall over outdated wiring.

Want to Know What It Costs?

See our detailed guide to knob and tube rewiring costs, including how price changes with house size, access, and panel-upgrade requirements.

View Full Cost Guide

How We Replace Knob & Tube Wiring

Our process is built to keep a Mimico project organized, minimize disruption to finishes, and make sure you always know what stage the work is in.

Free Assessment

We inspect your Mimico property carefully, checking the panel, attic, basement runs, and concealed areas to determine where active knob and tube is still in service.

Written Quote

You receive a clear written proposal that outlines labour, materials, permit-related scope, and any recommended upgrades before the work starts.

ESA Permit

We open the required ESA permit and schedule the job under the proper Ontario process so the project is documented correctly from the outset.

Careful Rewire

Our electricians route new cable strategically, remove obsolete conductors, and fish wiring as cleanly as possible to reduce unnecessary wall and ceiling openings.

ESA Inspection

After installation is complete, the job is inspected so you receive the official approval showing the work passed and the electrical replacement is properly documented.

Final Walkthrough

We test the circuits, label the panel clearly, confirm devices are functioning, and review the finished work with you before the project closes out.

Why Mimico Homeowners Choose Kolji Bros

Older properties around Mimico-by-the-Lake, Royal York South, and Humber Bay Shores need careful planning because legacy wiring is often mixed with partial renovations from later decades.

ESA Licensed & Insured

We complete rewiring under ESA/ECRA licence 7015453, carry full insurance, and provide the inspection paperwork that matters for both records and insurance compliance.

Mimico Old-Home Experience

We understand the wiring patterns found in older south Etobicoke houses, including attic runs, basement ceiling routes, and patchwork additions from previous renovations.

Minimal Drywall Disruption

We plan wire routes with care and fish where practical so the electrical upgrade stays efficient without creating more patching than necessary.

Transparent Pricing

Your quote is laid out clearly before the work begins, and if hidden conditions are uncovered, we explain them before any additional scope moves forward.

Fast Turnaround

Most homes are completed in a practical 3-to-7-day window, with the schedule organized to keep the property as functional as possible throughout the job.

4.9 Google Rating

Homeowners regularly mention clear communication, tidy workmanship, and dependable follow-through, which is reflected in the company’s 4.9 Google rating.

Mimico Neighbourhoods We Serve

We handle knob and tube rewiring across Mimico and the surrounding south Etobicoke pockets where older detached homes, renovated bungalows, and legacy wiring systems are still common.

Mimico-by-the-Lake

Humber Bay Shores

Royal York South

Lake Shore Village

Palace Pier Area

Mystic Pointe

Park Lawn Strip

Grand Avenue Area

Superior Avenue Area

Mimico GO Area

Manitoba Street Area

Legion Road Area

Not Sure If You Have Knob & Tube?

Call us or send a message through the contact form and we’ll arrange an inspection to confirm what is active, what is abandoned, and what should be replaced first.

Call +1 866 565 5427

What Mimico Homeowners Say

These review examples reflect the kinds of rewiring jobs we regularly handle in Mimico and the surrounding south Etobicoke area.

“We bought a detached home near Mimico-by-the-Lake and the inspection revealed active knob and tube in the attic and second floor lighting. Kolji Bros moved quickly, rewired the old sections, and gave us the ESA paperwork our insurer wanted.”

Amira L.Homeowner, Mimico-by-the-Lake

“Our Humber Bay Shores renovation uncovered several old branch circuits that had been left tied into newer work. The team cleaned up the unsafe splices, replaced the remaining knob and tube, and upgraded the panel layout so everything made sense.”

Marco R.Homeowner, Humber Bay Shores

“We had a firm insurance deadline on our Royal York South bungalow and needed the basement and main-floor circuits redone fast. Kolji Bros kept the job organized, explained every step, and finished in time for us to send the certificate to the insurer.”

Julia T.Homeowner, Royal York South

Read All Google Reviews

Knob & Tube Wiring FAQ Mimico

These are the questions we hear most from Mimico homeowners dealing with older wiring, insurance pressure, and renovation-related electrical surprises.

Yes, it can be. The risk usually comes from age, brittle insulation, lack of grounding, hidden modifications, and a system that was never intended to support how homes use electricity now. Once that older wiring is mixed with later additions or buried under insulation, the concerns become even more serious.

Homes built in the early part of the last century through the mid-century period may still contain active knob and tube. Common clues include porcelain knobs on framing, ceramic tubes through joists, cloth-covered two-wire runs, and ungrounded outlets or older light circuits that have never been fully modernized.

Cost changes with the house size, the amount of old wiring still active, the difficulty of accessing attics and finished walls, and whether a panel upgrade is included at the same time. To see a broader pricing breakdown, visit our knob and tube rewiring cost guide.

Yes. This type of rewiring in Ontario must be completed under an ESA permit and inspected afterward. That paperwork confirms the installation was completed properly and gives you official proof that the electrical work passed.

In most cases, yes. Once the work is completed under permit and the ESA inspection is passed, you receive a Certificate of Inspection that can be provided to the insurer to show the active knob and tube issue has been corrected.

Usually yes. We stage the work so the home stays as usable as possible throughout the project, although some circuits will need planned shutdowns while they are being replaced or while the panel is being changed over.

Most single-family rewiring projects are finished in roughly 3 to 7 working days. Smaller homes can move faster, while larger properties with more finished spaces or additional service work naturally take more time.

If insulation is covering active knob and tube, the electrical problem should be dealt with first. We replace the old wiring before the attic is upgraded so the finished result is both safer and easier to document properly.

Knob & Tube Replacement in Nearby Areas

We also serve the neighbouring communities connected to Mimico through our west-end service area.

Kingsway 12 min drive New Toronto 7 min drive Stonegate-Queensway 6 min drive Etobicoke 8 min drive Swansea 11 min drive

Make Your Mimico Home Safer and Fully Insurable

If an insurer, buyer, or home inspector has raised concerns about old wiring, we can assess the system, explain the scope clearly, and complete a code-compliant rewire for your Mimico property.

Call +1 866 565 5427 Get a Free Quote Online

ESA Licensed 7015453

4.9 Google Rating

5M Insured

ESA Permit Included