# Knob and Tube Replacement Toronto | ESA Permit Included | Toronto Electrical Contractor > Need knob and tube replacement in Toronto? Full rewires from $8,000, plaster-friendly work, ESA Certificate for your insurer. Call (416) 900-2963. URL: https://torontoelectricalcontractor.ca/knob-and-tube-wiring-replacement/ ![](/images/misc/heritage-toronto-home-attic-with-ceramic-knob-and-.webp) Knob & Tube Replacement # Knob and Tube Wiring Replacement in Toronto Heritage Homes Toronto Electrical Contractor [/ →](/) provides knob and tube wiring replacement for Toronto and the GTA - full home rewires, partial attic and basement rewires, active and idle knob-and-tube removal, two-wire ungrounded circuit replacement, and plaster-friendly heritage home remediation for residential and commercial properties. Every project delivers an ESA Certificate of Acceptance for your insurer with no ceiling demolition required. Toronto Electrical Contractor serves Toronto, North York, Etobicoke, Scarborough, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, and the broader GTA. Typical Cost $8,000–$15,000 full home rewire (size and wall finish drive cost) Get a Free Estimate [/contact/ →](/contact/) Call (416) 900-2963 [tel:+14169002963 →](tel:+14169002963) ESA Licensed Contractor Permits In House & Included Flat Rate Quoted Before Work 24/7 Emergency Response Toronto Electrical Contractor is an ESA-licensed electrical contractor based in Toronto that removes and replaces knob-and-tube wiring in pre-1950 homes across the GTA. With 15+ years in the trade and 1,500+ completed projects, our electricians pull every ESA permit in-house and hand you the Certificate of Acceptance your insurer asks for. If your insurer just sent a non-renewal letter, we know how stressful that news feels. Century homes and other older homes are beautiful, but many still hide outdated electrical systems behind their plaster walls. Here is what a complete Knob and Tube Wiring Replacement really takes, from the first circuit test to the final ESA sign-off. ## Why Insurers and the ESA Flag Knob-and-Tube Wiring We often see the original porcelain knobs and cotton-wrapped copper wire during home inspections. This system was the dominant residential wiring method in Toronto [/service-areas/toronto/ →](/service-areas/toronto/) and across Ontario from roughly 1880 to the 1940s. Those rubber and cloth materials naturally degrade over 50 to 80 years, creating three compounding problems over time. - Crumbling insulation exposes bare copper inside your walls. - Heat buildup is severe because modern blown cellulose or fibreglass batt insulation buries wires designed to cool in the open air. - No ground wire exists, which means plugging in a modern window AC or a space heater easily overloads the 1920s-rated circuits. ![Toronto Electrical Contractor electrician inspecting live knob-and-tube wiring on porcelain knobs in a Toronto basement](/images/misc/close-up-of-original-knob-and-tube-wiring-with-por.webp) Toronto Electrical Contractor’s electricians treat these hazards as the first priority on every job. These risks led the Electrical Safety Authority to remove all installation rules for this method from the Ontario Electrical Safety Code, so no new knob-and-tube can be installed in Ontario today. Major insurers like TD and Intact refuse new policies on active systems or double the premiums. A full removal backed by an ESA Certificate of Acceptance is the documented route back to standard insurance rates. ## Is Your Old Wiring Still Live? Active vs Abandoned Runs Our first step on every project is determining exactly what still carries electricity. Many Victorian semis, row houses, and bay-and-gable homes in Leslieville, Parkdale, and Roncesvalles had partial rewires between the 1970s and 1990s, where earlier contractors updated the kitchen and bath but skipped the attic and second-floor bedrooms. That leftover wire often still powers your upstairs lighting and several receptacles. We open accessible junction boxes to trace circuits back to the panel, turning this exploratory endeavor into a clear map of your home. | Status | Definition | Insurance Impact | Action Required | | --- | --- | --- | --- | | Active | Carries live current | Coverage denied or high premiums | Mandatory removal | | Abandoned | Disconnected from panel | Accepted by most providers | Leave in wall or remove | Providing a written assessment showing only abandoned runs is usually enough for most insurance companies. We will quote the extra labour to pull those dead conductors out of your basement and attic if your specific carrier demands complete physical removal from inside the walls. Some providers, like Square One Insurance, can give buyers a short 30 to 60-day grace period to complete this work after closing. ## Rewiring Plaster-and-Lath Walls in Toronto’s Century Homes We find the most active legacy systems in pre-1950 properties across Toronto [/service-areas/toronto/ →](/service-areas/toronto/) , specifically in the Victorian and Edwardian homes of The Annex [/service-areas/the-annex/ →](/service-areas/the-annex/) , High Park [/service-areas/high-park/ →](/service-areas/high-park/) , Cabbagetown, Rosedale, Riverdale, Forest Hill, and Bloor West Village. Century homes feature beautiful plaster-and-lath walls, original crown mouldings, and sometimes a Heritage Toronto designation that legally restricts what you can modify. Following the City of Toronto Heritage Permit Guide requires careful planning and a delicate touch. ![Small access cut in the plaster-and-lath wall of an Annex century home, used to fish new NMD90 cable](/images/misc/close-up-of-clean-access-cut-in-plaster-lath-wall-.webp) Our standard rewire approach in heritage homes includes: - Fishing new NMD90 (Loomex) cable through wall cavities behind existing baseboards. - Using closet walls and access panels in mechanical rooms as primary fish points. - Cutting small access holes sized perfectly to fit modern replacement boxes. - Patching with traditional lime plaster rather than standard drywall to maintain historic integrity. - Working strictly with hand tools within one metre of designated original mouldings. - Saving and carefully reinstalling original door trim and baseboards wherever possible. We handle these specific challenges daily, ensuring your home retains its historic charm. This plaster-friendly approach carries a labour premium of roughly 40 to 60 percent compared to a standard drywall project. In 2026, a full-home rewire runs $8,000 to $15,000 on a flat-rate written quote. Straightforward layouts sit at the lower end, while multi-storey heritage restorations requiring extensive plaster preservation sit closer to the top. ## What Does an ESA Certificate of Acceptance Prove to Your Insurer? Every Toronto Electrical Contractor rewire ends with an official Certificate of Acceptance issued by the Electrical Safety Authority. This is the document that closes the file with your insurance provider or mortgage lender. Filing a notification of work under Rule 2-004 is mandatory in Ontario, and the final inspection proves several vital points. The certificate documents that: - All previously identified active wire has been replaced or properly abandoned. - New wiring fully meets the current Ontario Electrical Safety Code. - The work was performed by an ECRA/ESA Licensed Electrical Contractor under a valid permit. - An independent ESA inspector visually verified the installation. We hand you this certificate along with a sample insurer letter to attach straight to your renewal package. Most companies reinstate your standard coverage and drop those heavy premium loadings within two to four weeks of receiving the proof. ## Knob and Tube Replacement Plus a Panel Upgrade: One Permit, One Project We upgrade the panel on about half of our rewiring projects because one combined job costs less than two separate ones. An old 60A fuse box or 100A panel usually cannot support the modern AFCI and GFCI breakers required for your new, grounded circuits, and we coordinate the Toronto Hydro disconnect and reconnect when the service size changes. The ESA inspector will block the final sign-off until a recalled Federal Pacific or Zinsco board gets replaced anyway. | Project Approach | Cost Efficiency | ESA Permit Required | Project Timeline | | --- | --- | --- | --- | | Separate Projects | Higher total cost | Two separate permits | Extended disruption | | Bundled Upgrade | Saves on combined labour | Single combined permit | Completed at the same time | Our clients appreciate that doing a panel upgrade [/electrical-panel-upgrade/ →](/electrical-panel-upgrade/) at the same time means paying for one permit and receiving one Certificate covering the entire system. Post-war additions often layered 1960s aluminum over the original 1910s copper runs. For older estates in The Annex [/service-areas/the-annex/ →](/service-areas/the-annex/) or High Park [/service-areas/high-park/ →](/service-areas/high-park/) , we also frequently bundle aluminum wiring remediation [/aluminum-wiring-remediation/ →](/aluminum-wiring-remediation/) to handle everything at once. One combined permit and one Certificate of Acceptance covers the whole electrical system. ## How Our Rewires Compare | Feature | Typical Provider | Toronto Electrical Contractor | | --- | --- | --- | | ESA permit | Sometimes left to the homeowner | Filed in-house on every job | | Pricing | Hourly estimate, final bill varies | Flat-rate written quote, $8,000-$15,000 for a typical full home | | Plaster walls | Open walls, patch with drywall | Minimal-cut fishing, patched with traditional plaster | | Insurer paperwork | Invoice only | ESA Certificate of Acceptance plus a sample insurer letter | | Living in the home | Move out or whole-house outages | Room-by-room sequencing, power restored each evening | Planning your Knob and Tube Wiring Replacement does not have to be overwhelming. Whether your home is a Victorian semi in the west end or a 1940s bungalow in Etobicoke or North York, we walk you through every step, protecting your heritage features while bringing your wiring up to the current Ontario Electrical Safety Code. Looking for a licensed electrician near you for knob and tube work? Before you hire anyone, confirm their ECRA/ESA licence through the ESA’s online contractor lookup and read their Google or HomeStars reviews. > Ready to secure your home and drop those high insurance rates? Call (416) 900-2963 or request a free estimate for a written assessment and a flat-rate quote. Recent Work ## Knob and Tube Wiring Replacement Gallery ![Knob and Tube Wiring Replacement project example](/images/misc/active-knob-and-tube-wiring-with-ceramic-knobs-clo.webp) ![Knob and Tube Wiring Replacement project example](/images/misc/plaster-wall-being-fished-with-modern-nmd90-wire-b.webp) ![Knob and Tube Wiring Replacement project example](/images/misc/removed-ceramic-knob-and-tube-components-ceramic-t.webp) ![Knob and Tube Wiring Replacement project example](/images/misc/esa-certificate-of-acceptance-document-after-full-.webp) Our Process ## How We Do This Job 01 ### Active vs Abandoned Assessment We open accessible junction boxes, test live circuits at the panel, and identify which K&T is still energized vs already isolated. You get a written scope and a flat quote. 02 ### Sequencing Plan We sequence the work room-by-room so you keep most of the home livable. Bedrooms get done together, then living areas, then kitchen. Typical 5–10 days end-to-end. 03 ### Plaster-Friendly Rewire We fish modern NMD90 cable through the existing wall cavities with minimal cuts, preserve original mouldings, and patch with plaster (not drywall) where the original walls are plaster. 04 ### ESA Certificate Final ESA inspection signs off the entire job. You receive the Certificate of Acceptance and a sample letter for your insurer. ![](/images/misc/toronto-electrician-night-work-headlamp-truck-ligh.webp) Same Day Response ## Get a Free Knob and Tube Wiring Replacement Quote Flat-rate pricing with ESA permits and inspection included. Same-day quotes for urgent work. Get a Free Estimate [/contact/ →](/contact/) (416) 900-2963 [tel:+14169002963 →](tel:+14169002963) Customer Reviews ## What Toronto Homeowners Say About Our Knob & Tube Replacement Service Real reviews from clients across Toronto, North York, Scarborough, Etobicoke, and the broader GTA. Average **4.9/5** across 100+ jobs. > "Insurance company gave us 30 days to deal with knob-and-tube before they'd renew. The team rewired our 1912 Annex semi in eight days, room by room, and worked carefully around the original plaster. ESA Certificate of Acceptance closed the file. Renewal went through with no premium hike." Megan R. Howland Avenue, The Annex > "Heritage Toronto designation on our 1908 Madison Avenue home meant plaster preservation was non-negotiable. They used minimal-cut lath fishing and hand tools near every original moulding. Where they had to open the walls, the patching was clean and barely visible after the trim paint." Thomas H. Madison Avenue, The Annex > "Roncesvalles 1920s home with active K&T everywhere and a 1970s aluminum addition layered on top. Full safety inspection first, then a prioritized scope: insurance-critical items first. We stayed in the home throughout the seven-day rewire and power was restored each evening." Magdalena B. Roncesvalles, High Park FAQ ## Knob and Tube Wiring Replacement: Frequently Asked Questions ### Will my Ontario insurer drop me for knob-and-tube wiring? + Most Ontario insurers refuse to renew on active knob-and-tube. We provide an ESA Certificate of Acceptance after a full rewire. That's the document insurers accept as proof of remediation. About 80% of our K&T work is driven by an insurance non-renewal letter. ### Does abandoned knob-and-tube wiring have to be removed for insurance? + Usually not. Active K&T (still energized) is the insurer's concern and the safety risk. Abandoned K&T (disconnected at the panel, often left in walls during prior partial rewires) is accepted by most Ontario insurers if it is documented. We test every wire run and record active vs abandoned in the written quote, and we quote physical removal separately for carriers that demand it. ### Is knob and tube wiring legal in Ontario? + Existing knob-and-tube is not illegal to live with in Ontario, but the Ontario Electrical Safety Code no longer permits new knob-and-tube installations, and any extension or repair has to be done in modern grounded cable. The practical pressure comes from insurers, most of whom refuse to renew or heavily surcharge homes with active K&T until an ESA Certificate of Acceptance shows it has been replaced. ### Can I replace knob and tube wiring myself in Ontario? + Ontario homeowners can legally do electrical work on a single-family home they own and live in, but only after filing an ESA notification and passing ESA inspection. A full rewire involves a panel cutover, fishing cable through plaster and lath, and AFCI and GFCI protection, and most insurers expect it to be done by an ECRA/ESA Licensed Electrical Contractor. Paying an unlicensed person to do the work for you is illegal in Ontario. ### How much does it cost to rewire a Toronto home? + $8,000–$15,000 (2026 pricing) for a typical pre-1950 \[Toronto\](/service-areas/toronto/) home of 1,500–2,500 sq ft. The variation comes from wall finish (plaster is more labour than drywall), home size, basement access, and whether a panel upgrade is included. Larger heritage homes in The Annex or Forest Hill can run $18,000–$25,000. Estimates are free. ### Can I stay in the home during the rewire? + Yes. We sequence the work so most of the home stays livable throughout. Power to specific rooms goes off for short windows (usually under 4 hours per room). Refrigeration, internet, and at least one bathroom stay live. Full-home outages happen only briefly at the panel cutover. ### How long does a full-home K&T rewire take? + 5–10 calendar days for a typical Toronto semi or detached home. Heritage homes with extensive plaster, original mouldings, or unfinished basement access can extend to 12–14 days. We give you a daily schedule before we start. ### Will the rewire damage my plaster walls? + We do plaster-friendly rewires using minimal-cut fishing techniques. Small access points behind baseboards, in closets, and at outlet locations. Where cuts are necessary, we patch with traditional plaster (not drywall) on heritage homes. Heritage Toronto-designated properties get hand-tool-only work near original mouldings. Related Guides ## Knob and Tube Wiring Replacement Guides & Resources Background Reading ### Heritage Homes, Plaster Walls, and Knob-and-Tube Removal Plaster wall preservation, fishing wire through historic structures, minimal-cut techniques, lath considerations, and heritage trim protection. [Heritage Homes, Plaster Walls, and Knob-and-Tube Removal →](/guide/heritage-home-knob-and-tube-removal-toronto/) Background Reading ### How to Identify Knob and Tube in Your Toronto Home Where to look (basement joists, attic), what porcelain knobs/tubes look like, age-of-home as proxy, and our free in-home assessment offer. [How to Identify Knob and Tube in Your Toronto Home →](/guide/how-to-identify-knob-and-tube-wiring/) Background Reading ### Living Through a Whole-Home Rewiring: What to Expect Timeline (typical 5–10 days), room-by-room sequence, drywall and plaster patching scope, occupied vs vacant work, and dust/cleanup expectations. [Living Through a Whole-Home Rewiring: What to Expect →](/guide/what-to-expect-knob-and-tube-replacement/) Background Reading ### What Is Knob and Tube Wiring? Porcelain knobs and tubes explained, era of installation, ungrounded circuits, cloth-covered insulation, and why it was replaced. [What Is Knob and Tube Wiring? →](/guide/what-is-knob-and-tube-wiring/) Background Reading ### Why Ontario Insurance Companies Reject Knob and Tube Insurer fire-risk reasoning, common Ontario carrier policies, the 'uninsurable' pain point, and ESA Certificate of Acceptance as proof of remediation. [Why Ontario Insurance Companies Reject Knob and Tube →](/guide/insurance-knob-and-tube-ontario/) Decision Guide ### Active vs Abandoned Knob and Tube: When Partial Replacement Works Active circuits vs disconnected K&T, insurer acceptance of partial remediation, ESA inspection report wording, and a clear decision tree. [Active vs Abandoned Knob and Tube: When Partial Replacement Works →](/guide/active-vs-abandoned-knob-and-tube/) Decision Guide ### Knob and Tube Replacement Cost in Ontario (2026) Cost ranges across Ontario, square-footage drivers, plaster vs drywall impact, partial vs full pricing, and financing options. [Knob and Tube Replacement Cost in Ontario (2026) →](/guide/knob-and-tube-replacement-cost-ontario/) Decision Guide ### Knob and Tube vs Aluminum Wiring: Which Is the Bigger Insurance Risk? Side-by-side hazard profile, insurer treatment differences, remediation cost differences, and what to do if a Toronto home has both. [Knob and Tube vs Aluminum Wiring: Which Is the Bigger Insurance Risk? →](/guide/knob-and-tube-vs-aluminum-wiring/) Related Services ## More Toronto Electrical Services ### Aluminum Wiring Remediation Aluminum wiring remediation in Toronto from $75 per device. ESA-approved AlumiConn pigtailing, CO/ALR devices, and full copper replacement, with an Electrical Safety Authority Certificate of Acceptance for your insurer. [Aluminum Wiring Remediation →](/aluminum-wiring-remediation/) ### Electrical Panel Upgrade Toronto Electrical Contractor performs 100-amp to 200-amp service upgrades, Federal Pacific Stab-Lok panel replacements, Zinsco panel replacements, and sub-panel additions across Toronto - flat-rate pricing, Toronto Hydro coordination, and ESA Certificate of Acceptance included. [Electrical Panel Upgrade →](/electrical-panel-upgrade/) ### Electrical Safety Inspection Toronto Electrical Contractor performs ESA-recognized electrical safety inspections on residential and commercial properties across Toronto and the GTA for home purchases, pre-listing, landlord licensing, and insurance renewals. Thermal scan, written deficiency report, and sample insurer letter within 48 hours, $250-$450. [Electrical Safety Inspection →](/electrical-safety-inspection/) ![](/images/misc/toronto-electrician-night-work-headlamp-truck-ligh.webp) Same Day Response ## Ready for Knob and Tube Wiring Replacement? Free estimates on residential projects. Flat-rate quotes with ESA permits and inspection already included. Get a Free Estimate [/contact/ →](/contact/) (416) 900-2963 [tel:+14169002963 →](tel:+14169002963)