How long does a rewire take?

A partial rewire is usually days; a full rewire is usually one to three weeks

A rewire can be a one-room job or a whole-house project, so the timeline depends on scope first. Replacing a few unsafe circuits is not the same disruption as removing old wiring from every floor, adding new grounded circuits, updating devices, and coordinating ESA inspections.

For planning, these are realistic working ranges in Toronto and the GTA:

A typical full rewire of a 1,500–2,000 sq ft GTA home also has a meaningful budget impact: the published planning band is $8,000–$15,000, depending on access, finishes, and whether the panel is upgraded at the same time. For the cost side, see how much it costs to rewire a house in Ontario. For the work itself, the main service page is house wiring and rewiring.

These ranges assume a licensed electrical contractor is filing the ESA notification where required, roughing in new cable properly, correcting unsafe junctions, and leaving the system ready for inspection. They do not include major framing delays, structural surprises, asbestos abatement, or long waits for other trades.

Occupied homes take longer because the work has to be staged safely

An occupied rewire usually takes longer than a vacant rewire because the house still has to function at the end of each workday. The electrician may need to keep the fridge, furnace, internet equipment, sump pump, alarm, or a bedroom circuit live while old circuits are removed and new ones are pulled in.

In a vacant home, we can often shut down larger sections, open walls more aggressively, and run cables in the most efficient sequence. In an occupied home, the sequence changes. Work may move room by room, furniture has to be shifted, floors need protection, and holes are planned to reduce disruption rather than simply maximize speed.

Common occupied-home time factors include:

• Clearing closets, built-ins, basement storage, and attic access before cable fishing can start
• Working around plaster and lath, which is slower and messier than drywall
• Keeping temporary lighting or selected circuits available during the day
• Labelling which outlets and lights will be unavailable overnight
• Coordinating patching and painting after electrical rough-in
• Returning for final device installation after walls are repaired

A finished Toronto house with old plaster, narrow joist bays, and no open basement ceiling can take much longer than a newer home with a drop ceiling, accessible attic, and open renovation walls. The electrical work may be the same on paper, but the physical path for each cable is completely different.

There is also a practical dust and access issue. Rewiring often requires small access openings above switches, below outlets, at fire blocks, and near the panel. A careful contractor minimizes cuts, but a completely invisible full rewire in a finished house is rarely realistic. If a homeowner is already renovating, it is almost always faster to rewire before drywall, cabinets, tile, and trim go back in.

Drywall access, panel work, and circuit design decide the pace

Access is the biggest technical variable in rewire timing. If walls and ceilings are open, the electrician can drill studs, staple cable, install boxes, and run home runs to the panel in a normal rough-in sequence. If everything is finished, each cable may have to be fished through small openings, around blocking, and across joist cavities that were never designed for easy access.

A full rewire is not only “replace wire A with wire B.” The job usually involves redesigning circuits to match current use and the Ontario Electrical Safety Code. That can mean separate kitchen small-appliance circuits, bathroom GFCI protection, laundry and mechanical circuits, smoke/CO detector wiring, outdoor receptacle protection, and better distribution so one breaker is not carrying half a floor.

Panel work can also add time. If the existing panel has enough capacity and condition, new circuits may terminate there. If the panel is full, damaged, obsolete, poorly labelled, or undersized for the planned load, the rewire may need a panel replacement or service upgrade. That adds utility coordination, a longer shutdown, and another inspection step. If panel timing is part of your decision, read how long an electrical panel upgrade takes.

Panel-related delays often come from:

• Utility disconnect and reconnect scheduling with Toronto Hydro, Alectra, Hydro One, or the local utility
• Meter base or service entrance issues found during planning
• Existing unlabelled circuits that must be traced before removal
• Crowded panels with double-tapped breakers or improper splices
• New load calculation requirements for EV chargers, heat pumps, suites, or electric ranges

The cleaner the plan, the faster the work. A walk-through should confirm where beds, desks, TVs, kitchen appliances, bathroom fans, exterior outlets, and future EV or workshop loads will be. Moving an outlet on paper takes seconds. Moving it after cable is pulled and walls are patched can cost days.

ESA inspection scheduling can affect the finish date

ESA timing can add calendar days even when the electrical labour is on schedule. In Ontario, rewiring work generally requires an ESA notification when new wiring is installed or existing wiring is substantially altered. The inspection process is part of the timeline, not a formality after everything is hidden.

City Power Electrical Services is a Licensed Electrical Contractor, ECRA/ESA #7015314, and we file ESA notifications where required for Toronto and GTA rewiring work.

A typical rewire inspection sequence looks like this:

• Planning and notification: scope is confirmed, circuits are identified, and the ESA notification is filed where required.
• Rough-in: boxes, cables, staples, bonding, and panel terminations are installed before insulation and drywall close the work.
• Rough-in inspection: the inspector can see cable routing, box fill, support, protection plates, grounding and bonding, and breaker compatibility where relevant.
• Close-in and finishing: drywall repair, cabinets, fixtures, switches, receptacles, smoke/CO devices, and cover plates are completed.
• Final inspection: the inspector can verify devices, GFCI/AFCI protection where applicable, panel labelling, grounding/bonding continuity, and that the installation is safe to energize and use.

Inspection scheduling depends on ESA availability and the job location. Sometimes the rough-in inspection happens quickly; sometimes the next available slot adds a pause before drywall can close. Renovation sequencing should leave room for that. If the drywall crew boards before the required rough-in inspection, the project can be forced backwards.

This is why a “five-day rewire” can become a two-week calendar project. The electricians may only need five working days, but the calendar also includes utility appointments, inspection windows, patching, painting, and final device installation. If you are planning a longer renovation, it also helps to understand how long an ESA permit is valid.

The best timeline comes from sequencing the rewire before finishes

The fastest rewire is the one planned before finishes go in. If you are renovating, schedule the electrical rough-in after framing and before insulation, vapour barrier, drywall, cabinets, built-ins, and finished flooring. That lets the electrician install boxes at the right heights, drill clean routes, and get the rough-in inspected before anything is covered.

For occupied homes, the best schedule is usually a room-by-room plan with priorities. Essential loads come first, then bedrooms and living areas, then finish devices once patching is done. If knob-and-tube, damaged cloth cable, or unsafe splices are being removed, the plan should also identify what can remain temporarily energized and what must be disconnected immediately.

Before the first day, homeowners can shorten the timeline by doing simple preparation:

• Clear one metre around the electrical panel
• Empty closets and storage areas where wires may pass
• Move furniture away from outlet and switch walls
• Decide final locations for TVs, desks, appliances, and beds
• Confirm whether drywall repair and painting are by your contractor or a separate trade
• Ask which circuits will be off each day and what will be restored overnight

A rewire is disruptive, but it should not be chaotic. The written estimate should separate electrical scope, ESA notification, panel work, access assumptions, and what happens after inspection. If you are comparing options because the issue is aluminum wiring rather than old cloth or knob-and-tube wiring, see how long aluminum wiring remediation takes; it is often a different project than a full rewire.