January in Hamilton, Dundas, Ancaster, and the older Burlington neighbourhoods has a recognizable call pattern. The kitchen breaker trips every time the kettle and toaster run together. The space heater in the upstairs office takes the bedroom circuit out for the third time this week. A century home that has been fine for ninety years is suddenly fighting back. The reason is not bad luck and not "old houses" - it is a specific stack of issues that we see in this housing stock every winter. Here is the pattern and what each of the issues actually needs.
What a 1910 service was designed to carry
A typical pre-1950 Hamilton house was built with a 30A or 60A service. That was generous in its time - enough for lights, one or two small appliances, and not much else. The wiring is usually knob-and-tube, often with an early generation of rubber-and-cloth-insulated NMD as additions came along. Total electrical load on the original install was probably under 5 kW.
The house you are living in is not that house. Add: electric range, electric dryer, fridge, freezer, microwave, dishwasher, A/C, hot tub or pool, an EV charger, a couple of space heaters in the rooms the central heating cannot quite reach, a kettle, a toaster, a hair dryer, a vacuum. The connected load is now 30-50 kW. The service has been upgraded somewhere along the way - usually to 100A in the 1980s - but the branch wiring is still mostly the original layout. The kitchen and the bedrooms are on circuits that were never sized for what is plugged into them now.
The five-call pattern
Call one: the kitchen breaker keeps tripping
A century-home kitchen often has one 15A circuit serving every counter receptacle plus the fridge plus the under-cabinet lights. Running the kettle and the toaster together is 15-18 amps, and the breaker either trips or rides the limit while the fridge compressor kicks in. The right answer is two split 20A counter circuits per the current OESC, which means new home runs from the panel and new receptacles at the counter. Often a kitchen rework, not a quick fix.
Call two: the bedroom circuit dies when the space heater runs
Same pattern, different room. The upstairs is on the same 15A circuit it has been on since 1940, and that circuit also serves the hallway light, the bathroom outlet, and three other bedrooms. A 1500W space heater is 12.5 amps; add a phone charger, a bedside lamp, and another small heater somewhere on the circuit and the breaker trips. The right answer is a dedicated 20A circuit for the heater, or the real answer - the heater is treating a symptom of an HVAC problem the house has had for decades. We will say so.
Call three: the basement panel is warm to the touch
This one we hate finding. A panel that runs warm under heavy winter load is telling us a breaker is loose at its bus connection, a feeder lug is loose, or the panel itself is undersized for its current load. Loose connections heat under load. Heat damages the insulation around the connection. The damage gets worse over time and eventually arcs. We pop the cover (qualified work only - homeowners should not), thermal-image the bus and the lugs, torque every connection to spec, and replace any breaker that is showing heat damage. Sometimes the right outcome is a panel replacement - which, for a 1980s-vintage Federal Pioneer panel still serving a 2025 load, was overdue regardless.
Call four: lights flicker when the furnace blower kicks on
Two possibilities, both ugly. Possibility one is a 100A service that is genuinely undersized for the connected load - the voltage sags every time a big motor starts. The fix is a service upgrade to 200A, which on a Hamilton century home often involves the service-entrance cable, the meter base, the weatherhead, and coordination with Alectra. Possibility two is a bad service neutral, often where the original aluminum service-entrance cable connects to the panel. That one is more urgent - a failing neutral does real damage to electronics in the house. Either way it is a call before the next cold snap.
Call five: K&T in the attic, under blown-in insulation
This is the one that ages homeowners. Original K&T was designed to dissipate heat to surrounding air. When the attic gets blown-in insulation in 1995 to improve heating costs, the K&T is suddenly buried in cellulose with no airflow. Loads that were fine for ninety years now overheat the conductor. The rubber insulation embrittles faster, then crumbles. The OESC has had a specific prohibition on K&T being covered by insulation for many decades, which makes the configuration a code violation and a real fire risk. The fix is K&T remediation - covered in detail in our knob-and-tube wiring replacement post - and most Hamilton insurers will not write or renew coverage until it is done.
The space heater is a symptom, not a problem
Space heaters are the proximate cause of half our winter trips. They are also, almost always, a sign the house has an HVAC or insulation issue someone is trying to electrically duct-tape over. A back bedroom that is always cold in January means the heating run to that room is undersized, the duct has a leak, or the bedroom wall has insulation problems. A 1500W space heater fixes the symptom and creates an electrical problem.
If you are running space heaters every winter, the right conversation involves both an HVAC contractor and us. We can install a dedicated heater circuit so the breaker stops tripping. The more durable answer is heating that does not need supplementing in the first place - which is also where a heat pump retrofit conversation often starts.
The order we recommend the work
If you own a Hamilton century home and you can spread the work over a few years, the priority order that we recommend:
- Service inspection and panel assessment first. A walkthrough by a 309A tells you what is urgent and what is "fine for now." That conversation costs a flat diagnostic fee and saves more than that in misdirected work.
- K&T remediation if your insurer is asking, or if it is in the attic under insulation. This is the safety-first item and the insurance-driver. Sometimes paired with a service upgrade.
- Service upgrade to 200A if the load calc shows you need it. Often packaged with the K&T work so the new circuits land on a clean panel.
- Dedicated circuits for the rooms that are fighting the wiring. Kitchen counter splits, bathroom dedicated, bedroom heater circuits, laundry.
- The nice-to-haves last. EV charger, hot tub, sauna - these benefit from the upgrades above being done first.
What it usually costs
Century-home electrical work has the widest range we deal in. Two homes that look identical from the street can have 5x different scope inside the walls. A targeted K&T fix on a few attic circuits with an existing 200A panel is in one zone; a whole-house rewire with service upgrade, drywall repair, and three weeks on site is in another. We do not quote sight unseen on century homes. A diagnostic visit gives us enough to put a real proposal in writing, and the diagnostic fee is applied to the work if you go ahead.
When to call us
If your Hamilton, Dundas, Ancaster, or older Burlington home has been fighting you all winter, the diagnostic visit is the start of the conversation. We pair the assessment with a service upgrade proposal if the load calc says you need one, and any K&T or insurance documentation that comes out of it. Request a diagnostic visit and we will get a 309A out to walk the house with you.