How do I run hidden wiring for Toronto under-cabinet lights?

Running hidden wiring for under-cabinet lighting is a popular kitchen upgrade, but in Ontario it requires an ESA permit for any new circuit or hardwired connection — so the "how" depends heavily on whether you're going hardwired or plug-in.

Under-cabinet lighting generally falls into two categories: plug-in (low-voltage LED puck or strip lights) and hardwired (direct wire into your electrical system). Plug-in setups are DIY-friendly and require no permit — you simply route the low-voltage wire along the cabinet underside using adhesive clips or a wire channel, hide it behind the cabinet face frame, and plug into an existing outlet. Hardwired installations, however, involve connecting to your home's 120V wiring and legally require an ESA permit and inspection in Ontario, regardless of how simple the job seems.

For the wire concealment itself, the cleanest approach on Toronto's typical upper cabinets is to drill a small hole (⅜" is usually enough) through the bottom of each cabinet, running wire from unit to unit inside the cabinet box where it's completely hidden. If your cabinets have a decorative valance or face rail along the bottom front, that's your best friend — the wire can run horizontally behind it, completely invisible from normal viewing angles. In older Toronto homes (think Annex or Leslieville century houses), cabinets are often custom-built with solid frames that make interior routing easier, while post-war Scarborough or Etobicoke bungalows may have thinner stock cabinets where surface-mounted aluminum wire channels painted to match are a cleaner alternative.

Getting power to the lights is where most homeowners underestimate the complexity. The ideal source is an existing outlet inside an upper cabinet (common in kitchens built after the 1990s). If no outlet exists inside the cabinet run, a licensed electrician will typically fish a wire down from the attic or up through the wall cavity to a new junction point — this is where Toronto labour costs come in. Expect to pay $300–$500 for a simple plug-in conversion with an in-cabinet outlet added, $600–$1,200 for a hardwired installation on a single run of cabinets, and $1,500–$2,500+ if new dedicated wiring needs to be fished through finished walls with limited attic access.

Toronto Permit Reality

The ESA permit for this type of work is straightforward — typically $75–$150 — and your electrician should pull it automatically. Don't skip it. Unpermitted electrical work can void your home insurance and create serious problems at resale when a home inspector flags it. You can verify any electrician's licence at esa.on.ca.

When to DIY vs. Hire a Pro

If you're using plug-in LED strip lights or puck lights with a low-voltage transformer, the concealment work is fully DIY-able — wire channels, adhesive clips, and a drill are all you need. The moment you're connecting to 120V house wiring, call a licensed electrician. This is a half-day job for most pros and not worth the risk or legal exposure to DIY.

Your next steps: Decide on plug-in vs. hardwired, then browse licensed electricians in the Toronto Construction Network directory who specialize in kitchen electrical work. Get two or three quotes, confirm they'll pull the ESA permit, and ask specifically about their approach to wire concealment — a good electrician will walk you through exactly how they plan to hide the runs before they start.