Lighting a Renovation Properly: Layers, Placement and Switching

A renovation lighting plan decides more about how a finished room feels than the paint colour does, and it is the part homeowners most often leave until the electrician is already standing in the room. Lighting has to be settled while the ceilings and walls are open: every box, every wire run and every switch position is fixed before drywall goes up. Moving a pot light after the ceiling is taped and painted means cutting, patching and repainting.

This guide covers the three layers of light a room needs, where fixtures actually go, how to choose colour and brightness, and how to plan the switches so the room is easy to live with. It is written for homes in Toronto and the GTA, where the work is governed by the Ontario Electrical Safety Code.

What are the layers of lighting, and why does one ceiling fixture fall short?

Good rooms are lit in three layers: ambient light that fills the room, task light aimed at the surface where you work, and accent light that picks out a wall, a shelf or a ceiling detail. A single fixture in the middle of the ceiling only does the first job, and it puts your own shadow on anything you try to do at the edges of the room.

The layers only work if each one can be switched or dimmed on its own. Pot lights, pendants and a cove strip all wired to one switch give you one setting: everything on. It is one of the most common lighting mistakes in rooms renovated without a plan.

Where should pot lights go in a renovated room?

Pot lights belong where light is needed, not on a neat grid in the middle of the ceiling. Place the first row so its light lands on the counters, the wall art or the front of the cabinets, then fill the middle of the room. Spacing depends on ceiling height, the fixture's beam and the joists you have to work around.

A starting rule for spacing

A rule of thumb many lighting designers use is to space recessed lights roughly half the ceiling height apart. On a standard 8-foot ceiling that puts them about 4 feet apart, and the first row 2 to 3 feet out from the walls. It is a starting point for the drawing, not a law: a fixture with a wide beam can sit further apart, and a narrow spot needs to be closer.

What the joists and ducts decide

Once the ceiling is open, the real layout has to fit between joists, ductwork, plumbing and the beam that holds up the floor above. Thin LED wafer lights need very little depth and no large housing, which makes them practical in older Toronto houses with shallow or crowded joist bays. Where a light falls on a joist, it moves a few inches; the plan should say which way.

Ceilings under an attic

A recessed light in a ceiling with insulation above it must be rated for insulation contact (marked IC). An airtight (AT) rating also matters on a top-floor ceiling: every unsealed pot light is a hole that lets warm, moist indoor air into the attic in winter.

How high should pendants and a chandelier hang?

Over a kitchen island, the bottom of a pendant usually sits about 30 to 36 inches above the counter, high enough to see across and low enough to light the surface. Over a dining table the range is similar. In a room you walk under, a fixture needs head clearance first, and looks second.

1. Island pendants: space them so each covers its part of the counter, commonly about 24 to 30 inches between centres,, and keep the outer ones well in from the island ends. One long linear fixture does the same job with a single ceiling box.
2. Dining chandelier: a common guide is a fixture about 12 inches narrower than the table. Centre it on the table, not the room. If the table position is not final, ask for the box to be placed where the table will actually sit.
3. Heavy fixtures: a large chandelier or a ceiling fan needs a box rated for its weight and solid blocking between the joists. That blocking goes in before drywall; added later, it means opening the ceiling.
4. Double-height spaces and stairwells: decide now how a bulb will be changed. A fixture reachable only from scaffolding will stay dark for months after its first bulb fails.

Which colour temperature and brightness should you choose?

Colour temperature is measured in kelvin. Most homes look best at 2700K to 3000K, which reads as warm white. 3500K to 4000K is neutral and suits laundry rooms, garages and workshops. Above 5000K reads as blue-white daylight, which feels clinical in a living room at night.

The single most important rule is to keep one colour temperature per room. A kitchen with 3000K pot lights and 4000K under-cabinet strips looks patchy on a white quartz counter, and the difference shows most in exactly the place you look at most. Buy every fixture for the room with the same kelvin number printed on the box.

Check the colour rendering index (CRI) as well. A CRI of 90 or higher shows wood, skin, food and paint colours close to how they look in daylight; lower numbers make warm finishes look flat and grey. For brightness, compare lumens, not watts, because LED wattage says little about how much light you get.

How should switches and dimmers be planned?

Draw the switches the way you will walk through the house. Every switch belongs at the door you enter by, on the latch side, so you do not reach behind an open door in the dark. Then give each layer its own control, and put a dimmer on every layer you would ever want lower.

Two details save trouble later. First, LED fixtures and dimmers have to be matched: a dimmer that is not on the fixture maker's compatibility list can cause flicker, buzzing, or lights that will not dim below half. Second, many smart switches need a neutral wire in the switch box. Plenty of older GTA houses do not have one there, so if you might want smart switches, have the electrician run a neutral to each box while the walls are open.

What changes in kitchens, bathrooms and basements?

Each of these rooms has its own lighting problem: the kitchen has shadows on the counter, the bathroom has moisture and faces in a mirror, and the basement has little or no daylight. The fixes are different, so plan them room by room rather than with one rule for the house.

• Kitchen counters: ceiling lights behind you throw your shadow onto the counter. Under-cabinet strips solve it. Mount them toward the front edge of the cabinet so light falls on the work surface, and use a strip in a diffused channel so a polished counter does not reflect a row of LED dots. More on planning the room around how you cook is in our guide to kitchen layouts.
• Bathroom vanity: one light straight above the mirror shadows the eyes and chin. Light from both sides at face height, or a mirror lit around its edge, lights the face evenly. Fixtures over a tub or inside a shower must be rated for wet locations.
• Textured walls: a light close to a textured tile or a plaster wall throws long shadows across it. That is what makes a wave tile or a slatted wall look three-dimensional at night, and it also shows every uneven patch in flat drywall, so ask for a level-5 finish where a strip grazes a plain wall.
• Basements: low ceilings, ducts and bulkheads crowd the layout. Thin wafer lights and lighting along the bulkheads make a low room feel taller. Our basement finishing page explains how the ceiling is framed around ductwork.
• LED strip drivers: every LED strip runs from a driver (a small power supply). It must stay accessible, in a cabinet, a vented panel or a box with a cover, never buried behind drywall where it cannot be replaced.

Who is allowed to do the electrical work in Ontario?

In Ontario, electrical work done for pay in your home must be done by a Licensed Electrical Contractor, and it has to be filed with the Electrical Safety Authority (ESA), which inspects it. Ask for the ESA notification number before work starts and for the inspection result when it is finished.

This applies to new pot lights, new circuits, moved switches and new boxes, not only to panel work. A renovation in an older Toronto house can also uncover knob-and-tube or ungrounded wiring; with the walls open, it is the cheapest moment to replace it, and many insurers ask about it. Building permit questions are separate, and our guide to Toronto renovation permits covers them.

A lighting checklist for the walk-through before drywall

The last chance to change lighting cheaply is the walk-through after rough-in electrical and before insulation and drywall. Walk every room with the plan in hand and check each item below. Anything missed now is a hole in a finished ceiling later.

• Every fixture box matches the plan, and pendant and chandelier boxes are centred on the island or table, not on the room.
• Heavy fixtures and ceiling fans have rated boxes and blocking.
• Recessed lights in ceilings under insulation are IC rated, and airtight on top-floor ceilings.
• Each lighting layer has its own switch, and dimmers are shown where you want them.
• Switches sit on the latch side of each door, and stairs and long halls are switched from both ends.
• Switch boxes have a neutral if smart switches are a possibility.
• Under-cabinet, cove and niche strips have wiring and an accessible place for their drivers.
• Every fixture for a room is ordered in the same colour temperature, with CRI 90 or higher.

Lighting belongs in the plan for a kitchen renovation, bathroom renovation and whole-home renovation, and it should be drawn before the electrician starts. If you are planning a project in Toronto or the GTA, book an on-site consultation and bring the lighting questions with you.