Quick Takeaways
- Kitchen and bathroom lighting and ventilation are infrastructure decisions, not finishing touches. Both need to be planned before walls are closed, not after.
- A kitchen needs three layers of lighting: ambient, task, and accent. Skipping task lighting is the most common kitchen lighting mistake.
- Under-cabinet lighting matters more than the chandelier. It is where you actually work.
- Bathroom vanity lighting should flank the mirror on both sides, not sit above it. Top-mounted lighting creates shadows on the face.
- A ducted range hood is always better than a recirculating one when ducting is possible.
- The bathroom exhaust fan is one of the most important fixtures in the room. Most are undersized. Most run for too short a time.
Kitchen and bathroom lighting and ventilation are the two systems in a renovation that most homeowners plan last and budget for least. Both decisions affect the comfort, safety, and long-term performance of the space every single day. Both also need to be resolved before the walls close, because moving a recessed light or rerouting a duct after drywall is expensive.
This guide covers the three layers of kitchen lighting, bathroom lighting for task and safety, range hood sizing and duct routing, and bathroom exhaust ventilation. It does not cover circuit sizing or electrical panel planning. Those are in the Fixtures and Systems Guide. It does not cover light fixture styles or specific product recommendations. This is a functional planning guide.
For the broader context of how lighting and ventilation fit into your overall renovation planning, start with the Kitchen and Bathroom Materials Overview Guide.
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Kitchen and Bathroom Lighting and Ventilation: The Three Layers of Kitchen Lighting
A well-lit kitchen uses three distinct layers of light that serve three different functions. Most renovation budgets plan for one or two and skip the third. The result is a kitchen that looks fine in photos and is frustrating to work in. All three layers are needed.
Ambient Lighting: The Foundation Layer of Kitchen Lighting
Ambient lighting is the general light that fills the room. In a kitchen, this is usually recessed downlights (pot lights), a flush-mount ceiling fixture, or track lighting. It provides the baseline level of light in the space.
Recessed lighting: The most common choice in GTA kitchen renovations. For an 8-foot ceiling, 4-inch fixtures provide a focused beam and are appropriate for task-adjacent positions. 6-inch fixtures cast a wider spread and work better for general fill light. A common rule of thumb is to divide the ceiling height by 2 to get the spacing between fixtures in feet. For a 9-foot ceiling, space recessed lights approximately 4.5 feet apart.
Track lighting: Adjustable heads on a ceiling-mounted track allow you to direct light where it is needed. Useful in kitchens where the layout makes recessed light placement difficult. Less clean-looking than recessed but more flexible.
Task Lighting: Where You Actually Work
Task lighting is the most important layer in a kitchen. It is the light that illuminates the surfaces where you chop, mix, read recipes, and prepare food. Without adequate task lighting, you are working in your own shadow because the ambient light is behind you.
Under-cabinet lighting: Installed underneath the upper cabinets to light the countertop directly below. This is the single most impactful lighting addition in most kitchens. LED strip lighting is the most common format: continuous, even, and low profile. Puck lights are individual fixtures spaced along the underside of the cabinet, adequate but they create brighter spots and darker gaps between fixtures. LED strip is better. The power connection for under-cabinet lighting must be planned as part of the rough electrical work. See the Fixtures and Systems Guide for outlet placement requirements.
Pendant lights over an island: Pendants at island height provide task light for the island work surface and double as a design element. They are covered in detail in the pendant lights section below.
Accent Lighting: The Layer Most Kitchens Skip
Accent lighting is not essential but it changes how a kitchen feels in the evening more than any other single lighting decision. It adds depth, warmth, and a sense that the kitchen was thoughtfully designed rather than simply illuminated.
Inside glass cabinet lighting: LED strip or puck lights inside glass-front cabinet doors illuminate the interior and the items displayed. This works well with glassware and dishes that benefit from being shown rather than hidden. The electrical provision for in-cabinet lighting needs to be planned before cabinet installation. For glass cabinet door considerations, see the Cabinetry Guide.
Toe-kick lighting: LED strip lighting at the base of the lower cabinet toe kick. Creates a floating effect and provides useful wayfinding light in a dark kitchen. One of the most inexpensive accent additions with a significant visual impact.
Above-cabinet lighting: LED strips above the upper cabinets washing light up toward the ceiling. Creates a glow that adds perceived ceiling height and warmth. Only works well in kitchens without a gap between the cabinet top and the ceiling. If your cabinets go to the ceiling, this option is not available.
Pro Tip
Plan your lighting in layers from the countertop up, not from the ceiling down. Start with what you need at the work surface (task lighting), then decide what ambient fill you need above it, then consider what accent additions make sense. Most homeowners do it the other way around and end up with a beautifully lit ceiling and a dark countertop.
Kitchen and Bathroom Lighting: Recessed Light Placement and Dimmers
Where you put recessed lights is more important than how many you install. The most common kitchen lighting mistake is placing recessed lights in a grid centred on the room ceiling. This lights the middle of the room and leaves the countertops in shadow.
Pendant Lights Over a Kitchen Island: Sizing and Placement
Pendant lights over an island are one of the most visible lighting and ventilation decisions in a kitchen. They are also one of the most frequently specified incorrectly. Three dimensions matter: size relative to the island, hanging height, and number relative to island length.
Colour Temperature: What 2700K vs 4000K Actually Means in a Kitchen
Colour temperature is measured in Kelvin and describes the colour of the light output. Getting this wrong is one of the most common kitchen and bathroom lighting and ventilation planning mistakes. The numbers are not intuitive: higher Kelvin means cooler, bluer light, not warmer.
Important
Keep colour temperature consistent within a room. Mixing 2700K recessed lights with 4000K under-cabinet strips creates a visually uncomfortable contrast that is hard to identify but immediately noticeable. All fixtures in a kitchen should sit within the same colour temperature range, ideally within 200K to 300K of each other.
Colour temperature also affects how your countertop and tile selections appear under artificial light. A warm stone countertop can look very different under 2700K versus 4000K. Always evaluate material samples in the actual room lighting conditions before finalising selections. For more on surface material selection, see the Surfaces Guide.
Kitchen and Bathroom Lighting and Ventilation: Bathroom Lighting for Task and Safety
Bathroom lighting is different from kitchen lighting in one important respect: the primary function is task-critical face illumination, not general room illumination. A bathroom where you cannot see your own face clearly is a design failure regardless of how attractive the fixtures are.
Vanity Lighting: Side-Mounted vs Top-Mounted
This is the most important bathroom lighting decision. Side-mounted sconces flanking the mirror on both sides provide even, shadow-free illumination across the face. This is how professional makeup lighting works. The light comes from both sides simultaneously, eliminating the shadows that top-mounted lighting creates under the chin, nose, and eye sockets.
Top-mounted lighting above the mirror, a single bar fixture or a row of globe lights, is the most common bathroom lighting choice and the least functional. It creates harsh top-down shadows that make face illumination difficult. It is better than nothing but not as good as flanking sconces.
Sconce sizing and placement: Position sconces at eye level, approximately 60 to 65 inches from the floor to the centre of the fixture. They should sit 28 to 36 inches apart, roughly the width of the mirror. Too close together and they create glare. Too far apart and the light does not converge on the face evenly.
Mirror with Integrated Lighting
Illuminated mirrors have LED strips built into the frame perimeter or behind a frosted panel. They are increasingly common in GTA bathroom renovations because they combine the mirror and vanity lighting function into one fixture, which simplifies the wall above the vanity and is particularly useful in smaller bathrooms where wall space for separate sconces is limited.
Illuminated mirrors require an electrical connection at the mirror location. This must be provided during rough electrical work. The electrical provision should be centred on the mirror location at the appropriate height. Most illuminated mirrors are hardwired, not plug-in.
Shower Lighting: Wet Location Fixtures and Lumen Requirements
Lighting inside a shower enclosure must be rated for wet locations, not just damp locations. This is a code requirement and a safety one. Standard recessed fixtures are rated for dry or damp locations only. Shower fixtures must have a wet-location rating (IP65 or higher) and are typically sealed with a gasket around the lens.
A single recessed fixture directly over the shower is usually adequate for a standard 36×36 or 36×48 inch shower. Larger walk-in showers benefit from two fixtures positioned to cover the full floor area without creating a shadow zone. For tile selections that affect how light reads inside the shower enclosure, see the Surfaces Guide.
Lumen output: A shower recessed light should provide at least 400 to 600 lumens for a standard shower. A darker tile colour absorbs more light and may require higher output. A lighter tile reflects more light. The tile colour selection affects how bright the shower feels regardless of the fixture output.
Night Lighting: Practical for Family Bathrooms
A bathroom used by multiple family members at night benefits from a low-level night light that provides wayfinding without triggering full ambient light. Toe-kick LED lighting at the base of the vanity, a plug-in night light, or a motion-activated light under the vanity are all practical solutions.
Motion-activated night lights on a separate low-wattage circuit are increasingly being specified in family bathroom renovations. They come on automatically at a low level when someone enters the bathroom at night and switch off after a set period. This works particularly well for bathrooms shared by children. The electrical provision for a motion-activated fixture must be planned during rough electrical work.
Bathroom Lighting Code Requirements in Ontario
Under the Ontario Electrical Safety Code, bathroom fixtures must be rated appropriately for their location relative to water:
- Zone 0 (inside the bathtub or shower basin): only IPX7 or higher rated fixtures permitted. This zone essentially prohibits most standard lighting.
- Zone 1 (directly above the tub or shower up to 2.25m): fixtures rated IPX4 minimum. Wet location rated fixtures required.
- Zone 2 (up to 0.6m outside the shower or tub perimeter): damp location fixtures acceptable.
- Outside all zones: standard fixtures acceptable if GFCI protected. All bathroom outlets must be GFCI protected regardless of zone.
Pro Tip
Specify bathroom lighting at 3000K to 3500K. Warm white (2700K) can make skin tones look too golden and makes it harder to see clearly for precision tasks like applying makeup or shaving. True daylight (5000K+) is harsh and unflattering. The 3000K to 3500K range provides enough colour accuracy for task performance while remaining warm enough to be comfortable.
Kitchen and Bathroom Ventilation: Range Hood Sizing, Duct Routing, and CFM
In kitchen and bathroom lighting and ventilation planning, the range hood is where most renovation projects are undersized and under-planned. A range hood that cannot move enough air allows grease, moisture, and cooking odours to accumulate on every surface in the kitchen. Your cabinet finish, your tile, and your countertop all degrade faster in a poorly ventilated kitchen.
Ducted vs Recirculating (Ductless) Range Hoods
A ducted range hood exhausts air through a duct to the exterior. A recirculating range hood filters air through charcoal filters and returns it to the kitchen. Ducted is always better than recirculating when ducting is possible. This is not a preference. It is a functional difference.
Recirculating hoods remove some grease particles through the filter but return moisture and much of the cooking odour to the kitchen. They do not remove steam. In a busy kitchen, a recirculating hood is significantly less effective than a ducted system.
Use a recirculating hood only when exterior ducting is genuinely impossible, such as in a kitchen on an upper floor of a multi-storey condo with no duct path to the exterior. In a house, ducting is almost always achievable and worth doing. If you have a question about whether ducting is feasible in your specific kitchen, that is a conversation to have early with your contractor. The Fixtures and Systems Guide covers range hood specification alongside other appliance decisions.
CFM Sizing: How to Calculate What You Need
CFM (cubic feet per minute) is the airflow rating of the hood. A hood with insufficient CFM for the cooktop it serves is only marginally better than no hood at all.
For gas ranges: 100 CFM per 10,000 BTU of total cooktop output. A 4-burner gas range producing 60,000 BTU total would require a 600 CFM hood minimum.
For electric and induction ranges: 100 CFM per linear foot of cooking surface is a reasonable starting calculation. A 30-inch range (2.5 feet) needs approximately 250 CFM minimum.
Practical note: These are minimums. Adding 20 to 30% above the calculated minimum accounts for real-world inefficiency, duct bends, and longer duct runs. Undersized ventilation is far more common than oversized ventilation in residential kitchens.
Duct Routing: Short, Straight Runs Are Most Efficient
Every turn in a duct run reduces effective CFM. A 90-degree elbow is equivalent to approximately 10 feet of straight duct in terms of airflow resistance. A duct with four elbows has the effective resistance of 40 additional feet of straight run. Long, winding duct paths dramatically reduce the actual airflow delivered by the hood.
The shortest, most direct path from hood to exterior is always the best duct routing. If your kitchen is on an exterior wall, a short horizontal run through the wall is ideal. If the range is on an interior wall, the duct typically runs up through the ceiling and out the roof or soffit, which is longer but feasible. Minimise bends and use smooth round duct rather than flexible corrugated duct wherever possible — corrugated duct creates significant additional airflow resistance.
Make-Up Air: Required for High-CFM Hoods in Tight Homes
When a powerful range hood exhausts a large volume of air to the exterior, replacement air must come from somewhere. In an older home with natural air leakage, this is not an issue. In a newer, tightly sealed home, a 600 CFM or higher range hood operating at full power can create negative air pressure, which causes problems including back-drafting of gas appliances and combustion equipment.
Ontario Building Code requires make-up air provisions for range hoods exceeding a certain CFM rating in airtight homes. If you are specifying a high-output range hood in a newer or recently air-sealed home, discuss make-up air requirements with your HVAC contractor during the design phase. This is not a conversation to have after the hood is installed.
Island Ventilation: Why It Needs Higher CFM
An island range hood hangs from the ceiling with no wall behind it to help capture rising cooking vapour. On a wall-mounted range, the wall and the hood together contain the steam and grease. On an island cooktop, vapour can escape to the sides before the hood captures it.
For this reason, island range hoods should be sized approximately 150% of the CFM calculated for the same cooktop on a wall-mounted range. The duct routing for an island hood also runs through the ceiling, which typically involves more bends than a wall-mounted installation. Factor both into the sizing decision. The structural requirements for ceiling-hung island hoods must also be assessed during the framing stage.
Pro Tip
A range hood at 50% speed running continuously is more effective at keeping a kitchen clean than the same hood at 100% speed turned on only when cooking gets smoky. Run the hood before you start cooking, keep it running during cooking, and continue for 5 to 10 minutes after. Grease and moisture accumulate on cabinet surfaces and countertops not just during high-heat cooking but during every cooking session. Consistent use of the hood at moderate speeds extends the life of your surfaces. For cabinet finish maintenance considerations, see the Cabinetry Guide.
Kitchen and Bathroom Ventilation: Fan Sizing, Humidity Control, and Code
In kitchen and bathroom lighting and ventilation planning, the bathroom exhaust fan is one of the most important fixtures in the room. It removes moisture that would otherwise condense on surfaces, penetrate grout, and eventually cause damage behind the tile. Most bathroom fans are undersized and most run for too short a time to do their job effectively. For waterproofing systems that prevent moisture from getting behind tile in the first place, see the Underfoot Guide.
Fan Sizing: HVI Guidelines for Bathroom CFM
The Home Ventilating Institute (HVI) guideline for bathroom exhaust fans is 1 CFM per square foot of floor area for bathrooms up to 100 square feet. A standard 5×8 foot bathroom (40 square feet) needs a minimum 50 CFM fan. The minimum fan rated in most building codes is 50 CFM.
For bathrooms with a separate shower enclosure, add 50 CFM. For bathrooms with a jetted tub, add 50 CFM. For bathrooms with a toilet in an enclosed water closet, add 50 CFM. Large open bathrooms may benefit from two fans positioned to ensure coverage of both the shower zone and the vanity zone.
Higher CFM fans are generally better in bathrooms where the household produces a lot of steam, such as families with teenagers taking long showers. Oversizing the fan is not a significant problem in most residential bathrooms. Undersizing is.
Humidity Sensors vs Timers vs Manual Switches
Manual switch: The fan runs only when someone turns it on and off. The most common configuration. The least effective because most people turn the fan off too soon after showering or forget to turn it on at all.
Timer switch: Fan runs for a set period after being activated. Ensures the fan continues to run after the user leaves the bathroom. A 20 to 30-minute timer is typically enough to remove residual moisture from a shower. A practical and affordable improvement over a manual switch.
Humidity sensor: Fan activates automatically when relative humidity in the bathroom exceeds a set threshold and runs until humidity returns to normal levels. The most effective control method because it responds to actual moisture conditions rather than a timer approximation. Worth specifying in a primary bathroom, particularly in a humid Ontario climate.
Ontario Code Requirements for Bathroom Exhaust Fans
The Ontario Building Code requires mechanical ventilation in all bathrooms that do not have an operable window providing a minimum net area of 0.3 square metres. In practice, this means most interior bathrooms and most bathrooms undergoing renovation will require a code-compliant exhaust fan.
The fan must vent to the exterior, not into an attic or wall cavity. Venting a bathroom fan into the attic is a common error in older renovations that creates significant moisture damage in the attic framing and insulation over time. The duct must terminate with a proper exterior cap that prevents back-drafting and keeps birds and insects out.
Combined Light and Fan Units: When They Work
Combined light and exhaust fan units serve both functions from a single ceiling box. They are appropriate for smaller bathrooms, powder rooms, and secondary bathrooms where ceiling space is limited and a dedicated exhaust fan location would be difficult to achieve separately.
The limitation: if the light and fan share a switch, the fan only runs when the light is on. If they have separate switches, the controls are independent and more useful. In a bathroom where the fan is the primary ventilation strategy, a combined unit with independent switching is significantly better than one controlled by a single switch.
One Thing Worth Remembering
Kitchen and bathroom lighting and ventilation decisions made late in a renovation are always more expensive and less effective than decisions made early. Both systems require electrical rough-in work, duct routing, and structural provisions that must happen before walls close. Make these decisions before your contractor meeting, not at the end of it.
Frequently Asked Questions About Kitchen and Bathroom Lighting and Ventilation
How many recessed lights do I need in my kitchen?
Divide the ceiling height by 2 to get the approximate spacing between fixtures. Position them 18 to 24 inches from the cabinet wall, over the countertop surface rather than centred in the room. The number depends on the kitchen size and the fixture coverage diameter. A common error is adding more fixtures without adjusting their position. Fewer lights in the right locations outperform many lights in the wrong ones.
What is the best height to hang pendant lights over a kitchen island?
30 to 36 inches between the bottom of the pendant and the countertop surface is the standard guideline. Below 30 inches and they obstruct sightlines and feel too close. Above 36 inches and they lose their function as task lighting. Taller ceilings allow the lower end of this range because the visual proportion of the room accommodates it.
What colour temperature should I use for kitchen lighting?
2700K to 3000K for warm-toned kitchens with natural wood, warm stone, or warm cabinet colours. 3500K to 4000K for contemporary kitchens with cool or neutral palettes. Keep all fixtures in the same room within 200K to 300K of each other to avoid uncomfortable contrast. Do not mix warm and cool light sources in the same space.
Why is top-mounted vanity lighting in bathrooms not ideal?
A single fixture above the mirror creates top-down shadows under the chin, nose, and eye sockets. This is the opposite of what you want for applying makeup or shaving accurately. Sconces flanking both sides of the mirror provide light from both sides simultaneously, eliminating facial shadows. If side sconces are not possible due to space constraints, an illuminated mirror with integrated side lighting is the next best option.
Do I need a wet-location rated fixture in my shower?
Yes. Any fixture inside the shower enclosure must be rated for wet locations, which means an IP65 or higher rating with a sealed, gasketed lens. Standard recessed fixtures are rated for dry or damp locations only. Using a dry-location fixture inside a shower is a code violation and a safety hazard. Confirm the wet-location rating of any shower fixture before purchasing.
How do I calculate what CFM range hood I need?
For gas ranges, use 100 CFM per 10,000 BTU of total cooktop output. For electric or induction ranges, use 100 CFM per linear foot of cooking surface. Add 20 to 30% above the calculated minimum to account for duct bends and real-world efficiency loss. Island hoods should be sized at approximately 150% of the equivalent wall-mounted installation because they lack a rear wall to help capture rising vapour.
Is a recirculating range hood worth installing if I cannot duct to the exterior?
A recirculating hood is better than no hood at all. It captures some grease particles through the filter. It does not remove moisture or cooking odours effectively. If exterior ducting is genuinely impossible, use a recirculating hood and replace the charcoal filters on schedule. But exhaust every other option for ducting before defaulting to recirculating. Your contractor can assess duct routing feasibility that may not be obvious at first look.
How big should my bathroom exhaust fan be?
The HVI guideline is 1 CFM per square foot for bathrooms up to 100 square feet. Add 50 CFM for a separate shower enclosure, 50 CFM for a jetted tub, and 50 CFM for a toilet in a separate water closet. When in doubt, go larger rather than smaller. An oversized bathroom fan causes no practical problems. An undersized one allows moisture to accumulate on surfaces and eventually behind them.
What is a humidity sensor on a bathroom exhaust fan and is it worth it?
A humidity sensor activates the fan automatically when relative humidity in the bathroom exceeds a set level and runs until it normalises. It is the most effective control method because it responds to actual moisture conditions rather than timers or human memory. Worth specifying in any primary bathroom, particularly in Ontario’s humid climate. The cost premium over a standard fan is modest relative to the benefit.
Can I vent a bathroom fan into my attic?
No. Bathroom exhaust fans must vent to the exterior through a proper duct terminating in an exterior cap. Venting into the attic is a common error in older renovations that introduces significant moisture into the attic assembly, promoting mould growth in the insulation and framing. The duct must exit the building envelope and terminate with a cap that prevents back-drafting and keeps pests out.
Talk to Our Kitchen and Bathroom Lighting and Ventilation Experts in Person
Lighting and ventilation decisions are easier to evaluate when you can see completed renovations in real spaces. We work with GTA homeowners from two locations. You can also browse our finished projects on Houzz.
Richmond Hill Office 10815 Bathurst St, Unit 5 | Woodbridge Office 8A, 40 Innovation Dr
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