This decision affects your bathroom every single day. Choose wrong, and you’ll deal with daily frustration—two people competing for mirror space during morning routines, or wasted vanity length with a double sink you never actually need.
The single versus double sink question isn’t about what looks better in photos. It’s about how you actually use your bathroom, how much space you have, and whether the benefits of two sinks justify the trade-offs in counter space and cost.
Many Ottawa homeowners default to “bigger is better” and install double vanities without thinking through whether they’ll actually use both sinks. Others stick with single sinks in primary bathrooms where a double vanity would genuinely improve daily routines.
This guide helps you make the right decision for your specific situation, covering space requirements, usage patterns, plumbing considerations, and what works best for different Ottawa home types and family structures.
Single Sink Bathroom Vanities Explained
Single sink vanities provide one sink with varying amounts of surrounding counter space, ranging from minimal to generous depending on overall vanity width.
Advantages of Single Sink Vanities
Counter space is the main advantage of single sink configurations. A 48-inch single sink vanity provides far more usable counter space than a 48-inch double sink vanity (which wouldn’t work anyway—too small for comfortable dual sinks).
With a single sink, you have room for toiletries, grooming products, decorative items, and daily-use items without crowding. This matters for people who spread out while getting ready or who keep many bathroom products accessible.
Cost savings are notable. Single sink vanities cost less than comparable-width double vanities. You’re paying for one sink, one faucet, and simpler plumbing rather than dual everything.
Installation is simpler and faster. Plumbing one sink takes less time than plumbing two, and there’s no need to coordinate spacing between dual sinks. This reduces labour costs during Ottawa bathroom renovations.
Flexibility in sink placement allows creative designs. You can position the sink centrally for balanced counter space, or offset it to create one larger counter area—useful if one person primarily uses the vanity.
Smaller bathrooms accommodate single sink vanities more easily. If your bathroom is compact, a single sink maximizes usable vanity width within your available space.
Best Applications and Scenarios
Guest bathrooms function perfectly with single sinks. Guests rarely use the bathroom simultaneously, so dual sinks provide no practical benefit.
Primary bathrooms where one person primarily uses the vanity don’t need double sinks. If your partner has a separate bathroom or uses the primary bathroom at different times, a generous single vanity works better than a cramped double vanity.
Powder rooms and small full bathrooms benefit from single sink configurations. These spaces rarely accommodate double vanities comfortably anyway.
Bathrooms with excellent counter space elsewhere don’t need to maximize vanity counter space. If you have built-in shelving, linen closets, or other storage and counter areas, you can choose vanity size based on other factors.
When you prioritize aesthetics over function, single sinks allow more dramatic design statements. A beautiful vessel sink or unique faucet becomes a focal point rather than competing with a second matching sink.
Counter Space Considerations
A 36-inch single sink vanity provides adequate counter space for most individuals. You’ll have approximately 16-20 inches of counter space on either side of a standard sink.
A 48-inch single sink vanity offers generous counter space—enough for multiple people’s products if they’re organized efficiently. This width works beautifully for primary bathrooms where counter space matters more than dual sinks.
A 60-inch single sink vanity provides exceptionally spacious counter areas. Some homeowners choose this configuration even in primary bathrooms, valuing the expansive counter space over a second sink they’d rarely use simultaneously.
Consider your actual counter space usage. If you keep products in drawers and vanity cabinets rather than on the counter, you need less counter space than someone who displays products openly.
Double Sink Bathroom Vanities Explained
Double sink vanities feature two sinks with varying amounts of space between them depending on overall vanity width.
Benefits of Double Sink Vanities
Simultaneous use is the primary advantage. Two people can brush teeth, wash faces, or complete morning routines at the same time without waiting or crowding each other.
Dedicated personal space gives each user their own area. “My side, your side” divisions prevent the territorial conflicts that sometimes arise with shared single sinks.
Increased storage often accompanies double vanities since they’re typically larger (60-72 inches). More vanity width means more drawers and cabinet space for toiletries and bathroom items.
Resale value benefits from double vanities in primary bathrooms, particularly in newer Ottawa neighbourhoods. Buyers in Kanata, Barrhaven, and Orleans expect double vanities in primary bathrooms of homes built after 1990.
Morning routine efficiency improves when two people need to get ready simultaneously. This matters for working couples, families with school-age kids, or anyone on tight morning schedules.
When Double Sinks Make Sense
Primary bathrooms shared by couples who get ready at the same time benefit most from double vanities. If you’re both at the vanity at 7 AM on weekday mornings, two sinks eliminate bottlenecks.
Families with multiple kids sharing a bathroom find double sinks reduce arguments and waiting. Two kids can brush teeth simultaneously rather than one waiting impatiently.
Jack-and-jill bathrooms between bedrooms work excellently with double vanities. Each bedroom user can claim one sink as their dedicated space.
When you have adequate wall space without sacrificing bathroom layout, double vanities work well. If your bathroom easily accommodates 60-72 inches of vanity, consider using that space for dual sinks.
Homes in newer Ottawa developments where buyers expect double primary bathroom vanities benefit from meeting this standard. It’s not mandatory, but deviation from neighborhood standards can affect resale appeal.
Family and Lifestyle Considerations
Consider peak bathroom usage times. If family members stagger bathroom use—some morning people, some evening people—you might not need simultaneous sink access.
Think about current and future needs. Young kids don’t need dual sinks now, but will they as teenagers? Conversely, if kids are leaving home soon, do you need dual sinks for empty-nester years?
Guest usage rarely requires double sinks. Even in homes with frequent overnight guests, bathroom use typically staggers enough that single sinks suffice.
Space Requirements Comparison
Understanding minimum and comfortable space requirements helps you decide if your bathroom accommodates double vanities appropriately.
Minimum Space for Single Sink
A single sink vanity requires minimum 24 inches of width, though 30-36 inches provides more comfortable counter space and storage.
Depth requirements are standard regardless of sink count—typically 18-21 inches from wall to vanity front edge.
Clearance in front needs at least 76 centimetres (30 inches) for comfortable standing and bending. More space improves comfort.
Minimum Space for Double Sink
Double sink vanities require minimum 60 inches (152 centimetres) of width. This allows two sinks spaced approximately 30 inches apart centre-to-centre. However, this minimum feels cramped.
Comfortable double vanity width is 66-72 inches (168-183 centimetres). This provides adequate counter space between sinks (20-24 inches) and doesn’t feel squeezed.
Depth remains the same as single vanities—18-21 inches is standard, with deeper vanities (22-24 inches) providing extra counter depth.
Front clearance needs at least 76 centimetres just like single vanities, though more space feels better when two people use the vanity simultaneously.
Bathroom Layout Impact
Double vanities consume significant wall length. In smaller bathrooms, this limits what else fits on that wall—storage cabinets, towel bars, or decorative elements might not fit.
Toilet placement relative to the vanity matters. Building codes require minimum 38 centimetres (15 inches) from toilet centre to any fixture. A too-wide vanity in a small bathroom might create uncomfortably tight toilet spacing.
Shower or bathtub placement affects available vanity width. If your tub occupies significant wall length, you might not have 60-72 inches remaining for a double vanity without awkward layout compromises.
Door swing must be considered. Ensure your bathroom door can open fully without hitting an extended vanity. In tight bathrooms, single vanities sometimes work better for this reason.
For comprehensive guidance on vanity sizing and measuring your bathroom properly, check our complete vanity size guide.
Plumbing Considerations for Ottawa Homes
Plumbing requirements differ significantly between single and double sink configurations, affecting installation complexity and cost.
Single Sink Plumbing
Single sink plumbing is straightforward. You need one set of hot and cold water supply lines and one drain connection. This simplicity reduces installation time and cost.
Existing plumbing often accommodates single sink replacement easily. If you’re replacing an old single vanity with a new single vanity, plumbing modifications are minimal or unnecessary.
Shut-off valves for one sink are simple to access and operate. This matters for future maintenance or repairs.
Double Sink Plumbing Requirements
Double sinks require two complete sets of plumbing—two hot supply lines, two cold supply lines, and two drain connections. This doubles plumbing materials and increases installation labour.
Supply line routing needs planning. Water must reach both sinks with adequate pressure. In some cases, this requires additional supply line work beyond the vanity area.
Drain configuration for double sinks varies. Some installations use separate drain pipes for each sink meeting at a common trap. Others use a continuous waste system where both sinks drain into a shared pipe. Your plumber will recommend the best approach for your situation.
Venting requirements may need addressing. Proper drain venting prevents slow drainage and gurgling. Double sinks sometimes require venting modifications, particularly when adding a second sink to a bathroom that previously had one.
Retrofitting Older Ottawa Homes
Adding a double vanity where a single vanity existed requires plumbing modifications. Your contractor must route new supply lines and drain pipes to the second sink location.
In older Ottawa homes—those century homes in the Glebe, Centretown, and Sandy Hill—plumbing access can be challenging. Walls may be plaster over wood lath, and original plumbing may be in awkward locations.
Basement access helps significantly. If your bathroom is above an accessible basement, running new plumbing lines is much easier. Upper-floor bathrooms without basement access below require more invasive work.
Cost implications are substantial. Adding plumbing for a second sink typically adds $500-1,500 to renovation costs depending on bathroom layout and existing plumbing access. Get specific quotes from plumbers before committing to double vanity installation.
For detailed information about bathroom vanity installation including plumbing considerations and Ontario building code requirements, see our installation guide.
Making Your Decision: Single or Double?
Several factors help you determine which configuration suits your Ottawa bathroom renovation.
Decision Framework
Start with space. If your bathroom comfortably accommodates 60+ inches of vanity without layout compromises, double vanities are possible. If space is tight, single vanities work better.
Consider usage patterns honestly. When do household members use the bathroom? If peak times overlap regularly, double sinks provide genuine benefits. If bathroom use staggers naturally, single sinks suffice.
Think about current and future needs. Will your bathroom usage patterns change in coming years? Empty-nesters rarely need dual sinks teenagers once required.
Evaluate budget flexibility. If renovation budget is tight, single sink vanities cost less both for the vanity itself and for installation. If budget allows, double vanities are worth considering for busy bathrooms.
Assess your priorities. Is maximum counter space more valuable than simultaneous use? Your specific priorities guide the right decision.
Ottawa Home Type Considerations
Older homes in traditional Ottawa neighbourhoods (Glebe, Centretown, Westboro) often have smaller bathrooms that don’t accommodate double vanities comfortably. These homes work well with single vanities, particularly furniture-style vanities that complement the home’s traditional character.
Suburban homes in Kanata, Barrhaven, and Orleans built within the past 20-30 years typically have primary bathrooms sized for double vanities. These bathrooms measure 210+ centimetres wide, easily accommodating 60-72 inch double vanities.
Modern condos vary widely. Luxury condos often have generous primary bathrooms suitable for double vanities. Modest condos typically require single vanities in primary bathrooms and definitely in secondary bathrooms.
Post-war homes from the 1950s-1970s throughout Ottawa vary in bathroom size. Some accommodate double vanities; others work better with single configurations. Measure carefully rather than assuming.
Resale Value in Ottawa Market
Primary bathrooms in homes built after 1990 benefit from double vanities for resale purposes. Ottawa buyers in suburban areas like Kanata and Barrhaven expect dual sinks in primary bathrooms.
However, poorly executed double vanities hurt resale value more than appropriately sized single vanities. A cramped 54-inch double vanity looks worse than a generous 48-inch single vanity with ample counter space.
Guest bathrooms don’t need double sinks for resale value. Single vanities work perfectly fine and buyers don’t penalize homes for single sink guest bathrooms.
Older neighbourhood expectations differ. Century homes in the Glebe or Sandy Hill aren’t expected to have double primary vanities like newer suburban homes. Appropriate single vanities suit these properties well.
Professional Design and Installation
Whether you choose single or double sink vanities, professional installation ensures proper function and longevity.
DBK Ottawa has extensive experience installing both single and double sink bathroom vanities throughout Ottawa, Orleans, Kanata, Barrhaven, and surrounding areas. We help assess your bathroom layout, usage patterns, and needs to recommend the configuration that works best for your situation.
Our team handles all plumbing requirements for both single and double sink installations, including routing supply lines, connecting drains, ensuring proper venting, and complying with Ontario Building Code requirements.
For complete information about bathroom vanities including sizing, materials, and trends, check our comprehensive bathroom vanity guide for Ottawa homeowners.
Ready to choose between single and double sink vanities for your bathroom? Contact us for expert assessment and professional installation throughout Ottawa and surrounding communities.
Frequently Asked Questions
How much space do I need for a double sink vanity?
Double sink vanities require minimum 60 inches (152 centimetres) of wall width, though 66-72 inches (168-183 centimetres) provides comfortable spacing. You also need at least 76 centimetres of clearance in front of the vanity. Sink centres should be approximately 30-36 inches apart for comfortable simultaneous use. Ensure adequate spacing from toilets (minimum 38 centimetres from toilet centre to vanity edge) and adequate room for shower or bathtub placement. Measure your bathroom carefully before committing to double sink installation.
Are double sink vanities worth it?
Double sink vanities are worth it if household members regularly use the bathroom simultaneously—couples getting ready for work together, kids needing to brush teeth at the same time, or busy morning routines with overlapping schedules. They’re not worth it if bathroom use naturally staggers, if you value counter space more than dual sinks, if your bathroom is too small to accommodate double vanities comfortably, or if budget is tight. The value depends entirely on your specific usage patterns and spatial constraints.
Can I convert a single sink vanity to double?
Converting single to double sink vanities requires adequate vanity width (minimum 60 inches, preferably 66+ inches), additional plumbing for the second sink including hot/cold supply lines and drain connections, potential venting modifications, and countertop replacement with holes for two sinks. Cost typically ranges $1,000-2,500 including plumbing labour, new countertop, second sink, and second faucet. In older Ottawa homes with limited plumbing access, costs can be higher. Ensure your bathroom layout accommodates the wider vanity before starting conversion work.
What’s better for resale value in Ottawa?
For primary bathrooms in homes built after 1990 in areas like Kanata, Barrhaven, and Orleans, double vanities add resale value because buyers expect them. For older Ottawa homes in traditional neighbourhoods (Glebe, Centretown), appropriately sized single vanities work fine and buyers don’t penalize their absence. Guest bathrooms don’t need double sinks for resale appeal. The key is matching neighborhood standards and ensuring your vanity configuration makes sense for the bathroom size rather than forcing an undersized double vanity into inadequate space.
How far apart should double sinks be?
Double sinks should be spaced approximately 30-36 inches apart centre-to-centre for comfortable use. Minimum spacing is 30 inches, which works but feels somewhat cramped. Ideal spacing is 34-36 inches, providing adequate personal space and counter area between sinks. This translates to vanity widths of 60 inches minimum (cramped) or 66-72 inches for comfortable spacing. Measure from the centre of one drain to the centre of the other drain when planning. Adequate spacing prevents elbow-bumping during simultaneous use and provides functional counter space between sinks.
Do double vanities use more water?
Double vanities don’t inherently use more water—they simply have two sinks available. Water usage depends on how many people use the bathroom and their habits, not sink count. Two people brushing teeth simultaneously at a double vanity use the same total water as two people brushing teeth sequentially at a single sink. However, having two sinks might encourage longer concurrent use periods. Water consumption relates to user behaviour rather than sink count. Modern low-flow faucets reduce water usage regardless of whether you have one or two sinks.
Need help deciding between single and double sink bathroom vanities? Contact DBK Ottawa for expert assessment of your bathroom layout and usage needs. We serve Ottawa, Orleans, Kanata, Barrhaven, and surrounding areas with professional bathroom renovation services.