Single vs Double Vanity Units: Which Is Right for You?

 

A single vanity unit features one basin, typically with storage underneath or alongside. A double vanity unit has two basins, usually sharing a countertop or cabinet. The biggest practical difference is one washing area versus two. Single vanity units generally suit smaller bathrooms, en-suites and individual use. Double vanity units work particularly well for couples, family bathrooms and larger spaces. The right choice depends on available space, number of users, storage needs, plumbing, budget and overall layout. A double vanity is not automatically better simply because it has two basins — functionality and fit matter more than the number of sinks.

What Is a Single Vanity Unit?

A single vanity unit is a bathroom basin combined with storage, designed around one sink. Configurations range from compact wall-hung units to floor-standing cabinets with drawers, cupboards or open shelving. Storage options include soft-close drawers, internal organisers and countertop space for everyday items. Both wall-hung (floating) and floor-standing styles are widely available. Single units suit en-suites, guest bathrooms, compact family bathrooms and spaces mainly used by one person at a time.

Where Does a Single Vanity Unit Work Best?

Single vanities excel in en-suites, small family bathrooms, guest bathrooms and compact spaces. They are ideal where one person typically uses the basin at a time, or where floor and wall space are limited. Their smaller footprint leaves room for other fixtures and better circulation.

Common Single Vanity Unit Sizes

Widths commonly range from 400 mm to 900 mm, with options such as 400 mm, 500 mm, 600 mm, 700 mm, 800 mm and 900 mm. Manufacturers offer wider single units too. Bathroom Mountain, for example, lists vanity widths from 400 mm up to 1,800 mm, with larger sizes often used for double-basin configurations. There is no single universal “standard” size — the best width depends on your wall space and layout.

What Is a Double Vanity Unit?

A double vanity unit incorporates two basins within one vanity arrangement. The basins may share a continuous countertop and cabinet or sit in an integrated design that still provides separate washing areas. This setup offers greater countertop and storage potential but usually requires more wall and floor space than a single unit.

Where Does a Double Vanity Unit Work Best?

Double vanities are well suited to master bathrooms, larger en-suites, family bathrooms and homes where couples regularly get ready at the same time. They shine in spaces that can accommodate the extra width without compromising movement around the toilet, shower or door.

Common Double Vanity Unit Sizes

Typical widths include 1,200 mm, 1,400 mm, 1,500 mm, 1,600 mm and 1,800 mm. Exact dimensions vary by manufacturer and basin configuration. Always check the specific product’s installation requirements rather than assuming a fixed “standard” size.

Single vs Double Vanity for Bathroom Size

Available floor and wall space should guide the decision. Houzz’s 2025 UK study found that 40% of renovated bathrooms measured between 5 and 9.99 m², while 39% were under 5 m². This shows that a substantial proportion of UK bathrooms remain relatively compact, making space efficiency a priority for many homeowners.

Single vs Double Vanity for Storage

A double vanity does not automatically deliver twice the storage. Capacity depends on the cabinet’s internal design — number and depth of drawers, cupboard configuration, organisers and how the space is divided. Single units can still offer excellent storage when well designed, while poorly planned double units may leave shared areas cluttered.

Pros and Cons of Single Vanity Units

Advantages of a Single Vanity

1. Takes up less space

2. Works well in compact bathrooms

3. Usually costs less

4. Simpler installation

5. Easier plumbing

6. Greater flexibility with bathroom layout

7. More wall space available for mirrors or additional storage

Disadvantages of a Single Vanity

• Only one person can comfortably use the basin at a time

• Less countertop space

• Potentially less storage

• Less convenient for couples who share the bathroom regularly

Pros and Cons of Double Vanity Units

Advantages of a Double Vanity

1. Two people can use the bathroom simultaneously

2. More countertop space

3. Separate washing areas

4. Potentially more storage

5. Useful for busy family bathrooms

6. Can create a strong visual focal point

Interest in double vanities is rising: Houzz reported a 746% increase in searches for “double vanity” in its 2025 UK Emerging Trends report. This reflects search interest rather than confirmed purchasing behaviour.

Disadvantages of a Double Vanity

• Requires more space

• Usually costs more

• More complicated plumbing

• Higher installation requirements

• Can make a small bathroom feel cramped

• Two basins are unnecessary for some households

Which Is Better for a Small Bathroom: Single or Double Vanity?

For most compact bathrooms, a single vanity is the more space-efficient option.

Why Single Vanities Work Better in Small Bathrooms

They have a smaller footprint, allow easier circulation, offer more flexibility around the toilet and shower, create less visual bulk and leave room for other fixtures.

When Can a Double Vanity Work in a Small Bathroom?

A double vanity can still succeed when the layout is efficient, a wider wall is available, other fixtures do not compromise circulation, a slim-depth unit is chosen, and the homeowner prioritises two basins. It is not impossible — careful planning is essential.

Which Is Better for Couples: Single or Double Vanity?

Why Couples May Prefer a Double Vanity

Simultaneous use, separate basins, individual storage options, reduced sharing of the washing area and extra countertop space all add convenience for couples with overlapping morning or evening routines.

When a Single Vanity May Still Be Enough for Couples

Different morning schedules, limited bathroom space, budget constraints or one person typically using the bathroom at a time can make a well-designed single vanity perfectly adequate.

Single vs Double Vanity for Family Bathrooms

Consider the number of household members, morning routines, children, storage needs, cleaning requirements, durability and countertop space. Families often benefit from robust materials and easy-clean surfaces.

Storage Matters More Than Basin Count

Families should assess the number of drawers, drawer depth, cupboard configuration, internal organisers, easy-clean surfaces and moisture resistance. Houzz’s 2025 UK research found that 77% of respondents prioritised a bathroom that is easy to clean, while easy-access storage and good lighting mattered to almost half.

How Much Space Do You Need for a Double Vanity?

Key factors include available wall width, vanity depth, basin width, door swing, shower enclosure, toilet position, user circulation space, mirror width and plumbing location.

Measure the Wall Before Buying

1. Measure available wall width.

2. Measure available depth.

3. Mark existing plumbing.

4. Check door and shower clearance.

5. Check basin projection.

6. Allow practical space around other fixtures.

7. Compare measurements with the manufacturer’s installation requirements.

For accessibility-focused projects, refer to recognised planning guidance such as NKBA bathroom planning recommendations rather than relying on generic clearance figures.

What About Plumbing for Single vs Double Vanity Units?

Single Vanity Plumbing

One basin usually means simpler waste and water connections and easier installation.

Double Vanity Plumbing

Two basin connections create a more complex waste arrangement. Existing plumbing may need modification, and professional installation is often advisable. Not every double vanity requires completely separate systems — the configuration depends on the unit and overall plumbing design.

Single vs Double Vanity: Which Costs More?

What Affects the Price?

Vanity size, material, basin type, worktop, taps, storage configuration, wall-hung or floor-standing design, installation, plumbing modifications and complementary items such as mirrors or lighting all influence cost.

Is a Double Vanity Worth the Extra Cost?

Value depends on use. Frequent simultaneous use can deliver practical benefits. In a one-person bathroom the second basin may add little functional value. In a large family bathroom it can improve convenience. In a small bathroom the extra size may compromise the overall layout.

Wall-Hung vs Floor-Standing Vanity Units

Wall-Hung Vanity Units

These create a floating appearance, make floor cleaning easier and can help the room feel more open. They require suitable wall support and careful installation.

Floor-Standing Vanity Units

They offer a more traditional look, are floor-supported, can provide substantial storage and often fit more easily into certain existing layouts. Houzz’s 2025 UK research found floating vanity units were selected by 53% of renovating homeowners, while freestanding units reached 28%.

How to Choose Between a Single and Double Vanity Unit

Choose a Single Vanity If...

• Your bathroom is compact

• One person normally uses the bathroom

• You have a limited budget

• You want simpler installation

• You prioritise floor space

• One basin provides enough functionality

Choose a Double Vanity If...

• Two people regularly use the bathroom together

• You have sufficient wall space

• You want two separate basins

• You need more countertop space

• Storage is important

• You are renovating a larger bathroom

7 Questions to Ask Before Choosing Your Vanity Unit

1. How many people use the bathroom?

2. How much wall space is available?

3. How much storage do I need?

4. Will two people use the basin simultaneously?

5. Where are the existing plumbing connections?

6. What vanity depth will work with the layout?

7. What is my total budget, including installation?

Single vs Double Vanity Units: Final Verdict

A single vanity is generally the practical choice for compact bathrooms and individual use, while a double vanity can be more convenient for couples and busy family bathrooms where space allows. The right choice depends on the bathroom’s dimensions, layout, number of users, storage requirements and budget.

Explore Royale Stones’ range of bathroom vanity units, including wood vanity units and wall-hung vanity units, to find the perfect fit for your space. Pair your chosen vanity with complementary bathroom tiles, floor & wall tiles, bathroom accessories, mirrors and bathroom furniture for a cohesive finish.

Bathroom Planning Tip: Before choosing between a single and double vanity, measure the available wall width and depth and map the position of the toilet, shower, door and existing plumbing. A larger vanity should improve the bathroom’s functionality rather than restrict movement.

Frequently Asked Questions

Is a double vanity worth it?

It can be if two people regularly use the bathroom at the same time and you have the space. Otherwise a well-designed single unit may deliver better value.

Is a single vanity better for a small bathroom?

Yes, in most cases. Its smaller footprint supports better circulation and layout flexibility.

What is the standard size of a double vanity unit?

There is no universal standard. Common widths range from around 1,200 mm to 1,800 mm, varying by manufacturer and design.

How wide should a double vanity be?

Choose a width that fits your available wall space while allowing comfortable clearance around other fixtures. Measure carefully before buying.

Can two people use a single vanity?

They can, but it is less convenient if both need the basin at the same time. Staggered routines make it more workable.

Does a double vanity need two drains?

Most do require two waste connections, though the exact plumbing arrangement depends on the unit and installation method.

Are double vanity units suitable for small bathrooms?

They can be if the layout is efficient, a suitable slim-depth design is chosen and circulation is not compromised. Careful planning is essential.

Are wall-hung vanity units better than floor-standing units?

Neither is universally better. Wall-hung units can make a room feel larger and simplify cleaning; floor-standing units often offer robust storage and a traditional look. Choice depends on style, structure and preference.