Single vs Double Bathroom Vanity Units – Which Should You Choose

Key takeaways

• Single vanities are usually the best choice for cloakrooms and compact bathrooms, while doubles work best in larger family or en‑suite spaces where two people regularly get ready at the same time.
• Allow at least around 1200 mm of clear wall width for a comfortable single unit, and 1500–1800 mm or more for most double units, plus door swing and circulation space.
• Double vanities cost more to buy and install, and can involve more complex plumbing, but can feel like a luxury upgrade and may appeal strongly to future buyers in larger homes.
• If your room is tight, a compact floor‑standing vanity such as a 600 mm unit with integrated basin can deliver practical storage without overpowering the space; one example is this 600 mm floor‑standing vanity with basin.
• You do not have to commit to double sinks to gain more function; you can start with a single vanity now and plan an upgrade path using better storage, wider worktops or a future plumbing change.

Single vs double bathroom vanity units at a glance

Before diving into measurements and plumbing, it helps to understand what each option really offers.

A single bathroom vanity unit combines one basin with storage underneath, either floor‑standing or wall hung. Widths typically run from very compact 400–500 mm cloakroom units up to 900–1200 mm models with generous worktop space. They are more flexible to position, easier to install, and usually more budget‑friendly.

A double bathroom vanity unit pairs two basins side by side on one continuous unit or worktop. Common widths start around 1200–1400 mm but 1500–1800 mm gives more comfortable spacing. Doubles shine in main bathrooms and large en‑suites used by couples or families, where two people often need to wash, brush teeth or do hair at the same time.

The choice is rarely about style alone. The right answer depends on how much wall you have to play with, the depth of the room, how many people actually share the bathroom in practice, and how much you are willing to spend on joinery and plumbing changes.

Room width, depth and layout: do you have enough space?

Space is the first big deciding factor. Even the most practical double vanity will feel wrong if it overwhelms the room or creates awkward pinch points near doors, toilets or showers.

Minimum comfortable width for a single vanity

Compact single vanities start around 400–500 mm wide, aimed at cloakrooms and small bathrooms. A good example size‑wise is a 400 mm floor‑standing unit with integrated basin: something like a compact 400 mm cloakroom vanity that tucks neatly into tight spaces.

For a main bathroom, many people find 600–800 mm a sweet spot: wide enough for a comfortable basin and some worktop, but not so big that it dominates. A 600 mm floor‑standing vanity with basin, for instance, offers a practical balance of footprint and storage. Consider the unit width plus at least 150 mm of clearance each side where possible, so you are not hard up against a wall or shower screen.

As a rough guide, if you have around 1200 mm of almost uninterrupted wall (excluding door swing and radiators), a single vanity will usually feel natural and give you flexibility on exact size and style.

Minimum comfortable width for a double vanity

Double vanities can be tempting, but they do need breathing space. If you try to squeeze one into a narrow wall, you can end up with two basins crammed together and no place for toiletries.

As a rule of thumb:

• Absolute minimum unit width: around 1200 mm for two compact basins, better from 1400 mm upwards
• Comfortable span: 1500–1800 mm with decent worktop space between basins
• Ideal room width: enough for the vanity depth (often 450–500 mm) plus at least 800–900 mm of clear standing space in front

If your wall is under about 1500 mm, a double may be technically possible but visually and practically tight. In that kind of room, a generous single unit with good storage usually works better.

A quick test: stand where the vanity will go and imagine a person using the toilet or walking past behind you. If it already feels cramped, a double vanity is probably not the right fit for that room.

Storage capacity and organisation: one vs two stations

Storage is often why people consider upgrading to a larger or double vanity. But it is not just about volume; it is about how usable that storage feels day to day.

How single vanities handle storage

A single unit can be surprisingly capable if you choose the right layout. Many floor‑standing models offer a combination of cupboard space and internal shelves, or soft‑close doors that hide away cleaning products and spare toiletries. Even at 500–600 mm wide, a well‑designed single unit can swallow everyday essentials.

For example, a 500 mm floor‑standing cloakroom vanity still gives you a full under‑sink compartment, while staying compact enough for tighter rooms. A unit similar in spirit to a 500 mm floor‑standing vanity with basin can work well in smaller bathrooms where a full double is out of the question.

If you frequently share a single vanity, you may need to be more deliberate about organisation: baskets for each person, drawer dividers, and possibly extra wall cabinets. Our guide to bathroom vanity storage solutions, including drawers, shelves and cabinets explains how to maximise what you already have.

What double vanities offer for storage

Double units usually come with a wider run of cupboards and drawers. Some designs even offer one side per person, with matching drawers and mirror cabinets above. This can transform morning routines, because everyone has a clearly defined place for their things.

However, you do not always get twice the storage. The central area between two basins may be partly occupied by extra plumbing, and some double units sacrifice full‑depth cupboards for a streamlined look. Always check internal layouts, not just external width, when you compare options.

If your main frustration is clutter rather than a lack of sinks, a smarter single vanity with a better storage configuration may be more effective than adding a second basin.

Morning routine convenience: who actually uses the bathroom?

Think realistically about how many people use the bathroom at once, and what they do there. A double vanity can feel like a revelation for some households and needless for others.

When a single vanity makes more sense

A single unit is usually the better choice when:

• The bathroom is mainly used by one person at a time.
• You are furnishing a guest bathroom or cloakroom, where visits are short.
• The household routine is naturally staggered (for example, different working patterns).
• You prioritise more floor space or a larger shower/bath over extra basin capacity.

In these cases, a single vanity with a slightly wider top (700–900 mm) can feel far more practical: one generous sink, plenty of surface space, and good storage underneath.

When a double vanity really earns its keep

A double vanity shines in bathrooms where two people often need to use the sink at the same time. Typical scenarios include:

• Couples getting ready together in a shared en‑suite.
• Older children or teenagers sharing a main family bathroom.
• Homes where schedules overlap and queues at the basin are common.

Having two separate basins reduces bottlenecks, and the feeling of having your own dedicated station is a genuine quality‑of‑life improvement. You can also reduce clutter by assigning each person their own drawer or side of the cabinet.

Plumbing, installation and future flexibility

Beyond space and lifestyle, plumbing is the next big practical consideration. Changing pipework can be done, but it adds cost and disruption.

Plumbing implications for single vanities

Installing a single unit usually involves:

• Connecting one basin waste to the existing soil stack.
• Connecting hot and cold feeds to the mixer tap.
• Possibly rerouting pipework slightly to match the new unit height or position.

Because there is only one set of connections, you have more freedom to choose between wall‑hung and freestanding styles without a major re‑plumb. Our comparison of wall hung vs freestanding bathroom vanities explores these options in more detail.

Plumbing implications for double vanities

Double units are more involved. You will have:

• Two basin wastes to connect, which may require additional pipework or a shared trap arrangement.
• Additional hot and cold feeds for the second tap, and possibly access panels to keep everything maintainable.
• More careful planning of where shut‑off valves and isolation points sit.

If your existing bathroom is configured for a single basin, upgrading to a double will almost always mean some new plumbing and potentially changes to the wall behind. This is not necessarily a reason to avoid it, but it is worth planning early and budgeting accordingly. Our guide to bathroom vanity installation basics can help you understand what is involved.

Cost, value and impact on resale

Cost is not just the price of the unit. You also need to weigh installation, plumbing, and whether the choice adds perceived value to your home.

Typical costs and value of single vanities

Single vanities generally cost less to buy and install than double units. You are paying for one basin, one tap, fewer materials and simpler plumbing. Compact freestanding units with integrated basins, like a 600 mm vanity with ceramic sink and storage, are often good value because they bundle everything into one package. For example, a 600 mm freestanding vanity with basin and waste included can provide a neat all‑in‑one solution for many bathrooms.

From a resale perspective, a well‑proportioned single vanity that leaves the room feeling spacious and practical is usually more appealing than an oversized unit that makes movement awkward. Prospective buyers often look for balance: enough storage and surface space without feeling like the room has been compromised.

Typical costs and value of double vanities

Double vanities cost more, but in the right setting they can also feel like a premium upgrade that helps your property stand out. You will typically pay extra for:

• The wider unit or bespoke cabinetry.
• Two basins and two taps.
• Additional plumbing work and installation time.

In higher‑value homes or large master suites, a double vanity can become a selling point, especially in an en‑suite off the main bedroom. However, in a modest‑sized bathroom, forcing in a double unit at the expense of comfortable circulation can have the opposite effect and put some buyers off.

A vanity should feel tailored to the room, not squeezed into it. Buyers notice when the layout feels natural and easy to live with.

Real‑world scenarios: which suits your household?

It can help to think in scenarios rather than abstract pros and cons. Here are a few common situations and how they map to single vs double choices.

Small family bathroom with one main bath

In a compact family bathroom, floor space is precious. Children may share the room, but not necessarily at the same time. In this situation, a sensible single vanity around 500–700 mm wide with good storage is often the best choice. Something like a 500 mm floor‑standing unit with a soft‑close door and integrated basin can provide plenty of space for toiletries without crowding the room.

You can pair the vanity with wall shelves or a mirrored cabinet to create extra storage for each person, preserving much‑needed circulation space in front of the bath or shower.

Large en‑suite used daily by a couple

In a more generous en‑suite off the main bedroom, two people may use the bathroom at the same time every day. If you have enough wall length and clear floor area, a double vanity can transform your routine, especially if you both like to keep your own set of products near the sink.

Here, investing in a double unit makes sense, as long as the remaining layout (toilet, shower, door swing) still feels comfortable. The second basin is less about necessity and more about avoiding queues and giving each person a dedicated area.

Guest bathroom or cloakroom

Guest spaces benefit from being easy to clean and simple to navigate. A single compact vanity is nearly always the better choice here. Even a narrow 400–500 mm unit with an integrated basin can create a smart, self‑contained washing station without wasting space.

Because guests only use the room occasionally, you rarely need the complexity or cost of a double installation. Prioritise a comfortable basin height, a bit of storage for spare toiletries, and a clear, uncluttered feel.

Upgrade paths: from single to double (and vice versa)

You are not locked into one configuration forever. Many people start with a single vanity and later upgrade their bathroom when circumstances change.

Upgrading from single to double

If you like the idea of a double vanity in future, plan ahead even if you choose a single now. You can:

• Position the single vanity so there is enough wall left to extend later.
• Choose a style that is easy to match with extra cabinetry down the line.
• Have your plumber run pipework in a way that would not make future changes difficult, for example, leaving access in the wall behind the vanity.

In the meantime, you can increase functionality by choosing a slightly wider unit with more storage or adding coordinating tall cabinets and mirrored storage above.

Downsizing from double to single

Sometimes people inherit a layout that does not suit how they live. If your bathroom feels dominated by an oversized double vanity that you do not really use, downsizing to a single can free up space for a larger shower, a more generous walkway, or additional storage.

In this situation, a thoughtfully chosen single vanity around 600–800 mm wide, such as a modern floor‑standing unit with a lacquered finish and integrated basin, can make the room feel bigger and more balanced without leaving you short on storage.

So, which should you choose: single or double?

Bringing everything together, your decision comes down to four main questions:

• How wide is the wall where the vanity will go, and how much clear space do you need in front and around it?
• How many people actually use the basin at the same time, and how often does that happen?
• What kind of storage do you really need – more drawers and cupboards, or more basins?
• How much disruption and cost are you comfortable with for plumbing and installation?

If you are limited on space, prioritise movement, comfort and storage: a single vanity will almost always serve you better. If you have a large bathroom or en‑suite and you and your partner truly do get ready together most days, a well‑sized double vanity can feel like a worthwhile indulgence that also appeals to future buyers.

Conclusion

Single and double bathroom vanity units both have a clear place. Singles excel in smaller rooms, guest spaces and family bathrooms where floor area and easy cleaning matter most. With careful measurement and good storage design, a compact 400–600 mm floor‑standing vanity, such as a 400 mm cloakroom‑style unit or a 500 mm freestanding vanity with basin, can offer more practicality than you might expect.

Double vanities come into their own in spacious main bathrooms and en‑suites where two people share the space regularly and you want that boutique‑hotel feeling of having a basin each. Just be sure that the room is wide enough to support the extra unit without compromising comfort or circulation.

By weighing your room size, household routine, storage needs and installation budget, you can choose the configuration that will quietly support your everyday life for many years to come.