5 m² bathroom: is it possible to install a double basin?

What dimensions should you plan for a double basin?

Width: the starting point for your project

A double washbasin unit requires space to function properly on a daily basis. Plan for between 120 and 160 cm in width to comfortably accommodate two basins. The minimum of 120 cm allows two users to get ready in the morning without getting in each other’s way.

Each washbasin area needs at least 60 cm in width to be truly practical. This distribution gives you enough room to put your toiletries and avoid morning jostling. Some manufacturers offer compact versions from 100 cm, but bear in mind that the space between the basins then becomes very tight.

Depth and circulation space

For the depth, plan between 50 and 60 cm. This dimension incorporates the space needed for plumbing while keeping a functional work surface. A depth of 45 to 60 cm offers the right balance between storage and space in the room.

Don’t forget the space in front of your unit: you need a minimum of 70 cm to open the drawers and use the basins comfortably. In total, a standard double basin unit takes up 3.20 m² including its usage zone. That is already more than half of your available surface area!

The specific challenges of 5 m²

In a small bathroom, every centimetre counts. You will need to reduce the depth of your unit to 35–45 cm to maintain a smooth flow of movement. This difference of a few centimetres changes everything: you keep the space needed to move around without feeling cramped.

A surface area of 5 m² is truly the minimum for considering a double basin layout. The shape of your room — rectangular or square — will determine whether your project is feasible or not.

How to lay out your 5 m²: discover the configurations that work

The elongated bathroom: your ally for optimising space

A rectangular 5 m² bathroom offers particularly functional linear layout possibilities. This configuration allows you to organise your equipment along the walls, creating a smooth flow from the entrance. We recommend positioning the basin unit near the entrance, possibly alongside a space for a washing machine. A 120 x 80 cm shower fits behind the door, giving you a comfortable space without obstructing circulation.

Place the compact WC (40 x 60 cm) in the opposite corner to make use of every available nook. This organisation allows you to integrate all your essential equipment while maintaining a smooth flow of movement. Another advantage: this rectangular configuration makes it easier to install the plumbing by grouping the water inlets on the same axis.

The square bathroom: a balanced layout

Your small bathroom lends itself to an equally functional linear layout. Position a compact 80 x 80 cm shower in the left-hand corner at the entrance. The washbasin unit and washing machine are installed on the wall facing the door. The WC finds its place in the right-hand corner behind the front door.

This balanced arrangement guarantees a smooth flow of movement while integrating all your essential equipment. A shelf provides additional storage without reducing your floor space. The square shape requires a different approach to the elongated configuration, but is equally effective.

Position your equipment intelligently

The location of your water inlets and outlets determines the final arrangement of your equipment. Analyse these technical constraints from the very first stages of planning to avoid costly plumbing work. Your goal: to preserve a smooth central circulation area while integrating your essential elements.

Unused corners become your allies for bespoke storage solutions. Place your shower in a corner to free up as much floor space as possible. Position the WC behind the door to optimise space without obstructing the main access. Every square centimetre counts and can become a functional asset.

Choosing the right equipment to optimise your space

Inset or countertop basins: make the right choice

Your type of washbasin directly influences how you use your space and your everyday comfort. The inset basin makes cleaning easier thanks to its flat, continuous surface. You can wipe down the worktop in a single movement, with no rim to trap dirt. This practicality is particularly appreciated in a family bathroom.

The one-piece moulded basin eliminates the joints where residue and moisture typically accumulate. This single-block design guarantees impeccable hygiene with less effort. The countertop basin, despite its attractive aesthetic, causes splashing around its base and makes cleaning more difficult. In a 5 m² space, opt for the inset basin for its practicality.

Shower: open or enclosed?

The walk-in shower (https://www.facq.be/fr/particuliers/nos-inspirations-pour-vos-projets/osez-la-douche-italienne-dans-une-petite-salle-de-bain) creates a feeling of space thanks to its sleek design and step-free access. Its single glass panel brings a sense of openness that is particularly welcome in a small space. However, bear in mind that this open configuration requires more room and may allow water to escape towards the rest of the room.

The enclosed cubicle effectively keeps water within its dedicated area. It adapts perfectly to the constraints of a compact bathroom as it can be installed in a corner or an alcove. For your 5 m², the enclosed cubicle gives you better control over water while preserving every available square centimetre.

Make use of height with wall storage

Wall storage units allow you to gain precious centimetres of floor space by making use of the ceiling height. Recessed shelves and wall-mounted cabinets free up circulation space while providing the storage you need.

Wall-hung WC: the ally of small spaces

The wall-hung WC visually opens up the floor space and makes it much easier to maintain your bathroom. This wall-integrated unit does not touch the floor, making it easy to clean underneath. You can even adjust its height during installation to suit your needs. This solution is perfectly suited to confined spaces where every centimetre counts.

Alternative solutions when a double basin is not possible

An extra-large basin

Short of space for a traditional double basin? The wide basin is an excellent compromise between aesthetics and space saving. This solution maintains the functionality of simultaneous use while reducing the overall footprint of the unit. The large single basin, generally with a minimum width of 100 cm, is an ideal option.

This configuration allows you to maintain the comfort of two-person use without sacrificing the precious square centimetres of your 5 m² bathroom. Maintenance also becomes simpler with just one basin to clean instead of two.

A single basin unit with optimised storage

Opting for a single basin unit frees up space to maximise storage in your small bathroom. A single basin unit allows you to install vertical storage columns or additional wall shelves. This configuration offers greater flexibility for organising your toiletries and towels.

Soft-close drawers and modular compartments compensate for the absence of a second basin by making better use of the available volume. The result: you gain in functionality while preserving the aesthetics of your bathroom.

Prioritising other equipment

In a small bathroom, choosing a spacious shower or keeping a compact bathtub may prove more sensible than installing a double basin. This approach meets your actual needs based on your daily habits.

A family with young children will often prefer to keep a functional bathtub rather than multiplying the water points at the washbasin. Analyse your lifestyle: do you actually use the washbasin simultaneously every morning? This reflection will guide you towards the right layout choice.

Finding the right balance between comfort and space

A double basin in a 5 m² bathroom? It is possible, but it requires careful thought about your actual needs. We recommend honestly evaluating your daily habits before taking the plunge. If two people regularly use the bathroom at the same time, the investment is worthwhile.

However, never sacrifice circulation comfort to install a double basin. A bathroom where you are constantly bumping into things serves no one. Alternatives such as the extra-large basin offer an excellent compromise: you retain the functionality of simultaneous use while preserving space.

The goal remains simple: create a bathroom that truly suits your lifestyle. Sometimes, opting for a spacious shower or additional storage proves more sensible than adding a second basin.