A small bathroom is one that is less than 4-5 m² where every centimeter counts. Gaining space does not always mean renovation: it is achieved with compact or wall-mounted sanitary ware, furniture that clears the floor, replacing the bathtub with a shower, and light, mirror, and color tricks that expand the visual sensation without moving a single partition.
Having few square meters does not condemn you to an uncomfortable bathroom. The difference between an overwhelming washroom and one that works is in the decisions, not the surface area: which toilet you choose, whether the vanity is floor-standing or wall-mounted, where the light goes, and how you distribute storage. In this guide, we have gathered 15 practical ideas to truly make the most of a small bathroom, with solutions you can apply in a complete renovation or a weekend update. All cited products are taken from actual product pages in the Merkimarket bathroom catalog.
Key data for a small bathroom
- Reference surface area: a bathroom is considered small if it is less than 4-5 m²; guest toilets are under 2 m².
- Minimum comfortable clearance: leave at least 60 cm free in front of each sanitary fixture to use it with ease.
- Compact toilet: reduced-depth models usually have an outlet of around 36-48 cm, compared to the 60-70 cm of a standard toilet.
- Wall-mounting clears the floor: wall-mounted furniture and toilets leave the floor visible and enlarge the sense of space.
- Shower vs. bathtub: replacing the bathtub with a shower tray frees up to one useful square meter.
- Light and mirror: a large mirror and good lighting are the cheapest trick to visually double the room size.
With these figures in mind, every choice becomes easier. Let's take it step by step.
Why a small bathroom looks smaller than it is
Before buying anything, it is worth understanding what visually shrinks a bathroom. The first enemy is occupied floor space: the more flooring that is visible, the larger the room appears, which is why everything resting on the floor (furniture with legs, pedestal sinks, laundry baskets) reduces spaciousness. The second is fragmentation: many small elements, different colors, and marked grout lines break up the view and make it smaller. The third is the lack of light, which sinks the corners and erases depth.
The good news is that these three factors can be corrected with concrete decisions: clearing the floor, unifying and organizing, and adding light. The ideas that follow address those three fronts.
Sanitary ware: compact and, if you can, wall-mounted
The toilet is the piece that most conditions a small bathroom because it requires clearance space in front. The solution is a compact toilet with reduced depth: models like the 36.5 cm compact Roca The Gap Square cut several centimeters compared to a traditional toilet without sacrificing the dual flush or rimless technology, which also facilitates cleaning by eliminating the inner rim.
If you are going to carry out a renovation, consider the wall-mounted toilet: by hanging from a built-in frame, it leaves the floor clear under the bowl, which enlarges the sense of space and makes mopping easier. You have the full comparison in our guide on wall-mounted vs. floor-mounted toilets. When renovation is not an option, a compact, dual-outlet, close-coupled toilet like the The Gap Round compact is the simplest alternative.
Furniture and storage: take everything to the wall
Poorly resolved storage is what most clutters a small bathroom. The golden rule is to take furniture off the floor: a wall-mounted vanity, such as the Flat 63 cm white wall-mounted vanity, leaves the floor visible and creates a lower gap perfect for a stool or a basket. In tight widths, 60-63 cm is usually the size that best balances storage and passage.
From there, take advantage of height: a narrow tall cabinet, shelves over the toilet, or a mirror with an integrated cabinet multiply capacity without stealing meters. Choose smooth doors and fronts, without protruding handles, so the view runs without obstacles. If you want to refine measurements and materials, we have a guide dedicated to bathroom furniture: measurements, materials, and storage, and the entire selection in our bathroom furniture collection.
Change the bathtub for a shower: the biggest space gain
If you still have a bathtub and the bathroom feels small, this is the change with the greatest impact. Replacing the bathtub with a floor-level shower tray frees up to one useful square meter and eliminates the low wall that fragments the view. A flush tray with a transparent screen makes the floor and tiling continue without breaks, and that visual continuity is what most enlarges a small bathroom. We explain the price, timelines, and process in our guide on changing a bathtub for a shower tray.
Choose a sliding or inward-folding screen to avoid invading the passage when opening, and prioritize transparent glass over frosted: the more you can see through the screen, the larger the room looks.
Light, mirror, and color: the visual trick that costs no renovation
The three cheap allies of a small bathroom are light, mirrors, and color. A large mirror, if possible the width of the vanity or wider, visually doubles the depth; if it has integrated LED light, it adds illumination without taking up ceiling space. As for color, light tones and a unified range (the same white or gray on walls, vanity, and sanitary ware) prevent fragmentation and widen the space. Reserve dark colors or matte black finishes for small faucet details, not for large surfaces.
Regarding light: combine a general source on the ceiling with light on both sides of the mirror to eliminate shadows. A neutral color temperature (around 4000 K) is the most flattering and realistic for a bathroom.
15 ideas to gain space in a small bathroom
- Install a compact toilet with reduced depth to reclaim passage space.
- If you are renovating, opt for a wall-mounted toilet and vanity: a clear floor enlarges the space.
- Change the bathtub for a floor-level shower tray.
- Choose a transparent glass screen, sliding or inward-folding.
- Place a large mirror, the width of the vanity or larger.
- Add light to both sides of the mirror plus a general one on the ceiling.
- Unify the color palette in light tones to avoid visual cuts.
- Take advantage of height with narrow tall cabinets and shelves over the toilet.
- Use a compact or semi-recessed sink if the width is very tight.
- Prioritize smooth fronts and integrated handles that do not protrude.
- Replace the swinging door with a sliding one if the swing steals space.
- Choose slim deck-mounted or wall-mounted faucets to clear the countertop.
- Add vertical storage in the shower with a niche or corner shelves.
- Keep the floor as clear as possible: fewer objects on the floor, more spaciousness.
- Repeat the same flooring inside and outside the shower to extend the view.
Comparison: which element frees up the most space
Not all interventions yield the same results. This table summarizes the effort and space recovered from the main solutions for a small bathroom:
| Solution | Space gained | Requires renovation? | Ideal for |
|---|---|---|---|
| Bathtub → shower tray | Very high (up to 1 m²) | Yes | Bathrooms with old bathtubs |
| Wall-mounted toilet | High (visual + floor) | Yes (frame) | Complete renovation |
| Compact toilet | Medium (reduced depth) | No | Update without renovation |
| Wall-mounted vanity | Medium (clears floor) | No | Almost any bathroom |
| Large mirror + LED | Visual | No | Expand without touching anything |
| Sliding door | Medium (eliminates swing) | Yes | Bathrooms with swinging doors |
5-step action plan
- Measure and sketch. Note the width of the room and mark where the door, window, and plumbing pipes fall: they condition everything else.
- Decide on the big change. If there is a bathtub, consider a shower; it is what returns the most space.
- Choose the sanitary ware. Compact or wall-mounted toilet and a sink adjusted to the available width.
- Solve the storage. Wall-mounted vanity plus vertical storage; nothing on the floor that you can hang.
- Finish with light and mirror. The final touch that multiplies the feeling of spaciousness at almost no cost.
Frequently asked questions about small bathrooms
How many square meters is a small bathroom?
A bathroom is usually considered small if it is less than 4-5 m². Below 2 m² we are talking about guest toilets, where it is advisable to prioritize compact toilets and sinks and do without the bathtub.
Is a shower tray or a bathtub better in a small bathroom?
In most small bathrooms, the shower tray wins: it takes up less space, frees up to a square meter, and, with a transparent screen, enlarges the view. The bathtub only pays off if its use is essential for you.
What colors enlarge a small bathroom?
Light tones and a unified palette (the same white or gray on walls, vanity, and sanitary ware) reduce visual cuts and widen the space. Leave dark colors or matte black for faucet details.
Is a wall-mounted toilet worth it in a small space?
Yes, if you are going to carry out a renovation: by leaving the floor clear, it enlarges the space visually and facilitates cleaning. If you don't want to touch the plumbing, a compact toilet with reduced depth achieves much of the effect without renovation.
Article written by the Merkimarket editorial team. The measurements and characteristics of the cited products are taken from the Merkimarket catalog pages; prices and availability may vary, consult each product page for current information in Spain.
