Small Bathroom Remodel Guide: Layout, Fixtures and a Budget That Holds

A small bathroom remodel works when the layout is fixed before the fixtures are bought: keep the toilet, sink and shower in their existing positions unless you are prepared to pay $2,000 to $5,000 to move plumbing, choose a 24 to 36 in (61 to 91 cm) vanity and a 32 in (81 cm) shower, and spend the money on light, ventilation and storage rather than on square footage you cannot buy. Price the tile with the Tile Calculator, measure the room with the Square Footage Calculator, compare full remodel costs in the bathroom remodel cost guide, and steal storage ideas from the small bathroom storage ideas guide before you order a single fixture.

Layout: the clearances that make a small bathroom work

A small bathroom works when every fixture has its code clearance, because a bathroom that is 2 in too tight on the toilet is a bathroom that is uncomfortable every single day. The toilet needs 15 in (38 cm) of clear space from its centerline to any wall or fixture on each side, and 21 in (53 cm) of clear space in front of the bowl — 30 in (76 cm) is comfortable. The sink needs 20 in (51 cm) from its centerline to a side wall, and the shower needs a minimum of 30 in by 30 in (76 cm by 76 cm), with 32 in by 32 in (81 cm by 81 cm) the practical minimum that does not feel like a phone booth. A typical small bathroom is 5 ft by 8 ft (1.5 m by 2.4 m), or 40 sq ft (3.7 sq m), and that footprint holds a toilet, a 30 in vanity and a 32 in shower or a 60 in tub if the layout is efficient — but it does not hold all four plus a linen closet, a double vanity and a separate tub and shower, and pretending it does is how remodels fail.

Keep the plumbing where it is. Moving a toilet 3 ft (91 cm) across the room costs $2,000 to $5,000 because the drain has to be re-routed under the floor, the vent stack has to move, and the floor has to be opened and re-poured or re-framed; moving a shower drain is worse, because the shower drain needs a 2 in (5 cm) pipe with a 1/4 in per ft (2 cm per m) slope, and there is often not enough depth under the floor to get that slope to the new location. Swapping fixtures in place — a new toilet for an old toilet, a new vanity for an old vanity — costs the fixture plus $200 to $500 of labor per fixture, and it is the single biggest budget saver in a small remodel. If the layout genuinely does not work, the one move worth paying for is swapping the toilet and the vanity, because both use 1-1/2 in and 3 in drains that are easier to re-route than a shower drain, and the swap can transform a bathroom where the door hits the toilet into one where it does not. Test any new layout with tape on the floor and a cardboard box the size of the vanity, and open and close the door, sit on the toilet, and stand at the sink — the tape test costs nothing and reveals the collisions a floor plan hides.

Choose the door carefully, because a swinging door eats 7 to 9 sq ft (0.65 to 0.84 sq m) of a 40 sq ft bathroom. A pocket door that slides into the wall costs $500 to $1,000 installed and frees that whole swing area, but it needs a wall with no plumbing or wiring in it and it cannot carry a towel bar or a mirror on the pocket side. A barn door on the outside of the wall is cheaper ($300 to $700) and needs no wall cavity, but it does not seal for sound or smell and it needs 36 in (91 cm) of clear wall beside the opening. An out-swinging door is the cheapest fix — just re-hang the existing door to swing into the hallway — but it can block a hallway, and code in some jurisdictions requires a bathroom door to swing out if the room is small enough that a person could fall against it and block it. Whatever door you pick, decide it before the tile goes down, because a door change after tiling means patching tile and trim.

Fixtures: the right size for a small room

Pick fixtures sized for the room, not for the showroom. A 24 in (61 cm) vanity suits a 5 ft wide bathroom and leaves room to move; a 30 in (76 cm) vanity is the sweet spot for most small bathrooms, holding a single sink with usable counter space on each side; a 36 in (91 cm) vanity fits only if the room is at least 5 ft 6 in (1.68 m) wide and the toilet clearance still works. A wall-hung vanity costs $200 to $500 more than a floor-standing one but makes a small bathroom feel larger because the floor runs underneath it, and it makes cleaning the floor a two-minute job instead of a contortion act. Choose a vanity with drawers rather than doors: a drawer holds 30 percent more usable volume than a cabinet with a door, because nothing hides at the back, and a deep bottom drawer holds hair dryers, cleaning supplies and spare toilet paper that would otherwise live on the counter. Budget $300 to $1,200 for a decent vanity with a top, $1,200 to $3,000 for a semi-custom piece, and $100 to $300 for the faucet — and buy the faucet to match the vanity's hole spacing (4 in centerset or 8 in widespread), because a faucet that does not fit the top is a return and a delay.

Choose the toilet for its footprint and its flush, not its looks. A round-front toilet is 2 in (5 cm) shorter than an elongated toilet and is the right choice for a bathroom where the toilet faces a wall or a door, while an elongated toilet is more comfortable and is the right choice where the clearance in front allows it — a compact elongated model splits the difference, giving the elongated seat in a round-front footprint, and costs $250 to $600. Look for a WaterSense toilet that uses 1.28 gallons per flush (4.8 L) instead of the old 1.6 gallons, which saves 4,000 gallons (15,000 L) a year for a family of four and is now the standard in most US states. A one-piece toilet ($400 to $1,000) is easier to clean than a two-piece ($200 to $500) because there is no seam between the tank and the bowl, and a skirted trapway — a smooth base with no exposed pipe — makes the floor around the toilet cleanable with a single wipe. Avoid a toilet with a 10 in (25 cm) rough-in unless your bathroom actually has a 10 in rough-in: most US bathrooms are 12 in (30 cm), and a toilet bought for the wrong rough-in does not fit, full stop.

Choose the shower or tub for the room you have. A 32 in by 32 in (81 cm by 81 cm) shower stall is the minimum that works; a 36 in by 36 in (91 cm by 91 cm) shower is noticeably more comfortable and is worth the extra 4 in if the room allows it. A frameless glass door ($800 to $2,000 installed) makes a small bathroom feel twice as large because the eye runs straight through to the tile, while a shower curtain ($30 to $100) is the budget answer and has the advantage of being replaceable in five minutes. A 60 in (152 cm) tub-shower combination is the right choice for a family bathroom, because kids need a tub and a shower-only stall does not bathe a toddler; a soaking tub in a 40 sq ft bathroom is a luxury that eats the floor space a vanity and storage need. For the shower valve, buy a pressure-balancing or thermostatic valve ($150 to $400) rather than the cheapest two-knob valve: it holds the temperature steady when a toilet flushes, which is a safety feature in a house with kids, not a luxury. And budget the shower properly: a tiled shower with a waterproof membrane (Schluter Kerdi or equivalent) costs $3,000 to $8,000 installed, while a fiberglass shower surround costs $1,000 to $3,000 and is the right choice for a rental or a tight budget, because a leaking tiled shower costs $5,000 to $10,000 to rebuild.

Light, ventilation and storage: the three things that make it feel big

Light is the cheapest way to make a small bathroom feel bigger, because a bright bathroom reads as a large bathroom and a dim one reads as a closet. Put a light over the mirror and a light on the ceiling, not just one or the other: sconces or a light bar at eye level beside or above the mirror ($100 to $400) eliminate the shadows under the chin that a single ceiling light creates, and a ceiling light with a 3000K color temperature at 800 lumens or more lights the room evenly. A window is worth more than any fixture — if the bathroom has a window, keep it, frost it for privacy rather than blocking it, and put the mirror opposite it so the light bounces. If there is no window, a solar tube ($500 to $1,000 installed) brings real daylight into an interior bathroom and changes the room more than any tile choice. Use large-format tile (12 in by 24 in, or 30 cm by 61 cm) on the floor and the shower walls: fewer grout lines mean a cleaner look and less grout to clean, and a light-colored tile with a matching grout color makes the floor read as one surface rather than a grid. Run the floor tile into the shower with no curb or a low curb, because a curbless shower makes the bathroom read as one continuous space.

Ventilation is not optional, because a small bathroom with a weak fan grows mold on the ceiling within a year. Size the exhaust fan at 1 CFM per sq ft (about 0.47 L/s per sq m) — a 40 sq ft bathroom needs a 40 CFM fan, and a 50 sq ft bathroom needs 50 CFM — and buy a fan rated 10 CFM above the minimum, because the rated CFM is measured in a lab and the installed CFM is always lower. Choose a quiet fan (under 1.0 sones, ideally 0.5 sones) for $80 to $200, because a loud fan gets switched off, and a fan that is switched off does not ventilate. Put the fan on a timer switch ($30 to $60) set to run 20 minutes after the shower, because the moisture that causes mold is the moisture left in the air after the shower ends, not during it. Vent the fan outside through the roof or a gable wall, never into the attic — a fan vented into the attic pumps warm moist air into cold roof framing, which grows mold in the attic and rots the sheathing, and it is a defect a home inspector will flag.

Storage is the difference between a bathroom that works and a bathroom where everything lives on the counter. A recessed medicine cabinet ($150 to $500 installed) holds the daily items without taking a single inch of floor space, and a 16 in (41 cm) deep recessed cabinet holds full-size bottles that a surface-mount cabinet cannot. Add a tall narrow linen tower (12 in by 72 in, or 30 cm by 183 cm) in the one dead corner, a niche in the shower wall (12 in by 24 in, or 30 cm by 61 cm, $200 to $400 to build during tiling) for shampoo and soap, and hooks on the back of the door for towels and robes, because hooks hold more in less space than towel bars and are the storage item people actually use. Keep the counter clear with a rule: nothing lives on the counter except the soap dispenser and the toothbrush holder, and everything else has a drawer, a cabinet or a hook. A bathroom that follows that rule feels twice as large as one with the same footprint and a cluttered counter.

Costs, timeline and the budget that holds

Budget $8,000 to $20,000 for a full small bathroom remodel, which works out to $200 to $500 per sq ft ($2,150 to $5,380 per sq m) for a 40 sq ft room — small rooms cost more per sq ft than large ones, because the fixtures, the plumbing and the tile labor do not shrink with the room. The money splits roughly like this: fixtures and vanity 25 to 30 percent, tile and flooring 15 to 20 percent, shower and waterproofing 20 to 25 percent, plumbing and electrical 15 to 20 percent, and paint, trim and accessories the rest. The two items that blow budgets are moving plumbing ($2,000 to $5,000 per fixture moved) and water damage found behind the old shower ($1,000 to $5,000 to repair, because a leaking shower rots the subfloor and the framing behind it). Hold a 15 to 20 percent contingency, because a bathroom remodel is the one project where hidden damage is the rule rather than the exception — the old shower leaked, the subfloor is soft, the vent stack is corroded — and the contingency is what keeps a surprise from becoming a half-finished bathroom with no working toilet.

Expect 3 to 5 weeks for a professional remodel: 2 to 3 days for demolition, 1 week for rough plumbing, electrical and framing, 1 week for tile and waterproofing, and 1 week for fixtures, vanity, paint and trim. A DIY remodel takes 6 to 12 weekends, and the honest DIY line is this: a capable homeowner can do demolition, painting, vanity installation and accessories, but the shower waterproofing, the plumbing rough-in and any electrical panel work should go to licensed trades, because a failed shower membrane is a $5,000 to $10,000 rebuild and a plumbing mistake behind a tiled wall is a wall that has to be opened. Sequence matters: never tile before the plumbing rough-in is inspected, never set the toilet before the floor is finished, and never install the vanity before the walls are painted. Plan for the household to be without that bathroom for the whole job — a second bathroom, a gym membership with showers, or a sympathetic neighbor is part of the project plan, not an afterthought.

Mistakes and the final checklist

Avoid the mistakes that ruin small bathroom remodels: moving plumbing without a budget for it, buying fixtures before measuring the clearances, tiling a shower without a proper waterproof membrane, venting the exhaust fan into the attic, choosing a dark tile with a contrasting grout that chops the room into a grid, and installing a vanity with doors instead of drawers. Add two more: no GFCI outlet within 36 in (91 cm) of the sink, which is a code requirement and a safety item, and no blocking in the shower wall for a future grab bar, which costs nothing to add during framing and $500 to add later. Grab-bar blocking is worth doing in every bathroom remodel, because it is a $0 item during construction and a $500 item after, and because a bathroom is the room where falls happen most.

Run this final checklist before you call the bathroom done: the toilet flushes and does not rock, the shower drains without pooling, the fan runs quietly and vents outside, every outlet is GFCI-protected, the mirror light is at eye level and shadow-free, the vanity drawers open without hitting the toilet or the door, the shower niche holds the bottles you actually use, and the floor is dry 20 minutes after a shower with the fan on its timer. Then use the bathroom for a week before you buy the accessories, because the first week reveals the missing hook, the towel bar in the wrong place and the shelf that should have been a drawer — and a hook is cheaper than a remodel. A small bathroom done this way does not feel small: it feels finished, which is the whole point.