2.2m² — the walk-in wet room
No screen, no hob — the entire room is a wet zone. Requires perimeter waterproofing to 150mm and a linear drain. Feels enormous relative to footprint.
3.0m² — L-shaped classic
Toilet in the corner, wall-hung vanity on the long wall, walk-in shower opposite. Works with a 900×900 shower and a 900mm vanity.
4.0m² — twin vanity brief
Achievable with a 1500mm twin basin vanity on the long wall and shower / WC opposite. Concealed cistern is essential.
The five details that make a small ensuite feel bigger
Wall-hung vanities (visible floor reads as more space), frameless glass showers (uninterrupted sight-lines), recessed niches instead of shelves, large-format tiles with tone-matched grout, and continuous flooring from bedroom into ensuite where the door threshold allows.
Ventilation and lighting in small footprints
Small ensuites without windows require a ducted exhaust fan (minimum 60L/s) vented directly to outside — never into the roof space, which is a common shortcut that causes ceiling mould. Layered lighting matters even more in small rooms: a warm-white downlight over the shower, wall-mounted vanity lighting either side of the mirror, and a dimmable general ceiling light on a separate switch.
What we'd never do in a small ensuite
Framed shower screens (visually cut the room), busy mosaic feature walls (add visual noise where you want calm), bulky freestanding vanities (steal 200mm of floor), and drop-in baths (impossible to clean under, waste ~1m² permanently). Small rooms punish bad decisions.
3.5m² — the galley ensuite
Common in Melbourne 1990s and 2000s homes: a long, narrow room off the bedroom, often 1.4m × 2.5m. Shower at the far end (900 × 900 with a fixed panel, no door), WC mid-room with a concealed cistern, 750mm wall-hung vanity at the entry. The single decision that makes or breaks it is putting the shower at the window end so the sight-line down the room ends in daylight rather than in a screen.
4.5m² — separate shower and bath, honestly assessed
At 4.5m² you can fit a 1500mm back-to-wall bath and a 900mm shower, but only by dropping to a 600mm vanity and a compact WC, and the room will read as full. Our advice to most homeowners with one main bathroom already in the house: use the ensuite for a generous shower and keep the bath in the main bathroom. Where a bath in the ensuite is non-negotiable, an inset bath under the window with the shower over one end is the layout that wastes the least floor.
The dimensions and clearances to design around
Numbers we design to: 900mm minimum clear in front of a WC pan and 450mm from pan centre to any side wall; 600mm clear in front of a vanity; 850mm from the vanity front to any opposite fixture for comfortable passing; shower internal minimum 900 × 900 (1000 × 1000 if two people use it); 2000mm door swing kept clear of the shower entry, or a cavity slider fitted instead. Ignore these and the room technically fits but does not work.
What a small ensuite costs in Melbourne
In 2026, a 2–3m² ensuite rebuilt on the same footprint runs $16,500–$22,000, and a 3.5–4.5m² ensuite with relocated fixtures and a twin vanity runs $24,000–$32,000. Small rooms are not cheap per square metre: the same trades, certificates, waterproofing and screen fabrication apply, spread over less area. What small footprints do save is tile quantity and stone.
Combining an ensuite and main bathroom brief
When both rooms are being renovated together — the most common bathroom-and-ensuite design brief we quote — run one specification across both and vary only scale: same tile family, same tapware finish, same vanity profile, different sizes. It reads as deliberate design rather than two separate renovations, saves 8–12% on combined labour because trades attend once, and keeps resale coherent for a buyer walking through the house.
