Bathroom types
Twin basin bathrooms: space, waste and real benefit
What decides the layout
Allow roughly 800mm per basin plus clearance; two basins crammed into 1.2m give you two bad basins rather than one good one.
Wastes are best combined into a single branch inside the vanity carcass with accessible connections for future clearing.
A single wide mirror with two lighting points reads calmer than two separate mirrors and is easier to keep clean.
Common mistakes to avoid
Wastes are best combined into a single branch inside the vanity carcass with accessible connections for future clearing.
Connected pages on this site
Your questions answered
Do twin basins need two hot supplies?
They need branches from the same supply; balancing matters so one basin does not starve the other when both run.
Is a large single basin a better choice?
Often, in rooms under about 3m wide. A 1000mm bowl with two tap positions gives most of the benefit and more usable worktop.
Not sure which option suits your property?
Most of these decisions come down to what is behind the wall and under the floor. A site visit settles it quickly.