Two rooms can each be right and still be wrong together. Set a colour for each space and the plan marks every junction: which are continuous, which are deliberate, and which look like a mistake.
Kitchen, dining and living share one space. Colour has to do the work walls used to do.
A schematic plan, not to scale. Markers sit on the wall two spaces share. A tick marks a junction that reads as deliberate, and an exclamation mark one that needs attention. A solid ring is fully open plan.
2 junctions need attention, starting with stairs and landing to main bedroom.
Your hall is acting as a neutral buffer. The hall stays quiet, which lets each room off it be different without clashing with its neighbours.
Front entrance to Hall
Doorway
Soft warm white meets Soft warm white.
Continuous. The same colour runs through, so the walls stop acting as a boundary.
Hall to Living room
Wide opening
Soft warm white meets Warm stone neutral.
Controlled step. A visible but related change, which reads as a deliberate shift from one room to the next. The continuous floor carries the eye across, which gives you more freedom here.
Living room to Dining
Open plan
Warm stone neutral meets Deep green.
Deliberate contrast. A strong change with no wall to stop it. It needs a physical reason to happen where it does: a beam, a nib, a change in ceiling height, or a run of joinery. The continuous floor carries the eye across, which gives you more freedom here.
Dining to Kitchen
Open plan
Deep green meets Soft warm white.
Deliberate contrast. A strong change with no wall to stop it. It needs a physical reason to happen where it does: a beam, a nib, a change in ceiling height, or a run of joinery. The continuous floor carries the eye across, which gives you more freedom here.
Kitchen to Utility
Doorway
Soft warm white meets Muted sage.
Controlled step. A visible but related change, which reads as a deliberate shift from one room to the next. The continuous floor carries the eye across, which gives you more freedom here.
Hall to Stairs and landing
Stair
Soft warm white meets Soft warm white.
Continuous. The same colour runs through, so the walls stop acting as a boundary.
Stairs and landing to Main bedroom
Doorway
Soft warm white meets Dusty blue.
Temperature jump (needs attention). Both are near-neutrals but they lean opposite ways, so each makes the other look wrong: the cooler looks bluer and the warmer looks dirtier. Bring them to the same side.
Stairs and landing to Home office
Doorway
Soft warm white meets Mid greige.
Controlled step. A visible but related change, which reads as a deliberate shift from one room to the next. The continuous floor carries the eye across, which gives you more freedom here.
Stairs and landing to Bathroom
Doorway
Soft warm white meets Clean neutral white.
Near-miss (needs attention). The two are close enough to look like a failed match, especially through the door frame. Make them the same, or move one further away.
A hall is the one space that sees nearly every other, so its role matters more than its colour. There are three good answers, and you should pick one on purpose.
A floor that runs through several rooms links them more strongly than any wall colour, so walls can vary more than they could otherwise. It also takes away a choice: the same boards have to work with every wall colour they touch.
Where floors change at a threshold, the threshold is a junction too, and it needs the same check as the walls. Keep any change at a door rather than mid-room, so that the edge has a reason to be there.