Do colours have to match throughout the house?

[DaisyDreams4]

I have a dark blue feature wall in my living room with 3 light grey walls, and it follows through into a kitchen diner. There are double doors to shut off the room but I rarely use them.
I'm looking for a feature wall colour in the dining room and would really like a deep sage green colour with beige curtains and 3 beige walls. But the only wall I could use would be the same side as the blue one and you can clearly see both walls from each room. To the point it almost looks open plan. Will this look odd? My heart is set on both colour schemes.

Try it. There are no rules.

You could try it, but I think what will annoy you/look odd is not the blue or green walls but the grey and beige. It would be better if you could find a griege or beige or other neutral that would go with the blue and green Paint all the other walls to match, with just the feature walls that are different.
Edited to add that that if you can only see the feature walls - the blue/green - and those colours look well together, it’ll be fine.

I agree with this - keep the neutral walls the same throughout and the blue / green will look fine together. The neutral is the key that holds it all together.

Yes they must match. It is the law.

Your house, your rules, but imo adjacent rooms should at least co-ordinate if not match. If you can see through from one to the other you should have some visual continuity otherwise it will jarr. Like pps suggested perhaps keeping the neutral colour the same, and bringing the feature colours through from one end to the other with accessories so that the two spaces are linked.

I don’t think they need to match, no, but the different neutrals will jar. I also think feature walls in a contrasting colour look dated.

What @IllAdvised said!

But if you're set on different colours for the feature walls @DaisyDreams4 , I'd definitely have the same neutral throughout.

At our last house we had two interconnected rooms (although in our case we removed the dividing doors that a previous owner had added as we needed to let more light through than even glazed doors provided) and, having tried painting them different colours, eventually settled on the same throughout.

I confess we did also have a feature wall in one of the spaces, but it was vintage, discontinued American wallpaper left from a previous project and in my defence we only had sufficient to paper the chimney breast 😉

In our new cottage which is considerably smaller, I'm trying to have some kind of continuity of colour palette running through the rooms, so that each space works well with the adjacent room - so, for example we have a 'dining hall' with stairs to the first floor and from which the kitchen leads off in one direction and the snug (behind a door) in the other. The kitchen and dining hall (open to each other) are colour-drenched in Edward Bulmer Pompadour including the kitchen base cabinets. The kitchen wall cabinets are Edward Bulmer Nicaragua which is also the colour of the walls in the little snug. There are accents of lots of other colours (we like bold, maximalist decoration!) including a paler pink which we're using on the staircase walls as these can be seen from the dining area. There's more in a similar vein elsewhere in the cottage, but I won't bore you!

I have a small house with half the rooms having both, and half South, so the same colour palette wouldn't work across the house. There is a colourful painting I love in the sitting room, and I make sure that all the public areas of the house have colours that echo the painting, so there is something that ties them together.