I think cheapest is to put the stairs on top of, or next to, the existing stairs. Assuming your roof ridge line runs left to right not front to back, so there is headroom directly above the existing stairs, I would put new stairs there.
That would lose Bedroom 3 but you may be able to add eg walk in wardrobe or possibly shower en suite to bedroom 1 and make good use of the “lost” space.
If you put the stairs next to the current stairs, running the other way, you’d have to reconfigure the walls in the hall inc entry to bedroom 2 I think, and you’d still end up losing a lot of space in bedroom 3.
Source: I work in a office that has nothing to do with building/architecture/etc. but have renovated one single house (only).
I think cheapest is to put the stairs on top of, or next to, the existing stairs. Assuming your roof ridge line runs left to right not front to back, so there is headroom directly above the existing stairs, I would put new stairs there.
That would lose Bedroom 3 but you may be able to add eg walk in wardrobe or possibly shower en suite to bedroom 1 and make good use of the “lost” space.
If you put the stairs next to the current stairs, running the other way, you’d have to reconfigure the walls in the hall inc entry to bedroom 2 I think, and you’d still end up losing a lot of space in bedroom 3.
Source: I work in a office that has nothing to do with building/architecture/etc. but have renovated one single house (only).