How narrow is too narrow for a snug??

[GF79]

So we've a (1st world) dilemma. 2 kids and 2 adults in a 4 bed house (3 big beds a boxroom which is also a permanent office for WFH husband) but it feels like we're outgrowing the space.

We LOVE the location, proximity to schools, local friends and neighbours etc and for other reasons would really rather not move if we can help it. The only option we have is a side extension, which could give us a cloakroom/WC, utility, snug and lower ground floor office, which would free up the much needed 4th bedroom and get a lot of stuff out of other rooms. BUT the maximum internal width would be 1.7m. I think this would be fine for the utility and for the cloakroom/WC but would it feel too pokey for a snug? It would have a sloping ceiling and skylight too...Im thinking of a comfy chair/sofa bed (a double would fit it mainly used as a sofa), some plants, possibly a flat screen TV and guitars mounted on the wall. Is this a ridiculous idea?!

If anyone has managed to make a decent room of a similar width I'd love to hear from you/see pics! Or if anyone has seen/done similar and would advise against it, I'd also love to hear from you! We don't want to spend a fortune to feel like we've an extra cupboard (as handy as that would be 😂).

Might need to think carefully about door arrangement or whether you can get it so you enter into the utility from kitchen and then go into the snug on the right (couldn't see a measurement for this so not sure how long it is).

In terms of long term value, lots of people might want a great downstairs office or garden room rather than a slightly odd middle space. What direction does it face?

My friend's builder did something clever with an over garage extension that was narrow to take out some of the double skin of bricks (once it's not outside wall and with structural checks).

It might only be a small difference but it created an alcove for the bed and bedside tables and just enough room to walk round the bottom. Made the room into a dressing half and bed half that looks good rather than a thin awkward space.

Something like that that recesses the TV can change the feel even with very small impact on overall size.