Sofa sizes

Thanks for your responses. It is Marks & Spencer and the assistant in store suggested buying one short enough to go through the door upright but she is not an expert. Legs and cushions come off.
I'm not aware of any independent furniture retailers any more.

It’s a good point to get it checked, we bought two new sofas fairly recently, and for that very reason got one a normal size and one a bit smaller,( the normal size came apart).
It’s not just door width to check, it’s how much room to turn the sofa.
We once bought a large wardrobe and the firm that made them came out the check the stairs ( there was a ‘dog leg’ bend)
He approved it and later the men delivered it....and failed to get it up the stairs, it had to be dismantled in the hall, carried upstairs and re-assembled.DH nearly died laughing.

It’s surprising how sofas can get through doorways especially with cushions and feet removed. As someone else has said too, modern ones come apart, I’d check with the shop x

Some of them come apart so that you can get them in, and then fit them together on site.

If you are buying from an independent furniture retailer they will happily come to the house and do a survey for you.