I almost had the same problem but... I have like 0.5 cm space left to get the playpen trough the door..
You can still do it though, a playpen should be semi easy to move around, is there something all the way down at the bottom middle to make it smaller for transportation?

I myself am thinking to buy another bed in the future now though... I realsed It will be extremely inconvinient to move the playpen up and down in the house every single time ..
If you have the money I think you should go for comfort.. imagine you carry the baby to the different room and the bed is not there yet.. you need to put him down in a semi dangerous possition (like a sofa) than move the bed again.. and pick up the baby again and put him in the bed.. i'm afraid if I do this my baby will wake up ..