Do I need planning permission

[zaza687]

For a large greenhouse attached to my house ?

Possibly. Lots of variables, like size, height, any permitted development restrictions, previous extensions, Conservation area, construction...

Check gov website. You dont for a conservatory

There are many things to take into account. It is misleading to say you don’t for a conservatory because in certain cases/areas you do. Not all properties have permitted development rights and, even then, there are size restrictions.

ln the first instance, engage with your local planning authority who can provide advice with regard to your specific address.

Depends...