However if you are completing any further renovations to create a physical balcony or terrace you must contact your local authority to gain planning permission.
Roof balcony planning permission.
The dormer may well be permitted development but accessing the roof to use as a balcony is not.
The juliet balcony has a floor no matter how slim it will be considered a raised platform and will need planning approval.
In uk the answer would mostly be yes because raised platforms are not permitted developments.
People who would like a balcony also wonder if it will need planning permission.
This is especially the case in conservation areas or where there is no precedent.
The doors at the rear should have a juliet guarding to prevent use of the roof unless planning permission is given for use of the roof as a balcony which should then have 1 1m high guarding.
Architexeter 12 dec 2013 2.
The property is listed or within a conservation zone you will almost certainly require planning permission.