Obviously if theres to much hassle bringing a ladder in you simply dont do it.
I have jobs were I use a ladder inside and I tell you now, theres no way you would use a pole inside. Im talking expensive propertys million pound+, mint white walls and cream carpets below gallery windows, you would be taking a high risks cleaning these with such metohds it cannot be done without getting dirty drips down the walls.
I wouldnt even consider using a pole under conditions like that, if I couldnt get my ladder in I wouldnt touch the job, its not worth it.
USE YOUR HEAD NOT YOUR INSURANCE POLICY!!