seems you know what  the guys are charging already - are you going to be better than them?,offering an extra? ,IF so ,then charge more 
 it is tuff out there at the moment,  a lot of my customers are council and its challenging work, but if you offer a no- nonsense service and have a bit of charm ,you should be allrite .
 i see a window guy  sometimes ,who has a big clipboard he uses after each finishing each job, and big invoices - in my opinion  that wont work  for the average council house type ,  they want a laff   .