Contractors are paid on a per job basis , if to make a reasonable income per day they need to complete ( for example ) 4 jobs ( approx 2 hours per job ) then they are not likely to volunteer to spend 4 hours on your job, if it means that they will only get 3 jobs completed and only paid for 3 instead of 4.
There are limits on what they are required to do on a standard install, so it seems to me reasonable enough , if the pole that serves your address is at the front of the property for the cable from that pole to attach at the front of the property .
If the external cable could be ran from front to back ( on a detached or semi detached property ) then an installer may consider running that ‘extra’ 15 or 20m of cable on the external walls , but if the property is mid terrace ( for example ) then that isn’t really an option.
Once the external cable is terminated on a CSP and an ‘internal’ optical cable is ran to the location of the ONT , again you shouldn’t expect the tech to run that cable through various rooms inside the property there will be limits ( not least the length of the internal Ezibend optical cable ) ….once the ONT is fitted which needs to be close to a power outlet , if you don’t want the router sited close to that position you can always provide your own ‘connection’ from the ONT to the router using your own Ethernet cable , or CAT wiring you have had installed or power line type connectors.
Single stage provision just means they don’t have to come along in advance of the install date to check the underground duct to the property is serviceable, overhead provision will generally by single stage , underground, generally 2 stage.
