[Closed] How much should I expect to pay to replace my porch

The porch on the front of my house is single glazed and starting to fall apart so I am going to replace it. What would be a realistic price to pay for this to be replaced in UPVC.
The porch consists of
1 normal door
1 double door
3 windows 2.1m x1m (these don't open)

the roof and the base are OK

I would want it fitted as my DIY skills are on the low side