Hi Frankl
Was thinking of doing the same thing but I figure it would mean throwing out the perfectly good windows to make way for steel members to hold up the solid roof. Our house is a bungalow so a pitched roof would have to be tied into the existing roof. Total cost could amount to €20,000 for 120 sq feet area.
what do you do, spend the capital sum and hope to make savings on heating or pump in the heating and eliminate further capital costs or... do not heat or use the room in winter as is our current practice.
To be fair the room heats easily and is quite cosy when the rad is on. But when is goes off the room cools within 15 minutes. We do use it on occasions and it can be very pleasant on sunny days in mid winter, even with no heat. Problem is when you want to make the sunroom 'open plan' with, say, your kitchen. Can't not use the kitchen too!!!
I am going to remove the window between the kitchen and sunroom and hope for the best. If that fails will be forced to spend the money.