On our estate you need planning permission for change of use and conservatories. We extended our kitchen into the garage and needed planning permission, which we go.
Two of our neighbours have built conservatories without permission. One of them is having a massive thing built stretching the whole width of the house. You can look online and they haven't got the necessary permission. I know generally you can have a conservatory built but there's a clause for these on our houses.
WWYD?