Terrace roofing polycarbonate or glass?

But that doesn't have to apply to terraced and semi-detached houses, does it, or does it specifically apply to closed construction in your building area?
Usually, a development plan specifies one or two points where exactly that does not happen.

That also applies to terraced houses. I have researched and additionally received this information from the building authority. Even if it were not the case, I depend on the neighbor, since actually even terrace canopies are prohibited according to the purchase contract. The developer has stipulated this in the contract but does not take action against it. Our neighbor (investor) is on the board of the developer. If I now do something contrary to the agreement, I could forget about it altogether.

What matters to me now are actually only the advantages and disadvantages of the materials and whether it would be worthwhile to still pursue a discussion regarding polycarbonate. So far, clear glass has been considered.

Every material ages - plastic significantly faster than glass... I would want glass. And yes, you obviously need shading for the terrace orientation - preferably above the glass to provide maximum benefit.

If you choose a pergola awning, it could also extend further than the glass roof and thus provide shade in the evening sun on hot sunny days.

If you have the money, take glass. Plastic always becomes unsightly.

If you have the money, take glass. Plastic always looks unattractive.

Can the additional costs be roughly estimated for 4.8x3m? From neighbors, I know that polycarbonate cost 4,500.

The surcharge from poly to glass is likely negligible. These poly panels have become quite expensive. With both solutions, you won't get around additional shading using an awning and similar systems. Such an [Aufdach-Markise] starts at 3k€.

I never understand why acrylic glass is left out when it comes to canopies... It looks closer to real glass than polycarbonate, lasts longer (yellowing), and is cheaper, lighter, and easier to work with than real glass. I think it’s also cheaper than polycarbonate, but I might be wrong or it depends on the supplier. It is stiffer than polycarbonate, so quieter and requires fewer cross battens. It is more scratch-resistant and scratches can be polished out again. It is naturally UV-resistant, whereas polycarbonate needs a coating (and when that wears off, you can wait a summer and have a lot of material for the [yellow sack]). The only downside is the impact resistance, which is lower, but if it is thick enough, in my opinion, it is negligible and it is still many times more impact-resistant than real glass. (Poly-C: 30 : acrylic glass 25 : real glass 1). So if you can’t afford real glass or are afraid of the weight, I would always choose acrylic glass.