When we renovated our 80s house, we had window screens and screen doors custom made. We used a local company, ISP-Zürichsee:
https://isp-zuerisee.ch
The screens are well made, installation quick and efficient - but that came at quite a price, especially for a curved window. Think thousands.
Because of the price, we chose not to do some of the balcony doors.
We regularly need to repair the screen door leading to the garden, as screen can't stand up to over-eager mutts. OH DIYs the repairs using screening roll from B/H or Hornbach I can't remember which one.
Bugs seem to be getting worse, and temps warmer, so doors are open more often, so we need to add screens to the balcony doors - and this time around OH will DIY those too.
You can buy kits at B/H to make screens for doors and windows. An example of a screen door kit is here:
https://www.hornbach.ch/shop/Insekte...2/artikel.html
Another brand is Tesa, which has many different products. Their telescoping frames for doors and windows are perhaps easier for those who are not DIY aficionados, but a bit more expensive. Here:
https://www.bauundhobby.ch/gartenein...16cm/p/6736664
And this bit to mount:
https://www.bauundhobby.ch/gartenein...eiss/p/6736671
So for either CHF 54 or CHF 169, the DIY versions are much less expensive than the 1K per door I paid for custom made back in 2004.
I should note that I have heard that prices for custom made have come way down since we installed ours 15+ years ago. Back then screens were not something people standardly wanted, and so premium prices were charged. Now that they are increasingly expected, you should not write off custom made without looking into current prices, you might be pleasantly surprised.