Where the clarity of glass isn't required, there are plenty of alternatives... lots of ceramics out there and not all glazed finishes require silicon. It might make stuff like enamel impossible to make, but the rules are yours and not mine so I can't be certain there. There are other minerals that can be drawn into fibers suitable for reinforcing things if not conducting light (basalt and carbon spring to mind, though the latter was invented for the production of electric lightbulbs which is much harder in your world).
For basic optical things you can use mirrors. Newton was credited with making the first reflecting telescope, but the possibilities of curved mirrors were understood in the Book of Optics which was written a thousand years ago. Reflecting microscopes have been a thing for nearly a hundred years (there's a potentially relevant article in Science from 1950 which is paywalled because of course it is) but in the absense of glass lenses they might well have been investigated much earlier.
The lack of windows though, that's much more serious. Not only does housing become gloomier and colder, but working hours for many kinds of task become sharply limited in places where there's sometimes a bit too much rain or wind to have open windows and artificial light isn't a suitable replacement for daylight. And speaking of artificial light: no lightbulbs, and use of lamps and lanterns will be sharply constrained by things like wind and drafts and will be somewhat more hazardous. Early transparent plastics were notoriously flammable, and things like LEDs are less than a hundred years old so that's a broad swathe of time with inadequate lighting.
Whilst there are natural transparent minerals like calcite and fluorite they are crystalline rather than glassy, which means mass production is difficult because large crystals have to be grown sloooooowly and cannot be nicely blown and shaped and moulded but must be ground. Fluorite is also soluble, so whilst it is an excellent materials for optical lenses you do have to treat it carefully. Calcite has odd optical doubling effects too, so even if you could grow it quickly and cheaply it is not a drop-in replacement for glass. Neither is conveniently inert like glass.
Transparent ceramics are much better, but they're awkward things to work with which is why they didn't pop up in the real world until the 60s when GE made some lights with clear alumina instead of glass. Some things like synthetic spinel have only very recently been successfully turned into products.
Acrylic resins and polycarbonates and other clear polymers might get you there eventually (alongside things like LEDs which started appearing at the turn of the last century), being a little older than transparent ceramics and much easier to work with, but they're still modern materials that are the end product of a mature industrial civilization build on hundreds of years of scientific advancement, all of which would be slowed by the absense of inert clear materials. There's nothing to say that they couldn't be discovered in boring-silicon-world, but it'll be much harder.