If you have to choose, main entrance and key interior doors usually come before windows, unless your windows are in very poor shape. Doors are directly connected to security, privacy and daily use. A solid main door with a good lock makes you feel safer. Broken or hollow doors, on the other hand, make even a nicely decorated house feel flimsy.
Interior doors matter for noise control and comfort. If they don’t close properly, you hear everything and can’t really “escape” into a quiet room. Changing or at least repairing the main door and a couple of bedroom doors often improves daily life more than people expect.
Windows are crucial for insulation, sound and natural light, of course. But if the frames are not rotten and glass is intact, you can sometimes delay a full upgrade by improving seals, adding curtains or blinds, and handling small repairs.
If your windows are leaking water, letting in strong drafts or refusing to open, that’s a different story – they move higher on the list. But in a typical old house with a limited budget, I’d secure and upgrade the doors first, then tackle windows in a planned second phase.