Over the past few years, many of us have spent extra time at home—and that means we appreciate the personal design touches that make a house cozy and comfortable more than ever. Some of us have adapted our dwellings in new ways, from creating functional home offices to upgrading the appliances we use most.

But while it’s important to make your home your own, it’s also smart to think about the long-term impact your renovations could have on its value. Choosing highly-personalized fixtures and finishes...