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Buy small, and don't move
The trend the last decade has been to upsize starter homes several times during our lifetimes but times are changing. New technology means less physical stuff to store, at least in theory: gone are clunky TVs and even home offices, while laptops and tablets can access music, books and movies stored on the cloud. So buy a smaller home and live there for life, like your grandparents did. As your principal residence, the capital gains will be tax-free. If you need more room, consider adding a sunroom, finishing your basement or building a modest second floor.