A summerhouse is a small, light building that stands in a garden, separate from the main house, where people sit in warm weather. Think of something bigger and prettier than a tool shed but far simpler than a real house: often wooden, often with large windows or one open side, sometimes with a little veranda. It usually has no heating and no bathroom, and people do not sleep in it — they sit, read, drink tea, watch the garden, escape the sun. It is a British and European idea more than an American one, and it says something about the climate: in a country where good weather is rare, you build a place to sit and enjoy it. Modern British people also use their summerhouses as a quiet office or a place for the children's toys, so the word is stretching a little away from 'summer'. In older books, especially set in grand country houses, a summerhouse can be a more elegant garden pavilion, and it is a classic setting for a private conversation in a novel — away from the house, where nobody hears. In some countries, especially Denmark and Sweden, 'summerhouse' translates a word for a whole holiday cottage by the sea that a family owns and stays in for weeks; if you meet a Scandinavian speaker using it that way, they mean a proper second home, not a garden hut.

花園涼亭、庭園小屋（可坐人的木造小屋，非工具間；北歐語境下也可指整棟避暑度假小屋）