summer house 
noun
A small building in a garden, used for sitting in during fine weather.There are three patio areas, a summer house and garden shed....
- Many of the school's sixth formers helped with the work on the summer house and surrounding garden.
- The building with which this appeal is concerned was originally a summer house in the garden of the Trust's property.
Synonyms
gazebo, pavilion, belvedere, arbour, bower, pergola
archaic, Turkey & Iran kiosk
- be of one (or a different) mind
- be of service
- be of the belief that
- be of the opinion that
- Beograd
- be old enough to be someone's father (or mother)
- be on about
- be on a hiding to nothing
- be on at someone
- be one's brother's keeper
- be oneself
- be one's life
- be one's own boss
- be one's (own) lookout
- be one's own man (or woman)
- be one's own master
- be one's own person
- be one's own woman
- be one's own worst enemy
- be on firm ground
- be on nodding terms
- be on one's best behaviour
- be on one's mettle
- be on one's way
- be on (or on to) a loser