The traditional range of residential properties in Canada is wide, with detached, semi-detached and terraced houses, flats, studios and bedsits, bungalows and maisonettes. There are a number of alternative options which can make attractive investments. Static trailers or caravans are increasingly popular, while canal houseboats can be let as long term dwellings as well as holiday hires. Many properties can also be converted into residential homes, for example farm buildings such as barns. Disused windmills and oast houses, a structure common in Kent, make unique homes, while there is a growing interest in ecologically friendly builds.