Loft Conversions & House Extensions in Liverpool, Merseyside & Cheshire We are highly experienced, building contractors that specialise in loft conversions Liverpool. We are a fully insured, reliable and friendly building and construction company based in Liverpool We also cover the surrounding areas such as; Widnes, Warrington, St Helens and Wirral. At Mersey Developments, we pride ourselves in providing a quality building service using fully qualified & registered tradesman. At Mersey Developments always use local builders who can work on your loft extensions, loft conversion, loft renovations or even new builds.