An archaeological trial trench evaluation was undertaken on land to the rear of 97 Norfolk St., Kings Lynn, Norfolk. The project was commissioned by Walker Construction Limited to provide information in support a planning application to West Norfolk and King's Lynn Borough Council for residential development at the site. The site lies an archaeologically sensitive area, within the historic core of King's Lynn. Two evaluation trenches were excavated within the footprint of the proposed new building. The evaluation showed that the area of development was marshy ground and probably prone to flooding prior to the 18th century. At this time some it would seem that the ground was reclaimed by dumping of soils and waste materials into the marshy ground. Cartographic evidence indicates the presence of a former fleet in the location of the evaluation trenches. Silts and clays recorded within the trenches may well be associated with this fleet.