During the early 1990s developers and archaeologists had found that, much though they may have initially resented it, they sometimes needed each other. Increasing demands from planning and other authorities meant that clients were looking for services beyond those of the 'traditional' archaeological skills. Clients whom WA had helped in one sphere were broadening their horizons and, happy with the service provided, encouraging WA to go with them. Historic landscape and building surveys, environmental assessments, coastal surveys and excavations were all new and growing areas of work, often in new parts of the country. Commercial archaeology had to diversify, and so did WA. 
 One of the first major coastal projects was the Langstone Harbour Survey on the Hampshire coast, for which WA joined Portsmouth University, the Hampshire and Wight Trust for Maritime Archaeology (HWTMA) and Southampton University. The survey made use of a wide variety of methods to study the intertidal area, amongst which were the digitisation of map and aerial photographic information, walkover and ‘swim-over' surveys (effectively underwater fieldwalking!), and excavation both on land and underwater. This was the first WA project to make use of divers (even though only one, Kit Watson, was from WA; the majority were from HWTMA).
 Major excavations were also in progress at two sites to the west of London, one at Hurst Park by the River Thames, and the other by one of its tributaries, the River Colne, at Prospect Park. Both had sequences of activity from the Neolithic to Early Saxon periods.