Excavations in Bognor Regis

For a standalone anchor design package covering a typical retaining wall or excavation support in Bognor Regis, the fee ranges from £820 for a straightforward temporary works design to £3,050 for a comprehensive permanent anchor scheme with corrosion protection Class I, finite element verification, and full construction-phase support. The final figure depends on the number of anchor rows, the complexity of the ground profile, and whether proof load testing supervision is included.

The decision hinges on allowable deformation. If the structure behind the anchor can tolerate virtually no movement—say, an existing building facade within Bognor Regis town centre—we specify an active anchor prestressed to 80–100% of the working load. Passive anchors are acceptable where some millimetres of displacement are permissible before the anchor engages, such as in temporary open-cut excavations or slope regrading projects. We assess the serviceability limit state and the proximity of sensitive structures to make the final recommendation.

BS 8081 mandates three types: suitability tests on sacrificial anchors before production drilling (up to 1.5 x working load), proof load tests on every production anchor (1.25 x working load), and a subset of extended creep tests where the load is held for up to 24 hours to confirm stable behaviour. In Bognor Regis, we typically recommend creep testing on at least 5% of permanent anchors due to the time-dependent deformation properties of the Lambeth Group clays.