A project manager in Lagos once told me his contractor had to re-mobilise piling equipment midway through a job because the geotechnical report — procured cheaply and quickly — had missed a soft clay lens at 8 metres depth. The pile specification changed, the programme slipped by six weeks, and the cost overrun wiped out…

A five-storey residential building in Lekki Phase 1. Soil investigation reports showing soft, compressible clay to a depth of 12 metres. The client wants a pad foundation because the contractor priced it lower. The geotechnical engineer recommends driven piles. The architect has already drawn the ground floor slab. And the project is supposed to start…