Job Description Costain have won extensive work across the water sector this year to support the AMP8 investment cycle. We have been appointed by Severn Trent Water to help shape and deliver its Capital Delivery Framework as part of its capital programme for the AMP8 period between 2025 - 2030. As part of the Design and Build Framework lot, Costain brings together its design, construction, and consultancy expertise to undertake renewal and refurbishment projects and will assist Severn Trent in its target to make continuous improvements to its safety performance, whilst ensuring continuity of supply and consequently lowering costs for its customers. The Principal Design Manager will provide technical project management support and set the strategy for design management and interface between Costain, the design partners selected to support project delivery, and the Client teams for all aspects of design. The role will be key to ensuring robust, affordable, and technically compliant designs are aligned to our WiiSE objectives and delivered to programme and budget. As Principal Design Manager you will develop strong relationships and agreed ways of working with our Client approval bodies, and wider design organisations / partners. You will ensure there is integration of production thinking, innovation and sustainable principles into design activities and provide constructive challenge to strive for continuous improvement, bringing in wider organisation support as required. Resp