Southsea Coastal Scheme: design and phasing lessons for coastal engineers
Reviewed by Joe Ashwell
First reported on New Civil Engineer
30 Second Briefing
Southsea Coastal Scheme – Frontages 4 & 5 has won the inaugural Sir John Armitt Prize for delivering a coastal defence that doubles as urban regeneration, combining new sea walls and raised promenades with stepped revetments, terraced seating and widened public realm. Designers phased construction along the 4.5km Southsea seafront to maintain access, coordinated heritage constraints around listed structures and a scheduled monument, and used 3D visualisations and full‑scale mock‑ups to align flood levels, sightlines and materials with Portsmouth City Council’s placemaking objectives.
Technical Brief
- Lessons are already being fed into subsequent Southsea frontages, reducing redesign and stakeholder negotiation time on later phases.
Our Take
Sir John Armitt’s involvement links this piece to wider UK infrastructure governance and assurance practice, signalling that lessons from Southsea’s Frontage 4 & 5 could feed into how major programmes are appraised for combining flood risk management with public realm value.
New Civil Engineer’s role here mirrors its coverage of the British Construction & Infrastructure Awards and TechFest Awards 2025, suggesting that Southsea’s integration of sustainability and placemaking may be positioned as an exemplar for award and best‑practice benchmarks in UK coastal projects.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
