Caerphilly Engages Market on £15M A469 Landslip Repair in Geotechnically Sensitive Area

Why It Matters

The project secures a critical transport link while creating a sizable opportunity for firms skilled in complex geotechnical works, reinforcing regional connectivity and infrastructure resilience.

Key Takeaways

• £15M A469 landslip repair slated 2026‑2028
• Project requires 1,919 soil nails and 289 bored piles
• Works will close A469 via Temporary Prohibition Order
• Contract awarded under NEC4, CDM 2015 compliance
• Early market engagement targets specialist geotechnical contractors

Pulse Analysis

The A469 corridor between New Tredegar and Pontlottyn has been plagued by a persistent landslip at Troedrhiwfwuch, a segment classified within Caerphilly’s strategic highway network. Since Storm Dennis in 2020, traffic has been limited to a single lane controlled by temporary signals, underscoring the site’s vulnerability. Engineers describe the ground conditions as “very complex and significant,” situated in a sensitive geotechnical setting characterized by steep topography, weak soils, and limited access. The prolonged instability not only hampers daily commutes but also threatens the reliability of a key regional link.

Caerphilly County Borough Council has launched an early market engagement to secure a specialist contractor for a £15 million remedial program scheduled from November 2026 to November 2028. The works, designed by Tetra Tech, call for 1,919 self‑drilling soil nails, 289 bored cast‑in‑place piles, gabion basket replacement, and full carriageway reconstruction with drainage, vehicle restraint and street lighting. The contract will be awarded under an NEC4 framework, with the successful bidder acting as principal contractor in compliance with CDM 2015 regulations. A Temporary Prohibition of Driving Order will close the A469 while the phased construction proceeds.

The closure and reconstruction will inevitably disrupt local traffic, affecting commuters and service access across the Upper Rhymney Valley. However, the project also presents a lucrative opportunity for firms adept at complex geotechnical interventions, especially those with proven experience in soil nailing and bored pile installation. By engaging contractors early, the council aims to mitigate land acquisition delays and streamline access planning, reflecting a broader shift toward proactive infrastructure resilience in UK local authorities. Successful delivery will reinforce the A469’s role as a vital economic corridor for the region.