Highway 4 Lahdenväylä between Ring Road I and Ring Road III and Ilmasilta Interchange, Alliance; Preliminary Request for Tenders

Summary

The procurement concerns the construction of the Highway 4 Lahdenväylä section between Ring Road I and Ring Road III and the Ilmasilta grade-separated interchange in Helsinki. The project will be delivered using an alliance model, with the selected contract partner carrying out the construction in cooperation with the contracting authorities. The scope includes additional lanes on Highway 4 and Ring Road I, improvements to the Kivikko and Tattariharju interchanges, construction of the new Ilmasilta interchange, widening and repair of existing bridges, construction of new bridges, approximately 24,000 m² of piled slab, approximately 320 km of column stabilization, 1.8 km of noise barriers, approximately 44,000 m² of groundwater protection, retaining walls, renewal of lighting, utility and equipment relocations, geogrids and surcharge embankments. The development phase is expected to start in January 2027 and the implementation phase during 2027. The estimated total project cost is approximately EUR 100 million. The deadline for participation or submission is 28 September 2026 at 00:00. Precise qualification, exclusion, compliance and technical requirements were not included in the machine-readable notice and must be checked in the official tender documents.