WEST-HELSINKI LIGHT RAIL

Preparatory works

West-Helsinki Light Rail started preparatory works in summer 2025. The purpose of these works is to ensure a smooth transition into the implementation phase in spring 2026. Preparatory works include municipal engineering tasks in Lassila and ground surveys.

Municipal engineering works in Lassila

Municipal engineering works took place in Lassila’s edge park, involving relocation of the existing water utility network. These works included excavation with machinery, soil transportation, and water utility installations.

The municipal engineering works carried out by the West-Helsinki Light Rail project were completed in December 2025. Following their completion, the local electricity grid company will begin underground cabling works in the area. These works are related to dismantling the overhead power line between Pitäjänmäki and Kannelmäki.

Questions and answers from the information and discussion event held on 15 May 2025 can be found on the Events page.

Published announcements

19 June 2025 – Noisy works postponed, announcement (pdf)
6 June 2025 – Work schedule and start of noisy works, announcement (pdf)
8 May 2025 – Initial announcement of municipal engineering works in Lassila, announcement (pdf)

Ground surveys

The ground survey programme for the West-Helsinki Light Rail will commence in summer 2025, with the aim to start these surveys as early as June 2025. A more detailed schedule will be communicated as soon as it is finalised. The ground surveys involve drilling boreholes into streets or land areas using drilling rigs, from which soil samples are collected. These surveys provide detailed information on soil conditions, enabling more cost-effective planning and construction.

Ground surveys will be conducted across the entire West-Helsinki Light Rail project area, focusing especially on initial construction sites planned for early spring 2026: Vihdintie, Haaga roundabout, Turunväylä interchange area, Munkkiniemen puistotie, Töölöntori, and Linnakoskenkatu.