Oberwil Roadworks: Therwilerstrasse Renewal and Utility Upgrades Underway in Basel-Landschaft
OBERWIL, Switzerland — Residents and commuters in the Swiss municipality of Oberwil, part of the canton of Basel-Landschaft, are navigating a significant infrastructure project this spring as authorities renew Therwilerstrasse and upgrade underground utilities. The roadworks, which began in April 2026, are part of a broader effort by the canton’s civil engineering department to modernize its transportation network although addressing long-term maintenance needs. For drivers, cyclists, and local businesses, the project brings both short-term disruptions and the promise of improved road safety and reliability.
The Tiefbauamt (Civil Engineering Office) of Basel-Landschaft is overseeing the project, which involves resurfacing Therwilerstrasse, replacing aging water and sewage pipes, and installing new electrical and telecommunications conduits. The road, a key connector between Oberwil and neighboring Therwil, serves as a vital route for daily commuters, school buses, and delivery vehicles. While the works are expected to last several months, officials have emphasized that the upgrades are necessary to prevent future road failures and reduce long-term maintenance costs.
“This is not just about fixing potholes,” said a spokesperson for the Tiefbauamt in a recent statement. “It’s about ensuring that Therwilerstrasse remains safe, functional, and resilient for the next 20 to 30 years. The utility upgrades are equally critical, as they will assist prevent water main breaks and other disruptions that have caused problems in the past.” The project aligns with the canton’s Strassennetzplan (Road Network Plan) 2022–2037, which prioritizes the maintenance and modernization of high-traffic routes like Therwilerstrasse.
What the Project Entails
The Therwilerstrasse renewal is a multi-phase effort that includes the following key components:
- Road resurfacing: The existing asphalt will be removed and replaced with a new, more durable surface designed to withstand heavy traffic and harsh weather conditions. The new pavement will also include improved drainage systems to reduce the risk of flooding during heavy rain.
- Utility upgrades: Underground water, sewage, and electrical lines will be replaced or reinforced. This includes the installation of new fiber-optic cables to support expanding broadband and telecommunications needs in the area.
- Pedestrian and cyclist safety: Sidewalks and bike lanes along Therwilerstrasse will be repaved and, in some sections, widened to improve safety for non-motorized users. The project also includes the installation of new pedestrian crossings with enhanced visibility.
- Traffic management: Temporary traffic lights and lane closures will be in place to ensure the safety of workers and road users. The Tiefbauamt has coordinated with local police to minimize congestion and provide alternative routes for drivers.
The project is being carried out in stages to minimize disruption. The first phase, which began in late April, focuses on the northern section of Therwilerstrasse, near its intersection with Hauptstrasse. Perform is expected to progress southward over the coming months, with completion tentatively scheduled for late 2026. However, officials have cautioned that timelines may shift depending on weather conditions and unforeseen challenges, such as the discovery of additional underground infrastructure issues.
Impact on Residents and Commuters
For the roughly 11,000 residents of Oberwil, the roadworks are a temporary inconvenience with long-term benefits. Therwilerstrasse is a heavily trafficked route, particularly during morning and evening rush hours, when commuters travel to and from Basel and surrounding municipalities. The Tiefbauamt has urged drivers to plan for delays and consider alternative routes, such as the nearby Kantonsstrasse K244 or local residential streets, where possible.
Local businesses along Therwilerstrasse have also been affected. Some shops and restaurants have reported a slight drop in foot traffic since the works began, though most remain optimistic about the project’s eventual benefits. “It’s a bit of a hassle now, but we understand it’s necessary,” said Markus Weber, owner of a café near the construction zone. “Once the road is finished, it will be smoother for our customers to get here, and the improved sidewalks will make it easier for pedestrians to stop by.”
Public transportation has also been impacted. Bus routes operated by Baselland Transport (BLT) that serve Therwilerstrasse have been temporarily rerouted, with some stops relocated or suspended. The BLT has advised passengers to check its website or mobile app for real-time updates on schedule changes. Cyclists, too, have been encouraged to apply detours, as bike lanes along Therwilerstrasse are partially closed during construction.
Why This Project Matters for Basel-Landschaft
The Therwilerstrasse renewal is part of a larger effort by Basel-Landschaft to modernize its road network, which spans over 2,100 kilometers and includes more than 1,000 bridges, tunnels, and other structures. The canton’s Strassennetzplan 2022–2037 outlines a long-term strategy for maintaining and upgrading this infrastructure, with a focus on safety, sustainability, and efficiency. The plan prioritizes projects based on factors such as traffic volume, accident rates, and the age of existing infrastructure.
Therwilerstrasse was identified as a high-priority route due to its heavy use and the age of its underground utilities. According to the Tiefbauamt, the road had not undergone major repairs in over 15 years, and its water and sewage pipes were nearing the end of their expected lifespan. By addressing these issues now, the canton aims to avoid more costly emergency repairs in the future. The project is also an opportunity to future-proof the road by installing infrastructure that can support electric vehicle charging stations and smart traffic management systems.
Financially, the project is being funded through the canton’s Investitionsrahmenkredit (Investment Framework Credit), a four-year budget approved by the Grosser Rat (Cantonal Parliament) in 2025. The IRK allocates funds for major infrastructure projects, with a focus on balancing immediate needs with long-term sustainability. For 2026–2029, the IRK includes approximately CHF 1.2 billion for road and utility upgrades across Basel-Landschaft, with Therwilerstrasse being one of the flagship projects.
How to Stay Informed
Residents and commuters can stay updated on the progress of the Therwilerstrasse project through several official channels:
- Tiefbauamt Basel-Landschaft: The canton’s civil engineering office provides regular updates on its Baustellen (Construction Sites) webpage, including maps of the affected areas, expected timelines, and contact information for project managers.
- Baselland Transport (BLT): For updates on bus route changes, passengers can visit the BLT website or download its mobile app for real-time alerts.
- Local media: Outlets such as Basellandschaftliche Zeitung and Telebasel are covering the project and providing updates on traffic disruptions and community feedback.
- Social media: The Tiefbauamt occasionally shares updates on its Facebook page and other platforms.
For those who prefer in-person updates, the Tiefbauamt has also set up an information kiosk near the construction site, where residents can speak with project representatives and pick up printed materials about the works.
Looking Ahead
While the Therwilerstrasse project is expected to wrap up by the end of 2026, it is just one of many infrastructure initiatives underway in Basel-Landschaft. The canton’s Strassennetzplan includes dozens of other projects, ranging from minor road repairs to major expansions of cycling infrastructure. In Oberwil alone, additional works are planned for later this year, including upgrades to the town’s water treatment facilities and the expansion of its pedestrian zones.
For now, the focus remains on completing the Therwilerstrasse renewal as efficiently and safely as possible. The Tiefbauamt has assured residents that it is committed to minimizing disruptions and keeping the community informed throughout the process. “We understand that construction can be frustrating, but we appreciate the patience and cooperation of everyone affected,” said the Tiefbauamt spokesperson. “Once the project is complete, Therwilerstrasse will be safer, more reliable, and better equipped to serve Oberwil’s growing population.”
The next official update on the project is expected in June 2026, when the Tiefbauamt will provide a progress report and any adjustments to the timeline. In the meantime, residents and commuters are encouraged to check the official sources listed above for the latest information.
Have you been affected by the Therwilerstrasse roadworks? Share your experiences or questions in the comments below, and don’t forget to share this article with others who may be navigating the construction zone.