Copenhagen’s Planned M5 Metro Line Reaches Key Milestones

Copenhagen’s long‑planned M5 metro line is entering a decisive new phase, with tender preparations, updated environmental assessments and fresh visualisations signalling how the Danish capital’s next major transit corridor is beginning to take shape.

A New Spine Linking Central Copenhagen and Lynetteholm

The M5 line is planned as a new standalone route in the Copenhagen Metro network, conceived to connect Copenhagen Central Station with emerging neighbourhoods along the city’s eastern waterfront and the future artificial island of Lynetteholm. Publicly available planning documents describe a line that will ultimately feature nine stations, running from the main rail hub at København H via Amager to new stops serving Refshaleøen and both the southern and northern parts of Lynetteholm.

The project has been framed as a central pillar of Copenhagen’s wider harbourfront redevelopment. The line is intended to provide high‑capacity public transport to Lynetteholm, which is slated to become a major new residential and commercial district designed with climate resilience and flood protection in mind. By embedding metro capacity into the plans from the outset, planners aim to reduce private car dependence in the new neighbourhood and integrate it closely with the existing city fabric.

According to published coverage, the M5 will be built in two main stages. The first phase will focus on the southern section of the line between Copenhagen Central Station and the eastern side of Amager, while a later phase will extend across the harbour to Refshaleøen and Lynetteholm. This staged approach is intended to align construction with the pace of urban development in the eastern harbour and the build‑out of Lynetteholm itself.

Current timelines discussed in official material point to the first M5 section opening in the mid‑2030s, with full operation to Lynetteholm expected around the mid‑2040s. Those dates remain subject to the outcome of ongoing political processes, detailed design and market conditions for major infrastructure works.

From Agreement to Law: The Political and Legal Framework

The next phase of the M5 project is defined as much by legislation and governance as by engineering. A political agreement between the Danish government and the City of Copenhagen, reached in March 2025, set out a shared intention to build the line and use value created by development on Lynetteholm as a key long‑term funding source. Public information on that agreement highlights a financing model that combines land value capture, fare revenue from the wider public transport system and a multi‑year capital contribution from the municipality.

To move from agreement to implementation, a dedicated construction law for the M5 line is required. A draft bill covering the establishment of the new metro line to Lynetteholm and related fare adjustments was sent to consultation in late 2025, with municipal committees and other stakeholders invited to respond. The legislative process is designed to fix the route, define responsibilities between national and local entities, and authorise the large‑scale construction works.

Supporting legislation on the organisation of Metroselskabet, the company that builds and operates the Copenhagen Metro, is also being updated. Proposed changes aim to reflect the enlarged role of the network as it expands towards the eastern harbour and to ensure that the governance framework can handle the long construction and operating horizon for the M5.

Reports indicate that the law package related to M5 is expected to be considered by the Danish parliament around 2026. The outcome will influence not only the final scope and phasing of the line, but also how future extensions or related projects such as an eastern ring road integrate with the metro investment.

Route, Stations and Passenger Experience

The latest publicly released material offers a clearer picture of how the M5 line will be configured. The route is planned to begin at Copenhagen Central Station, providing direct interchange with regional and intercity rail services, before heading south‑east via a new station near Bryggebroen by Islands Brygge. It will then serve DR Byen, home to Danish Broadcasting and a growing media and education cluster, and continue to a station at Amagerbrogade South near Sundbyøster Plads.

From there, the line is expected to connect to the existing Lergravsparken station area and a new station at Prags Boulevard East, near Kløverparken, strengthening links to residential districts on eastern Amager. In its later phase, the line will cross the harbour to reach Refshaleøen and then continue to two separate stations on Lynetteholm, one serving the southern section of the artificial island and another in the north.

Metroselskabet has recently published early visualisations of several of the planned stations, giving residents a first glimpse of what the new stops could look like. The images suggest a design language that aligns with the rest of the Copenhagen Metro, with an emphasis on natural light, clear wayfinding and accessible layouts, while also reflecting the specific urban context of each location. One of the stations is envisaged as an elevated stop, offering views across the evolving waterfront landscape.

Passenger forecasts compiled during the planning process highlight the line’s role in relieving pressure on existing lines and S‑train corridors, particularly as population and employment in the harbour districts increase. By providing frequent, fully automated services, the M5 is expected to support Copenhagen’s objectives for sustainable mobility and compact urban growth.

Environmental Assessments and Climate‑Focused Design

Environmental impact analysis has been a central part of the M5 planning phase. Metroselskabet has prepared an environmental impact assessment and, following design changes, a supplementary report that addresses issues raised during earlier consultations. The documents consider topics such as construction noise and vibration, impacts on harbour ecology, soil handling linked to Lynetteholm’s land reclamation, and the project’s overall climate footprint.

Copenhagen’s climate strategies position public transport expansion as a key tool for cutting transport‑related emissions, and the M5 is cited as a contribution to that objective. Technical material from the metro company points to a stronger focus on carbon accounting throughout design and procurement, including efforts to optimise tunnel alignments, station structures and material choices to reduce embedded emissions while maintaining safety and capacity standards.

Reports further indicate that the M5 has been evaluated in relation to other potential public transport investments in the region, including future tram and bus rapid transit schemes, to ensure that the overall network remains coherent. The metro is envisaged as a high‑capacity backbone, with local surface options providing more fine‑grained coverage around stations and into neighbouring municipalities.

The forthcoming public consultations on the supplementary environmental documentation are expected to give residents, businesses and interest groups another opportunity to comment on the project. Feedback from these processes can still shape details of construction methods, mitigation measures and station integration with surrounding public spaces.

Tenders, Timelines and What Comes Next for Travelers

With the political direction largely set and core planning documents in place, the M5 project is now approaching the market. According to recent announcements from Metroselskabet, preparations are underway to send major construction contracts for the line out to tender. This milestone marks the transition from conceptual and statutory work into negotiations with the contracting consortia that will design and build tunnels, stations and systems.

Indicative schedules discussed in public reports outline a tender and contract award phase running through the late 2020s. Once contracts are signed, large‑scale civil works are expected to follow, including tunnel boring from Copenhagen Central Station towards eastern Amager. The complexity of working under a dense urban environment and an active harbour, combined with coordination around the phased construction of Lynetteholm, means that timelines are both lengthy and sensitive to external conditions.

For future travelers, the planned benefits are significant. When the first phase opens, passengers arriving at Copenhagen Central Station should be able to transfer directly to the M5 for fast connections to key waterfront destinations such as Islands Brygge, DR Byen and eastern Amager. As the second phase comes online, the line is expected to become the primary public transport artery for Refshaleøen and Lynetteholm, opening up new possibilities for commuting, leisure travel and tourism along the city’s transformed eastern shore.

While several years of design, consultation and construction still lie ahead, the recent wave of legal, planning and procurement activity indicates that the M5 has firmly entered its next phase. For visitors watching Copenhagen’s evolving metro map, the purple line to Lynetteholm is moving from long‑term vision toward on‑the‑ground reality.