Costain Lined Up For South Kensington Tube Upgrade South Kensington 2026

Key Points

• Transport for London (TfL) is going to award Costain a £120 million contract for a design-and-build upgrade of South Kensington tube station according to Harmsworth of Construction News.
• Step-free access to the Circle, District, and Piccadilly line platforms will be installed, as well as improvements in ticket hall, the subway linking neighboring museums, and new entrance to the station from Thurloe Street.
• Preparatory work is planned to commence prior to 2026 at 34 Thurloe Street, while the general upgrading of the station should be completed by 2031.
• The money is sourced from TfL Business Plan and a £12 million support of Kensington and Chelsea Council and external funds from 1851 Commission.
• This project is implemented parallel to another Native Land and Places for London joint venture real estate development project designed by RSHP and featuring 50 homes and the renovation of the historic shopping arcade.

South Kensington (West London Times) September 22, 2026 — Transport for London has formally lined up engineering contractor Costain to deliver a major £120m design-and-build overhaul at South Kensington tube station, securing crucial step-free access improvements and wider structural transformations for one of the capital’s busiest cultural and transport hubs.

What are the key details of the Costain South Kensington tube station contract?

As reported by Harmsworth of Construction News, Transport for London announced its intention to award the major design-and-build contract through its Infrastructure Improvement Framework, although the transit authority did not initially disclose the exact contract value in its official public statement. However, according to independent data provider Glenigan, the total value of the contract is estimated at £120m.

Under the scope of the agreement, the contractor will carry out comprehensive detailed design and construction work to provide long-awaited step-free access to the Circle, District, and Piccadilly line platforms. Furthermore, the project encompasses crucial improvements to the station’s primary ticket hall and the pedestrian subway that links the station directly to South Kensington’s world-famous nearby museums.

Harmsworth of Construction News noted that the development also features the creation of a brand-new accessible station entrance situated at Thurloe Street. Additionally, Costain will bring a dedicated eastbound Circle and District line platform back into regular use while meticulously restoring authentic heritage features across the existing platforms.

When will construction begin and how is the project funded?

According to details outlined by Transport for London, preparatory enabling works are expected to kick off before the end of 2026. This initial eight-week package will focus on an unoccupied retail unit located at 34 Thurloe Street, carefully preparing the space to function as the station’s primary future step-free access point. Following these preliminary steps, the wider station upgrade project is targeted for final completion by 2031.

Transport for London confirmed that the scheme will be financed primarily through its internal Business Plan. This funding is bolstered by a £12m financial contribution from Kensington and Chelsea Council, alongside separate funding secured from the 1851 Commission.

Discussing the appointment, Costain rail sector director Alistair Geddes stated that:

“In close collaboration with TfL and our supply partners, we’re ready to deliver upgrades to the internationally important South Kensington station.”

How will the upgrade coordinate with neighboring property developments?

The complex engineering and station works will be carefully coordinated alongside a separate, adjacent development being delivered through a joint venture between Native Land and Places for London, the property arm of Transport for London. The architectural plans for this adjoining commercial and residential scheme were designed by RSHP and successfully received formal planning permission in December 2023.

Plans for the joint venture property development include restoring the station’s historic shopping arcade, thoroughly refurbishing surrounding retail units, and constructing 50 new homes. Additionally, a distinctive four-storey building known as the Bullnose will be constructed directly in front of the station, providing ground-floor retail and food space with modern office facilities located above.

Transport for London emphasized that while the station upgrade and the surrounding property schemes will operate under separate contracts, their respective delivery programmes will be closely managed and coordinated to minimize passenger disruption and logistical friction.

How does this fit into the broader TfL Infrastructure Improvement Framework?

Costain secured its place on the overarching framework alongside fellow contractors Amey and Dragados back in May. The Transport for London Infrastructure Improvement Framework is valued at up to £700m and utilizes collaborative early contractor involvement models alongside multi-stage contracting structures.

The framework formally runs from June 2026 through to May 2028, and includes an explicit option allowing Transport for London to extend the agreement by up to an additional two years. According to the original announcements, the South Kensington station capacity upgrade was specifically identified as one of the core projects slated for delivery through this framework when the three primary contractors were appointed.

Explore more Kensington News:

£12bn Regeneration Project Transforms West London, West Kensington 2026

Wheelchair-accessible bike expands cycling West Kensington 2026

Background of the particular development

South Kensington station serves as a critical transport artery for millions of commuters, tourists, and visitors heading to London’s museum district, including the Natural History Museum, the Science Museum, and the Victoria and Albert Museum. For decades, the station’s lack of comprehensive step-free access has posed significant accessibility challenges for disabled passengers, parents with pushchairs, and travellers with heavy luggage.

Proposals to redevelop and modernize the station have faced various iterations, planning hurdles, and funding discussions over the years. The alignment between Transport for London, local authorities, and private developers like Native Land represents a concerted effort to combine vital public infrastructure modernization with commercial regeneration, ensuring the station can cope with future passenger capacity demands while preserving its unique Victorian architectural heritage.

How can this development affect commuters and local businesses?

The £120m upgrade of South Kensington station is poised to significantly transform the daily commuting experience for thousands of passengers by finally eliminating long-standing accessibility barriers across the Circle, District, and Piccadilly lines. For regular commuters and tourists, the introduction of step-free access, a modernized ticket hall, a refreshed Thurloe Street entrance, and a dedicated eastbound platform will drastically streamline journeys and improve station flow.

However, because construction is scheduled to span several years through to 2031 alongside concurrent commercial building works by Native Land, local residents, commuters, and nearby businesses may experience temporary disruption, localized congestion, and noise during the construction phases. Over the long term, the restoration of the historic shopping arcade, the addition of 50 new homes, and enhanced retail and dining spaces in the Bullnose building are expected to breathe new economic life into the immediate area, boosting footfall and enhancing the commercial vibrancy of South Kensington once the master plan is fully realized.