Ireland's Biggest Construction Projects That Never Happened – And the Plans That Could Still Return

Ireland has had some extraordinary construction projects on the drawing board over the years.

A billion-euro national stadium. An underground railway network beneath Dublin. A major events centre in Cork that had its sod turned a decade ago.

Some were cancelled before construction could begin. Others became caught up in funding problems, planning disputes or changing government priorities.

And while certain proposals have been forgotten, others are beginning to reappear in a different form.

So what happened to some of Ireland's most ambitious abandoned construction projects, how far did they actually get, and could any of these ideas eventually become reality?

 

1. Dublin's Underground Rail Network: Decades of Plans That Never Materialised

Dublin's ambition to build an underground rail network is much older than many people realise.

Over the past few decades, several major transport schemes have been proposed, including Metro North, Metro West and DART Underground.

Metro North was intended to connect Swords and Dublin Airport with the city centre. Metro West would have provided connections between suburbs including Tallaght, Clondalkin and Blanchardstown, while DART Underground proposed a rail tunnel linking existing railway lines beneath the capital.

Together, these projects represented billions of euro in potential infrastructure investment.

The plans involved extensive tunnelling, underground stations, major civil engineering works and significant changes to Dublin's transport network.

But the financial crash changed everything.

Metro West was suspended in September 2011, followed by Metro North just months later, despite Metro North having secured planning permission.

DART Underground also failed to progress in its original form.

According to a 2024 report from the Comptroller and Auditor General, approximately €225 million in public expenditure associated with the three original schemes was ultimately written off. 

Could these projects return?

MetroLink is already carrying forward much of the original Metro North ambition, although under a redesigned scheme.

Meanwhile, the possibility of a future DART tunnel remains part of long-term transport planning.

It's an interesting reminder that major infrastructure projects can disappear from the construction pipeline for years without the original need ever going away.

 

2. The Bertie Bowl: Ireland's €1 Billion Stadium That Was Never Built

At the beginning of the 2000s, Ireland had plans for a sporting development unlike anything the country had previously built.

The proposal was for a new national stadium at Abbotstown in Dublin, with seating for approximately 65,000 spectators.

Nicknamed the Bertie Bowl after then Taoiseach Bertie Ahern, the stadium was intended to form part of a much larger national sports campus.

The wider plans included indoor sporting facilities, an aquatic centre and supporting infrastructure.

It would have been a significant undertaking for the Irish construction industry, involving large-scale structural engineering, specialist stadium construction and major transport infrastructure.

However, the projected cost became the project's biggest problem.

Initial estimates were considerably lower, but an independent assessment in 2002 suggested the overall development could exceed €1 billion.

With concerns growing over public spending, the Government abandoned plans to publicly fund the stadium.

Instead, attention eventually shifted towards redeveloping Lansdowne Road, which reopened as the Aviva Stadium in 2010.

Could it return?

The original Bertie Bowl is extremely unlikely to be revived.

However, Abbotstown did develop into an important sporting location, with the National Aquatic Centre and other facilities forming part of what is now the Sport Ireland Campus.

The stadium itself never materialised, but the broader ambition to develop major sporting infrastructure at the location survived.

 

3. Cork Events Centre: The Development That Had Its Sod Turned in 2016

Few Irish construction projects demonstrate the difference between an announcement and actual delivery quite like Cork's long-awaited Events Centre.

In February 2016, then Taoiseach Enda Kenny turned the sod on the proposed development at the former Beamish & Crawford brewery site on South Main Street.

The venue was intended to transform Cork's ability to host major concerts, conferences and entertainment events.

For the city, it represented more than just another building.

The project was expected to support tourism, attract visitors and contribute to regeneration in the surrounding area.

But despite the ceremony and years of planning, the original development never progressed into the completed venue that had been promised.

Funding difficulties, rising construction costs and questions over the delivery arrangements contributed to repeated delays.

By April 2026, Cork City Council had launched a new procurement process for an events centre, with estimated costs of between €150 million and €200 million.

In October 2026, three potential proposals had been shortlisted, including options at South Main Street, the Marina and Páirc Uí Chaoimh.

Could it finally happen?

Unlike some of Ireland's abandoned developments, the Cork Events Centre is still a live ambition.

However, the latest process means the final location and design may differ considerably from what was originally proposed.

For construction professionals in Munster, it is a project worth watching, particularly given the potential opportunities across commercial construction, structural engineering and mechanical and electrical services.

Ten years after the original sod-turning ceremony, Cork is still working towards delivering the venue.

 

4. Thornton Hall: The Prison Development That Never Opened

Not every ambitious construction project involves transport, housing or commercial development.

In the mid-2000s, the Irish Government planned a major new prison complex at Thornton Hall in north County Dublin.

The development was intended to replace ageing prison facilities, including Mountjoy, and provide a modern prison campus with substantial capacity.

The State purchased approximately 150 acres of land in 2005 for around €30 million.

However, the project encountered difficulties as costs increased and Ireland's financial position deteriorated.

The original prison development was eventually shelved, leaving the State with a substantial landholding but without the facility it had intended to build.

The site subsequently became the subject of other proposals, including accommodation for international protection applicants.

Could the original prison plans return?

The site has continued to feature in discussions about Ireland's public infrastructure needs, although a revival of the original prison design should not be assumed.

Thornton Hall is an example of how the intended use of a major development site can change over time.

For the construction industry, it also highlights how public-sector projects can remain tied up in policy and funding decisions long after land has been acquired.

 

5. Dublin's Eastern Bypass: The Motorway That Would Have Completed the M50

What if the M50 had been designed as a complete motorway loop around Dublin?

For decades, proposals existed for an Eastern Bypass that would have extended the motorway network from the Dublin Tunnel towards Sandyford.

The idea was to provide an additional route around the capital, reducing the need for some traffic to travel through the city centre.

But delivering it would have been an enormous engineering challenge.

The proposed route raised questions about land availability, environmental impacts, tunnelling and the cost of constructing major infrastructure through developed parts of Dublin.

As transport policy evolved, the justification for the project also changed.

The National Transport Authority's Greater Dublin Area Transport Strategy 2022–2042 concluded that the Eastern Bypass was no longer required and would not be progressed under that strategy.

Could it return?

The original motorway proposal appears unlikely to return under current transport policy.

However, the strategy also considered retaining part of the southern corridor for potential sustainable transport infrastructure.

It's another example of how an abandoned construction proposal can leave behind opportunities for a completely different type of development.

 

6. Shannon LNG: The Major Kerry Energy Project That Became a Planning Battle

Along the Shannon Estuary, between Tarbert and Ballylongford in County Kerry, plans for a major energy development have been discussed for almost two decades.

The Shannon LNG proposal originally centred on developing infrastructure to import liquefied natural gas.

Over time, the plans evolved into the proposed Shannon Technology and Energy Park, involving a gas-fired power station, battery energy storage, LNG infrastructure and associated marine facilities.

The scale of the proposed works was substantial.

It would involve specialist energy infrastructure, civil engineering, electrical works, grid connections and marine construction.

However, the development became the subject of a lengthy planning and legal dispute.

In September 2023, An Bord Pleanála refused permission for the wider energy park proposal, citing conflicts with Government policy.

That decision was overturned by the High Court in September 2024, requiring the planning application to be reconsidered.

Meanwhile, a separate application for a 600MW gas-fired power plant and battery storage facility received permission in March 2025. A legal challenge to that permission was dismissed in April 2026.

Could the development still happen?

The project has not been permanently abandoned.

As of October 2026, the wider Shannon Technology and Energy Park application remained subject to a renewed planning decision.

Its future also sits within a much larger national debate about energy security, gas infrastructure and Ireland's transition towards renewable electricity.

The separate State-led strategic gas emergency reserve proposal should not be confused with this privately proposed development. 

For construction professionals, Shannon LNG is particularly interesting because it shows how a project can remain under consideration for years while its design, planning position and commercial prospects continue to change.

 

What Can Ireland's Abandoned Construction Projects Tell Us About the Future?

Looking back at these developments, it's striking how many failed for reasons that had relatively little to do with whether they could physically be built.

Ireland had the engineering expertise to construct major railways, stadiums, energy facilities and public buildings.

But engineering capability alone doesn't guarantee that a project will proceed.

Funding, planning, political priorities and economic conditions can all determine whether a development moves beyond the drawing board.

And in some cases, the original need remains long after the project itself has been cancelled.

Dublin still needs better transport connections. Cork still wants a major events venue. Ireland continues to invest in sporting facilities, public infrastructure and energy security.

The solutions may look different from those originally proposed, but many of the same challenges remain.

For Ireland's construction industry, these projects also offer an interesting perspective on the country's future pipeline of work.

Major announcements can generate excitement, but there is a considerable difference between a proposed investment and a development that has secured funding, planning permission and a route to construction.

Some of Ireland's biggest abandoned projects may never return.

Others could eventually become some of the country's most significant construction developments.

And it raises an interesting question: which of the major projects being discussed in Ireland today might still be waiting to be built twenty years from now?