How the collapse of one in all Britain’s largest constructing corporations will hit Labour’s jail and colleges plan

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Dozens of schools and prisons around England and Wales face higher bills and delays to new buildings worth billions of pounds after the collapse of one of the UK’s biggest contractors.

ISG, the sixth-biggest builder in the UK, collapsed in September, leaving 2,200 workers immediately redundant and many subcontractors out of pocket. At least one firm working for ISG has gone under.

Its contracts included schools from Exeter to London, as well as four new prisons and prison upgrades from Dorset to Liverpool.

The collapse could not have come at a worse time, as the government aims to solve the prison overcrowding crisis and ramp up school-building to combat the concrete crisis.

On top of that, industry insiders say it suggests no lessons have been learned since the collapse of Carillion, another massive builder. Builders are still under-bidding in an effort to grow, and expect their suppliers to shoulder the burden. Also affected are the company’s suppliers: it collapsed owing £981m to creditors including suppliers, according to the Sunday Times.

ISG had about £2.5bn of work in progress at 57 sites, with £1.7bn of work in the pipeline, including £518m of work with the Ministry of Defence, according to Tussell, which analyses government contracts. It was also contracted to build four prisons for about £300m and about a dozen schools for about £1.2bn of government contracts.

One of its contracts was to build a new school for The Bishop’s Stortford High School, a local authority senior school in Hertfordshire with 1,250 pupils.

Headmaster Dale Reeve said he only received a tip-off of the collapse the day before the news broke, when ISG workers were finishing their last day’s work on the site.

The aftermath has been “hugely stressful”, he said. The school is more than 80 per cent complete, but he is still waiting to be able to use the sports hall and much of the car park.

“ISG left a number of subcontractors unpaid, which is making it hard for us to find people to complete the project,” he said.

The local authority is overseeing the project, meaning money is not a direct worry for him, but he does not know when the school will be finished.

The council is “working hard”, he said, however: “I want the school completed as quickly as possible. And they don’t want to spend more money than is necessary, which is totally understandable.”

ISG started off in 1989 as an interior fitter, spun out of the builder Stanhope. It was floated on the London Stock Exchange in 1997 as Interior Services Group, with most of its business in fitting offices in central London.

It then started buying up its competitors. In 2016, it was taken private by the US firm Cathexis, which is owned by Texan billionaire William Harrison. Mr Harrison also owned a slice of Britishvolt, a defunct British start-up that wanted to make batteries for electric cars. ISG was to lead construction on the project. It reportedly did not lose money on the gigafactory’s collapse.

ISG management blamed loss-making contracts it picked up in the run-up to the Covid-19 lockdowns for its ultimate end.

For some in the industry, ISG’s demise is reminiscent of the end of Carillion, another large contractor, which went bust six years ago, putting 3,000 people out of work and 450 public-sector projects on hold.

Carillion was the UK’s second-biggest builder and left behind £7bn of debts, including money owed to suppliers.

Rico Wojtulewicz, head of policy and market insights at the National Federation of Builders, said Carillion’s collapse was “not a one-off, because we’re not entirely convinced that the largest contractors aren’t still effectively funding their businesses by paying late and having loss-leading projects being paid off by other projects.

“We think that’s still going on and obviously that was the big problem with Carillion, and it seems to be a bit of a problem again with ISG.”

Top contractors often farm out work and can be late in paying their contractors. While there is an industry code over prompt payments, it is sometimes ignored, he said.

A bigger problem is customers, be they the government or private developers, choosing the cheapest offer.

“If you speak to many contractors, they often say, I don’t understand how this person won that contract. They’re never going to be able to deliver it,” he said.

Contractors including Carillion would win by making low bids, reasoning that on some contracts the publicity would make the loss-making work worthwhile.

Developers were supposed to avoid simply choosing the cheapest bid by applying the most economically advantageous tender (Meat) method, which was introduced a decade ago by the EU and listed price as just one of the factors to be considered.

Since then there have been efforts to reform Meat further as customers have still been using price as the primary metric, leading to price wars and contractors going bust.

When builders do go bust, the cost overruns can be gigantic.

The Royal Liverpool Hospital and Midland Metropolitan Hospital’s costs soared. The Royal Liverpool was due to open in 2017 and cost £335m, but structural flaws were found by the contractor that took over the work and costs ballooned. It opened five years late and cost £1bn.

More than 200 schools in the UK are partly made of a crumbling concrete known as Raac, or reinforced autoclaved aerated concrete. They will need to have parts of their buildings replaced, and the disappearance of a big contractor that would have been capable of doing the work will push up costs and timeframes for schools.

Ed Griffiths, an analyst at Barbour ABI, said “you could argue that nothing seems to have been learned from Carillion, compared to today”.

A more immediate problem is the human misery caused by ISG’s collapse.

“There are people, scaffolders in the north-west left holding the bag with half a million pounds on their books who are just sat there, waiting to hear, are we going to be paid? What are the administrators going to decide?

“It is substantial, the impact it will have on the industry, hundreds of millions of pounds in debt that possibly isn’t going to be settled.”

The Department for Education declined to comment. A Ministry of Justice spokesperson said: “We have robust contingency plans in place to mitigate the impact on our prison and court estate of ISG going into administration.

“We are working with administrators and will find alternative ways to deliver these projects where necessary.”

ISG administrators EY said: “As the business has ceased to trade, regrettably the majority of roles will be made redundant with immediate effect. Approximately 200 employees will initially be retained to assist the administrators in winding down the business.”