Why builders run into cashflow trouble – and how to avoid it

Construction is consistently the sector with the highest number of company insolvencies in the UK. According to the Insolvency Service's latest figures (published June 2025), construction accounted for 4,032 insolvencies in the 12 months to April 2025 – 17% of all recorded cases, more than any other industry.

Many of those businesses weren't short of work, they were short of cash. And that distinction is critical.

Cashflow and profit are not the same thing, and confusing the two is one of the most common, and most costly, mistakes in the building industry. As Roger Brown of Bibby Financial Services puts it on our Build Up podcast: ‘You can be profitable, but if you've got no cash… you're dead if you haven't got cash.’

This guide covers what cashflow management actually means for a building business, the most common reasons things go wrong, and what you can do to protect yourself – before problems start and after they appear.

What is cashflow management in construction?

Profit is what's left when you subtract your costs from your revenue. Cashflow is about timing – whether money is in your account when you need it to pay wages, suppliers and overheads.

A business can look profitable on paper while facing a genuine cash crisis. If you've completed £80,000 of work but you're still waiting on three invoices, the profit exists in theory, but the cash doesn't. In the meantime, your suppliers still need paying, your subbies still need their wages, and your bank balance is stretched.

David Gutierrez, Managing Director of FMB member company Nest Building Company Ltd, describes the trap clearly in our podcast episode about managing your finances. His business scaled up to chase larger, higher-revenue projects, only to find margins were often identical to the smaller jobs – but the costs, headcount and cashflow pressure were significantly higher. Bigger turnover, same profit.

Listen to the full conversation on the Build Up podcast →

Quick check: are you at risk?

These are the early warning signs we hear most often from FMB members:

• You're waiting on one or two large payments before you can move forward
• You're taking on work mainly to cover short-term cash gaps
• Jobs are regularly running longer than planned
• You're not sure what payments are due in the next fortnight
• Invoicing is falling behind the work on site
• A payment problem on one job is putting pressure on another

If more than one of these sounds familiar, it's worth reviewing your cashflow processes now – before they become a bigger problem.

What causes cashflow problems in building businesses?

Cashflow issues are rarely caused by one single thing. They tend to build up through a combination of issues, often over months before they become a crisis. Let’s look at some of the root causes.

Pricing that doesn't cover your real costs

Under-pricing is one of the most common and damaging cashflow problems in the industry. It happens when:

• Costs that get underestimated
• Overheads aren’t fully included
• Prices are reduced to undercut competitor quotes

Overheads are the element most commonly left out. Direct labour and materials tend to get priced in, but the cost of running the business itself – your time managing jobs and quoting, van, fuel and tools, insurance, accounting, admin – often doesn't. If they're not in your price, they’ll be coming straight out of your profit margin.

See also: How to raise your prices without losing work →

Payments that don't match the work

Even when jobs are priced correctly, cashflow becomes difficult if there's a long gap between completing work and receiving payment. Long payment terms, infrequent invoicing and delayed final payments all contribute. Our FMB membership team report that late payment at final invoice stage is an increasing problem for the builders they speak to.

The principle that experienced builders use to protect themselves is making projects as self-funding as possible: structuring stage payments so money arrives either before or at the point that you need to pay your suppliers. Aiden Cropper describes his approach on the podcast: he prefers to invoice fortnightly against a transparent breakdown of completed items, so there's never any ambiguity about what's been done and what's owed.

See also: How to get paid as a builder →

Poor visibility of money coming in and going out

Relying on your bank balance alone tells you where you are today. It doesn't tell you what's coming in three weeks, or what bills land in six. Without a clear forward view, it's harder to spot problems early, plan for upcoming costs, or make sensible decisions about which jobs to take on.

This is a pattern Roger Brown identifies among builders who come to Bibby for finance: many are managing by feel rather than by forecast. Getting proper visibility – through bookkeeping software, a simple cashflow spreadsheet, or both – changes the decisions you're able to make.

Delays and changes during the project

Delays affect timelines, and timelines affect when you can invoice. Variations that aren't confirmed in writing, or that aren't invoiced promptly, are essentially free work.

The fix is consistent process:

• Confirm verbal instructions in writing as quickly as possible.
• Use a change of work form, so you have a written agreement with the client. FMB members can access these as part of our suite of FMB contracts .
• Invoice for changes as soon as they're agreed rather than letting them stack up to the end of a job.

Taking on more work than your cashflow can support

More jobs means more upfront costs – materials, labour, plant – before money comes in. Growth without cashflow control can put serious strain on a business even when every individual job looks profitable. This is especially acute for building businesses coming from a trade background, where the financial management side of running a business has to be built up alongside everything else.

Choosing the wrong clients

Cashflow problems are more likely on projects where clients are difficult, communication is unclear or payment culture is poor. Vague scope, unrealistic budgets and constant changes all increase the chance of delays and disputes. Running a credit check on commercial clients before agreeing to work with them is a straightforward step that many builders overlook. As Roger Brown notes in the podcast, a credit reference agency check takes very little time – and can reveal a lot.

Practical steps to protect your cashflow

There's no single fix, but a few consistent practices reduce risk significantly.

1. Price properly – every time

Make sure every quote includes your full direct costs, your overheads and a realistic margin. Build in a contingency appropriate to the job: ground works with unknown ground conditions carry more risk than straightforward brickwork, and your price should reflect that. Review your pricing regularly as material and labour costs change.

A quantity surveyor can be a worthwhile investment if you're not confident in your estimating – they'll know current market rates and have the data to price accurately.

Related: How to raise your prices without losing work →

2. Structure payments to protect your position

How you set up payments can make a significant practical difference:

• Use milestone-based stage payments rather than waiting until project completion.
• Invoice fortnightly rather than monthly where possible.
• Keep payment terms short – seven or fourteen days, not thirty.
• Make sure invoices are clear, detailed and easy to check – invoices that are simple to verify get paid faster.
• Invoice promptly and chase as soon as terms are exceeded.

 

FMB contracts are available to our members and include variable payment terms, so you can set seven-day rather than fourteen-day periods where appropriate. They also support multiple stage payments, making it easier to structure jobs for better cashflow from the outset.

Find out more about FMB contracts → 

3. Use a contract – and use it correctly

Every job should be covered by a written contract that sets out payment stages, amounts, due dates and what happens if payments are missed. Contracts provide the foundation for everything else: without one, disputes are harder to resolve and late payment is harder to challenge.

Our guide about how to get paid as a builder covers this in detail, including what to do if a client doesn't pay and how to use FMB contracts effectively. 

4. Set up savings pots for tax and VAT

One of the most consistent pieces of advice from the finance professionals in our podcast and webinar content: as each payment comes in, move a percentage straight into separate pots for VAT, corporation tax and a general reserve. When the quarterly VAT bill arrives, the money is already there. This removes one of the most common sources of cashflow shock for small building businesses.

5. Build a cashflow forecast – and keep it current

A 12-month rolling forecast, updated weekly, gives you the visibility to make informed decisions. It doesn't need to be complicated: a spreadsheet broken down by job, with expected payments in and costs out, is a solid starting point. Bookkeeping tools like Xero, QuickBooks or FreeAgent can integrate with your accounts and make this easier to maintain.

The critical thing is accuracy. A forecast based on out-of-date figures gives you a false sense of security. Weekly bookkeeping, or at minimum every two to three times a week, keeps the picture honest.

6. Work with your accountant or bookkeeper regularly

If you choose to work with an accountant, it shouldn't just be a once-a-year relationship. A good bookkeeper who understands construction can help you track job-level profitability, spot patterns early and make better decisions about which work to take on. As Aiden Cropper puts it: getting that support in place was key to the financial stability he's built since the early days of his business.

7. Manage your expenditure tightly

On the outgoings side:

• Track costs as you go – don't wait until a job is complete to find out where margins went.
• Make full use of supplier credit terms: pay on time, but not early.
• Order materials when you need them, not weeks in advance.
• Review labour and plant levels on site regularly.
• Track material wastage and return unused stock where you have an agreement to do so.
• Review subscriptions and ongoing costs periodically – it's easy to keep paying for things that aren't delivering value.

8. Act early when problems appear

Small issues are easier to resolve early. Chase overdue invoices promptly, address client concerns before they turn into disputes, and review your cashflow regularly so problems don't go unnoticed. Under the Late Payment of Commercial Debts Act , you're entitled to charge statutory interest on overdue invoices – don't be afraid to use that right.

For a full step-by-step guide to chasing and recovering late payments, see: How to get paid as a builder →

The bottom line

Cashflow problems are common across construction, but they're not inevitable.

The businesses that stay solvent through difficult trading conditions tend to share a few habits to stay ahead – here’s what you can do:

• Price for the real cost of doing business, not just the job in front of them.
• Treat payment structure as a business decision, not an afterthought.
• Maintain enough financial visibility to act before small problems become serious ones.

The pressures are real – rising material costs, slow-paying clients, skill shortages. But the businesses most at risk are often those where the processes haven't kept pace with the workload.

If you recognise any of the patterns in this article, the FMB has practical support available including contracts, legal helplines and business coaching. The resources linked to in this article are a good place to start.

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Frequently asked questions about cashflow