Invoice Finance for Construction Companies

Construction businesses spend money before they earn it. Materials are purchased, plant is hired, and labour costs run from the first day on site, well before a project is complete and an invoice can be raised. When that invoice goes out on 60 or 90-day terms, the contractor is waiting months for money they have already spent.

Retention clauses compound the problem. Most main contracts withhold 5 to 10% of the contract value until a defects period expires, typically six to twelve months after completion. That is real money out of reach while the next project is already running and consuming cash.

Invoice finance does not recover retentions, but it does release the 90 to 95% of contract value not held in retention far sooner than waiting on client payment terms. For most construction businesses, that is enough to keep operations running without leaning on overdrafts or personal funds.

The cash flow problem in construction

Take a groundworks subcontractor with a £200,000 contract on a residential development. Aggregates, drainage materials, and concrete go on site in the first two weeks. Labour costs are running from week one. By month two, the subcontractor has committed £60,000 in costs and raised its first application for payment. The main contractor's payment terms are 45 days from the application date. The cash arrives in month four.

Meanwhile, the next contract has started.

This is not unusual. It is how most construction businesses operate. Cash out precedes cash in by months, the cycle repeats with every new contract, and the cumulative working capital gap grows as the business wins more work. Invoice finance closes that gap by advancing cash against applications for payment as they are raised, without waiting for the main contractor to settle.

How invoice finance works for construction businesses

The mechanics follow the standard model. You raise an application for payment or invoice, notify your lender, and receive an advance of typically 80 to 90% of the certified value within 24 to 48 hours. When the client pays, the lender releases the remaining balance minus their fees.

The key difference for construction is that many specialist providers will advance against applications for payment before they become formal invoices. This matters because construction payment cycles run on applications and valuations in many cases, particularly on larger contracts where the main contractor certifies work monthly rather than on receipt of a final invoice.

For a broader overview of how invoice finance works across all industries, see our guide to what invoice finance is.

Factoring or discounting for construction businesses?

Invoice factoring is the more common choice for subcontractors and smaller contractors. The lender takes on credit control, chasing payment from the main contractor or client on your behalf. In construction, where chasing a main contractor for overdue payment can feel like a relationship risk, many businesses find it easier to let the lender handle collections.

Invoice discounting suits larger contractors with their own finance teams. The arrangement stays confidential, you manage your own collections, and the lender remains in the background. The minimum turnover threshold for discounting typically sits at £500,000 or above.

For most construction businesses working at subcontractor level, factoring is the more accessible and lower-friction starting point. Our guide to invoice discounting vs factoring covers the comparison in full.

What to look for in a construction finance facility

Not all invoice finance providers understand construction. The specific features to look for are:

• Ability to advance against applications for payment, not just formal invoices

• Understanding of CIS (Construction Industry Scheme) deductions, which reduce the net payment amount and affect how the facility is structured

• Retention handling: the lender should identify what proportion of the ledger is in retention and exclude it from advances accordingly

• Concentrated debtor books: subcontractors often have one or two main contractor clients representing the bulk of turnover, so a lender willing to advance against this concentration is important

A general lender unfamiliar with construction may treat all four of these as complications. A specialist provider handles them as standard.

Is invoice finance right for your construction business?

If your business is profitable but cash is persistently tight because clients pay slowly, invoice finance is likely the most direct solution available. It works for subcontractors and contractors billing other businesses on credit terms, with turnover generally above £50,000 to £100,000.

You can get an invoice finance quote through HowMuch and compare providers with experience working in the construction sector.

Frequently asked questions

Can a small construction business use invoice finance?

Yes. Most lenders consider businesses from around £50,000 to £100,000 in annual turnover. Factoring providers assess your clients' creditworthiness more heavily than your own trading history, which means a small subcontractor invoicing a large main contractor can often qualify even in the early stages of trading.

Does invoice finance cover retention payments?

No. Invoice finance advances against the certified or invoiced amount, with retention excluded from the facility until the main contractor formally releases it. Some specialist providers offer separate retention finance products, but these are distinct from the core invoice finance facility and worth asking about separately.

What is CIS and how does it affect invoice finance?

The Construction Industry Scheme requires main contractors to deduct tax at source from payments to subcontractors, which means the cash you receive is less than the gross invoice value. A construction-aware lender will understand this and structure advances against the net figure, rather than advancing on the gross and leaving a shortfall when payment arrives.

Is invoice finance better for construction than a business overdraft?

An overdraft is a fixed credit line that does not grow with your business. Invoice finance scales with your turnover. As you take on more contracts and raise more invoices, your available funding increases with them. For a growing contractor winning larger or more frequent work, this makes invoice finance a more responsive working capital tool than a static overdraft limit.