Invoice Finance for Construction Companies: A Complete Guide for UK Businesses

Construction companies face notoriously slow payment cycles, with retentions, applications for payment and 60-to-90-day terms compressing cash flow. Invoice finance can release cash tied up in certified valuations and approved invoices. This guide explains how the product works for construction businesses, what lenders look for, and the key structural issues to navigate before applying.

In short

  • Construction invoice finance releases cash against approved applications for payment and certified invoices, typically advancing 70 to 85 percent of the face value.
  • Retentions are usually excluded from the ledger, meaning the fundable portion of your debtor book is smaller than your total receivables.
  • Most lenders require invoices to relate to a completed stage or certified valuation rather than a work-in-progress application.
  • Domestic sub-contractor relationships and CIS deductions need to be disclosed upfront, as they affect how lenders assess debtor quality.
  • Construction sector facilities often carry slightly higher service charges than standard facilities, reflecting the complexity of verifying staged invoices.

Why Cash Flow Is a Persistent Problem in Construction

Construction businesses routinely wait longer for payment than almost any other sector. A main contractor may issue a payment notice 28 days after an application, then a further 14 days pass before funds arrive. Sub-contractors further down the supply chain often wait longer still. Retention clauses, typically holding back five percent of contract value until practical completion and a further period beyond that, mean a portion of earned income sits frozen for months or years.

Add in the seasonal nature of build programmes, the cost of materials purchased upfront, and the wage bill that runs regardless of payment timing, and it is straightforward to see why profitable construction businesses can still run short of working capital. Invoice finance addresses the gap between raising an invoice and receiving payment, giving businesses access to the majority of that cash within 24 to 48 hours of invoice approval.

How Invoice Finance Works for Construction Businesses

The mechanics follow the same broad pattern as in any other sector. Once a facility is in place, the business raises an invoice or submits an application for payment. The lender advances a percentage of the approved value, typically between 70 and 85 percent, directly to the business bank account. The remaining balance, less fees, is released when the debtor pays.

The critical word in construction is approved. Most lenders will only fund invoices where a payment certificate, architect's certificate or equivalent document confirms the sum is due. Uninstructed or disputed applications are generally excluded. This is a meaningful constraint because construction invoicing rarely follows a clean, undisputed cycle. Businesses should map their contract documentation process carefully before approaching a lender, as poor record-keeping at the application stage will directly reduce the fundable ledger value.

Factoring and invoice discounting are both available to construction businesses. Factoring involves the lender managing credit control; invoice discounting keeps that function in-house. Most established construction firms with competent finance functions prefer discounting to preserve customer relationships.

Retentions: What Lenders Will and Will Not Fund

Retentions are the most significant structural issue in construction invoice finance. A retention is a sum withheld by the client until practical completion or the expiry of a defects liability period, often six to twelve months after handover. Because the sum is not yet legally due, most mainstream invoice finance lenders will not advance against it.

This means a construction business with a gross debtor book of, say, £500,000 may have £50,000 of that in retentions, leaving only £450,000 as fundable receivables. If the advance rate is 80 percent, the facility provides £360,000 rather than the £400,000 a business might have assumed. Understanding this distinction early prevents disappointment at facility setup.

A small number of specialist lenders do offer retention finance as a separate product, releasing cash against accrued retentions ahead of the defects period ending. This is a niche product, typically priced at a premium, and usually requires the underlying construction contracts to be reviewed by the lender's solicitors. It is worth exploring alongside the main facility if retention balances are material to your working capital position.

CIS, Domestic Reverse Charge VAT and Lender Due Diligence

Two tax rules create additional complexity when lenders assess a construction ledger. The Construction Industry Scheme requires main contractors to deduct tax at source from payments to registered sub-contractors, typically at 20 percent for verified businesses or 30 percent for unverified ones. Because CIS deductions reduce the cash actually received by the sub-contractor, lenders need to understand how CIS affects net receipts versus gross invoice values on the ledger.

The domestic reverse charge for VAT, introduced in March 2021, means that for most business-to-business construction supplies within the CIS, the customer accounts for VAT rather than the supplier. This changes the gross value of invoices raised, which in turn affects advance calculations. Lenders familiar with construction will factor this in, but it is essential to disclose both CIS status and VAT treatment clearly at the application stage. Presenting a ledger without this context will slow underwriting and may result in facility terms being set incorrectly.

Providing the lender with a sample set of payment certificates, remittance advices showing CIS deductions, and recent VAT returns will accelerate the due diligence process considerably.

What Lenders Look for When Underwriting a Construction Facility

Lenders assess construction businesses against several criteria that differ from a standard commercial invoice finance application. Key areas of focus include the following.

Debtor concentration. Construction businesses often rely on a small number of main contractors or developers. A ledger where more than 40 to 50 percent of value is owed by a single debtor will attract a concentration limit, capping the advance against that debtor. This is not a barrier, but it affects the total facility size.

Contract documentation. Lenders want to see that invoices are supported by contracts, purchase orders or letters of intent. Verbal arrangements or undocumented variations are difficult to fund against.

Disputes and credit notes. Construction is dispute-prone. A ledger showing a high proportion of aged or contested invoices signals credit control risk. Lenders will typically dilute the advance rate or exclude certain debts where dispute rates are elevated.

Director personal guarantees. Most construction invoice finance facilities, particularly for smaller businesses, are supported by a personal guarantee from directors, typically unlimited or capped at a proportion of the facility limit. A debenture over company assets is also standard.

Choosing Between Factoring and Invoice Discounting for a Construction Business

The choice depends on two factors: the capacity of your internal finance team and the sensitivity of your client relationships.

Factoring hands credit control to the lender. The lender chases payment on your behalf, which is disclosed to your debtors. For a sole director running a small groundworks business without a finance function, this can relieve significant administrative pressure. The trade-off is that your clients know the arrangement exists, and some main contractors react negatively to being chased by a third party.

Invoice discounting keeps credit control in-house and is typically confidential, meaning clients are unaware of the financing arrangement. For a mid-sized mechanical and electrical contractor with a dedicated accounts team and long-standing relationships with tier-one contractors, invoice discounting is usually the better fit.

There is a middle ground. Some lenders offer a hybrid product where credit control is split, with the lender stepping in only on accounts that pass a certain number of days overdue. This can suit businesses that have the capacity to chase most accounts but want a safety net for persistent late payers.

Typical Costs and How to Evaluate a Construction Facility Quote

Construction invoice finance is generally priced slightly above the standard market because of the additional underwriting complexity. Two main charges apply.

The service charge, also called the administration fee or factoring fee, is expressed as a percentage of each invoice funded. For construction, this typically sits between 0.8 and 2.0 percent of invoice value depending on ledger size, sector risk and debtor quality. Larger facilities with well-diversified, creditworthy debtors attract lower rates.

The discount charge is the interest cost of the advance, calculated daily on the amount outstanding. With the Bank of England base rate at 4.50 percent as of March 2026, most construction facilities are priced at base rate plus a margin of between 2.5 and 5.0 percent, giving an all-in rate roughly in the range of 7.0 to 9.5 percent per annum on drawn funds.

When comparing quotes, calculate the combined annual cost based on your expected average monthly funded balance, not just the headline rates. A facility with a lower service charge but a higher discount rate may cost more overall if you carry a large average balance. Request a worked example from each provider using your actual figures before signing heads of terms.

Checklist

FAQs

Can a construction sub-contractor use invoice finance if they work under the CIS?

Yes. CIS registration does not prevent a business from accessing invoice finance. The lender will need to understand the CIS deduction rate that applies to your payments and will adjust the fundable value accordingly. Be transparent about whether you are registered at the 20 percent or 30 percent rate, and provide recent remittance advices to demonstrate how your debtors are actually paying.

Will a lender fund applications for payment before a payment certificate is issued?

Most mainstream lenders will not. They require evidence that a sum is contractually due before advancing against it, and an application for payment that has not yet been certified or confirmed by a payment notice does not meet that threshold. Some specialist lenders will consider applications in progress, but they typically apply a lower advance rate and require sight of the underlying contract.

How long does it take to set up a construction invoice finance facility?

For a straightforward application with clean documentation, four to six weeks from initial enquiry to first draw is typical. Construction facilities take longer than standard facilities because the underwriter needs to review contracts, assess debtor quality and verify CIS and VAT status. Having your last two years of filed accounts, a current aged debtor report, sample contracts and recent bank statements ready will reduce delays.

What happens if one of my main contractor clients goes into administration?

Under a recourse facility, your business remains liable to repay the advance if the debtor does not pay, regardless of the reason. Under a non-recourse facility, the lender absorbs the bad debt if insolvency is the cause of non-payment, subject to any approved credit limit set on that debtor. Construction supply chains carry meaningful insolvency risk, so understanding whether your facility is recourse or non-recourse, and checking approved limits on key debtors, is important.

Can I fund invoices raised on public sector construction contracts, such as local authority or NHS framework work?

Yes, and public sector debtors are often viewed favourably by lenders because of their low insolvency risk. Some lenders will advance at a higher rate or apply a lower service charge to public sector receivables. You will still need to ensure the invoice is supported by a payment certificate or confirmed application, and you should check whether the public body's contract terms include any prohibition on assignment of receivables, as some government contracts historically included such clauses.

OM

Oliver Mackman

Director, Market Invoice

Oliver leads Market Invoice's editorial and comparison research. With a background in UK commercial finance, he oversees provider analysis, rate verification, and industry reporting across all verticals.

Last reviewed: 4 June 2026