Invoice Finance for Construction: How It Works and Who It Suits

Why Standard Invoice Finance Doesn't Always Work for Construction

Invoice finance is one of the most effective funding tools for construction businesses, but only if the provider understands how construction payments actually work. Most invoice finance companies are set up for standard commercial invoices: you deliver goods, send an invoice, the customer pays in 30 days.

Construction doesn't work like that. You submit monthly applications for payment, based on a QS valuation of work done. The client's QS reviews and adjusts. A certificate is issued (sometimes weeks later). Retention is deducted. Payment follows, eventually. A standard invoice finance provider looking at this process may not know what to do with it.

How Construction Invoice Finance Works

A specialist construction invoice finance provider understands the payment cycle. Here's the typical process:

You submit an application for payment to your client, as normal. A copy goes to your invoice finance provider.
The provider advances a percentage of the application value, typically 70–85% of the amount net of retention. This cash arrives within 24–48 hours.
Your client's QS values the work and issues a certificate. If the certified amount differs from your application, the advance is adjusted.
The client pays (to the finance provider or to you, depending on the facility type). You receive the remaining balance minus the provider's fee.

The key difference from standard invoice finance is that the provider works with applications and valuations, not just invoices. They understand that the certified amount may differ from the applied amount, and they manage the process accordingly.

Certified vs Uncertified Invoices

This distinction matters significantly for construction invoice finance:

Certified Invoices

These are applications that have been valued and certified by the client's QS or contract administrator. A payment certificate confirms the amount due and the payment date. Certified invoices are lower risk for the finance provider because the amount has been agreed by both parties.

Higher advance rate: Typically 80–85% of certified value
Lower cost: Reduced risk means lower fees
Faster processing: Less due diligence needed per draw

Uncertified Applications

These are applications you've submitted but the client hasn't yet valued or certified. They're higher risk because the final certified amount could be less than applied for, and disputes can arise.

Lower advance rate: Typically 60–75% of applied value
Higher cost: More risk for the provider
Not all providers offer this: Some will only advance against certified amounts

If you need cash quickly, before certification, look for a provider willing to advance against uncertified applications, understanding that the advance may be adjusted when the certificate arrives.

How Retention Affects Your Facility

Retention is the 3–5% deducted from each payment and held until practical completion (and sometimes 12 months beyond). Most invoice finance facilities exclude retention from the advance calculation. If your application is for £100,000 and 5% retention applies, the financeable amount is £95,000, and your advance is 80–85% of that.

Some specialist providers offer retention finance as a separate facility, effectively lending against retention balances due to be released. This is niche but valuable for subcontractors with large retention balances spread across multiple contracts.

Stage Payments and Milestone-Based Contracts

Some construction contracts use stage payments rather than monthly valuations. Payment is triggered when specific milestones are reached (foundations complete, watertight, first fix, second fix, handover). This creates lumpier cash flow than monthly applications.

Invoice finance works with stage payment contracts, but the provider needs to understand the milestone structure and payment triggers. Cash flow between milestones may need supplementing with a working capital facility, since there's no monthly application to finance.

Factoring vs Discounting for Construction

Construction Factoring

The finance provider handles credit control, chasing your clients for payment. This can be sensitive in construction, where relationships with main contractors and clients matter. Some subcontractors worry that having a third party chase payments signals financial weakness.

Suits: Smaller subcontractors without dedicated accounts staff
Risk: Client relationship impact, though good factors handle this professionally
Cost: Higher service fee (0.75–2.5% of turnover) because credit control is included

Construction Invoice Discounting

You retain control of your own credit management. Your clients pay you as normal and may not know you're using invoice finance. This is confidential and protects commercial relationships.

Suits: Larger subcontractors with established finance/accounts functions
Requirement: Usually needs £500K+ turnover and robust internal processes
Cost: Lower service fee but you handle credit control yourself

Who Does Construction Invoice Finance Suit?

Subcontractors (M&E, groundworks, drylining, roofing, cladding) with multiple live contracts and regular monthly applications
Specialist contractors with longer payment terms from main contractors
Growing contractors winning more work and needing cash to fund mobilisation across multiple projects
Contractors with concentration risk, though facilities may be limited if one client represents a large share of turnover

Choosing a Provider: What to Ask

Do you work with construction applications? Not just standard invoices.
Do you advance against uncertified applications? Important if you need cash before certification.
How do you handle valuation adjustments? What happens when the certified amount is less than applied?
What are your concentration limits? If 50% of your work is for one client, will that be a problem?
Do you offer retention finance? Useful if retention balances are significant.
What's the minimum contract term? 12 months is standard; some offer 6 or even month-to-month.
Are there exit fees? Understand the cost of leaving if the facility doesn't work for you.

Typical Costs

Construction invoice finance typically costs more than standard commercial invoice finance due to the additional complexity. As a rough guide:

Service fee: 0.5–2.5% of turnover (higher for factoring, lower for discounting)
Discount charge: 2–4% over base rate on the advanced amount
Annual cost on £1M turnover: £15,000–£35,000 depending on structure

Compare this against the cost of the problem: turning down contracts, paying sub-contractors late, or funding the gap from director loans or overdrafts.

Getting Started

The right construction invoice finance provider makes a real difference. Not just in cost, but in how smoothly the facility operates day to day. A provider that understands applications, valuations, retention, and the realities of construction payment cycles will work with you rather than against you.

Get a free assessment. We work with specialist construction finance providers and can match you to the right facility for your business. No upfront fees, no obligation, no hard credit search until you're ready to proceed.