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Best invoice factoring solutions for UK construction firms (2025)

Construction is the UK's worst sector for late payment. Here are the best invoice factoring providers for construction SMEs — plus how embedded invoice financing lets platforms and contractors pay subcontractors instantly.

8 min read

July 21, 2026

TL;DR

Construction is the UK’s worst sector for late payment. Large construction firms paid one in seven invoices (14%) after agreed terms in 2025, and 95% of construction companies report rising payment delays — the highest of any sector (Construction News, Coface 2025 UK Payment Survey).
The best direct factoring provider for most construction SMEs is a specialist that funds against applications for payment, not just certified invoices — Bibby Financial Services leads here, with Close Brothers, NatWest/RBS, HSBC, Sonovate and Kriya as strong alternatives.
Retentions, contra-charges, and CIS deductions make construction factoring more complex than standard invoice finance. Pick a provider that underwrites construction, not one that treats it as an exception.
If you’re a construction platform, ERP, or main contractor wanting to pay subcontractors instantly rather than borrow against your own invoices, embedded invoice financing (Aria) is a different model: the debtor is underwritten, the long tail of small suppliers gets funded, and the risk sits off your balance sheet.

What is invoice factoring, and why is it different in construction?

Invoice factoring turns unpaid invoices into cash now. You sell an invoice to a factor, receive most of its value within 24 hours, and the factor collects payment from your customer.

In construction, that simple model hits three complications that general factors handle badly:

Retentions. Typically 3–5% of each payment is held back until practical completion, sometimes for 12 months or more. Many factors won’t advance against retained sums at all.
Applications for payment, not invoices. Construction bills through interim applications and payment certificates, not clean invoices. A factor that only funds certified invoices leaves you waiting.
Contra-charges and disputes. Main contractors routinely deduct for defects, delays, or materials. That makes the true value of a construction receivable harder to underwrite — and riskier for the factor.

The takeaway: a construction firm should never pick a factor on headline rate alone. Pick the one that understands how construction actually gets paid.

How bad is late payment in UK construction?

Bad enough that it’s a structural problem, not a cash-flow blip.

Construction firms take a median of 33 days to pay suppliers — a day longer than the 32-day all-sector average (Build UK / gov.uk payment data).
But averages hide the tail: construction records average actual payment times of around 61 days against typical 30-day terms, and one survey put the longest average delays in construction at 38.2 days (Coface).
14% of invoices to large construction firms were paid late in 2025 — one in seven (Construction News).
95% of construction companies report worsening payment delays — the most affected sector in the UK (Coface 2025 UK Payment Survey).

Zoom out and the scale is global: €3.2 trillion is trapped in unpaid B2B invoices worldwide at any given moment, much of it carried by small suppliers waiting up to 90 days to be paid. Construction’s subcontractor chains are one of the most concentrated versions of that problem.

That gap is why factoring exists — and why the right provider matters.

What should a construction firm look for in a factoring provider?

Score any provider against these six criteria before signing:

Construction-specific underwriting. Do they fund against applications for payment and stage billing, or only certified invoices?
Advance rate. How much of the invoice do you get up front? Construction-specialist facilities reach up to 100%; general facilities sit around 80–90%.
Retention handling. Will they advance against retentions, or exclude them?
Speed. Time from invoice/application to cash. The best release funds within 24 hours.
Contract type. Whole-turnover vs selective (fund one debtor, not your whole ledger), and recourse vs non-recourse (who eats a bad debt).
Total cost. Service fee plus discount charge. Watch for minimum fees, audit fees, and CIS/contra handling costs that don’t show in the headline rate.

Best invoice factoring solutions for UK construction firms

Two models solve construction cash flow. Direct factoring — you borrow against your own receivables. Embedded invoice financing — a platform or contractor pays its suppliers instantly. Here’s how the leading options compare.

Provider	Model	Best for	Construction fit	Speed
Bibby Financial Services	Direct factoring	SME contractors & subcontractors	Specialist — funds against applications for payment	~24h
Close Brothers Invoice Finance	Factoring & discounting	Established SMEs	Strong; up to ~90% advance	24–48h
NatWest / RBS	Bank factoring	Bank customers wanting bad-debt protection	Good; dedicated sector experts	24–48h
HSBC Invoice Finance	Factoring & discounting	Firms with £250k+ turnover	Good; adds international factoring	24–48h
Kriya	Selective invoice finance	Firms wanting single-invoice funding	Flexible, no whole-ledger lock-in	24h
Aria	Embedded invoice financing	Construction platforms, ERPs & main contractors	Debtor-underwritten; funds the whole supplier long tail	24h

Terms, advance rates, and eligibility change — always confirm current pricing directly with each provider.

Bibby Financial Services — best construction specialist

Bibby is the UK’s largest independent invoice financier and runs a dedicated Construction Finance product. Its edge is construction-native underwriting: it advances cash against payment applications rather than waiting for full certification of works, with advance rates up to 100% and funds typically released within 24 hours of raising an invoice (Expert Market, Funding Bay). For most construction SMEs, this is the default starting point.

Close Brothers Invoice Finance — established SMEs

Close Brothers offers both factoring and confidential invoice discounting, advancing up to 90% of unpaid invoice value, backed by a large specialist team (Funding Bay). A solid choice for firms that want a well-resourced provider and are comfortable with slightly lower advance rates than a pure construction specialist.

NatWest / RBS and HSBC — the bank route

If you already bank with a major and want bad-debt protection or international coverage, the bank-owned facilities are worth a look. HSBC Invoice Finance serves businesses with £250,000+ turnover and adds international factoring and credit protection; NatWest/RBS pairs funding with dedicated industry experts (Wise). Expect more process and slower onboarding than independents.

Kriya — selective funding

Kriya offers selective invoice finance, so you can fund a single large invoice from one main contractor without pledging your whole ledger. Funds are released within 24 hours — useful when you want to cover one big payment gap rather than commit your entire sales ledger to a facility.

Aria — embedded invoice financing for construction platforms and contractors

Aria isn’t a traditional factor you sign up with as a single subcontractor. It’s embedded invoice financing infrastructure for the platforms, ERPs, and main contractors that sit above the supply chain — the layer that lets them pay their suppliers instantly.

The model is different in three ways that matter in construction:

Aria underwrites the debtor, not the supplier. When a two-person groundworks firm invoices a national main contractor, traditional finance checks the small firm and often rejects it. Aria checks the company that owes the money. That funds the long tail traditional factors reject.
Invoices are purchased outright, not lent against. If a buyer defaults, Aria absorbs it, resolves disputes, and handles collections. The platform carries zero credit risk on its balance sheet.
It’s embedded via API, not a redirect. Suppliers request payment inside the platform they already use — no separate application, no open-banking connectors. One invoice, sent by API.

Aria runs KYC/KYB and debtor-solvency checks across 100+ countries, reaches 92% instant decisioning, and pays out in 24 hours. UK proof: Manchester-based platform UrbanChain unlocked £11M in funding and cut vendor payment times to 15 hours while scaling revenue from £2.4M to £25M, and staffing platform Job&Talent went live in the UK in three weeks after consolidating 20+ factoring partners onto Aria.

If you’re a construction marketplace, a sector ERP, or a main contractor trying to stop losing subcontractors to slow payment, this is the model to evaluate.

Traditional factoring vs embedded invoice financing: which is right for you?

Choose by who you are.

You’re a construction firm financing your own receivables → use a direct factor. Start with Bibby for construction-specific underwriting; compare Close Brothers, Kriya, and your own bank on advance rate, retention handling, and total cost.

You’re a platform or contractor who wants your suppliers paid instantly → use embedded invoice financing. You extend fast payment to your whole supplier base without lending your own cash, without carrying credit risk, and without building underwriting infrastructure in-house.

The old way makes each subcontractor fight for financing alone, and leaves the smallest ones — often 80% of the invoice volume — with no option at all. The embedded way turns instant payment into a feature of the platform itself.

That’s the difference.

How does embedded invoice financing work in construction?

Four steps, no redirect:

Invoice created. A subcontractor raises an application or invoice inside your platform or ERP.
Debtor underwritten. Aria scores the main contractor or buyer who owes the money — solvency, KYC/KYB, fraud checks, invoice validation — with 92% instant decisioning.
Supplier paid. The supplier receives funds within 24 hours, in the currency and rail you need (SEPA, SWIFT, FPS), into a dedicated IBAN if required.
Aria collects. When the debtor pays on their normal terms, Aria reconciles automatically. If they default, Aria absorbs the loss and runs collections.

The platform keeps its extended payment terms. Suppliers get paid now. Nobody carries the risk in between.

FAQ

Can construction firms with retentions use invoice factoring?

Yes, but not every provider funds against retained sums. Construction specialists like Bibby advance against applications for payment; general factors often exclude retentions entirely. Confirm retention treatment before signing.

What advance rate can UK construction firms expect?

Construction-specialist facilities reach up to 100% of the invoice or application value; general facilities typically sit at 80–90%. The rate depends on debtor quality, contract type, and how you bill.

Is invoice factoring the same as invoice discounting?

No. With factoring, the provider manages collections (your customers know). With discounting, you keep collections in-house and it stays confidential. Discounting suits larger, well-run finance teams; factoring suits firms that also want the admin lifted.

How is Aria different from a factoring company?

Aria is embedded invoice financing infrastructure for platforms and contractors, not a direct-to-SME factor. It underwrites the debtor (not the supplier), purchases invoices outright so the platform carries no credit risk, and funds via API inside your existing product — reaching the small suppliers traditional factors reject.

How fast can construction firms get paid?

The best providers — Bibby, Kriya, and Aria — release funds within 24 hours. Bank-owned facilities can take 24–48 hours and longer to onboard.

Does factoring hurt relationships with main contractors?

With disclosed factoring, your customer is notified and pays the factor directly, which some contractors dislike. Confidential invoice discounting and embedded models avoid changing the payment relationship your customer sees.

About the author

Written by Aria’s editorial team and reviewed by Aria’s embedded-finance underwriting specialists, who build and operate invoice-based B2B payment flows — debtor-level underwriting, KYC/KYB, collections, and cross-border rails — inside marketplaces, SaaS platforms, and sector ERPs. Aria provides embedded invoice financing for B2B platforms across 100+ countries. Learn more at helloaria.eu.