Yes — if you're a small trades business with tight cash flow, pay on completion leads are usually worth it, provided the platform clearly defines what "completion" means and holds funds in genuine escrow rather than just marketing itself as "risk-free." Not every provider using this language actually operates this way, though. The mechanics matter far more than the pitch.
What "Pay on Completion" Actually Means (And Why Most Providers Blur It)
Here's the confusion: half the lead gen market in the UK slaps "pay on performance" on their homepage, but what they actually mean is "pay per lead, and we think our leads perform well." That's marketing, not a payment structure.
A true pay on completion model works more like a solicitor's client account. The buyer's money sits in escrow — held by the platform, not yet paid to the lead seller — until a defined success event happens. On Referr's model, for example, funds are only released once success criteria are met, and the platform takes a reduced 15% fee rather than charging per enquiry regardless of outcome.
Compare that with a standard pay-per-lead arrangement: you're charged the moment an enquiry lands, whether or not it turns into a customer, a quote, or a no-show. There's no retainer and no setup fee, which is genuinely flexible — but the risk of a dead lead sits entirely with you.
Then there's the monthly retainer model, common with SEO and web design agencies, where you pay a fixed fee for ongoing marketing activity regardless of how many leads (if any) that activity produces this month.
This isn't a semantic distinction. It decides who carries the financial risk when a lead goes cold.
The Cash Flow Maths: Why This Matters More in the UK Right Now
This is the part most lead gen pages skip entirely, and it's the strongest argument for pay-on-completion models.
According to Coface's 2025 UK Payment Survey, the average payment delay across UK companies now stands at 32 days. That's not a rounding error — that's over a month of cash tied up before you get paid for work you've already done. Worse, the pain isn't evenly spread: nearly 50% of micro and small enterprises reported more frequent late payments, compared to 39% of mid-sized firms and 42% of large companies. Small trades businesses are getting squeezed hardest.
Now stack a pay-per-lead cost on top of that. If you're a plasterer paying £20-£29 per lead upfront (roughly the range implied by credit-based platforms like the one covered on Build Partner, where 180 credits for £230.40 stretches to 8-10 leads), you're spending money today for a job you might not get paid for until 32+ days after completion. Two or three dead leads in a slow week and you've got a real cash flow problem, not just a marketing inefficiency.
Pay on completion flips that order. You're not funding speculative enquiries; you're paying a fee only once the job (or defined milestone) has actually happened. For a sole trader or a two-van business, that's the difference between smooth cash flow and constantly chasing your tail.
Pay on Completion vs Pay-Per-Lead vs Retainer: A Head-to-Head
Here's how the three main models stack up for a typical UK trades business:
| Model | When you pay | Cash flow risk | Typical UK cost |
|---|---|---|---|
| Pay on completion | After success criteria met | Low — money in escrow until job converts | 15% fee on completed value (Referr) |
| Pay-per-lead | On enquiry, regardless of outcome | High — no guarantee of conversion | £15-£29 per lead depending on platform |
| Real-time auction | On winning the bid | Medium — you choose which leads to chase | £50-£100 per lead (roofing) |
| Monthly retainer | Fixed monthly fee | High — pay even in quiet months | Varies, often £500+/month |
| Telemarketing | Per hour/day of calling | Medium — pay for effort, not outcome | Day-rate or hourly, agency-set |
Construction is the UK's largest SME sector by a wide margin — 867,574 businesses, or 15.9% of all UK SMEs, according to Airwallex's small business statistics — which is exactly why so many lead models compete for trades spend. But "largest sector" doesn't mean "one-size-fits-all pricing."
Real-time auction platforms, like the roofing-focused model run by Hammer Down Leads, suit trades where jobs are high-value and time-sensitive — you bid £50-£100 for a lead you're confident you can convert, and you only pay if you win the bid. That works well for roofers and larger renovation jobs where margins comfortably absorb a higher per-lead cost.
Telemarketing-per-hour suits a different profile entirely — typically B2B services like accountants or mortgage brokers, where agencies argue that paying for calling time (not per lead) gives better-qualified conversations and more control over messaging, even if it costs more in aggregate.
Pay on completion suits businesses where job value is clear-cut and completion is easy to define — extensions, installations, servicing jobs, mechanics' repairs — because the "did this convert" question has an obvious yes/no answer.
The Hidden Catch: When "Zero Risk" Isn't Actually Zero Risk
Not every "pay on performance" claim survives scrutiny. Three things to check before you sign up:
Vague success criteria. If a platform can't tell you in one sentence what triggers payment release — job booked, deposit paid, work completed and signed off — that's a red flag. Ambiguity benefits the platform, not you.
Inconsistent pricing hidden in credits. Credit-based systems are a common workaround here, and they're often opaque. One example from Build Partner's roundup shows a 30m² extension listing costing 12 credits in one instance and 18 in another — for comparable jobs. That's a 50% price swing with no clear explanation, and it makes budgeting genuinely difficult for a small business trying to plan ahead.
Higher fees dressed as "no risk." Some pay-on-performance platforms charge a much higher percentage than 15% specifically because they're absorbing the non-conversion risk — which is fair in principle, but only if it's disclosed upfront. Ask for the fee percentage in writing before you commit, not after your first completed job.
The Seller's Side: Is Pay on Completion Fair for Lead Suppliers Too?
Most coverage of pay-on-completion models only looks at the buyer's side — understandably, since that's who's spending the money. But if you're selling leads into a marketplace, the calculation is different.
Escrow-based models mean slower payment for sellers — you wait for the job to complete rather than getting paid the moment a lead is generated. That's a genuine trade-off against faster pay-per-lead payouts, where sellers get paid on delivery regardless of what happens next.
The upside for sellers: platforms with a completion-based structure tend to attract buyers who are more committed, because they're only paying for leads that actually convert. That usually means better close rates and less time wasted on tyre-kickers, which can offset the slower payment cycle if your leads are genuinely strong. If you're supplying leads and considering a marketplace switch, ask how quickly funds release after completion is confirmed — some platforms process this within days, others take much longer.
A Buyer's Checklist Before You Sign Up
Before committing to any pay-on-completion platform, get clear answers to these:
- What exactly counts as "completion"? Job booked, deposit taken, or work finished and invoiced?
- Who holds the escrow funds, and for how long, before release or refund?
- What's the dispute process if you believe a lead didn't genuinely convert but the platform disagrees?
- What's the total fee percentage, and does it change based on job value or trade category?
- Is there a minimum job value below which pay-on-completion doesn't apply?
- How does this compare to your current pay-per-lead cost per converted job — not per enquiry, but per actual customer won?
That last point is the one most tradespeople skip. A £20 lead sounds cheaper than a 15% completion fee — until you calculate that you're converting one in five leads, meaning your real cost per customer is £100, not £20.
Frequently Asked Questions
How is "completion" defined in a pay on completion lead model?
It depends on the platform, but the strongest models define completion as a clear, verifiable event — such as the job being booked, deposit paid, or work finished and confirmed by the customer. Always get this definition in writing before signing up, since vague criteria benefit the platform more than the buyer.
Are pay on completion leads more expensive than pay-per-lead?
Not necessarily — a 15% fee on a completed job is often cheaper than paying £20-£29 upfront per lead when you factor in typical conversion rates, since pay-per-lead costs apply whether or not the enquiry turns into paying work. The real comparison is cost per converted customer, not cost per enquiry.
Do pay on completion platforms work for every trade?
They suit trades with clear-cut, definable jobs like extensions, installations, and repairs particularly well. Trades with longer sales cycles or harder-to-define outcomes, such as some B2B services, may be better served by telemarketing-per-hour or retainer models instead.
Why are UK late payments relevant to choosing a lead model?
With average UK payment delays sitting at 32 days and nearly half of micro and small enterprises reporting more frequent delays according to Coface's 2025 survey, paying upfront for speculative leads adds extra cash flow strain on top of an already difficult payment environment. Pay-on-completion models align your lead spend with when you're actually earning.
Is a 15% fee a good deal compared to credit-based lead systems?
For many trades jobs, yes — credit-based systems can be inconsistent, with similar jobs sometimes costing very different credit amounts, making true cost hard to predict. A flat, transparent percentage fee taken only on completed work is generally easier to budget against.
If you're weighing up lead models, run the numbers on cost-per-converted-customer, not just cost-per-lead — and don't sign up to anything calling itself "pay on performance" until you've got the completion criteria and fee percentage in writing.