Ask an interpreting agency what a phone interpreter costs and the honest answer is "it depends" - on the language, the notice, the minimum charge and the contract you signed. This article puts the real numbers side by side: what traditional agencies charge, where the extra fees hide, and what the AI alternative costs - so you can price a year of language cover for your business on the back of an envelope.
The three ways UK businesses pay for interpreting
Strip the market back and there are three models. Face-to-face agency bookings: an interpreter attends in person, typically £30 to £60 an hour depending on language and region, with travel costs and minimum session lengths on top, booked days in advance. Telephone interpreting agencies: you ring a number (usually with an account code), an operator connects an interpreter, and the meter runs at roughly 50p to £1.50 per minute depending on how common the language is. AI interpreter lines: a dedicated number answers in seconds with all languages ready, on a monthly plan or a one-off session.
Where agency bills grow after the quote
The per-minute rate is rarely the whole story. Watch for:
- Minimum call charges. A 5 or 10 minute minimum is standard - so a two-minute "can you confirm the appointment" call is billed as ten.
- Language premiums. Polish might be at the bottom of the rate card; a rarer language can cost three times as much for the same conversation.
- Travel and call-out fees on face-to-face work - sometimes charged door to door, which in practice can double a one-hour booking.
- Cancellation fees. Customer doesn't show? Many agencies charge 50 to 100 per cent inside 24 to 48 hours.
- Account minimums and setup. Some contracts carry monthly minimum spends that quietly turn a per-minute rate into a standing charge.
What an AI interpreter line costs
A Phone Interpreter line runs on published flat pricing: £19 a month for a dedicated number with 40 interpreting minutes, £49 for 150 minutes, £99 for 400 - every plan with all 30+ languages, no contract and no minimum call length. A two-minute call uses two minutes. If you just want to test it, an instant session is £4.99 for 5 minutes with no account at all.
The reason the numbers are so different is structural, not clever pricing: there is no interpreter travel, no booking desk, no operator relay and no per-language premium. The same economics are why the line can answer at 3am on a Sunday for the same price as Tuesday lunchtime.
When the expensive option is the right one
Cost is not the only axis. Court hearings, police interviews, formal medical consent, safeguarding assessments and other evidential settings require qualified, certified human interpreters - there the higher cost is simply the price of the conversation being valid, and no AI line should be used instead. For the everyday commercial conversations that make up the vast majority of what a UK business actually needs - quotes, bookings, appointments, prices, directions - paying agency rates is paying for capability the situation does not require.
Price it against your own phone traffic
A dedicated interpreter number with 30+ languages from £19 a month - or test the quality first for £4.99.
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