Quick Answer:
No — for most visitors you don't. You need an International Driving Permit only if your driving licence is both not in English and not from Ireland, the EU or the EEA. Most visitors don't need one: a US, Canadian, Australian or New Zealand licence is in English, and EU, EEA and Irish licences are fine in any language.
12 Month Rule:
If your own licence is already valid, GOV.UK confirms no IDP is legally required to drive as a visitor in Great Britain for up to 12 months. Visitors to the UK can drive for up to 12 months with their full and valid license from their home country. Legal position as of 2026: visitors can often drive in Great Britain on a full, valid foreign license for up to 12 months from last entry.
US / English licences:
A US state-issued license is valid for driving in the UK for up to 12 months. No International Driving Permit is required, although some smaller rental companies may request one. An IDP is only necessary if your licence is not in English or is not easily readable.
London charges (this is what people Google):
London is not about IDP — it's about cameras. Congestion Charge is £15/day in central London (Mon-Fri 07:00-18:00, Sat-Sun 12:00-18:00). ULEZ is £12.50/day for non-compliant cars. Most new rental cars from Heathrow, Gatwick, Luton are ULEZ compliant, but always check AutoPay is included by the hire company.
Hire tip + internal link:
Rental desks frequently ask for IDP if licence is not in English or unfamiliar even when UK law doesn't require it. Bring your original licence + IDP if you need one, and book via our cheap car hire London comparison for low-deposit deals with ULEZ-included cars.
