Late rent and lost key charges
Default fees are only allowed if they are written into the tenancy agreement. Lost keys or fobs: reasonable costs with written evidence. Late rent: interest only once rent is at least 14 days late, at no more than 3% above the Bank of England base rate, on the amount owed for the time it's owed.
Source: GOV.UK: Tenant Fees Act 2019 guidance for tenants. Checked 18/10/2026.
Check your contract against this
Legal information, not legal advice. For your own situation, Shelter (england.shelter.org.uk) and Citizens Advice (citizensadvice.org.uk) give free advice.