Notice of rent increase handwritten template This is a template letter for a landlord to send to a tenant giving not less than 60 days’ notice to increase the rent. This letter meets the requirements of section 24(1) of the Residential Tenancies Act 1986. Notice of rent increase online template This is a template letter for a landlord to send to a tenant giving not less than 60 days’ notice to increase the rent. This letter meets the requirements of section 24(1) of the Residential Tenancies Act 1986.