Letting Agent's fee near ST1

Letting agents fees in ST1 vary depending on the services and rent. 
The average rent per month in ST1 is £674. So a tenant finders fee for 60% of rent is £404. 
In ST1 a full managment fee for a property is between 10% and 20% of the monthly rental value, averaging between £40 and £81.
Renewal fees in ST1 are charged for renewing a tenancy agreement between the landlord and the tenant, ranging between £20 to £61.