Letting Agent's fee near DE4

Letting agents fees in DE4 vary depending on the services and rent. 
The average rent per month in DE4 is £1,119. So a tenant finders fee for 60% of rent is £671. 
In DE4 a full managment fee for a property is between 10% and 20% of the monthly rental value, averaging between £67 and £134.
Renewal fees in DE4 are charged for renewing a tenancy agreement between the landlord and the tenant, ranging between £34 to £101.