Letting Agent's fee near B18

Letting agents fees in B18 vary depending on the services and rent. 
The average rent per month in B18 is £1,121. So a tenant finders fee for 60% of rent is £673. 
In B18 a full managment fee for a property is between 10% and 20% of the monthly rental value, averaging between £67 and £135.
Renewal fees in B18 are charged for renewing a tenancy agreement between the landlord and the tenant, ranging between £34 to £101.