Construction Firm looking for admin staff with exp in UK Resi Construction

My company is growing and I am struggling with the following tasks as I am doing most of if not all of them myself:-

Procuring and cultivating new clients
Managing existing clients projects
Managing builders and trades people
Updating payment sheets
Procuring materials
Managing day to day admin of the business - insurances, accounts.
Keeping up with client messages on my whatsapps and emails.
Keeping up with new clients via various methods of marketing.