House Business ERD defines a normalized relational schema for a service business with owner-managed employees, customers, and billing records. Owner records reference Employees and Customers; Customers link to Bills, which contain line-item details via Items. This design enforces referential integrity across the operational hierarchy, eliminating data redundancy and supporting accurate billing and payroll workflows. Fork and customize this ERD template on Diagrams.so to fit your business logic, then export as SQL DDL or adapt for your database platform. The schema demonstrates third-normal form principles ideal for businesses requiring audit trails and multi-customer billing.