Real Dictionary

in-house
adjective: In-house work or activities are done by employees of an organization or company, rather than by workers outside the organization or company.

in-house in American English
at or within an organization, company, etc. rather than outside it
originating within an organization, company, etc., rather than brought in from outside
within, conducted within, or utilizing an organization's own staff or resources rather than external or nonstaff facilities

in-house in British English
within an organization or group