
in Eigenregie
independently
To carry out or organize something independently and without outside professional help.
Wir haben den Umbau des Hauses komplett in Eigenregie gemacht.
We did the house renovation completely on our own.
self-direction
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independently
To carry out or organize something independently and without outside professional help.
Wir haben den Umbau des Hauses komplett in Eigenregie gemacht.
We did the house renovation completely on our own.
The word consists of 'eigen' (own) and 'die Regie' (direction). You may know 'Regie' from theater or film, where it means 'direction' or 'management'. So 'Eigenregie' literally means 'under one’s own direction'.
Die Party wurde in Eigenregie organisiert, ohne professionelle Planer.
The party was organized independently, without professional planners.
This word is used almost exclusively in the fixed expression 'in Eigenregie' (independently / on one’s own). It describes doing something yourself, usually without hiring professional help.
Sie hat ihre Hochzeit komplett in Eigenregie geplant.
She planned her wedding completely on her own.
The phrase 'in Eigenregie' (independently / on one’s own) is often used for projects for which one might normally hire experts. Typical examples are building a house, renovating an apartment, or organizing a move.
Viele Leute renovieren ihre Küche in Eigenregie, um Geld zu sparen.
Many people renovate their kitchen on their own to save money.
solo action / going alone
Both words describe acting independently. Eigenregie emphasizes organizing or carrying something out oneself without professional help, while Alleingang additionally suggests that others were not consulted or involved and often has a critical tone. Use Eigenregie for carrying something out independently and Alleingang when there was a lack of coordination.

Sie organisierte die Renovierung in Eigenregie und brauchte dafür keine professionelle Hilfe.
She organized the renovation independently and did not need any professional help.
Sein Alleingang bei der Planung überraschte das Team, weil er niemanden vorher gefragt hatte.
His solo action in planning the project surprised the team because he had not asked anyone beforehand.