From this period in Estonia, a palace on Kohtu street 8 in Tallinn survives (today housing the Estonian Chancellor of Justice) and, possibly, Kernu manor.
From 1814 to 1815, he worked for a businessman in Turku, Finland, where he came in contact with Johan Albrecht Ehrenström, who led the project of rebuilding Helsinki.
Ehrenström was searching for a talented architect to work by his side and this meeting proved to be decisive for Carl Ludvig Engel's future career.
In 1819–1820, when Engel's first creations were nearing completion, his status as a kind of head architect of the Grand Duchy was established when he received more and more building assignments, both private and public, in other parts of Finland.
The final confirmation came when he in 1824 was appointed head of the statewide Intendant's Office, responsible for all key state buildings throughout the country,[3] a position he was offered - but first declined because he still had hopes of returning to Prussia - following the resignation of its first head, the Italian-born architect Carlo Bassi, and which he retained until his death.