Merko Ehitus Merko Ehitus is an Estonian construction company. is an Estonian construction company which is focusing on prime contracting and project management. The company is active in Baltic countries being one of the leading construction companies in these countries. Merko Ehitus Merko Ehitus is an Estonian construction company. also includes Merko Ehitus Merko Ehitus is an Estonian construction company. Eesti and its subsidiaries Tallinna Teede AS and Merko Infra AS.