Administrative &
Public Law.
Environmental Law,
Spatial Planning,
Investment Projects.
A law firm based in Kolonaki (Athens), specializing in Administrative and Public Law, Environmental Law, Spatial and Urban Planning, licensing and permitting, investment projects, and sustainability.
Areas of Expertise
Five practice areas. One integrated approach.
DTK Law Firm provides specialized legal counsel across Administrative and Public Law, Environmental Law, Spatial and Urban Planning, and Investment Law, ensuring that every project is delivered on a solid legal and regulatory foundation.
Spatial Planning – Urban Planning – Environmental Law
DTK Law Firm provides comprehensive legal support on matters relating to spatial and urban planning, land-use planning and zoning, as well as environmental permitting for development projects. Our practice includes assessing compliance with the applicable national and EU regulatory framework, evaluating alignment with relevant case law, and applying the principles of sustainable development to ensure the legally secure implementation of every project.
Building Permits & Regulatory Framework
DTK Law Firm provides specialized legal services in relation to the regulatory framework governing building permits and all related approvals throughout every stage of the permitting process. Our services include reviewing the legality and completeness of application files, interpreting and applying planning and building regulations, advising on unauthorized constructions, and representing clients in administrative disputes. Our objective is to ensure full regulatory compliance and mitigate legal risks that may affect the successful delivery of a project.
Investments – Tourism Developments – Strategic Investments
DTK Law Firm advises on complex investment projects, including tourism developments, strategic investments, and public investment initiatives. Our approach focuses on strategic planning, regulatory risk management, and ensuring the smooth, legally compliant execution of projects from planning through implementation.
Sustainability / ESG
DTK Law Firm advises sponsors and stakeholders of major investment projects on the integration of sustainability and ESG principles in line with the evolving European and international regulatory framework. In particular, the Firm prepares Legal Sustainability and Compliance Reports, assessing regulatory obligations, addressing environmental and social considerations, and strengthening transparency and governance. We view sustainability as a strategic pillar that enhances regulatory resilience, supports responsible investment, and contributes to the long-term stability and success of every project.
Specialized Legal Research & Policy Analysis
DTK Law Firm offers specialized expertise in legal and regulatory research, with a particular focus on cross-border and comparative law matters. Our approach combines in-depth analysis of national, European, and international legal and regulatory frameworks with comprehensive research into case law and public policy developments. This evidence-based methodology supports strategic planning, legal analysis, and informed decision-making in complex regulatory and investment environments.
THE FIRM
DTK LAW FIRM
K. Karatsolis – E. Tsianti & Associates Law Firm (DTK Law Firm) was established in 2016 and is based in Kolonaki (Athens). The Firm has been recognized as one of the leading law firms in the fields of Administrative and Public Law, with particular expertise in Environmental Law, Spatial and Urban Planning Law, administrative permitting procedures, and the issuance of building permits.
Scope of Services & Legal Support
Its practice extends to the structuring and implementation of investments, tourism developments, strategic investments, and public investment projects, incorporating principles of sustainable development and ESG criteria.
The Firm provides comprehensive advisory and litigation services throughout the entire lifecycle of a project — from legal structuring and regulatory risk assessment to representation before the competent administrative authorities and the highest national courts, including the Council of State.
Legal Research & Documentation
At the same time, DTK Law Firm conducts specialized legal and policy research with a cross-border and comparative orientation, strengthening institutional substantiation and the strategic handling of complex regulatory matters.
The Team
The DTK Law Firm team consists of experienced legal professionals with advanced academic background and specialized expertise in both national and European Union law, systematically monitoring legislative, regulatory, and case law developments affecting investment planning and the public interest. The continuously evolving institutional framework and the increasing complexity of regulatory requirements necessitate specialized legal expertise and a strategic approach. The Firm’s in-depth knowledge of the applicable regulatory framework, combined with its extensive experience in handling complex administrative and investment matters, ensures the lawful, timely, and effective implementation of projects.
Our Approach
DTK Law Firm’s comparative advantage lies in its holistic approach to each matter, its structured analysis of the applicable regulatory framework and relevant case law, as well as its targeted strategic guidance in the administrative and judicial management of critical issues. The Firm delivers practical, well-substantiated, and institutionally robust solutions, fully aligned with the business and investment objectives of its clients.
Explore
Learn More About Us
SELECTED PUBLICATIONS
Explore Our Publications
How legislation protects Greece’s beaches and the seashore
AUTHORS Konstantinos Karatsolis, Marianna Xafougianni, Eleftheria Volaki, Eirini Tsianti, Ifigeneia Tsakalogianni DATE JULY 2026 PRODUCED BY 1830 lab PAGES32 DOWNLOAD What Applies under the Law—and […]
10 things about coastal management that many of us don’t know
AUTHORS Konstantinos Karatsolis, Marianna Xafougianni, Eleftheria Volaki, Eirini Tsianti, Ifigeneia Tsakalogianni PRODUCED BY 1830 lab PAGES 32 DOWNLOAD Handbook developed on the basis of the […]
The Legal Framework for the Development, Management and Protection of Coastal Areas, the Seashore and the Beach: Recent Reforms under Laws 5092/2024 (GG A’33) and 5313/2026 (GG A’ 102)
AUTHORS Konstantinos Karatsolis, Marianna Xafougianni, Eleftheria Volaki, Eirini Tsianti, Ifigeneia Tsakalogianni PAGES 60 DOWNLOAD Konstantinos Karatsolis, Attorney-at-Law, Environmental and Urban Planning Law, PhD Marianna Xafougianni, […]
Urban Redevelopment and Environmental Protection in the International Context
Code21153 AuthorsZoi. , Karatsolis K., Tsakalogianni I. Edition2025 Format14 × 24 cm Pages128 ISBN978-618-08-0594-9 DISTRIBUTION: NOMIKI BIBLIOTHIKI Description How can an urban planning instrument contribute […]