The Tamil Nadu government has initiated the CMDA expansion that will enlarge the Chennai Metropolitan Area from 1,189 sq km to 5,904 sq km, bringing Arakkonam taluk in Ranipet district and several areas in neighbouring districts under the metropolitan planning framework.
The expansion will extend the jurisdiction of the Chennai Metropolitan Development Authority across parts of Chengalpattu, Kancheepuram and Tiruvallur districts, in addition to Arakkonam. The move will create a common planning area covering a much larger urban region around Chennai.
The Tamil Nadu government approved the expansion of the Chennai Metropolitan Area in 2024. Following that decision, the CMDA decided to include the newly added areas in the third Master Plan, which will guide development in the metropolitan region for the next 20 years.
The third Master Plan was initially being prepared for the existing 1,189 sq km area. With the boundary expansion, officials have been directed to incorporate the additional territory into the planning exercise. Additional funds will also be allocated for the work, according to the report.
The Master Plan process began in 2022, and public feedback was sought as part of its preparation. More than 40,000 responses were received, while draft reports are being prepared on 26 subjects, according to a Daily Thanthi report cited in the source coverage.
The inclusion of Arakkonam will place the taluk within the planned development framework of the Chennai Metropolitan Area. This means that its future growth will be considered alongside the wider metropolitan region rather than through a separate local planning approach.
The expanded boundary also brings a larger set of administrative and infrastructure coordination requirements for the CMDA. The authority will now have to account for development patterns, land-use requirements and growth pressures across areas that extend well beyond the existing metropolitan core. The source report did not provide details of specific infrastructure projects, implementation deadlines or the final boundaries of individual zones.
The decision comes as the third Master Plan is already under preparation. Its inclusion of the expanded areas means that the planning document will cover both Chennai’s established urban areas and its peripheral settlements. The plan is expected to remain the principal framework for guiding development over the next two decades.
Officials have been instructed to coordinate the revised planning work, with additional funding to support the exercise. The next formal milestones will include the preparation of the expanded Master Plan documents and the continuing process of public and administrative review.
