Industrial approvals, licences, NOCs and continuing requirements across the project lifecycle: before construction, during construction, commissioning and ongoing compliance.
Start with the Single Window, choose your project stage, then open the principal pathways that may apply. What is required depends on the site, activity, process, building and workforce. Use this page to orient the pathway; applicability must be assessed for the individual facility. For a new project or expansion, our Regulatory Mapping service does that assessment.
Start here
The Tamil Nadu Single Window Portal provides a common application route for many State-level business clearances. It helps coordinate applications across participating departments, but it does not replace the underlying statutory approval. Each licence, consent, NOC or permission continues to be decided by the competent authority under its applicable law and procedure.
Single Window is a facilitation mechanism, not a separate substitute approval.
Project stage
Choose a stage to narrow the pathways. You do not need the legal terminology first.
Principal pathways
These are the main regulatory pathways industrial projects usually meet. Open a pathway to see the published requirements for the stage you selected. Order below is for navigation only; actual sequence depends on the project.
Pre-construction
A proposed project, expansion or change may need screening against the environmental-clearance schedule. EC does not apply to every factory.
Pre-construction
Where the environmental-clearance process requires scoping or Terms of Reference before appraisal.
Pre-construction
Projects and activities covered by the environmental-clearance schedule before regulated commencement. Category and competent authority depend on the notification, not on project preference.
During construction · Post-construction · Continuing
Where an environmental clearance has been granted, the clearance conditions and any monitoring or reporting attached to that clearance continue to apply.
Pre-construction
Confirm the site's planning zone, land classification and local planning jurisdiction before relying on a particular approval route.
Pre-construction
Where the local planning framework requires layout or subdivision approval for the proposed development.
Pre-construction
Development requiring planning permission from the competent planning authority for the site (DTCP, CMDA or other local planning body, as applicable).
Pre-construction
Construction requiring a building permit or building permission under the applicable local building rules.
Pre-construction · During construction · Continuing
Where an existing planning or building approval needs revision, revalidation or extension under the applicable order and current rules.
Pre-construction
Premises to be used as a factory, before you build, extend or install new plant.
During construction · Post-construction
A new or extended factory building, before manufacturing starts in it.
Pre-construction
Screen the process, emissions and discharges against the current TNPCB consent categorisation before deciding which consent route applies.
Pre-construction
Establishment or covered expansion of an activity that requires consent to establish under the Water Act and/or Air Act, as applicable.
Pre-construction · During construction
Where an existing consent to establish needs extension or amendment because of validity or a material project change.
During construction · Post-construction · Continuing
Waste generators covered by the Solid Waste Management Rules, 2026 must segregate waste at source and hand it over to the authorised channel.
During construction
Anyone generating construction and demolition waste covered by the Environment (Construction and Demolition) Waste Management Rules, 2025 must segregate and transfer waste as those Rules require. Not every generator is a defined EPR producer.
Pre-construction · During construction
Occupier or person in charge of a project with built-up area of at least 20,000 square metres, as defined for producer registration under the 2025 Rules.
Pre-construction · During construction
Defined producers under the 2025 Rules must prepare the waste management plan and meet the extended-producer responsibilities those Rules impose. Specific recycling targets are schedule- and year-dependent and must be read from the current Rules.
Pre-construction
Fire-safety design review or NOC may be required depending on the building, occupancy, height, activity and the applicable fire-safety procedure. It is not automatic for every industrial building.
Pre-construction
Where the building falls within the multi-storeyed or other category for which the fire authority requires design-stage clearance under the current procedure.
Pre-construction · During construction
Electrical installations that fall within the Electrical Inspectorate's approval jurisdiction and require drawing approval before installation.
During construction · Post-construction · Continuing
Material alteration of a previously approved electrical installation may require fresh drawing approval.
Pre-construction · Post-construction · Continuing
Storage of petroleum that requires a PESO licence. The applicable licence depends on the substance, storage mode, quantity, premises and permitted use.
Pre-construction · Post-construction · Continuing
Fixed petroleum dispensing installations that require a PESO licence.
Pre-construction · Post-construction · Continuing
Covered bulk petroleum storage installations or tank farms requiring a PESO licence.
Pre-construction · Post-construction · Continuing
Storage of applicable compressed or liquefied gases in unfired pressure vessels where an SMPV(U) licence is required.
Pre-construction · Post-construction · Continuing
Filling or storage of gas cylinders where a PESO licence is required under the Gas Cylinders Rules as amended.
Pre-construction · Post-construction · Continuing
Manufacture, possession or storage of explosives where a licence is required. Form and authority depend on the substance and activity.
Pre-construction
Decide whether a steam vessel or boiler component falls within the Boilers Act, 2025 definitions and exclusions before treating later boiler approvals as applicable.
Pre-construction · During construction
Construction or manufacture of a regulated boiler or regulated components where design or manufacture approval is required.
During construction · Post-construction
New boiler installation requiring prescribed drawings, documentation or tests before registration or use certification.
During construction · Post-construction · Continuing
Covered repair or alteration affecting regulated pressure parts may require approval and inspection before recommissioning.
During construction · Post-construction · Continuing
Identify which Labour Code duties and which competent government apply to the establishment, workforce and activities. Central rules are not automatically Tamil Nadu procedure.
Examples: Forest interfaces; Coastal Regulation Zone; Hill Area Conservation; Protected monuments / ASI; Airport height clearance; Railway or metro interfaces; Transmission-line interfaces; Mining and minerals
Pre-construction · Continuing
Where the project sits in an industrial estate or SIPCOT/similar estate and allotment, transfer or estate permission is required by the estate authority.
Examples: District Collector permissions; Local trade or activity licences; Dangerous/offensive trade permissions where applicable; Public-health permissions; Police/local safety permissions
Pre-construction · Post-construction · Continuing
Where the village panchayat requires an industrial or local trade licence for the activity.
Pre-construction · Post-construction
Where the local body or public-health authority requires a sanitation or public-health NOC for the activity.
Examples: Electricity connection or load alteration; Water and sewer connection; Groundwater extraction; Road cutting; Utility crossings; Rooftop-solar interconnection
During construction
Temporary electricity connection for construction where required from the distribution licensee.
Pre-construction · Post-construction
New high-tension electricity connection where the load and premises require HT supply.
Pre-construction · Post-construction
Industrial water-supply connection from the competent local or industrial water authority, where required.
Pre-construction · During construction
Where road access, culvert or road-cutting permission is required from the competent highways or local authority.
Examples: BOCW-related requirements where currently applicable; Temporary electricity; Construction and demolition waste; Construction-stage inspections; Road-access permissions
During construction
Construction-stage controls on materials, debris and dust where imposed by planning permission, consent conditions or local directions.
Examples: Food; Drugs and cosmetics; Insecticides; Legal metrology; Mandatory BIS certification; Excise; Controlled substances; Import/export controls
Pre-construction · Post-construction · Continuing
Manufacture of drugs or cosmetics requiring a manufacturing licence under the applicable drugs and cosmetics framework.
Pre-construction · Post-construction · Continuing
Manufacture or import of a product that is under mandatory BIS certification, CRS or certificate of conformity.
Examples: GST; Udyam; Importer-Exporter Code; Industrial incentives
Items marked Optional are registrations or schemes, not mandatory statutory approvals.
Pre-construction · During construction · Post-construction · Continuing
Optional common application channel for participating State clearances. Not a separate statutory approval.
Pre-construction · Post-construction · Continuing
Optional registration for eligible micro, small or medium enterprises. Udyam is not a substitute for statutory industrial approvals.
Pre-construction · Post-construction · Continuing
Optional investment-incentive or export-promotion capital-goods scheme election where the enterprise chooses to apply. Not a mandatory statutory approval.
AequiRadix maps the approvals, licences, NOCs and continuing obligations applicable to a proposed project, expansion or operating facility, before avoidable regulatory dependencies become project delays.
