G.O. Ms. No. 155, Amendments to the Tamil Nadu Combined Development and Building Rules, 2019
The Government of Tamil Nadu Housing and Urban Development Department issued G.O. Ms. No. 155 on 8th October 2025 to amend the Tamil Nadu Combined Development and Building Rules, 2019. The amendments define In-Building Solutions and Telecom Service Providers, and introduce requirements for telecom rooms, installation spaces, service plans and telecom utilities in certain buildings and plotted layouts.
What the amendments cover
G.O. Ms. No. 155 of the Housing and Urban Development Department adds telecom infrastructure requirements to the Tamil Nadu Combined Development and Building Rules, 2019. It inserts definitions for In-Building Solutions and Telecom Service Providers, and adds requirements for buildings and plotted developments.
In-Building Solutions means telecom infrastructure and associated equipment installed within a building to support high-speed data transmission, better signal coverage, reduced cell interference, adequate signal strength, optimum spectrum use and fewer call drops.
A Telecom Service Provider means an agency authorised by the Department of Telecommunications, Ministry of Communications, Government of India, to install, operate or maintain telecommunications or information technology services within a building.
Building requirements
The new requirements apply according to building floor area:
- For floor area above 750 square metres and up to 1,000 square metres, the listed telecom spaces are a shallow room measuring 0.6 metres by 2.6 metres and a walk-in room measuring 1.3 metres by 1.3 metres.
- For floor area above 1,000 square metres and up to 2,000 square metres, the telecom room must measure 3.0 metres by 2.4 metres.
- For floor area above 2,000 square metres, the telecom room must measure 3.0 metres by 3.4 metres.
- Where a development has more than one block, each block other than an amenity block must have provision corresponding to its floor area.
In-Building Solutions installation spaces must:
- Be protected from flooding.
- Be free from exposure to water, moisture, fumes, gases and dust.
- Have enough floor loading capacity for the equipment.
- Be located away from vibration sources that could dislocate or dislodge equipment.
For buildings with floor area above 2,000 square metres, the owner or applicant must submit a service plan with the required specifications, certified by a qualified telecom-networking consultant. The owner or applicant must also undertake that the infrastructure will be available for use by all Telecom Service Providers.
Plotted layout requirements
The Tamil Nadu Combined Development and Building Rules, 2019 now require telecom utility provision in layouts. Empty large-size Hume pipes or HDPE pipes, with a minimum diameter of 0.15 metres, must be laid along the outer edges of layout roads to accommodate telecom cables. Layout plans must clearly show the telecom utility infrastructure line.
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Common questions
Does every block in a multi-block development need telecom provision?
Each block, other than an amenity block, must have provision corresponding to the floor area specified in the amendments.
Do I need a certified telecom service plan for my building?
An owner or applicant must submit a service plan for a building with floor area above 2,000 square metres. The required specifications must be certified by a qualified telecom-networking consultant.
Can the In-Building Solutions infrastructure be restricted to one telecom provider?
The owner or applicant must give an undertaking that the infrastructure will be available for use by all Telecom Service Providers.
What telecom provision is required in a plotted layout?
Large-size Hume pipes or HDPE pipes with a minimum diameter of 0.15 metres must be laid along the outer edges of layout roads for telecom cables. The layout plan must clearly identify the telecom utility infrastructure line.
