law: Factories Act, 1948 
  6. Approval, licensing and registration of factories 
  (1) The State Government may make rules- 
   22  [(a) requiring, for the purposes of the
  
  Act, the submission of plans of any class or description of factories to the
  
  Chief Inspector or the State Government;]
   21[  ( aa )
  
  requiring the previous permission in writing of the State Government or the
  
  Chief Inspector to be obtained for the site on which the factory is to be
  
  situated and for the construction or extension of any factory or class or
  
  description of factories;
  (b) requiring for the purpose of considering
  
  applications for such permission the submission of plans and specifications;
  (c) prescribing the nature of such plans and
  
  specifications and by whom they shall be certified;
  (d) requiring the registration and licensing
  
  of factories or any class or description of factories, and prescribing the fees
  
  payable for such registration and licensing and for the renewal of licenses;
  (e) requiring that no license shall be granted
  
  or renewed unless the notice specified in section 7 has been given.
  (2) If on an application for permission referred to in 22[clause
  
  ( aa )] of sub-section (1) accompanied by the plans and
  
  specifications required by the rules made under clause (b) of that sub-section,
  
  sent to the State Government or Chief Inspectors by registered post, no order
  
  is communicated to the applicant within three months from the date on which it
  
  is so sent, the permission applied for in the said application shall be deemed
  
  to have been granted.
  (3) Where a State Government or a Chief Inspector refuses to
  
  grant permission to the site, construction or extension of a factory or to the
  
  registration and licensing of a factory, the applicant may within thirty days
  
  of the date of such refusal appeal to the Central Government if the decision
  
  appealed from was of the State Government and to the State Government in any
  
  other case.
   Explanation :  A factory shall not be deemed to be extended
  
  within the meaning of this section by reason only of the replacement of any
  
  plant or machinery, or within such limits as may be prescribed, of the addition
  
  of any plant or machinery 7[if such replacement or addition does not
  
  reduce the minimum clear space required for safe working around the plant or
  
  machinery or adversely affect the environmental conditions from the evolution
  
  or emission of steam, heat or dust or fumes injurious to health.]