Mechanical Checklist

Required Documents to Be Submitted with Building Permit Application or Independent Auxiliary Permit Application

The following checklist contains the minimum information and details required on mechanical plans prior to submission for plan review. This is a basic pre-submittal checklist that is intended to expedite the plan review process by minimizing the number of required revisions. Please contact the commercial plan review staff at (804) 748-1057 with any questions regarding this checklist or any other commercial permit questions.

A mechanical permit is required for installation of HVAC systems, storage tanks, paint spray and powder coating booths, walk-in cooler/freezer, and kitchen hoods.

General Requirements

  • Construction documents prepared and sealed by a registered design professional for:
    • The following occupancy classifications: Institutional (I), Educational (E), High hazard (H), and per departmental policy all Assembly (A) occupancies that have an occupant load over 100
    • All buildings over 3 stories in height
    • Any building or occupancy using non-packaged equipment or packaged equipment exceeding 300°F (other than flue gases) and pressures greater than 125 pounds per square inch
  • Construction documents that are not required to be prepared by an RDP, prepared by a licensed master plumber or master mechanical worker, or a licensed Class A contractor with an associated plumbing or mechanical specialty designation
  • Name, occupation, address and telephone number of the person who prepared the plans
  • All pages of the plan set the same size. If different discipline designers use different page sizes, re-print the smaller pages on sheets the size of the largest in the set.
  • Mechanical plans on same sized sheets as rest of plans in building permit package
  • Mechanical code edition. The current code edition is the 2012 VMC (2012 IMC)
  • New work vs. existing work clearly distinguished
  • Equipment location, access, service space and guard rails as applicable
  • Each mechanical sheet with distinct sheet numbers (i.e. M1, M2, etc.)
  • A Boiler/Mechanical Permit is required prior to scheduling inspections


  • Any equipment options provided (economizer, duct heaters, CO2)
  • Duct sizes, location of all supplies, returns, exhaust, fresh air ducts, and duct smoke detectors
  • Equipment schedule (system type, cooling/heating capacity, blower rating)


  • Capacity of all exhaust fans; exhaust quantities added as outside air to ventilation
  • Occupant loads and amount of outside air in accordance with VMC Table 403.3

Penetrations of Fire- or Smoke-resistance Rated Assemblies

  • Location of any fire-resistance rated or smoke-resistant construction. Activation and control for smoke dampers
  • Penetration protection details for HVAC ducts or vents penetrating fire-resistance rated or smoke-resistant construction


  • Boiler: details to include safety controls and distribution piping layout
  • Combustion Air: combustion air sources for fuel-fired appliances and venting detail
  • Dryer exhaust systems: routing and developed length of dryer exhaust
  • Hazardous Exhaust System: engineered design for hazardous exhaust system
  • Smoke Management System: engineered design for smoke management system
  • Storage Tanks: tank contents, construction standards, piping materials and details
  • Kitchen Hoods:
    • All cooking and dishwashing equipment
    • Complete details for Type I and Type II kitchen hoods, clearances to combustibles and cooking equipment
    • Duct sizes, cleanout locations, and fire-resistance rated shafts where required
    • Exhaust fan/make-up air interlock, exhaust fan/gas supply interlock
    • Source and capacity of make-up air system
    • UL 710 listing criteria if applicable