Code Compliance Pressure Testing

The Virginia Energy Code establishes maximum thresholds for the air-tightness of homes and ductwork. New homes must exhibit no more than 5 air exchanges per hour during a blower door test. Ductwork must leak no more than 6%.

A HERS Rater since 2007, CSW’s Andrew Grigsby is a qualified third-party contractor for performing the blower door and duct leakage tests.* Our experience testing hundreds of homes indicates that only a mechanical test can prove code compliance and provide builders and homebuyers with the assurance of a job done right.

Everybody wins when there are actual measurements of house and duct performance: inspectors get legally defensible numbers, builders get tangible feedback on their subs’ performance, and homebuyers get the comfort and energy savings they deserve.

Prices are printed below. A travel fee may apply for work outside of the Richmond area. Test results are available immediately.

Blower Door Testing: $165 – a measure of the unintendedblowerdoor infiltration (draftiness) of a dwelling unit

  • Test is administered when building is ready for final inspections; interior fixtures and trim are in place; air-sealing around all penetrations in drywall is complete.
  • Builder must provide Manual J.
  • Add $.05 per square foot of conditioned floor area in excess of 5000.
  • Results documented in fan flow (CFM50) and air exchanges/hour (ACH50)

Duct Leakage Testing: $165+ – These tests measure the amount of conditioned air that escapes an HVAC system from points other than the supply and return registers. Total duct leakage is that volume of air escaping the system, regardless of where it goes. Leakage to outside is the subset of total leakage that finds its way to the building’s exterior.


  • For homes with more than one ductwork/air handler system, add $50 per system.
  • Add $.05 per square foot of conditioned floor area in excess of 2500.
  • Builder must provide Manual J.
  • If air handlers are not set, add $25 per system.
  • Results documented in fan flow (CFM25) and percent leakage

Rough-in total leakage test:

  • Occurs before home is insulated.
  • Boots in floors should be sealed to adjacent subfloor material.

Final total leakage and leakage to outside tests:

  • Occurs when building is ready for final inspections: supply and return boots are sealed to adjacent drywall/subfloor; all grilles are installed; all heating/cooling duct-integrated ventilation systems are active.
  • Occurs in conjunction with blower door test (separately billed).


*Virginia Residential Building Energy Analyst License: 2722000045

*RESNET Home Energy Rater Certification: HERS1998-057

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