Which Tests Does Keystone Provide?Keystone provides independent blower door and duct leakage tests for new residential construction, along with measured results and formal documentation for the local construction office.Which New Jersey energy code applies to my project: the 2021 or 2024 IECC?New Jersey adopted the 2024 IECC on August 17, 2026. During the six-month grace period, a complete permit application may be submitted for review under the previously adopted 2021 IECC. The permit application date, approved plans, and code edition identified in the permit documents determine which requirements apply to the project. Confirm the approved code edition before scheduling a test.

Current New Jersey Construction Codes

Previous Codes and Grace Period Information

Are blower door and duct leakage tests required in New Jersey if the municipal construction office does not request them?Yes. If the applicable code requires a blower door test or duct leakage test, the requirement does not disappear because the municipal construction office does not request the test or report. These are statewide code requirements, not optional municipal policies. The permit date, approved plans, code edition, compliance path, and project type determine which tests are required.View the NJ DCA Mechanical Energy MatrixCan a builder face code enforcement after a certificate of occupancy or home sale?

Yes. In DKM Residential Properties Corp. v. Township of Montgomery, the New Jersey Supreme Court held that a municipal construction official could cite a developer for Uniform Construction Code violations after certificates of occupancy had been issued and the homes had been sold.

The case involved exterior construction defects, not blower door or duct leakage tests. Its relevance is that a certificate of occupancy or property transfer does not automatically prevent later code enforcement.

Read DKM Residential Properties Corp. v. Township of MontgomeryWhich tests are required for new construction, small homes, additions, and rehabilitation projects?

New construction: A blower door test is required. A duct leakage test is also required for applicable ducted HVAC systems.

Small homes: Covered new homes still require a blower door test. For projects governed by the 2021 IECC, buildings or dwelling units measuring 1,500 square feet or less may use an enclosure-area leakage limit instead of the standard ACH50 limit. The approved plans and applicable code edition determine the exact passing requirement.

Additions: A blower door test is generally not required. A duct leakage test is required only for new ductwork located within the addition. An extension of an existing duct system must be isolated at the addition boundary when tested.

Rehabilitation and existing buildings: Blower door and duct leakage tests are generally not required under the New Jersey Rehabilitation Subcode. The permit classification and approved documents should always be checked before making a final determination.View the NJ DCA Mechanical Energy MatrixWhere does Keystone provide testing?Keystone serves residential construction projects across New Jersey and eastern Pennsylvania. Contact us before booking if your project is outside our standard service area.Who does Keystone work with?Keystone works with builders, HVAC contractors, developers, general contractors, construction managers, and homeowners who need independent testing and documentation for residential projects.When should testing be scheduled?Blower door testing is generally completed near the end of construction, after the building enclosure is substantially finished.Duct leakage testing may be completed during rough-in or after the HVAC system is fully installed. Scheduling early allows time for corrections and retesting before the final inspection or project deadline.What should be ready before a blower door test?Exterior doors and windows should be installed, the building enclosure should be substantially complete, and major penetrations should be sealed. Electrical power must be available, and the tester must have safe access to the entire conditioned area, including attics, crawlspaces, and mechanical rooms.What should be ready before a duct leakage test?The ductwork being tested should be installed, sealed, and accessible. Supply and return openings must be available for temporary sealing.For post-construction testing, the air handler and complete duct system should be installed. If the test is being scheduled during rough-in before the air handler is installed, tell Keystone in advance so the correct testing scope can be confirmed.Current plans, conditioned floor area, and the number of HVAC systems should be available when possible.When will I receive the results and certificate?Keystone sends the invoice and measured results after the appointment. Once payment is received, the formal test certificate is generally issued the same day.What happens if the project does not pass?Keystone provides the measured result and explains any observable conditions identified during testing. The responsible contractor can then complete the necessary corrections.A retest may be required to verify that the project meets the applicable limit and to issue passing documentation. Keystone does not perform air sealing, duct sealing, HVAC installation, insulation, or repair work.Can Keystone test a home with multiple HVAC systems?Yes. Each required HVAC system can be tested separately. Include the number of systems when booking so Keystone can confirm the testing scope, appointment length, and pricing.What types of residential projects can Keystone test?Keystone tests single-family homes, townhomes, rowhomes, duplexes, and selected multifamily residential projects. Submit the project details so we can confirm the testing requirements and scope.How Do I Schedule a Test?Complete the online booking form or call (877) 517-0004. Keystone will review the submitted information and confirm the appointment.Be prepared to provide the project address, requested service, building type, conditioned floor area, number of HVAC systems, construction status, preferred date, and site-access information.How much does a blower door and duct leakage test cost?

Pricing depends on the requested test, number of HVAC systems, project location, and any additional testing requirements. Current single-test pricing is listed on our home page.Builders and contractors with recurring testing volume can ask about preferred pricing through the Keystone Builder Partner Program.Does Keystone perform NEMA, IP, or industrial enclosure testing?No. Keystone specializes in residential blower door and duct leakage testing. We do not perform NEMA, IP, IEC 60529, environmental-chamber, or industrial-product enclosure testing.