Whether you are aiming to meet residential energy code requirements for new construction, looking to lower winter heating bills in an older home, or troubleshooting uncomfortable drafts, a blower door test is the single best diagnostic tool to measure building envelope airtightness.

At SBC Testing, transparent pricing is essential. Homeowners, builders, and real estate professionals should know exactly what to expect before scheduling an assessment. Below is a detailed breakdown of blower door testing costs, travel coverage across the state, and what factors influence final project pricing.

Standard Blower Door Test Pricing

For a single-family home or residential structure, diagnostic testing is structured with a straightforward base fee paired with travel distance. SBC Testing services and travels anywhere in New Hampshire.

Sample Price Calculations from Conway, NH

• Conway / North Conway Local: 250base+(2 × ~5 miles) = ~$260
• Tamworth / Jackson (~20 miles): 250base+(2 × 20 miles) = ~$290
• Plymouth / Laconia (~50 miles): 250base+(2 × 50 miles) = ~$350
• Concord (~75 miles): 250base+(2 × 75 miles) = ~$400
• Manchester / Seacoast Area (~100 miles): 250base+(2 × 100 miles) = ~$450

What Factors Can Adjust the Base Cost?

While the $250 base rate covers the vast majority of residential tests, certain architectural and structural properties require additional time, preparation, or specialized diagnostic gear. Larger homes or complex/broken-up layouts typically add only $50 to $100 to the total cost.

1. Large Square Footage (>3,000 sq ft)

Larger structures contain a significantly higher volume of air. Pressurizing or depressurizing a large home requires higher airflow capacity—sometimes requiring multi-fan setups or longer dwell times to stabilize target pressures (50 Pascals). Larger properties add an additional 50–100 depending on total size.

2. Complex or "Broken-Up" Floor Plans

Homes with highly segmented layouts—such as multiple additions, attached unconditioned spaces, complex cathedral ceilings, or multi-zone knee-wall spaces—take considerably longer to trace, measure, calculate, seal temporary openings (like combustion appliances), and diagnose properly. Complex layouts add an additional $50–$100 for the extra time required.

3. Comprehensive Leak Detection & Thermal Imaging

If the goal goes beyond code verification (getting a pass/fail ACH50 number) to actively identifying where air leaks are located, combining the blower door depressurization with an infrared thermography or smoke testing walk-through adds diagnostic depth and time.

What Is Included in a Blower Door Test?

When SBC Testing arrives on-site, a standard diagnostic visit includes:

1. Pre-Test Inspection: Closing exterior windows and doors, setting HVAC controls, and prepping fireplace dampers or ash pits.
2. Setup & Depressurization: Installing the expandable frame, flexible panel, calibrated fan, and digital manometer in an exterior doorway to pull a standard 50 Pascal pressure difference.
3. Measuring and calculating the volume: Going everywhere in the home to measure and calculate the volume of conditioned space.
4. Quantitative Measurement: Recording total air leakage in CFM50 (Cubic Feet per Minute at 50 Pa) to calculate ACH50 (Air Changes per Hour).
5. Code Compliance Documentation: Providing official testing results required for town building inspectors and energy code sign-offs (e.g., IECC / NH State Energy Code compliance).

Ready to Schedule Your Air Leakage Test?

Whether you are in Carroll County, the White Mountains, the Lakes Region, or anywhere else in New Hampshire, SBC Testing is available to help homeowners and contractors verify code compliance and pinpoint energy loss. Contact us today for an exact quote.