# What blower‑door numbers should homeowners demand after major renovations?

**URL:** <https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050>\
**Category:** Trade Talk\
**Created:** [August 4, 2025, 3:24pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050 "2025-08-04T15:24:53Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![reno\_questions](https://home.renovation.reviews/user_avatar/home.renovation.reviews/reno_questions/32/2758_2.png) [@reno\_questions](https://home.renovation.reviews/u/reno_questions)\
**Post date:** [August 4, 2025, 3:24pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/1 "2025-08-04T15:24:53Z")

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What blower‑door numbers should homeowners demand after major renovations?

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**Author:** ![Tim\_Michael1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_michael1/32/6294_2.png) [@Tim\_Michael1](https://home.renovation.reviews/u/Tim_Michael1)\
**Post date:** [August 13, 2025, 3:17pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/2 "2025-08-13T15:17:17Z")

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For most retrofits, shoot for about three air changes per hour at fifty pascals or even tighter. If you’ve gone all-out high-performance, less is fine. Just cut those leaks enough without making the air stale! Make sure you have good ventilation, okay?

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**Author:** ![Bobby\_Michael](https://home.renovation.reviews/user_avatar/home.renovation.reviews/bobby_michael/32/2057_2.png) [@Bobby\_Michael](https://home.renovation.reviews/u/Bobby_Michael)\
**Post date:** [August 13, 2025, 7:41pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/3 "2025-08-13T19:41:08Z")

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When it comes to blower-door numbers after major renovations, homeowners should aim for specific targets based on the type of building and its intended energy efficiency level.

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**Author:** ![Tim\_curtis](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_curtis/32/2766_2.png) [@Tim\_curtis](https://home.renovation.reviews/u/Tim_curtis)\
**Post date:** [August 14, 2025, 4:13pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/4 "2025-08-14T16:13:35Z")

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Homeowners should expect 3–5 ACH50 for typical code-compliant renovations and 1–3 ACH50 for high-performance or passive-house upgrades, always combined with proper mechanical ventilation.

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**Author:** ![Theodore\_3456](https://home.renovation.reviews/user_avatar/home.renovation.reviews/theodore_3456/32/2821_2.png) [@Theodore\_3456](https://home.renovation.reviews/u/Theodore_3456)\
**Post date:** [August 14, 2025, 4:21pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/5 "2025-08-14T16:21:18Z")

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Homeowners should aim for tight, energy-efficient results without compromising ventilation:

Existing homes: ≤5.0 air changes per hour at 50 Pa (ACH50) is a reasonable target after major renovations.

High-performance retrofits: ≤3.0 ACH50 for energy-efficient or near‑Passive House upgrades.

New construction benchmarks: 1.5–2.5 ACH50 is typical for code‑compliant or high-efficiency homes. Always ensure mechanical ventilation meets local code to maintain indoor air quality even in tight homes.

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**Author:** ![Lexi\_Carter1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/lexi_carter1/32/2767_2.png) [@Lexi\_Carter1](https://home.renovation.reviews/u/Lexi_Carter1)\
**Post date:** [August 14, 2025, 5:32pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/6 "2025-08-14T17:32:23Z")

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For most blower-door numbers,Aim for ≤3 ACH50 after major renovations; lower is better for comfort and efficiency.

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**Author:** ![kent\_0902](https://home.renovation.reviews/user_avatar/home.renovation.reviews/kent_0902/32/2825_2.png) [@kent\_0902](https://home.renovation.reviews/u/kent_0902)\
**Post date:** [August 14, 2025, 5:42pm UTC](https://home.renovation.reviews/t/what-blower-door-numbers-should-homeowners-demand-after-major-renovations/20050/7 "2025-08-14T17:42:45Z")

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After major renovations, your home should be airtight enough to save energy and feel comfortable ideally no more than about three air changes per hour, and even tighter for high-performance homes.