Home Hardening
Home Hardening Ranked: What Works and What It Costs
Not all wildfire hardening spends the same. Research from IBHS, NIST, and CAL FIRE shows the cheapest measures, ember-resistant vents, a cleared first 5 feet, clean roof edges, and a fence break, block the ember pathways that ignite most homes, while the most expensive projects often add the least new protection. Here is every common measure, ranked by effectiveness, with real cost ranges and the evidence behind each.
| Measure | Typical cost | Cost tier | Effectiveness |
|---|---|---|---|
Ember-resistant vents Vents are the primary path embers use to enter and ignite a home. NIST and IBHS research attributes most wildfire home ignitions to embers, not flames. | $1,500 - $4,500 whole house | Low | High |
Zone 0: clear the first 5 feet IBHS found homes with more than 25% fuel cover in the first 5 feet had a 90% likelihood of damage or destruction in the 2025 LA fires. | $500 - $3,000 | Low | High |
Roof edge and gutters: debris removal, metal gutter guards Dry debris at the roof edge is a landing pad for embers. On CAL FIRE's low-cost retrofit list; cheap and repeatable. | $300 - $1,500 | Low | High |
Fence: noncombustible break in the last 5 feet Wood fences act as a wick that carries fire to the wall. Swapping the final section to metal breaks the path. CAL FIRE low-cost list item. | $200 - $1,000 | Low | High |
Enclosed eaves One of the four key features in IBHS's post-fire study of the Eaton and Palisades fires. | $2,000 - $8,000 | Medium | Medium-High |
Double-pane or tempered windows Protects against radiant heat breaking glass. Part of the IBHS four-feature system that gave homes a 54% likelihood of avoiding damage. | $10,000 - $30,000 whole house | High | Medium |
Noncombustible siding Matters most where homes are close together and radiant heat from a burning neighbor is the threat. IBHS four-feature system. | $15,000 - $40,000+ | High | Medium |
Class A roof replacement Essential if you still have wood shake. Most roofs installed since the mid-1990s are already Class A, so replacing one rated roof with another buys little. Check before you spend. | $15,000 - $30,000+ | High | Situational |
Deck: gap sealing or noncombustible rebuild IBHS ember testing shows debris in deck gaps and combustible boards ignite from ember showers. | $1,000 - $15,000 | Medium | Medium |
Garage door weather seal Embers blow under unsealed garage doors. One of the cheapest items on CAL FIRE's low-cost retrofit list. | Under $200 | Low | Medium |
Exterior sprinkler systems No post-fire study support yet. Municipal water pressure often fails during major fires. Consider only after the proven measures above. | $3,000 - $15,000+ | High | Unproven |
The pattern in the data
The four low-cost items at the top of the table together typically cost less than $6,000 and address the ember entry paths implicated in 80 to 90 percent of home ignitions. The three most expensive projects cost $40,000 to $100,000 combined and mostly strengthen protection many homes already have. If you are prioritizing, work down the table in order, and read why a new roof is usually the wrong first purchase.
RF1 installs the top of this table: ember-resistant vents, Zone 0 defensible space, gutter protection, and fence breaks, and documents the work for your insurer. Several measures may also qualify for grants: check the California Wildfire Grant Finder.
Which of these is your house missing?
A free RF1 assessment walks your property against this exact list and hands you a priority order, so the first dollar you spend blocks the most likely ignition.
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