The 30-second version
- Retrofit sequence matters: highest ROI items first, expensive items last, but sequenced so nothing has to be redone.
- Total cost for full retrofit: $30,000-$120,000+ depending on home size and existing condition.
- Phase-friendly: most homeowners spread retrofit across 2-4 phases over 12-24 months.
- Insurance ROI: full retrofit typically recovers cost in 4-8 years through Safer from Wildfires stacked discounts.
Phase 1: Defensible space + easy Zone 0 (1-2 weeks, $500-$3,000)
Highest ROI, lowest cost, no permits required. Do this first regardless of other retrofit plans.
- Remove all combustible mulch from within 5 ft of exterior walls
- Remove combustible vegetation from Zone 0 (0-5 ft)
- Remove stored combustibles from Zone 0 (firewood, propane tanks, plastic planters, wooden furniture)
- Clear all gutters of leaf litter
- Prune tree limbs 10+ ft from roof and 10+ ft above ground
- Remove dead vegetation from Zone 1 (5-30 ft) and Zone 2 (30-100 ft)
Phase 2: Ember-resistant vents (1-2 days, $800-$2,500)
Small project with outsized impact. Replace all attic and crawlspace vents with WUI-rated intumescent products or 1/8-inch corrosion-resistant metal mesh. Includes soffit vents, gable vents, dormer vents, and any exterior wall vent (dryer, bathroom exhaust, kitchen hood termination). No permit required in most jurisdictions.
Phase 3: Class A roof at next re-roof cycle (project-dependent, $12,000-$50,000+)
Sync this with your existing roof's replacement cycle rather than tearing off a still-functional roof. If your existing roof is under 15 years old and in good condition, wait until natural replacement. If your existing roof is over 20 years old or in a VHFHSZ with Chapter 7A applying to your next work, plan the re-roof now.
- Class A fire-rated assembly (concrete tile, clay tile, standing-seam metal, or Class A architectural asphalt)
- Fire-rated underlayment as part of the certified assembly
- Fire-blocked ridge and hip caps
- Full documentation for Safer from Wildfires insurance submission
Phase 4: Non-combustible eaves + siding (bundled with re-roof or independent, $8,000-$35,000)
Eaves are commonly re-detailed during a re-roof and represent ~$4,000-$12,000 of that scope. Full siding replacement is a separate project and typically only done when siding is failing anyway. In that case, upgrade to fiber cement (Hardie), stucco over metal lath, or another Chapter 7A-compliant assembly.
Phase 5: Fire-rated windows (project-dependent, $12,000-$60,000+)
Sync with your natural window replacement cycle. If your existing windows are dual-pane and under 20 years old, wait. If you're replacing anyway, upgrade to tempered dual-pane minimum, or ceramic glazing on canyon/ridge-facing elevations for premium exposure.
Phase 6: Ignition-resistant decking (project-dependent, $6,000-$25,000)
Deck boards within 10 ft of the primary structure must be ignition-resistant, heavy timber, or non-combustible. Most common upgrade: composite decking (Trex Signature, TimberTech AZEK Class A). Sync with your deck's natural replacement or refinishing cycle.
Phase 7: Wildfire sprinkler defense (2-7 days, $6,500-$60,000+)
Once the structure itself is hardened, add the active layer. Basic municipal-pressure system for standard homes; pumped system with dedicated water storage for canyon and ridgeline properties. See our wildfire sprinklers Los Angeles page for detail.
Phase 8: HVAC filtration upgrade (1-3 days, $400-$3,500)
MERV 13 filter as baseline; standalone HEPA scrubber ($1,200-$3,500 installed) for high-exposure households or occupants with respiratory concerns. See our wildfire smoke HVAC guide.
What order to hire out
Practical bundling for cost efficiency:
- Bundle 1 (immediate): Phases 1 + 2 done as a single project. $1,300-$5,500 total. Do this now.
- Bundle 2 (next re-roof cycle): Phases 3 + 4 + 6 as a single project. $22,000-$100,000 total. Coordinate with roof lifecycle.
- Bundle 3 (next window replacement cycle): Phase 5 as its own project.
- Bundle 4 (independent): Phases 7 + 8 as one project. $6,900-$63,500 total.
Halo Build Co handles Phases 1-2, 3-4, 6, and 7 in-house and coordinates window and HVAC contractors for Phases 5 and 8. See our Chapter 7A contractor page.
Frequently asked questions
How much does a full whole-home fire hardening retrofit cost?
Total cost ranges from $30,000 to $120,000+ depending on home size, existing condition, and material choices. Most homeowners phase the work across 2-4 phases over 12-24 months. Insurance ROI is typically 4-8 years through Safer from Wildfires stacked discounts.
What should I do first if I want to harden my home?
Phase 1 (defensible space + Zone 0 hardening) — 1-2 weeks, $500-$3,000, no permits. Highest ROI, lowest cost. Remove combustible mulch, vegetation, stored combustibles from within 5 ft of walls; clear gutters; prune tree limbs. This should happen before anything else regardless of other retrofit plans.
Can I harden my home in phases rather than all at once?
Yes — phased retrofit is the norm. Bundle Phase 1 + 2 immediately (defensible space + ember-resistant vents, $1,300-$5,500). Then sync Phases 3-4-6 (Class A roof + eaves + decking) with your next re-roof cycle. Sync Phase 5 (windows) with natural window replacement. Do Phase 7 (sprinklers) and Phase 8 (HVAC filtration) as independent projects.