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What Headwaters says hardening costs
Headwaters Economics does not bid your lot. The opened Fall 2025 PDF (Barrett and Hawks) prices a one-story, 1,750-square-foot model in Altadena with a $500,000 construction value. CWUIC Part 7 (Chapter 7A as of 1 January 2026) adds about $13,000 in wildfire-resistant materials over traditional. IBHS Wildfire Prepared Home Base is more than $4,000 less than that Part 7 increment. Plus is about $2,000 more than Part 7. The 0–5 foot noncombustible zone is in the model. The rest of the yard is not. The January 2026 update in the same PDF says Altadena rebuilds are running $450–$650 per square foot because of labor, not those materials.
You are at a kitchen table with a $13,000 headline and a contractor’s $180,000 rebuild allowance. Those are different piles. Headwaters priced assemblies on a pour-on-grade 35-by-50-foot box with a tiled roof and fiber-cement siding. Your estimator priced a crew in a post-fire market. Do not paste the headline onto the bid.
This page is the opened Headwaters numbers. The home-hardening ladder is order of operations and says its dollar bands are not prices. IBHS does not replace adopted code. Oregon R327 is not this model.
Why it matters
People hear “2 to 3 percent” and either skip the five feet or treat a $13,000 increment as the whole rebuild. The PDF splits those jobs. Wildfire-resistant materials on this model are a small increment. Labor and overhead after a disaster are not. Yard work past five feet was out of scope. Mixing those three is how a drawing ships with “Headwaters says it’s cheap” in the notes and no vent spec.
How it works
The Fall 2025 study compares four material packages on one house: traditional (not subject to CWUIC Part 7), CWUIC Part 7, IBHS Base, IBHS Plus.
| Package (opened PDF p. 4) | What Headwaters names as the increment | What it is not |
|---|---|---|
| Traditional | The baseline on this model | Oregon R327. A local bid. |
| CWUIC Part 7 / Chapter 7A | About $13,000 over traditional: flame- and ember-resistant vents, open-eave considerations, metal gutters, fire-rated wallboard, dual-pane single-tempered windows, 0–5 foot zone (rock mulch and metal fence) | A 100-foot defensible-space budget |
| IBHS Wildfire Prepared Home Base | More than $4,000 less than the Part 7 increment: no gutter-guard requirement, open-eave materials, non-tempered windows | A permit. IBHS is a designation |
| IBHS Plus | About $2,000 more than Part 7: enclosed eaves, noncombustible soffits, double-tempered windows | A reason to skip Part 7 where CWUIC is adopted |
The model is a pour-on-grade foundation. The PDF says no foundation vents are in the analysis. Southern California assumptions include a tiled roof, fiber-cement siding, and a concrete patio. An 18 percent inflation adjustment was applied to 2023 RSMeans data.
The PDF also says the estimates do not include contractor markup (labor, overhead, profit) in the methods section, while the January 2026 update describes RSMeans as including materials, labor, and contractor overhead and profit. Those two sentences both sit in the opened file. Do not collapse them. Ask which pile a number came from.
The paths
1. New house, California mapped WUI. Spec the adopted book. Headwaters’ Part 7 increment is a research model, not the permit. See R327 versus CWUIC. Do not tell an Oregon official that Headwaters priced R327. It did not.
2. New house, IBHS named by the carrier. Base versus Plus is the designation ladder, not CWUIC. The PDF’s Base savings versus Part 7 come from no gutter guard, open eaves, and non-tempered windows. If the official wants listed vents and the carrier wants IBHS, spec both. Do not delete a code item because Headwaters showed Base cheaper.
3. Existing house. Open the 2024 retrofit landing. Simple: $2,000–$15,000 (vents, deck flashing, gutters, noncombustible mulch). Highest-level: nearly $100,000. Little to no cost: fuels next to the house, debris on the roof. Then walk the hardening ladder. That ladder’s dollar bands are sequence, not these figures.
4. Post-fire rebuild. The January 2026 box: local Altadena organizations reported $450–$650/sf, not the $285/sf used in the study. On 1,750 square feet that is $787,000 to $1.14 million against $500,000. The update says wildfire-resistant materials are not what moved the number; labor and overhead did. Home Depot local material prices for the Plus spec were $2,418 less than the report’s material assumptions. Enclosing eaves is the named labor exception. See rebuild after wildfire.
5. The five feet, still. Both papers put a 0–5 foot Zone 0 in the cheap pile when it is rock and a metal fence, and they put yard work past five feet outside the new-construction study. Clearing gutters and pulling mulch is not a $13,000 line. See gutters and debris.
6. Oregon. This model is Altadena and Chapter 7A / CWUIC / IBHS. It is not R327. Do not import the $13,000 as an Oregon change-order.
What people mix up
- Treating 2–3 percent as a bid.
- Treating the $13,000 as including the 100-foot yard. The PDF put that yard out of scope.
- Treating IBHS Base as cheaper code. Base omitted items Part 7 still wants (gutter guard, tempered glass, enclosed-eave path).
- Treating the 2024 retrofit $2,000–$15,000 as the 2025 new-construction increment, or the reverse.
- Treating RSMeans national averages as Los Angeles post-fire labor.
- Treating the methods line “no contractor markup” and the update line “RSMeans includes labor and O&P” as one sentence.
- Treating a pour-on-grade, no-vent model as a crawl-space house. See mesh versus listed vents.
- Treating Headwaters as adopted code.
How to check
- Open the Fall 2025 PDF. Read page 4’s three bullets and the beyond-five-feet scope sentence.
- Read the January 2026 gray box: $285/sf versus $450–$650/sf, and the $2,418 material check.
- Open the 2024 retrofit page. Separate $2,000–$15,000 from nearly $100,000.
- Name the document on your drawing: CWUIC, IBHS Base, IBHS Plus, or R327. Headwaters is none of those stamps.
- If a bid is 2–3 percent over last year’s house, ask whether that is materials on this model or labor in this market.
- Appendix cost tables in the PDF did not render as readable text this session. They are not quoted cell-by-cell. Use the prose findings that did open.
Limits
This page does not estimate your house. It does not replace a contractor bid. It does not adopt CWUIC or IBHS. FireApproved is not Headwaters or IBHS. The 2–3 percent band, the $13,000 / $4,000 / $2,000 increments, and the $500,000 model value are the opened Fall 2025 findings for that 1,750-square-foot Altadena box. Retrofit dollars are the opened 2024 landing. Confirm the current PDFs before you put a number on a drawing.
Questions
Does Headwaters say wildfire-resistant new construction is 2 to 3 percent more?
The opened Fall 2025 landing page and PDF use that band for a one-story, 1,750-square-foot model with a $500,000 construction value. CWUIC Part 7 adds about $13,000 over traditional materials. IBHS Wildfire Prepared Home Base is more than $4,000 less than that Part 7 increment. Plus is about $2,000 more than Part 7. Those are materials-and-design increments on that model, not a bid for your lot.
Does that $13,000 include the 100-foot yard?
No. The Fall 2025 PDF says analyzing wildfire-resistant measures beyond five feet from the home, including surrounding defensible space and the space between homes, was beyond the scope. The 0–5 foot noncombustible zone (rock mulch and metal fence in the Part 7 scenario) is in the model. The rest of the yard is not.
Why are Altadena rebuilds quoted at $450 to $650 a square foot then?
The January 2026 update in the same PDF: local organizations reported $450–$650 per square foot rather than the $285 per square foot used in the analysis. On that 1,750-square-foot home that is $787,000 to $1.14 million against the $500,000 assumption. The update says the jump is labor and contractor overhead, not the wildfire-resistant materials. Home Depot local material prices for the Plus spec were $2,418 less than the report’s material assumptions.
What about retrofitting an existing house?
A different Headwaters paper, Retrofitting a Home for Wildfire Resistance (landing opened 25 August 2026; coauthor Stephen Quarles; partnership with CAL FIRE). Simple actions such as ember-resistant vents, metal flashing at a deck, clean gutters, or noncombustible mulch: $2,000–$15,000. A full retrofit to the highest level of protection: nearly $100,000. Removing flammable materials near the home and debris from the roof: little to no cost. That paper scores Chapter 7A, not Oregon R327.