October 2026 RoMac Whole House Commodity Report: The Index Is Down. The Cost of Building Isn't

RoMac Whole House Commodity Index, October 2026: $54,037. The Index tracks wholesale costs for a 2,200-square-foot wood-frame home with a concrete stem wall in Central Florida.

The RoMac Whole House Commodity Index fell 0.5 percent in October to $54,037 from $54,318 in September. Lower framing lumber prices were the main driver while OSB moved the other direction and kept rising. That's welcome news for builders buying lumber, but it doesn't mean the overall cost of building or buying a home is falling. Rates hit 7.40 percent, fuel jumped again, and tariffs are still adding nearly $11,000 to the cost of a typical new home. The savings in lumber are getting absorbed elsewhere.

New-Home Market: Better Numbers, Complicated Picture

New single-family home sales came in at 684,000 annualized in August, up 6.4 percent from July's revised 643,000. The Census Bureau flagged the monthly gain as not statistically significant given the margin of error. Sales are still 2.0 percent below August 2025, and the year-to-date pace continues to trail 2025. Builders got there by cutting prices and adding incentives, not because demand improved on its own. The median new home price was $393,700, down 5.8 percent from a year ago. Inventory stayed at 483,000 homes, or 8.5 months of supply.

Single-family starts rose 7.6 percent in August to 918,000, a five-month high. The total starts headline fell 2.6 percent because multifamily collapsed 21.7 percent. Those are two different stories. Year-to-date single-family starts are still about 5 percent below 2025, and single-family permits dipped 1.8 percent to 878,000. The market rewards selling completed homes over starting new ones right now.

What Builders Should Be Watching Right Now

Buyers across Florida are more payment-sensitive right now than they've been all year. At 7.40 percent, the rate environment is more expensive than it was a year ago, and that's showing up in pending sales, longer days on market, and more price reductions. Well-priced homes in markets with limited new construction are still moving. Stale or overpriced inventory is sitting. Buyers haven't gone away. They're just doing the math a lot more carefully.

Be cautious with spec construction. National new-home inventory is near historic highs, rates crossed 7 percent, Florida pending sales are falling, and Hurricane Isaias delayed closings across the state heading into Q4. That's a margin conversation to have before you break ground, not after.

New construction still has a real argument over resale that works anywhere in Florida: insurance costs and code compliance. A home built to current standards qualifies for meaningfully lower premiums than comparable resale homes. At today's carrying costs, that's a real monthly payment difference buyers can feel. Make sure they know that before they compare your price tag to a resale listing.

Florida: September Softened Before the Storm

Florida's September numbers were softening before Hurricane Isaias made landfall. Rates are the reason. The favorable year-over-year rate comparison that drove Florida's 12-month sales streak ran out, and September showed it.

Closed single-family sales fell 3.5 percent year-over-year to 20,537. The statewide median held at $415,000, unchanged from August and up 1.2 percent over the year. Single-family inventory tightened to 4.4 months of supply. Condo and townhouse inventory sits at 7.7 months. Pending sales are the number worth watching. New pending single-family sales dropped more than 7.5 percent year-over-year in September, with South Florida markets down even further. Pending sales lead closed sales by 30 to 60 days, so October and November data will be softer regardless of what Isaias adds.

Hurricane Isaias made landfall near Destin on October 9 as a Category 2 storm with 105 mph winds. Four people were killed, Governor DeSantis declared a state of emergency for 27 counties, and a federal emergency declaration followed. The Panhandle took the direct hit, but the real estate impact spread further. Mortgage approvals, loan funding, and closings all slow down when a hurricane is tracking toward the state, even in counties that don't see a direct hit.

Mortgage Rates: 7.40 Percent

The 30-year fixed averaged 7.40 percent as of October 15 per Freddie Mac, unchanged from the prior week. A year ago it was 6.27 percent. Put that in dollars: a buyer financing $350,000 pays $2,423 a month now versus $2,159 at last year's rate. That's $264 more every month without buying anything more expensive. For buyers already stretching, it's enough to push them into a lower price range.

Rates squeeze builders from both ends. Construction financing and carrying spec inventory cost more at 7.40 percent, while buyers need price cuts, buydowns, and closing cost help to get across the finish line. All of that comes out of margin. There's no near-term relief. Building material price inflation is near a four-year high, with the Producer Price Index for final demand up 6.3 percent year-over-year.

What's Actually Driving Material Price Inflation

Lumber getting cheaper doesn't mean the full cost of building is getting cheaper. Four things are keeping upward pressure on materials that don't show up in the Index.

Tariffs are the biggest structural driver. Section 232 tariffs on steel and aluminum sit at 50 percent. Steel mill products are up roughly 20 percent year-over-year. Metal molding and trim is up 50 percent, the largest single-category increase in the building materials universe right now. Rebar, structural connectors, wire mesh, framing hardware, and roofing metals all carry that tariff load. Canadian lumber still carries a combined duty of about 35 percent. And switching to domestic steel doesn't fix it. Those producers have matched the tariff-inflated import prices because they can. You pay the same either way. NAHB estimates tariffs add roughly $10,900 to the cost of a typical new home. That cost doesn't go away when lumber comes down.

Fuel is back as a real cost driver. Gasoline rose 9.1 percent in September and is up 34.2 percent year-over-year. Everything that goes into a house gets transported, often multiple times. Higher diesel flows through freight charges, vendor pricing, and manufacturing costs. Anything made with petroleum, like roofing underlayment, housewrap, and foam insulation, is getting hit twice, once on the material itself and again on the freight. Florida adds another layer: the state receives far more inbound freight than it sends back out, which creates a structural backhaul imbalance that inflates inbound freight rates. Getting trucks into Florida is often more expensive and harder to book than shipping into most other markets.

Labor shortages are getting worse, not better. NAHB's September survey found them becoming more widespread across the industry. When workers are hard to find, schedules slip, subcontractors charge more, and delays compound fast when you're running a construction loan above 7 percent.

Lot availability is also a problem. Eighty percent of builders in that same survey rated current lot availability as poor or fair. You can cut lumber prices all you want. If you can't find workers and can't find lots, you can't build.

What Moved Last Month

Lumber fell across most categories. Southern Pine 2x12 declined 13.2 percent and 2x6 Southern Pine fell 11.1 percent. Spruce studs dropped 8.8 percent. Pressure-treated 4x4 declined 5.2 percent. Other spruce and Southern Pine sizes also moved lower. Wire mesh dropped 7.2 percent.

OSB went the other direction, and it's worth understanding why. Sheathing increased 8.8 percent in October after rising 10.7 percent in September, roughly 20.5 percent compounded over two months. OSB pricing is driven by mill operating rates, log strand availability, and resin costs tied to petrochemical markets. Producers manage capacity tightly, so when demand tightens even modestly, prices move fast. CDX plywood was unchanged, which tells you this is specific to OSB, not a broad sheathing move. Rebar increased 2.3 percent. Truss pricing was flat after declining the two months prior.

Roofing, drywall, insulation, windows, doors, siding, and garage doors were largely unchanged month-over-month.

One thing worth knowing about roofing: the month-over-month calm doesn't reflect where prices actually are. Every major shingle manufacturer raised prices 4 to 8 percent in spring 2026, then major distributors pushed through a second round of increases of 6 to 10 percent effective June 1. Asphalt shingles are now 8 to 15 percent higher than a year ago and roughly 35 to 45 percent above 2021 levels. Metal roofing took a harder hit. The same steel and aluminum tariffs that are pushing up rebar and connectors have pushed metal roofing material costs up 15 to 25 percent since 2024. Builders quoting roofing packages should be pulling current supplier pricing, not last year's numbers.

The important point is to look at the actual material list for each project. A house with a heavy framing package benefits meaningfully from lower lumber. A house with a lot of OSB sees much less of that savings.

Remodeling Remains a Bright Spot

Remodeling continues to hold up well. The NAHB Remodeling Market Index rose to 62 in Q3, the third consecutive quarter with current conditions at 70. NAHB projects remodeling stays stable through 2026 and grows in 2027. Homeowners with 3 to 4 percent mortgages aren't moving, and for many of them putting money into their current home makes more sense than taking on a new loan above 7 percent. That's real demand for replacement windows, doors, roofing, and siding, the kind of work that keeps crews busy when new construction slows.

What to Do With All of This

Lock in the lumber savings now on projects that are sold or scheduled. Southern Pine and spruce have come down hard. Lumber markets can reverse quickly. OSB is proof of that. Confirm current pricing with suppliers before committing, especially on products that have moved sharply. Some vendors are repricing every one to two weeks.

Freight and delivery planning matter just as much. Consolidating loads, avoiding unnecessary trips, and staging material correctly reduce costs. Fuel is up 34 percent year-over-year, and Florida's freight dynamics make every wasted delivery more expensive than most markets.

Labor scheduling and order accuracy matter too. Rework, missing material, and delayed inspections get more expensive when projects are carrying higher financing costs. Get it right the first time.

Keep escalation clauses in contracts on longer-timeline projects. Material price inflation is near a four-year high and this isn't the environment for fixed-price commitments without protection.

Don't overlook remodeling. Homeowners staying put are spending on their properties and that demand is durable. It's a real opportunity for anyone who can serve both markets.

The RoMac Building Supply Whole House Commodity Index is based on wholesale costs of the base components to build a 2,200-square-foot wood-frame home with a concrete stem wall in Central Florida. The Index includes foundation, metal, concrete, block, stucco, cement, wood framing, siding, sheathing, trusses, roofing, drywall, insulation, windows, doors, trim, garage doors, and most building hardware. It does not include decor, electrical, plumbing, mechanical, landscaping, or labor. Because the Index uses current wholesale costs, it serves as a leading indicator of the direction of residential building material prices over the next 30 to 45 days.

Jake Trapp is the President of RoMac Building Supply in Central Florida.

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