Whole House Commodity Index May 2026
- Jake Trapp
- 6 days ago
- 5 min read
Falling Lumber, Rising Non-Wood Costs, and a Narrow Window for Builders
The RoMac Building Supply Whole House Commodity Index for May 2026 declined 1.3 percent to $53,880, even as delivery costs rose sharply on elevated diesel prices. Year-over-year, the Index has increased 2.1 percent, remaining well within normal inflation targets and reflecting a market that, while under pressure, has not yet broken.
The drop in the overall Index masks a significant divergence beneath the surface: wood commodity prices are retreating on softening demand, while non-wood materials, including windows, siding, roofing, and other petroleum-dependent products, are pushing higher on fuel and raw material cost increases. That split is the central story of this month's report, and it carries an important warning for builders pricing future work.
Across the supply chain, mills and manufacturers are implementing fuel surcharges and delivery cost increases to offset diesel pricing that remains elevated by the ongoing conflict in the Middle East. Builders should expect these surcharges to persist and, in some categories, accelerate.
Housing Market Sends Mixed Signals
Recent housing data continues to reflect an uncertain and highly fragmented market environment.
According to the U.S. Census Bureau, national housing starts in March increased 10.8 percent year-over-year, pushing annualized starts back above the 1.5 million-unit threshold and signaling renewed activity entering the spring selling season. However, building permits, a leading indicator of future construction activity, declined 7.4 percent year-over-year, suggesting potential slowing ahead.
Florida's housing market showed additional weakness. March 2026 housing starts in Florida declined from 14,771 units in 2025 to 12,449 units this year, representing a sharp 15.7 percent decrease.
At the same time, Florida Realtors reported first-quarter 2026 home sales increased 5.3 percent statewide, while median home pricing remained essentially flat, rising only 0.1 percent to $415,500. Housing inventory also tightened modestly, decreasing from 5.5 months of supply in 2025 to 4.8 months in 2026.
Taken together, the data suggest demand remains present, but affordability pressures and elevated financing costs continue to constrain broader market momentum.
Mortgage Rates Remain the Largest Obstacle
Outside of overall economic strength and employment levels, mortgage rates remain the single most important factor impacting housing demand.
With 30-year Treasury yields remaining above 5 percent, there is currently little indication of meaningful mortgage rate relief. Federal Reserve data shows the average 30-year mortgage rate ended 2025 at 6.15 percent and had risen further to 6.36 percent by mid-May 2026.
Many economists believe ongoing geopolitical instability, elevated oil prices, and inflationary energy costs will continue limiting the Federal Reserve's ability to reduce interest rates in the near term. Until bond markets stabilize and energy pricing moderates, housing affordability will likely remain under pressure.
Major Commodity Price Movers- Last 30 Days
Wood commodity pricing and non-wood material pricing are diverging sharply, and builders need to understand both sides of this split.
Non-wood materials trending higher: Windows were up 5.0 percent on increased raw material and fuel costs. Vinyl siding rose 6.0 percent, driven by higher petroleum-based resin costs and delivery surcharges. Shingle pricing increased 1.6 percent, tied directly to oil prices that feed both asphalt manufacturing and delivery. These increases reflect the ongoing conflict's direct impact on petroleum-dependent building products and are likely to continue or worsen until energy markets stabilize.
Wood commodities softening, a demand signal: The wood market tells a different and more concerning story. CDX pine plywood rose 5.8 percent, but OSB sheathing plunged 21.8 percent on weakening demand and oversupply. Pine lumber prices fell sharply across the board: 2x4 pine dropped 20.9 percent, 2x6 pine fell 12.7 percent, and wide-width 2x12 pine settled 2.7 percent lower. Spruce pricing was mixed, with 2x4 spruce declining 3.1 percent while 2x4 92-5/8 studs added 5.1 percent and 2x6 spruce added a modest 1.1 percent, despite double-digit increases in freight costs. Truss prices dropped 12.2 percent as pine lumber markets cooled and residential demand slowed.
The magnitude of the pine price drops, in some cases exceeding 20 percent in a single month, should be read as a demand signal, not a gift. When lumber markets shed that much value that quickly, it typically means builders and distributors are pulling back on orders. That is not a healthy sign for the spring selling season.
Outlook: Next 30-45 Days Critical for Housing
The next 30 to 45 days present real opportunities for builders who are paying attention. Wood commodity prices, particularly pine framing lumber and OSB, have pulled back significantly, creating a window to lock in favorable pricing on structural materials before demand rebounds. Builders who are active in the market right now have a meaningful cost advantage over those who wait.
The national housing picture, while mixed, has genuine bright spots. March starts hit a 15-month high, Florida's existing home sales rose 5.3 percent in the first quarter, and inventory tightened to 4.8 months, all signs that buyer demand remains present. Consumers want to buy homes. The market is not broken; it is waiting for the right conditions to accelerate.
On mortgage rates, the 30-year fixed rate in the low-to-mid 6 percent range, while higher than anyone would like, is a market that buyers and builders have been successfully navigating. Rates were above 7 percent for much of 2025, and the current environment represents a meaningful improvement from those highs. Any easing in energy prices or bond market volatility could provide additional relief, and several forecasters project a gradual drift toward the upper 5 percent range by year-end.
Practical guidance for builders:
The most important action right now is taking advantage of lower wood prices while they last. Lock in structural material costs where your contracts and cash flow allow. At the same time, be proactive about non-wood material pricing. Windows, siding, roofing, and insulation remain exposed to energy cost swings, and getting firm quotes early protects your margins.
Ensure all new contracts include a price escalation clause for materials with significant commodity or fuel exposure. This is standard practice in volatile markets and protects both the builder and the customer from unexpected cost swings neither party can control.
Builders who price carefully, lock in favorable wood costs now, and protect themselves on non-wood materials are well-positioned to have a productive summer. The fundamentals of Florida housing, including population growth, strong employment, and persistent housing undersupply, remain intact and continue to support long-term demand across Central Florida.
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, sheathings, trusses, roofing, drywall, insulation, windows, doors, trim, garage doors, and most building hardware. It does not include décor, electrical, plumbing, mechanical, landscaping, or labor. Because the Index uses current wholesale costs, this should be a strong indicator of the direction of building prices for the next 30-45 days.
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