Why It Matters
Every month around the 15th, NAHB publishes the HMI — one of the most closely-watched leading indicators in U.S. housing. A single composite number plus three sub-indices: current sales, expected 6-month sales, and buyer traffic. When HMI drops from 46 to 34, builders are pulling back on new starts. Fewer starts today means fewer completions 12-18 months from now, which means less new supply competing with existing inventory. For rental investors, a falling HMI signals future supply tightening (bullish for rents). For buyers, it signals future supply shrinkage (bearish for price). The 50 threshold is critical — below 50, more builders rate conditions "poor" than "good." Historical range since 1985: 8 (2009 trough) to 90 (2021 boom). Long-run average: ~47.
At a Glance
- Scale: 0-100. 50 = neutral. Above 50 = builder optimism. Below 50 = builder pessimism.
- Sub-indices (each on 0-100 scale): Current sales, Expected sales (next 6 months), Buyer traffic. Composite is weighted average.
- Release cadence: Monthly, typically around the 15th of the month.
- Sample: ~900 single-family builders surveyed monthly, random sample of NAHB membership.
- History: Published since 1985. Long-run average ~47. 2009 trough: 8. 2021 peak: 90.
- Where to find it: nahb.org, FRED (series `HOUST`, `NAHB`), major real estate media.
How It Works
The three questions builders answer every month. NAHB sends a survey to a random sample of ~900 single-family member builders. Question 1: rate current market conditions for new single-family home sales (good / fair / poor). Question 2: rate expected conditions in the next 6 months (good / fair / poor). Question 3: rate current traffic of prospective buyers (high / average / low / very low). Responses get converted to a 0-100 index for each question. The composite HMI is a weighted average: current sales 50%, expected sales 30%, buyer traffic 20%. Results publish mid-month.
Reading the sub-indices. The composite number tells you the overall direction; the sub-indices tell you the story. HMI 34 with current sales 40, expected sales 36, buyer traffic 24 means builders are worried most about the future pipeline — traffic is weak, which predicts weak pending sales 60-90 days out. HMI 34 with current sales 30, expected sales 40, buyer traffic 40 means builders see today as rough but expect recovery. Same composite, different story. Always read the sub-indices.
Why below-50 matters. At 50, the share of builders rating conditions "good" equals the share rating them "poor." Below 50, pessimism dominates — builders are more likely to cancel or delay starts, spec-building slows, and inventory gets worked through rather than replenished. A sustained 3+ months below 50 historically precedes material drops in building permits and housing starts by 2-4 months. Above 50, optimism dominates — starts accelerate, spec homes go up, and new supply pressures prices and rents. Investors treat 50 as the key dividing line.
How HMI leads the cycle. NAHB's HMI is a sentiment indicator — it reflects builders' current read on conditions and near-future expectations. Because builders' construction decisions play out over 6-12 months, HMI is leading. A builder who feels pessimistic today delays a spec home start this month; that home doesn't complete for another 6-9 months; rental competition from that unit doesn't hit until 12-18 months out. That's the leading signal investors pay for. The NAHB survey is free; the leading-indicator insight is the edge.
Real-World Example
Ana Castillo reads the April HMI release.
Ana owns 28 rental units across Nashville and Indianapolis. The April NAHB HMI drops:
- Composite: 34 (down from 38 in March, 52 a year ago)
- Current sales: 40 (down 4)
- Expected sales (6 months): 36 (down 6)
- Buyer traffic: 24 (down 2, lowest reading since 2020)
She pulls the context. Historical average HMI is ~47. Readings below 40 historically coincide with 10-15% declines in housing starts within 6 months. Buyer traffic at 24 is particularly weak — that signals thin pending-sales pipeline in Q3.
For Ana, this is structurally good news for rental pricing. Fewer new single-family completions in Q4 2026 and H1 2027 means less inventory for move-up buyers. Move-up buyers who can't find homes remain renters longer. Her existing units face less competition from new rentals (builders build rentals too, though slower) and from move-up buyers exiting the rental market.
She doesn't treat HMI as action-demanding on its own. She cross-references:
- Census Building Permits Survey for Nashville and Indianapolis specifically — confirming the national weakness is hitting her markets
- BLS employment data — employment remains stable, so this isn't a demand-crash story
- Zillow ZHVI for her target ZIPs — rent growth is still positive year-over-year
Her read: builder sentiment is weak, but demand fundamentals remain solid. That's the classic setup for rent growth acceleration as new supply contracts but demand holds. She proceeds with an acquisition offer on a Nashville duplex she'd been eyeing.
Pros & Cons
- Longest-running builder sentiment index in U.S. housing (since 1985)
- Free, public, monthly cadence, fast mid-month release
- Leading indicator for permits and starts with consistent 2-4 month lead time
- Three sub-indices provide compositional detail beyond the composite
- Broad builder membership produces statistically robust national sample
- Sentiment, not transactions — can diverge from actual building activity
- National composite; regional data has smaller samples and more noise
- Trade-association bias can color press commentary (data itself is reliable)
- Only covers single-family builders; multifamily builders have separate sentiment surveys
- Small month-to-month changes (1-3 points) are within sample noise — don't overreact
Watch Out
- Watch the trend, not single readings: A single 2-3 point monthly drop is often sample noise. Three consecutive months of declines below the long-run average are a real signal.
- Buyer traffic sub-index is the leading edge: Of the three sub-indices, buyer traffic leads the other two. Traffic drops 1-2 months before current sales and expected sales follow. For early warning, weight traffic most.
- The 50 threshold is mechanical, not absolute: HMI at 48 isn't crisis-level — it's mildly pessimistic. HMI at 28 is crisis-level. Use the historical range (8-90) as scale.
- Regional HMI is noisy: NAHB publishes region-level HMIs (Northeast, Midwest, South, West). These have smaller samples and can swing 5-10 points between months. Use national HMI; treat regional as directional only.
- Doesn't capture multifamily: HMI is single-family only. For multifamily builder sentiment, use the NMHC Quarterly Apartment Tracker — different survey, different industry, different cadence.
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The Takeaway
The Housing Market Index is the single most-watched builder sentiment indicator in U.S. housing. Monthly, free, 40+ year history, with three sub-indices that reveal compositional detail. Below 50 signals builders pulling back — predicts tighter supply 12-18 months out, typically bullish for rents. Above 50 signals expansion — predicts more supply, typically bearish for price growth. Pair HMI with Census building permits data and housing starts to confirm that sentiment translates to actual activity. Watch the buyer traffic sub-index for earliest warnings. For commentary, NAHB's Eye on Housing blog (nahb.org) publishes alongside every release.