The NAHB/Wells Fargo Housing Market Index measures U.S. single-family builder sentiment using weighted current-sales, expected-sales, and buyer-traffic components.
The Housing Market Index (HMI) is a monthly measure of U.S. single-family home-builder sentiment produced by the National Association of Home Builders (NAHB) under the NAHB/Wells Fargo name. It combines builders’ assessments of present new-home sales, expected sales over the next six months, and prospective-buyer traffic into an index from 0 to 100.
The HMI measures survey responses, not houses sold, construction starts, permits issued, mortgage applications, home prices, or builder profits. A reading above 50 means positive responses outnumber negative responses under the index formula. It does not mean that 50% of builders are confident or that the housing market grew by 50%.
0.5920 for present sales, 0.1358 for expected sales, and 0.2722 for buyer traffic.The HMI summarizes how participating builders view the market for newly built single-family homes. It has three components.
| Component | Survey question | Response scale | Composite weight |
|---|---|---|---|
| Present sales | Conditions for current new single-family home sales | Good, fair, or poor | 0.5920 |
| Expected sales | Conditions expected over the next six months | Good, fair, or poor | 0.1358 |
| Buyer traffic | Traffic of prospective buyers | High to very high, average, or low to very low | 0.2722 |
The first component has the greatest effect on the composite. The forward-looking sales component receives the smallest weight. Buyer traffic occupies the middle.
The HMI is not a direct measure of:
Builders answer using their market experience and expectations. Those perceptions can contain useful information, but they remain survey evidence rather than transaction or production counts.
Each component uses a diffusion-index formula. For present and expected sales, let:
The component score is:
For buyer traffic, the same structure uses the percentage rated high or very high minus the percentage rated low or very low.
Suppose builders respond to the present-sales question as follows:
| Response | Share |
|---|---|
| Good | 35% |
| Fair | 45% |
| Poor | 20% |
The present-sales component is:
The reading is above 50 because good responses exceed poor responses by 15 percentage points. It does not mean 57.5% of builders answered good; only 35% did in this example.
The formula produces several useful boundaries:
Moving one percentage point of responses from negative to positive raises the component by one full point. Moving one point from neutral to positive raises it by half a point because the positive-minus-negative gap increases by one point.
Neutral responses are not separately added to the formula. They still matter because response shares sum to 100% and a shift into or out of the neutral category changes the positive or negative share.
NAHB applies fixed weights to the three component indexes:
Where:
The weights sum to 1.0000.
Assume the seasonally adjusted components are:
| Component | Index reading | Weight | Weighted contribution |
|---|---|---|---|
| Present sales | 42 | 0.5920 | 24.8640 |
| Expected sales | 48 | 0.1358 | 6.5184 |
| Buyer traffic | 30 | 0.2722 | 8.1660 |
| Composite | 39.5484 |
The calculated HMI is about 40 after rounding:
A simple average of the three readings would be 40, which happens to be close in this example. That coincidence should not be used as the method.
For a clearer contrast, consider components of 50, 60, and 40:
The correct result is approximately 49, not 50. Present sales has more influence than expected sales, so equal weighting is wrong.
NAHB states that the builder panel is stratified by region and builder size. The panel is refreshed annually to support response rates and balanced participation across the country.
The core survey has been conducted monthly since January 1985. The national HMI and its components are seasonally adjusted so recurring calendar patterns do not dominate month-to-month interpretation.
Seasonal adjustment does not convert sentiment into objective market activity. It also does not remove every effect from weather, holidays, financing changes, respondent composition, or unusual events.
NAHB publishes regional HMI history for the Northeast, Midwest, South, and West. Regional readings are commonly shown as three-month moving averages.
A moving average reduces month-to-month noise but also creates lag and overlapping observations. Compare national monthly readings with regional moving averages only after recognizing the different presentation. Broad Census regions can also conceal substantial differences among states and local markets.
The composite gives a compact view of overall builder sentiment. Above 50 means positive responses exceed negative responses on balance under the weighted methodology; below 50 means negative responses dominate.
Do not label every reading below 50 a housing recession or every reading above 50 a boom. The index is bounded sentiment evidence, and the economic meaning depends on its level, direction, components, history, and surrounding data.
A change from 36 to 39 is a three-point increase, not an 8.3% increase in home sales. The index is not a quantity series, so percentage-change language can be misleading.
Prefer:
The HMI increased three points to 39.
Avoid:
The housing market grew 8.3%.
Present sales, expected sales, and traffic can move differently. A stable composite can hide weaker current sales and stronger expectations, or stronger current conditions and weaker traffic.
Because present sales carries the largest weight, it usually has the greatest mechanical effect on the composite for the same one-point component move.
Review several months and the same period in prior years rather than treating one release as a trend. Changes near the 50 balance point may attract attention, but a threshold crossing can be only one point and should not replace component analysis.
Monthly releases may report price reductions, sales incentives, affordability concerns, material costs, labor conditions, or other special questions. These findings can explain builder behavior, but they are not fourth or fifth components of the HMI unless NAHB changes the published methodology.
Use the HMI alongside permits, single-family starts, completions, new-home sales, mortgage applications, inventory, prices, and builder-company data. Agreement across measures strengthens an interpretation; divergence identifies a question to investigate.
| Indicator | What it measures | Timing or scope | Main distinction from HMI |
|---|---|---|---|
| Housing Market Index | Builder sentiment about sales and buyer traffic | Monthly; U.S. single-family builder panel | Survey perceptions |
| Building permits | Authorized qualifying residential construction | Before construction starts | Administrative or survey-based authorization activity |
| Housing starts | Beginning of qualifying residential construction | Construction event | Physical production activity |
| New Home Sales | Contracts or deposits for qualifying new single-family houses | Can precede construction or closing | Buyer commitments, not sentiment |
| Existing Home Sales | Completed resale transactions | At closing | Mostly previously owned housing |
| Mortgage applications | Covered purchase and refinance applications | Early financing stage | Financing demand, not builder responses |
| House Price Index | Price change under a specified methodology | Usually monthly or quarterly | Price movement, not sales conditions |
| Absorption rate | Pace at which defined inventory sells or leases | Local, project, or market-specific | Inventory velocity |
The HMI focuses on newly built single-family housing. It should not be used as a sentiment measure for the full multifamily, office, retail, industrial, or existing-home market.
Assume a monthly release shows these illustrative readings:
| Measure | Prior month | Current month | Change |
|---|---|---|---|
| Composite HMI | 41 | 43 | +2 |
| Present sales | 45 | 47 | +2 |
| Expected sales | 50 | 54 | +4 |
| Buyer traffic | 28 | 27 | -1 |
The correct initial reading is that overall builder sentiment improved modestly. Current sales and six-month expectations strengthened, while prospective-buyer traffic weakened slightly.
It would be unsupported to conclude that:
The expected-sales component improved most, but expectations can change before projects begin or homes sell. The traffic decline could reflect affordability, weather, seasonality not fully captured, limited inventory, buyer hesitation, or other conditions. The release alone does not identify causation.
The next checks should include:
Public home builders generate cash flow through land development, construction, sales, and closings. HMI direction can provide industry context for orders and buyer traffic, but company results also depend on geographic mix, price point, community count, incentives, cancellation rates, construction cycle, land basis, and financing.
An improving HMI does not guarantee higher revenue or margin for a specific builder. A company may gain orders by increasing incentives or reducing prices, which can support volume while pressuring profitability.
Banks and other lenders can use builder sentiment as one macro input when evaluating acquisition, development, and construction exposure. Loan underwriting still requires project-level evidence such as presales, absorption, remaining cost, interest reserve, borrower equity, collateral value, completion risk, and local competing supply.
Manufacturers, distributors, brokers, and service providers may compare HMI direction with starts and builder orders. The sentiment index can move before procurement or revenue, but timing and customer mix differ by company.
Builder responses can react quickly to mortgage rates, credit availability, labor, materials, lots, regulation, and buyer affordability. Analysts can use the HMI as timely qualitative evidence about the transmission of financial conditions into residential construction.
It remains one survey. Monetary-policy or economic conclusions require broader evidence from inflation, employment, household income, credit, construction, sales, and financial markets.
Potential influences include:
The index does not isolate each factor’s causal contribution. Builders may face several offsetting conditions in the same month.
Before using an HMI release, verify:
Housing Market Index data are educational market evidence, not personalized mortgage, property, securities, tax, legal, or investment advice. Verify the current NAHB methodology and release before making a financial decision.