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Construction permits, housing starts and construction spending measure three different stages or aspects of building activity: authorization, the beginning of physical construction, and the value of work put in place. They are not interchangeable. A permit does not prove a project has started, and spending in a month can reflect work on projects that began much earlier.
At a glance
| Metric | What it measures | Unit | Coverage | What it does not establish |
|---|---|---|---|---|
| Building permits | Permits issued for new housing units | Housing units | New residential construction reported through the Building Permits Survey | Whether excavation has begun or the project will be completed |
| Housing starts | Units crossing Census’s defined physical construction threshold | Housing units | New residential construction, including sampled areas where permits are not required | How much construction value was put in place during the period |
| Construction spending | Estimated value of construction work put in place during the period | Dollars | Public and private construction, including new work and improvements, in the 50 states and District of Columbia | How many new homes were authorized or started during the period |
The construction lifecycle behind the numbers
It helps to picture a project moving through several stages. An owner or developer first obtains authorization for new housing. That authorization appears in the permits measure when a permit office reports it. The project may then wait for financing, design changes, site preparation, weather conditions or a contractor’s schedule. Only when excavation begins for the footings or foundation does Census classify the housing units as starts. After that point, work can continue for many months. Construction spending records the estimated value of work put in place during each period, whether the work belongs to a newly started project or one that began earlier.
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These stages create an inventory between observations. Units can be authorized but not yet started, and units can remain under construction after their start has been counted. A monthly reading is therefore a flow at one stage, not a complete balance sheet of every project in the pipeline. A permit count can be strong while the stock of authorized-but-not-started units grows, for example, if excavation is being delayed. Later starts may reflect those earlier authorizations rather than the latest permit reading.
The same logic applies to spending. A start is recorded once, at the excavation threshold, while value is put in place over the construction period. A project can contribute to spending in several successive periods without adding another unit to starts. Conversely, a month with many starts may not immediately show a comparable spending increase if excavation has just begun and most of the work remains ahead.
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What does a building permit measure?
A building permit is an authorization signal: the Building Permits Survey estimates the number of permits issued for new housing units, based on reports from permit offices. It indicates that a building authority has authorized work, not that construction has begun, will proceed as authorized, or will ultimately be completed. The Census Bureau describes the survey’s coverage and collection process in its Building Permits Survey methodology.
That distinction matters when interpreting permits as a forward-looking indicator. A permit can precede excavation by weeks or months, and some authorized projects never start. A permit count therefore describes the authorization stage—not a guaranteed pipeline of homes that will be built.
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The survey depends on information supplied by permit offices. Local practices, classifications and reporting schedules can affect how an authorization enters the monthly estimate. For long time series, the Building Permits Survey target universe began annual updates with January 2023. When comparing periods across that change, verify the applicable universe, categories and geography rather than assuming every historical observation was produced under identical conditions.
A permit also does not identify the amount of work that will be performed in the reference month. It is an event in the authorization process. The eventual project could be redesigned, delayed, abandoned or built with a different apartment-unit count. Those outcomes are why permits are useful as an authorization indicator but should not be read as starts, completions or a dollar estimate.
When does Census count a housing unit as a start?
Census counts a housing unit as started when excavation begins for the building’s footings or foundation. The Survey of Construction definitions state: “Start – of construction occurs when excavation begins for the footings or foundation of a building.” This is a specific physical threshold, not a count of permits, groundbreaking ceremonies, completed foundations or finished homes.
For a multifamily building, all of its housing units are counted as started when excavation for that building begins. Thus, a single physical construction milestone can add many units to the starts measure at once. Starts are still a unit count, not a count of buildings, contractors or dollars of work performed.
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The Survey of Construction estimates starts using sampled permits and follow-up to determine the actual month construction began. It also covers sampled areas where permits are not required. That methodology helps explain why starts are not simply copied from permit records: they are intended to estimate when the defined construction event occurred. Census outlines the process in its Survey of Construction collection methodology.
Because the survey is sample based, its estimates are subject to sampling and nonsampling error. Follow-up information can also clarify that a project started in a different month than the permit month, changed its planned unit count or did not proceed. A start reading should therefore be treated as an estimate of units reaching the excavation threshold, not as a project-by-project administrative register.
Starts do not measure the pace of later work. Once excavation has occurred, the units have entered the starts count even if construction later slows, is redesigned or is abandoned. To understand later progress, analysts need the separate information about units under construction and completions rather than treating the starts series as a running construction total.
What does construction spending measure?
Construction spending is a dollar-value measure of construction put in place during a period. It includes work on projects already underway as well as work on projects that began during the period; the month a project started and the month a contractor was paid do not define the measure. Census coverage includes new construction and improvements in both the private and public sectors across the 50 states and the District of Columbia. See the Bureau’s Construction Spending definitions.
Unlike permits and starts, spending is not limited to new housing units. It includes construction across broader categories of public and private work, as well as improvements to existing structures. A rise or fall in total spending can therefore reflect activity outside residential construction, or work on existing buildings, rather than a change in newly authorized homes.
The way the dollar value is estimated varies by category. For some categories, estimates represent payments; for others, Census distributes project costs over time using historical patterns of construction progress. The result is an estimate of value put in place, not a simple tally of invoices paid that month. The Bureau explains these distinctions in its Construction Spending methodology.
“Put in place” is consequently a progress concept. It asks how much of the covered construction value is estimated to have been completed or installed during the period, using the method appropriate to that category. It is not a count of contracts signed, permits issued, workers employed or homes newly started. A large public project, an improvement to an existing building and a private residential project can all contribute to the aggregate, even though none is represented in the same way by the permits or starts series.
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Spending also cannot be used to infer a project’s remaining budget from a single monthly change. The aggregate combines projects at different stages and uses category-specific estimation procedures. A month of high value can include substantial progress on projects whose starts were recorded in earlier periods, while a month of low value can occur even when authorization activity is high but physical work has not yet advanced.
Why don’t permits, starts and spending move together?
They track different things at different points in the construction lifecycle, so they can move in different directions without contradicting one another. Permits record authorization, starts record a physical threshold, and spending estimates the value of work during a period across projects underway.
Imagine a month in which many housing units receive permits, but excavation is delayed. Permits can rise while starts do not yet reflect those projects. If other construction projects are progressing at the same time, spending may rise even though starts are flat. Conversely, a project can be counted as started at excavation and generate construction value across later periods, so the start count and spending need not peak together.
Projects can also be abandoned before construction starts or after work has begun. Plans can change, including the number of apartment units, and permit-office classifications may differ from classifications made by survey field representatives. Census documents these factors, along with the effect of units authorized but not yet started and units still under construction, in its overview of how the New Residential Construction surveys relate.
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The coverage difference is just as important as timing. Permits and starts in the New Residential Construction series concern new housing units. Construction spending covers a wider range of public and private work, including improvements to existing structures. Comparing their raw totals as if they describe the same inventory would be an apples-to-oranges comparison.
Common divergence patterns
- Permits up, starts flat: authorizations may be accumulating while developers wait to excavate, or some permits may never turn into construction.
- Starts up, spending modest: many units may have just crossed the excavation threshold, while most of their construction value will be put in place in later periods.
- Spending up, starts flat: ongoing residential, commercial, public or improvement projects can add value without any corresponding increase in newly started housing units.
- Starts and permits differ in unit totals: a redesign, abandonment or a changed apartment count can alter the relationship between the authorization record and the field-based start estimate.
- Short-term reversals: preliminary readings, seasonal patterns and later revisions can change the apparent direction of a month-to-month comparison.
None of these patterns alone identifies which series is “right.” Each can be consistent with its own definition and coverage. The useful question is what event occurred, which projects are included and where those projects sit in the lifecycle.
How should you compare the three metrics?
Before drawing a conclusion, check that you are comparing the same stage, unit, coverage, geography, reference period and data status. A divergence can be a useful clue about timing or scope, but by itself it does not show that one series is wrong.
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- Identify the question. For authorization of new housing, look at permits. For the point when physical construction reaches Census’s start threshold, look at starts. For the value of work put in place across a broad construction scope, look at spending.
- Check the unit. Permits and starts count housing units; spending reports dollar value. Do not compare a dollar change directly with a unit-count change as though they were equivalent quantities.
- Match the scope. Confirm whether you need new residential construction or all covered public and private construction, including improvements. A broad spending total cannot be treated as a housing-only measure.
- Align geography and categories. Ensure the geography and construction categories match the question. The measures do not automatically share identical coverage simply because they all concern construction.
- Align the period and adjustment basis. Compare the same reference month or period, and note whether a figure is seasonally adjusted or not. If adjustment bases differ, apparent month-to-month divergence may not be a like-for-like comparison.
- Check whether values are preliminary or revised. Survey estimates can change as additional information is incorporated. Use the release status and revision schedule when comparing recent readings with older ones, rather than treating preliminary values as final.
- For long histories, check for methodology changes. The Building Permits Survey began annual updates to its target universe with January 2023. Changes in universe, categories, geography, seasonal adjustment and release or revision status can affect comparisons across distant periods.
- Track the inventory between stages. If possible, examine authorized-but-not-started units and units still under construction. Those stocks help explain why a permit flow does not immediately appear in starts or why starts continue to feed spending later.
- Separate signal from precision. Treat sample-based estimates and preliminary values as measurements with uncertainty. Avoid turning a small one-month difference into a claim about the entire construction cycle.
Census estimates from the Survey of Construction are sample-based and subject to sampling and nonsampling error. That is another reason to interpret the indicators as estimates with defined coverage, not as exact counts of every project. Methodology and revision details are available in the Bureau’s Survey of Construction documentation.
What can each metric tell a builder or analyst?
The useful measure depends on the decision. Permits can help describe housing authorization activity, while starts show when projects cross a defined early construction milestone. Spending helps describe the dollar value of work being put in place across a much broader construction universe.
For a residential pipeline question, permits and starts are complementary rather than competing measures: permits indicate authorized units, and starts indicate units for which excavation has begun. Neither alone tells you how much work has been completed, what remains under construction, or whether the units will be delivered. For a broad market-activity question, spending captures value across ongoing projects and improvements, but it cannot be read as a count of new homes beginning construction.
For a local housing analyst, permits may be the earliest of these signals, but the lag to excavation is not fixed and the authorization may not be realized. Starts provide a more concrete indication that work has crossed the Census threshold, yet they still say nothing about the project’s later pace. For a contractor, supplier or materials analyst, spending can be relevant to the amount of work being put in place across sectors, but the aggregate does not identify a particular customer, site or product order.
For public-sector or infrastructure analysis, spending is the relevant broad measure because its coverage includes public construction and improvements. A change in that series should not automatically be labeled a change in homebuilding. Conversely, a housing permit or starts trend can change while total spending remains steady if nonresidential or public work offsets residential movements.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIn practical terms, choose the series that corresponds to the event you want to understand, then use the others as context. If permits rise while starts lag, the difference may reflect timing or projects that will not proceed. If spending moves differently from starts, first consider the wider coverage and ongoing work captured in the spending estimate before treating the relationship as a signal about new housing alone.
What these measures cannot answer by themselves
None of the three series is a complete measure of construction health. Permits cannot establish starts or completions. Starts cannot show the dollar cost already put in place or the amount still required. Spending cannot reveal how many housing units generated the value, which projects are delayed, or whether a specific development is on schedule. Questions about project-level progress, remaining costs, delivery dates or contractor performance require records outside these aggregate estimates.
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They also do not provide a single, direct measure of employment, prices or productivity. A dollar increase in spending can reflect more work, changes in the mix of projects or other factors, while a unit increase in starts can represent projects of very different sizes and designs. Those interpretations require additional data and should not be inferred from the three indicators alone.
FAQ
Frequently Asked Questions
Can construction spending tell me whether a specific project is progressing?
No. The Census spending series is an aggregate estimate across covered construction categories, not a project-level progress tracker. A project owner needs project-specific schedules, cost reporting or other records to assess an individual job.
Does a higher permit count mean more buildings are being built?
Not necessarily: the measure counts authorized housing units, not buildings. A multifamily building can account for many units, and some permits may never lead to a start.
Can I use construction spending as a count of new homes?
No. Spending is expressed in dollars and includes public and private construction work beyond new housing, including improvements to existing structures. Use housing-unit counts when the question is how many units were permitted or started.
Is a permit the same as a housing start?
No. A permit is authorization reported by a permit office. Census counts a start when excavation begins for the footings or foundation, and that event can occur later—or never occur if the project is abandoned.
When exactly does Census record a multifamily start?
All housing units in a multifamily building are counted as started when excavation for that building’s footings or foundation begins. One physical excavation event can therefore add many units to the starts estimate.
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Permits show authorization for new housing units, starts show when excavation for footings or a foundation begins, and construction spending shows the estimated dollar value of work put in place across ongoing public and private projects. Compare them only after matching stage, unit, scope, geography, period and data status.

