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Length of Time For New Residential Construction
Length of Time From Authorization of Construction to Start
For Private Residential Buildings
These tables contain annual statistics on the length of time from authorization of construction
to start of new private residential buildings in permit-issuing places. Data are obtained from the U.S.
Census Bureau's Survey of Construction. Since the Survey of Construction is designed to collect data on a
monthly basis, it can only be determined in what month a building was authorized or started rather than
the precise day. For example, buildings started on August 1 or August 31 would be counted as starting in
August. Because of this, it is assumed for this supplement that a building authorized and started in the
same month was started immediately after the permit was issued. That is, we use zero number of months in
the computation. Buildings started in the first month after authorization
took the full month to begin; those started in the second month after authorization took 2 months; those
started in the third month after authorization took 3 months, and so on. Also, since many jurisdictions
allow the ground breaking (start) to occur before the final permit is issued, there may be a negative
number of months from authorization to start. For instance, projects where the building started in the
month prior to the final permit use -1 in the computation of the length of time.
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Average Length of Time from Authorization to Start
(in PDF) (in Excel)
Percent Distribution of Buildings Started by Number of Months from Authorization (below in PDF)
Percent Distribution of Buildings Started
by Number of Months from Authorization (In Excel)
Length of Time From Start of Construction to Completion
For Private Residential Buildings
These tables contain annual statistics on the length of time from start of construction
to completion of new private residential buildings. Data are obtained from the U.S.
Census Bureau's Survey of Construction. Since the Survey of Construction is designed to collect
data on a monthly basis, it can only be
determined in what month a building was started or completed rather than the precise day. For example,
buildings started on August 1 or August 31 would be counted as starting in August. Because of this,
it is assumed for this supplement that a building started and completed in the same month took a full month
to build. Buildings completed in the first month after start took 1.5 months; those completed in the second
month after start took 2.5 months; those completed in the third month after start took 3.0 months;
those completed in the fourth month after start took 4.0 months, and so on.
Average Length of Time from Start to Completion (in PDF) (in Excel)
Percent Distribution of Buildings Completed by Number of Months from Start (below in PDF)
Percent Distribution of Buildings Completed by Number of Months from Start (In Excel)
For questions, visit our Question and Answer Center at ask.census.gov or contact the Residential Construction Branch at
(301)763-5160.
Last revised:March 17, 2009
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