How long does it take to build a house in Wake or Johnston County?

There's no single number, but public figures give you a frame. In the South, a house built on the owner's land by one general contractor took an average of 9.0 months from first digging to finished in 2025, according to the Census Bureau, with about a month and a half from permit to start. On a lot that needs a septic system or well, the county health review comes before the building permit.

No source adds the whole journey into one total, and the Census numbers don't count time spent finding land, closing or designing the house. So it helps to think in stages.

How long does the building itself take?

The Census Bureau's Survey of Construction publishes yearly averages for two stretches: from building permit to start, and from start to finished house. Its definitions say a house "starts" when digging begins for the footings or foundation. It counts as completed when all finished flooring is in, or when someone moves in, if that happens first.

Census has two groups for houses on the owner's land. "Contractor-built" means the owner will live there and one general contractor runs the job. "Owner-built" means the owner acts as the general contractor. North Carolina falls in the Census "South" region.

For the South in 2025, the Census start-to-completion table shows these averages:

• 9.0 months for contractor-built houses
• 10.8 months for owner-built houses
• 5.5 months for houses built for sale
• 6.6 months for all single-family houses

The contractor-built figure has moved around: 7.7 months in 2019, 9.1 in 2022, 9.8 in 2023 and 9.1 in 2024. Nationally, it was 10.5 months in 2025. These are regional averages, not a promise for any one house. Census also counts in whole and half months: a house started and finished in the same month counts as a full month, and one finished the next month counts as 1.5.

From permit to start, the Census table shows 1.5 months for contractor-built houses in the South in 2025. Census notes that many places let digging start before the final permit, so some houses count a negative number of months.

What has to happen before the building permit?

If your lot will have a well or septic system, the health side goes first. In Wake County, Onsite Water Protection checks whether the site works. If it does, it issues a Construction Authorization, or CA, and only then can the building permit be issued. An unsuitable lot goes to denial and appeal.

Johnston County Planning lists these building permit steps for unincorporated areas:

1. Get a site address.
2. Get a well/septic permit if the lot will have a well, or apply for county water if not.
3. Get a zoning permit, a site plan and the Residential Plan Review and Permit Application.
4. Send everything to Building Inspections.

In unincorporated Wake, you apply for a new home in the county's Permit Portal with a site plan and building plans. Septic and well each need their own permit. A land disturbance permit is required for any lot in a subdivision, and for lots outside one that disturb more than 1 acre. A Watershed Management review ($50 each) may be needed in flood hazard areas or where paved and built-over area runs above the allowed limit. Wake's septic FAQ says lots inside towns start with the wastewater permit in the portal.

Both counties ask for a lien agent appointment: Johnston on its application, Wake for projects of $40,000 or more. A real estate attorney can explain what that involves.

How long do the county reviews take?

Johnston septic and well. The Environmental Health office says its "response time is 5 weeks or less as of September 16th, 2026." Call (919) 989-5180 for the current wait.

Johnston building plans. The county's two offices give different times. Planning says to "Allow 7 to 10 business days for review." The Building Inspections FAQ says approval takes "about two and a half weeks" once everything is in. You can't apply online; bring or mail the application.

Wake septic. Wake doesn't post a fixed number. Its septic permitting page links to a live dashboard of turnaround times.

State rule for plan review. Under G.S. 160D-1110, a city or county that reviews house plans must finish the first review within 15 business days. If it takes more than 20, it refunds 10% of the permit fee for each extra business day, for up to 10 days. That review must run alongside other required approvals.

Thinking of acting as your own contractor? Johnston's FAQ says you must own the property and live there at least 12 months in a row after the final inspection, and a licensed general contractor is required for any job over $40,000. Wake requires a notarized affidavit when an owner is listed as general contractor on a project of $40,000 or more.

What can slow things down near the end?

On a Wake well, a certified contractor drills and calls for a grout inspection. After the pump goes in, the wellhead inspection must be requested within 72 hours, and water samples must pass before the certificate of occupancy, the go-ahead to move in.

Wake lists these waits: samples taken 3 to 5 business days after the request if no chlorine is left, bacteria results in about 48 to 72 hours, nitrate and several other tests in about 2 weeks, and gross alpha tests in 3 to 4 weeks, with "a 1 in 7 chance of requiring treatment and re-testing."

On septic lots, Wake gives temporary "conditional power" only when the system needs a pump; the house must pass its final electrical inspection first, and it lasts 60 days.