Most of the delay on a custom home in Austin lands before anyone breaks ground, and it lands on whoever assumed a stage was finished when it was not. The City of Austin will not review plans it cannot accept, and will not permit a lot it cannot legally serve.
The lot has to be a legal lot first
Before a design is worth drawing, confirm the tract is a legal, platted lot. The City of Austin's subdivision application process page states that state law prohibits connecting utility services to a lot that is not legally platted, and that the Land Development Code requires subdivision approval to precede the issuance of a building permit. A tract carved out of a larger parcel and never recorded is not ready to build on, whatever the deed says.
There is an exception route. A Land Status Determination exempts an unplatted or illegally platted tract from the state platting requirements, and the City says staff email the applicant within ten business days with an approval or a denial. Check the property's permit history at the same time: the City lists resolving every expired permit as a step before a new application, which is what catches a lot that carried an earlier, abandoned project.
The design is finished before the application, not during review
The City reviews what you submit and nothing else, so the drawings have to be complete before the application goes in. Austin's Residential Plan Review Division covers new construction of single-family houses, and its technical review looks at framing, bracing and foundation plans. Plans not sealed by a Texas-registered architect or certified building designer get only a limited technical review, which the City says is not intended to be exhaustive of all possible building code requirements.
The design also has to match the code in force. The City's building technical codes table lists the 2024 International Residential Code and the 2024 International Energy Conservation Code as adopted, and a new dwelling unit with habitable space on the first floor must comply with the City's Visitability Ordinance. Where drawings cannot settle a question, the City requires a Preliminary Plan Review meeting for any pre-application consultation needing more than 20 minutes.
What plan review takes, and what adds reviewers
Residential Plan Review publishes its own clock. Starting July 1, 2026 the City lists 10 business days for new construction and additions and 7 business days for update submittals, and the review time starts when you pay the invoice, not when you apply. If reviewers return a Master Comment Report, every rejection comment has to be cleared before approval, and the City says you may have to repeat that step.
How many departments read the plans is decided by the lot. The City lists the triggers:
- A tree 19 inches or greater in diameter, on or adjacent to the property, pulls a tree review.
- A structure over 3,600 square feet of total gross building area pulls a fire review, as does a site within 200 feet of a hazardous pipeline or inside the Wildland Urban Interface.
- Property inside the City's 100-year floodplain, or within 100 feet of its boundary, pulls a floodplain review.
- Land within 100 feet of the centerline of a creek or stream bed pulls an erosion hazard zone review.
- A structure 45 years or older whose exterior is demolished or modified pulls a historic review.
- A new driveway approach in the right-of-way pulls a transportation review, a new utility tap pulls Austin Water, and a property on septic pulls an on-site sewage facility review.
Each is a separate reviewer with its own queue. The City makes the point in a footnote to its volume builder program: a participating builder's shortened review time reverts to the standard new construction time as soon as a tree or fire review is required.
A registered contractor activates the permit
An approved plan is not yet a permit. The City requires general contractors, trade contractors and homeowners acting as contractors to register with Building and Trade Contractor Services before any construction begins, and says work and inspections can start only once a contractor is registered and assigned to the permit.
The general contractor assigned to that permit activates it, performs the work as approved, manages the trade permits underneath it, schedules the final building inspection and obtains the Certificate of Occupancy. One line on the same City page is worth reading before you choose anyone: in Texas, anyone can be a general contractor, including homeowners, and a state license is not required. The vetting is on you. Alpha Construction registers and carries the permit as part of a custom home build, in Austin and in Cedar Park, Round Rock and Pflugerville, where the requirements are not the City of Austin's.
Construction runs on inspections and ends with a Certificate of Occupancy
From permit activation the build runs as a sequence of inspections rather than one stretch of uninterrupted work. The trade contractors assigned to the mechanical, electrical and plumbing permits activate and schedule their own inspections, including their final trade inspections, while the general contractor schedules the final building inspection.
Occupancy is the last gate. The City issues a Certificate of Occupancy after a successful final inspection on new construction, and Austin has required residential buildings to hold a CO for their current use since 1931. Where a house is finished enough to live in but not signed off, a Temporary Certificate of Occupancy may allow it to be occupied before the final one is issued.
How long the whole sequence takes
National figures are the honest answer, because the federal series does not break this out for Central Texas. The U.S. Census Bureau's Survey of Construction puts the 2025 average from start to completion for a contractor-built single-family house at 10.5 months, against 6.1 months for a house built for sale and 12.8 months for an owner-built house. A companion table in the same survey adds an average of 1.4 months between authorization and start.
Those are national averages across permit-issuing places, not a schedule for a particular house. Your number moves with the lot, the size and complexity of the design, how fast selections get decided, and which reviews your site pulls. That belongs on paper at the consultation, before anything is signed.
What to have ready before you call a builder
Bring the deed and the plat or subdivision name, a survey if one exists, whether the lot is on City water and sewer or on septic, and the rough size of the house you have in mind. With those, a builder can tell you on the first site walk which reviews your lot will pull and what is still missing. Hold everyone to the Federal Trade Commission's rule on paperwork too: a written estimate should include a description of the work, the materials, a completion date and the price.
Alpha Construction builds ground-up custom homes across Austin and Central Texas, documents every job with photos from start to finish, and returns calls within two hours during business hours. Call 737-235-2776 or book a consultation and we will walk the lot with you.
Published Sep 23, 2026