Production homes in the Boise area typically take 6 to 8 months from groundbreaking to closing. Semi-custom homes take 8 to 12 months. Fully custom homes take 12 to 18 months, sometimes longer for complex or larger builds. These ranges exclude the design and permitting phase, which adds 2 to 6 months for custom builds. Most 2026 builds in the Treasure Valley are completing in roughly historical norms, with supply chain disruption from the 2021 to 2023 period having largely stabilized.
"How long will it take?" is the second question most new construction buyers ask, right after "how much will it cost?" The honest answer depends on the category of builder, the complexity of the home, the jurisdiction's permitting backlog, the season, and the buyer's own selection discipline. Here is what actually drives the timeline, what each phase really takes, and what makes builds in the Boise area run long.
The Three Categories — Realistic Ranges
The ranges above are from groundbreaking to closing. They do not include design and permitting time, which for custom builds typically adds another 2 to 6 months on the front end. The difference between the three categories is explained in detail elsewhere — and it directly drives the timeline differences.
Within each category, where a specific build falls in the range depends on home size, complexity, selection discipline, weather, jurisdiction, and the builder's specific process.
Phase by Phase — A Production Build Timeline
For a typical production home in the 2,000 to 2,800 square foot range in the Boise market, here is the phase breakdown most builds follow. Adjust upward for larger homes, more complex designs, and semi-custom or custom builds.
Site Work & Foundation
Lot clearing, grading, excavation, footings, foundation pour, and waterproofing. In Ada and Canyon Counties, most production builders complete site prep and foundation in 2 to 3 weeks under good conditions. Winter foundation work (December through February) adds 3 to 7 days for cold-weather concrete protocols.
Framing
Floor system, wall framing, roof framing, sheathing, and house wrap. Framing typically takes 3 to 5 weeks. A well-coordinated framing crew can complete a 2,500 square foot production home in about 3 weeks; complex roof lines, vaulted ceilings, and multi-story builds run longer.
Mechanical Rough-In
Plumbing, electrical, HVAC ductwork, and low-voltage wiring all run in parallel within the framed walls. This phase requires coordination between trades and includes the pre-drywall inspection by the jurisdiction. This is the phase to do a pre-drywall walkthrough.
Insulation & Drywall
Insulation installation, drywall hanging, taping, mudding, and texture. About 2 to 3 weeks for a standard production home. Drywall must dry between coats, which is the rate-limiting step. Once drywall is complete, the home is "dried in" and progress feels faster.
Finishes
Paint (primer + 2 coats), trim, interior doors, cabinets, countertops, flooring, tile, plumbing fixtures, light fixtures, and built-ins. This is the longest single phase — 6 to 8 weeks even on a production home — and the phase where timeline slippage most commonly occurs. Cabinet delivery delays are the most predictable cause of slippage.
Final Mechanical & Appliances
Trim-out of electrical (outlets, switches, fixtures), final plumbing (toilets, faucets, water heater connections), HVAC commissioning, and appliance installation. Final inspections from the jurisdiction occur at this stage.
Punch List, Walkthrough & Closing
Final cleaning, exterior detail work, landscaping (if specified), the pre-close walkthrough, builder punch list completion, certificate of occupancy from the jurisdiction, and final closing. The walkthrough sequence determines what is documented and addressed before closing.
Total for a production home in the Boise area: roughly 24 to 30 weeks, or 6 to 7 months, under good conditions. Add 2 to 4 weeks for typical real-world friction.
Where Semi-Custom and Custom Builds Add Time
Semi-custom and custom builds follow the same phase structure but each phase takes longer because the work is more complex and less repetitive.
Semi-Custom adds time at:
- Framing — modified plans take longer than standard plans because the crew is not building from muscle memory.
- Finishes — a wider selection of cabinets, counters, tile, and flooring means more vendor coordination and longer lead times.
- Inspections — non-standard plans sometimes require additional review by the jurisdiction.
Custom builds add time at:
- Design and permitting — 2 to 6 months before construction even starts.
- Every phase — each phase is bespoke. The framing crew is reading plans for the first time. The plumber is figuring out the right approach for a unique layout. The finish trades are working with materials the builder has never installed before.
- Selections — the buyer is making far more decisions than in production or semi-custom, and the build can pause when selections are not made on schedule.
- Inspections and rework — first-time builds tend to have more inspection corrections than repeated production plans.
A custom build that takes 14 months from groundbreaking to closing is not delayed — that is the normal range. A custom build that closes in 9 months either had unusually disciplined selections, was a smaller and simpler home than typical, or was rushed in ways the buyer may regret at the walkthrough.
"Most timeline slippage in new construction is created by the buyer. The selections that don't happen on time, the changes made after framing, the deliberation that pauses the next trade — those are buyer-caused. The good builders absorb it. The great builders flag it before it becomes a delay."
The Permitting Question — Ada vs. Canyon County
Permitting timelines vary by jurisdiction in the Treasure Valley. For most production builders, permitting is handled before the buyer is under contract — the builder pulls permits at scale as part of community development. For semi-custom and custom builds, permitting timing varies:
- City of Boise — generally the most rigorous review in the valley, with longer wait times than smaller jurisdictions.
- City of Meridian — large permit volume, streamlined processes for production builders, longer for custom plans.
- City of Eagle — design review for many areas (especially foothills districts), can add weeks to the permitting timeline.
- City of Kuna — generally faster than the urban Ada County cities for similar permit types.
- Canyon County jurisdictions (Caldwell, Nampa, Star) — typically faster permitting than Ada County, with less design review.
- Unincorporated Ada and Canyon County — different process through county building departments; timelines vary substantially.
For any specific build, the actual permitting timeline depends on current backlog, completeness of the submitted plans, whether design review is triggered, and the jurisdiction's current staffing. Builders typically have working relationships with permit departments and can provide realistic estimates.
What Causes Real Delays
Listed roughly in order of frequency in the current Boise market:
- Late buyer selections. The single most common cause of delay. The design studio sets a selections deadline; the buyer misses it; the next trade can't be scheduled; a week becomes two; two becomes four.
- Change orders after framing. Anything changed after the framing inspection cascades into rework. Moving an outlet costs an hour. Moving a wall costs three weeks.
- Permit corrections. Plans submitted with errors get returned for correction. Each round of correction can add 1 to 4 weeks.
- Weather. Foundation work in deep cold, exterior painting in heavy rain, roofing in windy conditions, landscaping at the wrong time of year. Most Idaho weather affects 1 to 5 days at a time, but those add up.
- Cabinet lead times. Custom or semi-custom cabinets routinely have 8 to 14 week lead times. A late selection means a late delivery means a delayed finish phase.
- Trade scheduling. Subcontractors juggle multiple builders. If one trade slips, the next trade gets rescheduled to whenever there is an opening, which can be weeks out.
- Inspection failures. Each failed inspection adds time for rework and re-inspection. Production builds rarely fail; semi-custom and custom occasionally do.
- Supply chain. Largely stabilized in 2026 compared with 2021 to 2023, but specific items — premium appliances, custom windows, specialty fixtures — still carry long lead times.
The biggest single thing a buyer can do to keep a build on schedule is to make every design studio selection on or before the deadline. The second biggest is to avoid change orders after framing. The third is to respond quickly when the builder asks for a decision during construction.
Realistic Expectations vs. Marketed Timelines
Builders quote timelines in two ways. The marketed timeline is the best-case scenario — the one the builder hopes to hit. The contractual timeline includes more buffer and incorporates delay tolerances. The actual timeline tends to land somewhere between the two.
A reasonable buyer expectation:
- Production: If quoted 6 months, plan for 7. If quoted 7 months, plan for 8.
- Semi-custom: If quoted 9 months, plan for 10 to 11.
- Custom: If quoted 12 months, plan for 14 to 16.
This is not pessimism. It is what nearly every well-run builder in the Treasure Valley will privately tell a buyer to plan for, separate from what their sales process initially quotes. Builders quote tight timelines because tight timelines win contracts. Reality has more friction than the sales conversation acknowledges.
For buyers who absolutely must close by a specific date — school year, lease expiration, job start — production is the only category to consider, and even production should be started with at least 30 days of buffer between the quoted closing date and the must-have date.
The Bottom Line
Six to eight months for production, eight to twelve for semi-custom, twelve to eighteen for custom. Add buffer to each. Make selections on time. Avoid change orders after framing. Pick a builder whose process you trust to flag issues before they become delays.
A new build is a yearlong project at minimum for anything beyond strict production. That is not a problem to solve — it is the nature of building a home. The buyers who navigate it well are the ones who set realistic expectations from the start, stay disciplined on their own decisions, and use the time to understand the contract and prepare for the walkthroughs that determine what they actually receive at closing.