Boise is changing quickly enough that a construction site you drove past six months ago may look completely different today.
Some of the biggest projects underway in 2026 are reshaping Boise’s airport, health-care infrastructure, semiconductor industry, downtown streets, housing supply, and future growth areas.
Others are still in the proposal or planning stage, meaning the final version could change significantly before construction starts.
Here are the major Boise projects worth watching as of September 2026.
1. Micron’s Massive Boise Semiconductor Expansion
Micron’s expansion in Southeast Boise is easily one of the largest development projects underway in the region.
The company is building two leading-edge memory fabrication facilities next to its existing Boise research and development campus. Micron says the Idaho investment is expected to create more than 17,000 jobs, including direct Micron positions and related jobs in the broader economy.
Construction on the first fab has already hit major milestones, including cleanroom preparation during spring 2026. Micron currently expects DRAM production from the first Idaho fab to begin in 2027.
The company also opened a new 60,000-square-foot training center in Boise in August 2026 to prepare workers for advanced semiconductor manufacturing.
Micron representatives have also indicated that construction on the second fab is expected to begin later in 2026.
Track Micron’s Boise expansion at Micron.
Why it matters
jobs
housing demand
traffic
infrastructure
workforce training
Southeast Boise development
regional semiconductor suppliers
This project is much bigger than another office building. Micron’s expansion could influence Boise’s economy and growth patterns for years.
2. Boise Airport Expansion
Boise Airport is in the middle of a major multi-year expansion.
The city’s adopted 2026 budget includes significant airport capital spending for airfield work, infrastructure upgrades, baggage-system improvements, and early work toward a new Concourse A.
The airport’s consolidated rental car facility was expected to be completed in 2026, while the future Concourse A is targeted for completion around 2030.
Boise also received major FAA funding in 2026 for runway reconstruction and additional airport-capacity improvements.
Why it matters
Boise Airport has become one of the clearest indicators of Treasure Valley growth. More gates, improved baggage handling, expanded rental-car capacity, and airfield work all support a larger passenger base.
For residents, that means a better airport eventually. For the next few years, it also means a lot of construction.
3. St. Luke’s Downtown Boise Expansion
St. Luke’s is also in the middle of one of Boise’s largest construction projects.
The broader Boise hospital expansion is estimated at roughly $1.1 billion and passed a major milestone in June 2026 when crews topped out the new tower.
The project includes a new hospital tower and medical office pavilion as part of a development covering more than 1 million square feet.
St. Luke’s says the new nine-story tower is expected to include more than 850,000 square feet of patient-care space, approximately 80 additional beds, and seven new operating rooms. Full completion is targeted for late 2029, with patients expected in 2030.
See current project information at St. Luke’s.
Why it matters
This expansion will significantly change the northeastern edge of downtown Boise and affect health-care capacity, employment, traffic, parking, and nearby development.
Anyone regularly driving around Fort and Bannock should probably expect construction to remain part of the landscape for a while.
4. New Downtown Boise YMCA
The new CapEd Downtown Boise YMCA is under construction at 1050 W. State Street.
The project replaces the YMCA’s older downtown facility with a new building designed around fitness, courts, training space, youth programs, accessibility, and specialized programming.
The YMCA has described the facility as the anchor of a larger multi-block redevelopment concept near downtown and the North End.
The organization has said it expects the new facility to open in 2026, although large construction schedules can move.
Follow the project at Treasure Valley Family YMCA.
Why it matters
This project sits in an unusually important location between downtown, Boise High School, the North End, and the Idaho State Capitol.
Its impact is likely to go beyond the YMCA building itself.
5. Downtown 8th Street Improvements
Boise’s 8th Street project remains one of the most visible street-level changes downtown.
The final 2026 phase involves the blocks between Main Street and Bannock Street and includes geothermal infrastructure, pedestrian improvements, accessibility upgrades, and changes intended to make the corridor safer for biking and walking.
Current project information points to completion around late November 2026.
See current construction updates from Downtown Boise Association.
Why it matters
8th Street is one of Downtown Boise’s busiest restaurant and pedestrian corridors.
Construction is inconvenient now, but the long-term changes could affect how people move between restaurants, shops, The Grove, and surrounding downtown blocks.
6. Hillcrest Apartments on the Boise Bench
One of Boise’s newest visible construction projects is taking shape at the Hillcrest Shopping Center.
Crews are working on a planned 108-unit apartment project at Phillippi Street and Overland Road. The site was previously occupied by part of the old Hillcrest Shopping Center and had remained vacant for years.
Why it matters
This is exactly the kind of infill project Boise is likely to see more often.
Instead of expanding onto undeveloped land, an underused commercial site is being converted to housing.
For more context on the area, see The Ultimate Guide to the Boise Bench.
7. 27th & Fairview Apartment Proposal
One of the largest proposed housing projects near Downtown Boise is back in play.
Urban Capital Partners has proposed a three-building development at 27th Street and Fairview Avenue that could include 713 apartments, including a 16-story tower.
The project remains a proposal, so the design, unit count, timing, or even whether it gets built could still change.
That distinction matters.
Why it matters
If it moves forward close to the current concept, it would add a significant amount of housing near downtown and the Boise River.
It would also represent a noticeably different scale of residential development for that part of Boise.
8. 800 W. State Street Mixed-Use Project
A long-discussed downtown project near the Idaho State Capitol moved another step forward in 2026.
Plans call for replacing the former bank building at 800 W. State Street with a seven-story mixed-use building containing restaurant and retail space, offices, underground parking, and approximately 10 to 12 condominiums.
Boise’s Design Review Commission approved the project earlier in 2026, allowing the developer to move toward demolition and building permits.
Why it matters
This is not Boise’s biggest project.
But the location is unusually prominent.
Anything built one block from the Capitol affects the visual and commercial character of downtown.
Explore the area with The Ultimate Guide to Downtown Boise.
9. Lake Hazel Road Extension
Some of Boise’s most consequential development projects are roads rather than buildings.
The proposed Lake Hazel Road extension would eventually connect Southwest Boise toward Southeast Boise and unlock additional land south of the airport for future industrial and commercial development.
Boise received federal funding in 2026 to advance engineering and planning and get the project closer to construction readiness.
Why it matters
This road could shape where Boise grows next.
the airport
industrial development
Micron
Southeast Boise
Southwest Boise
future housing
This is a project to watch over years, not months.
10. Boise’s Next Growth Area South and East of the Airport
The City of Boise is also studying major undeveloped areas near Micron, the airport, and the so-called Third Bench.
City leaders began strategic planning in 2026 for how these areas could eventually support industrial, commercial, and residential development.
This is much earlier-stage than something like St. Luke’s or the airport.
There are still major infrastructure questions, particularly roads and utilities.
Why it matters
This could eventually become one of Boise’s largest geographic expansions.
It also shows that Boise’s growth story is beginning to move in directions other than simply west toward Meridian.
Housing Development Is Increasing Citywide
These major projects sit inside a broader change in Boise development.
City data reviewed in early 2026 showed nearly 2,000 new housing units were approved during the previous year, with more than half concentrated near downtown, major transit corridors, or commercial areas targeted for additional density under Boise’s newer zoning code.
That means many future Boise projects may look less like giant subdivisions and more like apartments along commercial corridors, redevelopment of shopping centers, mixed-use infill, townhomes, and smaller multifamily projects.
The Hillcrest project is a good example.
Not Every Proposed Project Will Get Built
This is important whenever we cover development news.
There is a major difference between under construction, approved, proposed, and in early planning.
A rendering does not mean construction is imminent.
Developments can change because of financing, zoning, neighborhood feedback, market conditions, engineering issues, or developer decisions.
That is why YoBoise will continue updating these projects as they move through the process.
What to Watch Through the Rest of 2026
The projects to watch most closely are Micron’s second fab, Boise Airport construction, St. Luke’s tower work, completion of downtown 8th Street improvements, the new YMCA, and whether some of the larger apartment proposals move from planning into actual construction.
Boise’s development story is no longer simply that the city is growing.
The more interesting question is where that growth is happening and what kind of city it creates.
The Bottom Line
Boise has a lot under construction.
Some of it will be highly visible.
Some of it will quietly change how people live, work, travel, and move around the city.
Micron could reshape Southeast Boise and the regional economy.
Airport expansion will change how Boise connects to the rest of the country.
St. Luke’s will transform part of downtown.
New apartment projects will keep testing Boise’s approach to density and infill.
And road projects such as Lake Hazel could determine where an entirely new generation of Boise development eventually goes.
We’ll keep following them.
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