Ada County building departments collectively issued 1,840 building permits in the first quarter of 2026, a 22% increase over the same period last year and the strongest start to a building year since the pre-pandemic boom of 2021, according to data compiled by the Ada County Development Services office. The surge reflects continued strong demand for housing and commercial space across the Treasure Valley, driven by sustained population growth and a labor market that continues to attract new residents from higher-cost western states.
Single-family home permits led the increase with 1,120 issued between January and March — up 25% from 896 in the first quarter of 2025. Commercial building permits totaled 380, a 15% increase, while multifamily permits (apartments and condominiums) came in at 340, up 18%. The data encompasses permits issued by all Ada County municipalities: Boise, Meridian, Eagle, Kuna, Star, and Garden City, as well as unincorporated Ada County.
Where the Building Activity Is Concentrated
Meridian accounted for the largest share of residential permits at 42% of the county total, reflecting the city’s status as Idaho’s fastest-growing municipality. The Ten Mile Road corridor and areas south of the I-84 interchange saw particularly strong activity, with several large subdivisions breaking ground simultaneously. Boise followed at 28% of permits, with activity concentrated in Southeast Boise and the Barber Valley area. Eagle captured 14% of residential permits, Star 10%, and Kuna 6%.
Commercial permit activity was more evenly distributed, with significant projects in downtown Boise (office and mixed-use), the Eagle Road corridor in Meridian (retail and medical), and the Ten Mile area (mixed-use and hospitality). Ada County Development Services director Sarah Mitchell noted that commercial permits have shifted toward mixed-use projects that combine ground-floor retail or restaurant space with upper-floor residential units — a trend she attributes to evolving market demand and updated zoning codes in Boise and Meridian.
What’s Driving the Building Boom in Ada County
The permit surge reflects multiple converging factors. Ada County continues to add approximately 12,000-15,000 new residents annually, creating persistent demand for new housing. The region’s diversifying economy — anchored by technology, healthcare, and professional services — is generating high-paying jobs that attract skilled workers who need places to live. And despite elevated mortgage rates, Ada County’s housing market remains more affordable than comparable markets in the Pacific Northwest and Mountain West, maintaining its appeal for relocating families and remote workers.
Builder confidence has also strengthened, according to the Idaho Building Contractors Association. Material costs have stabilized after years of volatility, labor availability has improved modestly with the entry of new workers into the construction trades, and banks are lending on new projects more readily than they were 12 months ago.
“The fundamentals in Ada County haven’t changed — people want to live here, employers want to hire here, and the quality of life continues to attract investment,” said IBCA executive director Ken Burgess. “What’s different this year is that the cost and supply side has improved enough for builders to move forward on projects that were on hold.”
Infrastructure and Community Impact
The building surge has implications for Ada County’s infrastructure and public services. ACHD is monitoring the pace of development to align road improvement schedules with new subdivision completions. School districts are tracking permit data to project enrollment and staffing needs. Emergency services agencies use building permit trends to plan station locations and staffing levels.
Impact fees collected on new construction provide significant revenue for these infrastructure needs. In the first quarter alone, Ada County municipalities collected an estimated $18 million in impact fees from new development — funds that are legally restricted to infrastructure improvements necessitated by growth.
What Comes Next
Building industry analysts expect permit activity to remain elevated throughout 2026, though the pace may moderate from first-quarter levels as seasonal patterns take effect. The Ada County Association of Realtors provides monthly market reports at boiserealtor.com. Residents interested in development activity in their neighborhoods can access permit records through each municipality’s planning department website or by contacting Ada County Development Services at 208-287-7900.