Mortenson's Phoenix Q1 2026 Cost Index shows construction costs in the metro rose 1.97% over the quarter and 7.05% year-over-year — meaningfully ahead of the national increase of 1.7% quarterly and 6.8% year-over-year over the same period. Costs are moderating slightly from their peak, but Phoenix is still growing faster than the country as a whole.
What's driving the increase
**Metal and energy costs.** These were called out as the primary national driver behind the Q1 increase, and Phoenix's heavy exposure to industrial and data center construction means the metro feels commodity price swings more directly than markets with a more residential-heavy mix.
**Data center development.** Arizona's data center boom has been disproportionately straining supply chains and materials availability — not just for the data centers themselves, but for every other project competing for the same steel, electrical gear, and skilled trades.
**Electrical and power distribution constraints.** This is arguably the tightest bottleneck in the Phoenix market right now. Power infrastructure buildout hasn't kept pace with demand from data centers and industrial users, which is pushing up costs and timelines for electrical scope across nearly every project type.
**A tightening labor market, even with job growth.** Statewide construction employment has continued climbing — the sector added roughly 2,900 jobs in a recent month alone, with Phoenix-Mesa-Scottsdale accounting for the bulk of the statewide gain. But steady job growth hasn't been enough to fully absorb the pipeline; Specialty Trades, Buildings, and Heavy Construction have all posted gains, yet contractors are still reporting cost pressure from labor availability.
A wrinkle worth watching
Arizona's state budget deal recently **halted data center tax incentives for three years** — a policy shift that could cool some of the speculative demand currently straining materials and power infrastructure. It's too early to say how much relief that provides estimators, but it's a genuine variable for anyone pricing a multi-year project timeline in the Valley right now, and worth flagging in any long-range budget you're building.
At the same time, Arizona's broader industrial boom has **largely skipped the state's secondary markets** — meaning cost pressure is concentrated in Phoenix and its immediate suburbs rather than spread evenly statewide. Tucson and other secondary metros are seeing a different, generally softer cost trajectory.
What this means for your estimates
If you're pricing Phoenix-metro work in 2026:
- **Don't anchor to national cost indices.** Phoenix is running meaningfully hotter than the U.S. average, and a national multiplier will systematically underbid the market. - **Flag electrical scope as a risk line, not a standard assumption.** Power distribution constraints are a real driver of both cost and schedule risk right now, particularly for anything with significant electrical load. - **Watch the data center incentive rollback.** A slowdown in speculative data center activity could ease materials and labor pressure over the next 12–24 months — build some flexibility into longer-horizon estimates rather than assuming today's tightness holds indefinitely. - **Don't apply Phoenix multipliers to Tucson or secondary markets.** The current cost pressure is concentrated, not statewide.
Sources & research notes
Primary sources checked on September 15, 2026. Confirm current project requirements with the responsible authority. Estimating implications are editorial analysis; examples are hypothetical.
- Phoenix Construction Costs Outpaced National Average in Q1 — AZBEX Checked 2026-09-15
- Arizona Budget Deal Halts Data Center Incentives for 3 Years — AZBEX Checked 2026-09-15
- Industrial Boom Largely Skipped Arizona's Secondary Markets — AZBEX Checked 2026-09-15
Updated September 15, 2026. Confirm time-sensitive requirements and project-specific decisions with the responsible authority or professional.