What is the 2026 cost range for a second-story addition scope home addition in Phoenix?

$178,500-$408,000, with the median landing near $293,250. The range reflects finish tier and layout complexity within the second-story addition scope; the Phoenix labor multiplier of 0.85× vs national median is baked in.

How long does a second-story addition scope home addition take in Phoenix?

28-42 weeks of on-site construction for the second-story addition scope, plus 2-6 weeks of permit review in Phoenix if the scope requires a permit. Cosmetic-only refreshes often skip permits; anything touching plumbing, electrical, or structural does not.

What is the single biggest budget-overrun risk for this scope?

Foundation inadequacy — if the existing foundation can't carry the new load, underpinning or new footings add $25-50K and 4-8 weeks.

Home addition — Second-story addition Cost in Phoenix, 2026

Low

$179K

$178,500

Median

$293K

$293,250

High

$408K

$408,000

Scope timeline: 28-42 weeksPhoenix permit window: 2-6 weeksUpdated 2026-04-24

Why second-story addition × Phoenix produces this band

A second-story addition scope for a home addition in Phoenix combines two price levers: scope and metro labor rates. A second-story addition requires the existing foundation to be verified (sometimes reinforced), structural beam and column work to carry the new load, a new roof replacing the old, and a new staircase. Most complex addition type. Against the national median remodel labor rate, Phoenix runs 15% below the national median — so the second-story addition band comes in 50% above the mid-range, then scales 15% below the national median on top of that. Permit timelines for residential work in Phoenix typically run 2-6 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 Phoenix bands for this exact combination, plus the three cost drivers Baily asks about first when scoping the project live.

What drives cost for a second-story addition scope

·Structural engineer for load path + foundation capacity
·Full existing-roof removal and new roof install
·New staircase location (often forces a first-floor layout change)
·Weather protection of the existing house during construction

What makes Phoenix different

Labor — Non-union market with high trade availability outside of the May-September summer peak.
Labor — Summer heat (115°F+) shifts exterior trades to before-dawn shifts, adding 10-15% scheduling complexity.
Labor — HOA architectural review in 60%+ of the metro runs in parallel with the City permit and doesn't add cost but adds weeks.
Material — Desert-specific materials (reflective roofing, low-UV exterior finishes) carry a small premium.
Material — Regional lumber supply from California and Pacific Northwest — pricing tracks LA trends loosely.

Phoenix rules that affect this scope

City of Phoenix Planning and Development Department runs plan check through Phoenix PDD Online — residential turnaround 2-6 weeks.
Arizona ROC licensing is tiered (Residential Class A/B/C, KB-1 General Building, KB-2 Residential Remodeling) with bond scaling.
Maricopa County Environmental Services governs septic on homes outside sewer service (common in Ahwatukee, Desert Ridge).
Arizona HB 2720 (2024) preempts many local restrictions on ADUs + casitas — opening more inventory for conversion.

Scope your home addition with Baily.

Baily asks the eight questions that determine where your project lands inside the $179K-$408K band for Phoenix and hands the scoped brief to one licensed builder.

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Questions LA homeowners actually ask

$178,500-$408,000, with the median landing near $293,250. The range reflects finish tier and layout complexity within the second-story addition scope; the Phoenix labor multiplier of 0.85× vs national median is baked in.