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

$231,000-$528,000, with the median landing near $379,500. The range reflects finish tier and layout complexity within the second-story addition scope; the Miami labor multiplier of 1.10× vs national median is baked in.

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

28-42 weeks of on-site construction for the second-story addition scope, plus 6-14 weeks of permit review in Miami 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 Miami, 2026

Low

$231K

$231,000

Median

$380K

$379,500

High

$528K

$528,000

Scope timeline: 28-42 weeksMiami permit window: 6-14 weeksUpdated 2026-04-24

Why second-story addition × Miami produces this band

A second-story addition scope for a home addition in Miami 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, Miami runs 10% above the national median — so the second-story addition band comes in 50% above the mid-range, then scales 10% above the national median on top of that. Permit timelines for residential work in Miami typically run 6-14 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 Miami 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 Miami different

Labor — HVHZ-certified impact-window installers and roofers are in high demand — commonly booked 10-16 weeks out.
Labor — Post-hurricane insurance-repair cycles pull labor into cycles that compress remodel availability.
Labor — Bilingual (English/Spanish) crew standard; reduces coordination overhead on most residential jobs.
Material — Impact-rated glazing + hurricane shutters carry 35-60% premium over non-impact equivalents.
Material — Coastal-grade (316 stainless steel) hardware adds 10-15% vs standard 304.

Miami rules that affect this scope

Miami-Dade and Broward County HVHZ codes require Product Approval (NOA) for every impact window, door, and roof system — non-NOA products fail inspection.
FEMA flood-zone requirements affect ground-floor scope in Zone AE and VE parcels — foundation and utility placement limits apply.
Florida Building Code 2023 (FBC) wind-mitigation checklist directly affects homeowner insurance premiums post-remodel.
Miami-Dade RER permits via iBuild — homeowner-direct for small scopes; GC-required for most kitchen/bath/addition work.

Scope your home addition with Baily.

Baily asks the eight questions that determine where your project lands inside the $231K-$528K band for Miami and hands the scoped brief to one licensed builder.

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Questions LA homeowners actually ask

$231,000-$528,000, with the median landing near $379,500. The range reflects finish tier and layout complexity within the second-story addition scope; the Miami labor multiplier of 1.10× vs national median is baked in.