What is the 2026 cost range for a attached adu scope adu in Miami?

$188,100-$397,100, with the median landing near $292,600. The range reflects finish tier and layout complexity within the attached adu scope; the Miami labor multiplier of 1.10× vs national median is baked in.

How long does a attached adu scope adu take in Miami?

22-32 weeks of on-site construction for the attached adu 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?

Utility separation surprises — some markets require a new electrical service drop from the street, not just a sub-panel. Utility-company coordination adds 6-10 weeks and $8-14K.

ADU — Attached ADU Cost in Miami, 2026

Low

$188K

$188,100

Median

$293K

$292,600

High

$397K

$397,100

Scope timeline: 22-32 weeksMiami permit window: 6-14 weeksUpdated 2026-04-24

Why attached adu × Miami produces this band

A attached adu scope for a adu in Miami combines two price levers: scope and metro labor rates. Attached ADUs share a wall with the primary house. Needs its own entrance, fire-rated separation, and (in most jurisdictions) independent utility metering — but shares the site's foundation-extension cost. Against the national median remodel labor rate, Miami runs 10% above the national median — so the attached adu band comes in 5% below 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 attached adu scope

·Fire-rated wall assembly (typically 1-hour, sometimes 2-hour)
·Independent utility service drops
·Shared-wall sound isolation (STC 50+)
·Grading and drainage on the new footprint

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 adu with Baily.

Baily asks the eight questions that determine where your project lands inside the $188K-$397K band for Miami and hands the scoped brief to one licensed builder.

Loading chat…

Miami remodel cost hub →Back to all cost guides →Ask Baily about your project →

Questions LA homeowners actually ask

$188,100-$397,100, with the median landing near $292,600. The range reflects finish tier and layout complexity within the attached adu scope; the Miami labor multiplier of 1.10× vs national median is baked in.