SSyracuse ADU
The Syracuse ADU Guide

Building an accessory dwelling unit in the City of Syracuse.

A plain-English breakdown of what's allowed, what it costs, and how long it takes — based on the current Syracuse zoning code and Bureau of Inspection process.

01 — Rules

Syracuse ADU zoning at a glance

Syracuse permits accessory dwelling units by right in residential zones. Both detached and attached ADUs are allowed on conforming lots without a special use permit.

Detached max size
800 sq ft
Attached max size
35% of primary dwelling floor area
Side setback
3 ft
Rear setback
5 ft
Owner-occupancy
Not required
Snow load
Designed to Syracuse code (50+ psf)
02 — Types

Four ways to add an ADU in Syracuse

  1. 01

    Detached cottage

    A new freestanding structure in the rear or side yard — up to 800 sq ft, usually one bedroom plus a kitchen and bath.

  2. 02

    Garage conversion

    Convert an existing detached garage or carriage house. Often the most cost-effective path in older Syracuse neighborhoods.

  3. 03

    Attached addition

    An addition built off the primary home with its own entrance, kitchen and bath — up to 35% of the main house floor area.

  4. 04

    Internal conversion

    Carve an ADU out of an existing basement, attic or extra floor. Egress and ceiling height drive feasibility.

03 — Costs

What you'll spend in CNY

Permit fees through the Syracuse Department of Neighborhood and Business Development typically run $1,000–$4,000 total, depending on scope and valuation.

All-in construction costs in the Syracuse market generally land in these ranges:

Garage conversion
$95k – $180k
Internal conversion
$110k – $200k
Detached new build (700–800 sf)
$240k – $360k
Attached addition
$220k – $340k

Ranges reflect 2026 CNY labor and material pricing. We provide fixed-price proposals after site visit and schematic design.

04 — Timeline

From first call to first tenant

  1. Weeks 1–2
    Feasibility, zoning check, site measure
  2. Weeks 3–8
    Schematic and permit-ready design
  3. Weeks 9–16
    Syracuse Bureau of Inspection review (4–8 wks)
  4. Months 4–10
    Construction, MEP rough-in, inspections, finishes
  5. Month 10–11
    Certificate of occupancy, walkthrough, lease-up
05 — Next steps

How to get started

  1. Confirm your lot is zoned for residential use (most of Syracuse is).
  2. Decide which ADU type fits your lot, goals and budget.
  3. Submit a building permit through the Syracuse Bureau of Inspection.
  4. Engage a licensed CNY contractor familiar with NY ADU rules.
Book a free consultation
06 — City contact

Syracuse Bureau of Inspection

Department
Neighborhood & Business Development
Phone
(315) 448-8640
Inspection
syrgov.net/inspection
Online permits
syrgov.net/permits