Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Columbus, OH? Call AccessoryDwellingUnit Solutions for a contact a provider — no obligation. Licensed adu builders serve Columbus and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

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When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.

Frequently asked in Columbus

What are the disadvantages of ADUs in Columbus?

Potential downsides to an ADU in Columbus can include increased property taxes and the complexities of managing a rental if that's your intention. Local zoning regulations in Columbus will dictate size and placement. It's also worth considering the impact on privacy for both you and your ADU tenants. A local professional can detail these aspects.

How much does an ADU cost in Ohio?

What are the rules for ADUs in Ohio?

Ohio's approach to ADUs can vary by municipality, so Columbus has its own specific set of rules. These typically address lot coverage, minimum unit size, and parking requirements. Familiarizing yourself with these local ordinances is crucial for a smooth building process. A local expert will be well-versed in Columbus's ADU regulations.

Is an ADU allowed in Maryland?

What are the rules for ADU in California?

California has specific statewide ADU legislation, but this does not directly apply to regulations in Columbus, Ohio. Ohio municipalities, including Columbus, establish their own ADU rules based on local needs and zoning. It's important to rely on local expertise for compliance with Ohio's specific requirements.

Also serving nearby: Dayton · Cincinnati · Akron · Toledo · Cleveland

All cities in Ohio →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

913,175residents

4,137per sq mile

8ZIP codes served

Serving all of Columbus — population 913,175; about 4,137 residents per square mile across 220.7 sq mi. ZIP codes covered include 43085, 43201, 43202, 43203, 43204, 43205, 43206, 43207.

Neighborhoods served in Columbus: Short North, German Village, Downtown, Clintonville, Grandview Heights — and every surrounding area.