Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Montgomery, AL? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Montgomery 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 is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Determining the cost requires looking at site preparation, foundation work, and the level of interior finishing you choose. Costs change based on whether you opt for a pre-designed layout or custom architecture. You should research these costs when you are ready to evaluate the financial return of your property upgrade. Exact pricing confirmed free on the call.

Frequently asked in Montgomery

What are the disadvantages of ADUs in Montgomery?

Potential downsides include navigating Montgomery's specific zoning and permitting requirements. Financing an ADU might also be more complex than a primary home loan. Ongoing maintenance and utility costs are also factors to consider. However, these are manageable with careful planning and the right team.

How much does an ADU cost in Alabama?

What are the rules for ADUs in Alabama?

Is an ADU allowed in my Montgomery neighborhood?

What is the grant for ADUs in Alabama?

Currently, there are no widespread state grants specifically for ADUs in Alabama. However, local programs or financing incentives might be available. When you call for your estimate, you can ask about any known funding opportunities for your Montgomery project. We focus on providing you with an accurate quote.

What is the cost to build an accessory dwelling unit in Montgomery?

Also serving nearby: Columbus · Hoover · Birmingham · Tuscaloosa · South Fulton

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

Service area details

195,287residents

1,221per sq mile

8ZIP codes served

Serving all of Montgomery — population 195,287; about 1,221 residents per square mile across 159.9 sq mi. ZIP codes covered include 36101, 36102, 36103, 36104, 36105, 36106, 36107, 36108.

Neighborhoods served in Montgomery: Downtown Montgomery, Capitol Heights, Cloverdale, Garden District, Maxwell Air Force Base Area, East Montgomery — and every surrounding area.