Backyard accessory dwelling unit — Naperville, IL
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
About this service
This is a detached unit built on your property, separate from your main home. It is a practical solution if you have extra yard space and want to add living quarters for family, guests, or tenants. These structures offer privacy while keeping you close to your primary residence.
Frequently asked in Naperville
What are the local rules for building an accessory dwelling unit in Naperville?
Are there any grants or incentives for ADUs in Naperville?
What makes a 'best' accessory dwelling unit for a Naperville home?
The 'best' accessory dwelling unit really depends on your specific needs and your Naperville property. A detached unit in a spacious backyard offers privacy, while an attached unit might be more cost-effective. Consider how you plan to use it – for rental income, family, or a home office. The pros can help you design a functional and aesthetically pleasing ADU that fits your lifestyle.
How does a modular ADU compare to a traditional build in Naperville?
What if I need an emergency accessory dwelling unit in Naperville?
What is an accessory dwelling unit and why build one in Naperville?
An accessory dwelling unit, or ADU, is a secondary housing unit on a single-family lot in Naperville. It can be attached or detached, like a garage conversion or a backyard cottage. People build them for rental income, to house family members, or for extra living space. They're a smart way to add value and utility to your Naperville property.
How do I get an estimate for an ADU in Naperville?
Also serving nearby: Aurora · Joliet · Elgin · Chicago · Waukegan
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Naperville — population 150,245; about 3,836 residents per square mile across 39.2 sq mi. ZIP codes covered include 60540, 60563, 60564, 60565, 60566, 60567.
Neighborhoods served in Naperville: Downtown Naperville, Riverwalk, Mayfield, Naperville Heights, Meadow Lakes — and every surrounding area.
Areas we serve
Browse by state, then city.