Custom ADU Construction for More Space

At Nenneman-Haus Construction, we build custom accessory dwelling units (ADUs) that give you more usable space right on your property. Whether you want a backyard home for family, a private guest suite, a place for aging parents, or a flexible rental unit, we help you turn that idea into a well-built living space that fits your lot, needs, and budget.

An ADU is a fully functional secondary home built on the same property as your main house. It may be a detached backyard cottage, an attached in-law suite, or a converted space designed for independent living. These projects need careful planning because they combine design, structural work, utilities, code requirements, and finish selections into one complete build. We handle the process with a practical, hands-on approach so you know what to expect from start to finish.

What an ADU can be used for

ADUs are one of the smartest ways to add living space without moving. We often build these spaces for:

• Multigenerational living
• Guest accommodations
• Private space for adult children
• Housing for aging parents
• Long-term rental income
• A home office or studio with living amenities

Every property is different, so we take the time to understand how you plan to use the space before we recommend a layout, size, and construction plan.

Our ADU construction process

We believe a successful ADU project starts with clear communication and solid planning. When you contact us, we begin by learning about your goals, the available space on your property, and the features you want included. From there, we work through the scope of the project in a clear step-by-step process.

• Initial consultation: We discuss your vision, intended use, rough size, and budget range.
• Site review: We evaluate the build area, access, grading, utility connections, and how the new structure will fit with the existing home and lot.
• Design planning: We help shape the floor plan, room layout, exterior style, and functional details.
• Project development: We outline materials, construction scope, major specifications, and timeline expectations.
• Construction: We complete the build with attention to structure, quality finishes, safety, and code compliance.
• Final walkthrough: We review the finished space with you and make sure everything is completed as promised.

What is included in ADU construction

ADU construction is more than building walls and a roof. A complete project may include many parts working together to create a comfortable, self-contained living area. Depending on the design, scope, and site conditions, your ADU project may include:

• Site preparation and foundation work
• Framing and structural construction
• Roofing and exterior siding
• Windows and exterior doors
• Insulation and drywall
• Electrical wiring and lighting
• Plumbing and water line connections
• Heating and cooling systems
• Kitchen and bathroom installation
• Flooring, trim, and interior finishes
• Cabinetry, countertops, and storage solutions
• Porches, steps, and entry features as needed

We also pay close attention to how the ADU blends with your existing home, so the new structure feels like a natural part of your property instead of an afterthought.

Custom features and design options

No two households use an ADU the same way, which is why custom design matters. We can build around the features that will make the space more comfortable, practical, and valuable over time. Popular options include open-concept living areas, compact but efficient kitchens, full bathrooms, laundry spaces, built-in storage, accessible layouts, and private entrances.

If you are planning for long-term use, we can also discuss design choices that support easier mobility and daily comfort, such as wider doorways, low-step entries, and user-friendly bathroom layouts. Our goal is to create an ADU that not only looks good today but also works well for years to come.

Why homeowners invest in ADUs

Adding an ADU can solve several problems at once. It gives you more space while helping you stay in the neighborhood you already enjoy. It can improve privacy for family members, create flexibility for changing life stages, and increase the usefulness of your property. In many cases, a well-built ADU can also add long-term value and appeal to your home.

For homeowners who need room for family but do not want to sacrifice comfort, an ADU offers independence without being far apart. For those looking at future income potential, it can create another housing option on the property. For others, it is simply the best way to get the extra square footage they need without taking on the stress of moving.

Built with experience and straightforward service

Nenneman-Haus Construction is a veteran-owned company, and we bring that same discipline, reliability, and attention to detail to every project we take on. We know major home additions and detached living spaces are a big investment, so we focus on honest communication, clean workmanship, and practical solutions that make sense for your property.

We keep the payment process simple: 50% up front and 50% at completion. That gives you a clear understanding of how the project is funded from the beginning. If you are comparing builders for a backyard cottage, in-law suite, secondary dwelling unit, or custom guest house, we would be glad to talk through your ideas and help you understand what is possible.

Start planning your ADU

If you are ready to add a custom-built backyard home or suite, contact Nenneman-Haus Construction at (712) 621-7304 or reach out through our website form. We proudly serve homeowners in the 51566 and 51573 areas. Let’s talk about your property, your goals, and the kind of ADU that will give you the extra space you need.