How the ADU Design & Build Process Works
A Homeowner’s Guide from Planning to Move-In
Building an Accessory Dwelling Unit (ADU) in Denver can feel complex—permits, design decisions, contractor coordination, and local zoning can all be overwhelming. At Denver Dream Builders, we specialize in making that process smooth, clear, and aligned with your goals. Below, we answer the 10 most common questions homeowners have about how ADUs are designed and built in the Denver metro area.
1. What are the first steps in building an ADU?
Before swinging a single hammer, you’ll want to start with feasibility. That means:
- Checking your zoning code and lot size
- Evaluating utility access and setback requirements
- Understanding parking and height restrictions
- Aligning on your budget range and desired use (rental vs. in-law suite)
At DDB, we walk clients through this in a free discovery call before moving into formal design.
2. Do I need an architect to build an ADU?
Yes, in most Denver jurisdictions you will need architectural plans stamped by a licensed professional. We collaborate with local architects who understand Denver’s codes and can fast-track permitting with clean, compliant plans. Design-build firms like ours handle this coordination for you.
3. How long does the full ADU process take?
Typical timeline:
- Feasibility & Pre-Design: 2–3 weeks
- Design & Permitting: 6–10 weeks
- Construction: 3–6 months
Total time from idea to move-in: 4 to 7+ months, depending on project size, city review times, and weather conditions.
4. What’s the difference between a detached ADU and a garage conversion?
A detached ADU is a standalone unit (often built in the backyard). A garage conversion ADU repurposes your existing garage—this is usually faster and cheaper because the structure already exists. We help you compare options based on cost, space, and long-term goals.
5. Will I need to run new utility lines to the ADU?
Often, yes. ADUs typically need:
- Dedicated electrical panels
- Water and sewer connections
- Gas lines if using gas appliances
In some cases, utilities can be split or sub-metered from the main home. We’ll evaluate this early to avoid costly surprises.
6. Do I have to match the design of my main house?
Design cohesion is encouraged—but not required. Denver’s permitting offices will review your ADU’s materials, roof pitch, and exterior finishes for compatibility. That said, modern ADUs and tasteful contrasts are often approved, especially if your lot isn’t in a historic overlay district.
7. Can I customize the interior layout and finishes?
Absolutely. While most ADUs follow a compact footprint (400–800 sq ft), layout flexibility is key. We’ll help you maximize space for:
- Kitchens and laundry
- Accessible bathrooms
- Storage solutions
- Lofted ceilings and natural light
Interior selections—flooring, cabinetry, tile, etc.—are fully customizable within your budget.
8. What inspections are required during construction?
Your ADU will be inspected at multiple stages:
- Foundation & footings
- Framing & sheathing
- Electrical, plumbing, and mechanical rough-ins
- Insulation and drywall
- Final walk-through for code compliance
We schedule all city inspections and ensure compliance throughout the build.
9. Can I live in my home while the ADU is being built?
Yes—in almost all cases. Our crews keep work areas clean and contained. For detached units, construction usually occurs entirely in the backyard. For garage conversions, we plan staging areas carefully to minimize disruption.
10. Who manages the permit process?
We do. Denver’s ADU permit process can be tricky, especially with neighborhood overlays or historic zones. Our team handles:
- Zoning research
- Architectural submittals
- City communication
- Corrections or revisions
We keep clients updated weekly while managing the paperwork end-to-end.
✅ Thinking About Building an ADU?
At Denver Dream Builders, we make the complex process of building an ADU feel straightforward. From zoning to final inspection, our local team walks with you every step of the way.
📞 Schedule your ADU discovery call today