Building an ADU is more than adding square footage, it’s about creating a functional space that works for your goals. Whether you’re building an accessory dwelling unit for rental income, a backyard ADU for guests, or a custom ADU to use as a private office, your property layout, local zoning, and intended use will shape the ideal design. We build all types of ADUs: attached ADUs, detached units, garage conversion ADUs, junior ADUs, and internal ADUs. Each one offers unique benefits—some maximize privacy, others optimize existing space like garages or basements. Not sure which ADU is right for your home? Explore the types of ADUs we specialize in, and see how we help homeowners create smart, valuable additions that last.
From small ADUs to spacious custom builds, our work showcases what’s possible when you have the right design, team, and vision. These aren’t cookie-cutter builds. Each accessory dwelling unit is designed for the unique needs of the homeowner and the layout of the property. Designed for rental income, family living, or personal space built with style and smart functionality.
Attached ADUA home extension that’s connected to your main house! Ideal for keeping loved ones close or creating private guest space. Detached ADUA standalone unit on your property, perfect for private rental, long-term guests, or multigenerational living. Junior ADU (JADU)Smaller, self-contained units built within your home—often ideal for one-bedroom layouts or rentals under 500 sq ft. Internal ADU We can convert part of your existing home like a basement or unused space into a functional and separate living unit. Garage ConversionWe transform your existing garage into a fully livable ADU—cost-effective and space-efficient.
COMMON ADU FEATURES
Living room
Bedroom
Master bedroom
Craft room
Sunroom
Walk-in closet
Kitchen
Kitchenette
Bathroom
Staircase
Deck
Porch
Sliding doors
Raised foundation
Slab foundation
Building an ADU is a significant investment. Qualified homeowners may have financing options available that can help make the project more achievable without relying entirely on existing home equity or cash. Our financing partner offers a Renovation HELOC that may use your home’s projected after-renovation value, helping you keep your current mortgage rate while financing a qualifying ADU project.
Finance your ADU without refinancing your existing first mortgage.
Financing may be based on your home’s projected value after the ADU is completed.
A simplified financing process designed to help qualified homeowners move their ADU project forward.
Using after-renovated value on a HELOC
Office: (720) 783-5047Cell: (303) 870-1074 www.usmortgage.com/Darcie.Coxdarcie.cox@usmortgage.com
Branch Manager | NMLS#: 263092
191 Telluride Street, Suite #08B Brighton, CO 80601
Branch Office: (NMLS ID#2575916) US Mortgage Corporation, 191 Telluride Street, Suite #08B, Brighton, CO 80601. CO (Regulated by the Division of Real Estate). Arizona Department of Financial Institutions, Mortgage Banker License. BK-BR-2001689 Licensed in: CO (Regulated by the Division of Real Estate), US Mortgage Corporation is not an agent of or acting on behalf of or at the direction of HUD/FHA/VA/USDA or the Federal government. Approved Fannie Mae & Freddie Mac Direct Seller & Service. Rates, fees and program guidelines are subject to change without notice. Some loans arranged through third party providers. Not all products and/or programs are available in all states. Certain restrictions may apply. This is not intended as an offer to extend credit nor a commitment to lend. Equal Housing Lender. US Mortgage Corporation (NMLS ID#3901) is licensed as a mortgage lender nationwide except for HI. For licensing information, go to: https://usmortgage.com/disclosures/ and https://www.nmlsconsumeraccess.org/EntityDetails.aspx/COMPANY/3901
FAQ
An ADU, or accessory dwelling unit, is a self-contained living space on the same property as a single-family home. It can be attached, detached, a garage conversion, or even an internal unit like a basement suite.
The cost of building an ADU in your backyard depends on size, design, permits, and features like bathrooms or kitchens. Backyard ADUs and custom units typically start in the low six figures.
Yes — garage conversions are a popular and cost-effective way to add an ADU. Whether it's a 2-car garage ADU conversion or a detached garage, we handle everything from design to permitting.
We build all ADU types: attached, detached, junior ADUs, internal units, and garage conversions. Whether you're looking for a one-bedroom ADU or something compact like a small ADU, we’ve got you covered.
Yes — a well-designed ADU adds significant value, whether you're looking to generate rental income, house family, or boost resale value. They’re a smart long-term investment.
Most ADUs take 4–9 months from start to finish depending on the type (e.g., attached ADU vs. garage conversion) and the permit process in your city.
Before you start, it’s crucial to understand the local rules for accessory dwelling units. Colorado’s Department of Local Affairs (DOLA) provides a comprehensive guide outlining requirements for zoning, permitting, size limits, and utility connections for ADUs. Check out the official ADU regulations from the state here: Colorado ADU Regulations Guide – DOLA
Contact us for a free consultation. We’ll walk you through everything step-by-step.