Welcome to Colorado’s Premier ADU Builders
Reliable ADU Services in Longmont, CO
Transform your property with a top-rated ADU builder delivering design-build expertise, streamlined permitting, quality craftsmanship, and on-time backyard homes that maximize space, value, and income.
Looking for Reliable ADU Builders in Longmont, CO?
Build a high-quality Accessory Dwelling Unit in Longmont, CO with our compliant, design-build team. We navigate local zoning, permits, connections, and setbacks, delivering smart footprints for rental income or multigenerational living. From feasibility and budgeting to engineered plans, energy-smart construction, and inspections, we streamline every step. Expect timelines, fair pricing, and craftsmanship tailored to Boulder County’s climate. Add value, flexibility, and privacy to your property. Schedule your ADU consultation today.
As part of our ADU construction services, our team can handle:
Detached ADU
Unlock your property’s potential with a detached ADU—an independent, code-compliant living space that elevates value, generates rental income, and supports multigenerational living. Our expert team delivers turnkey design, permitting, and construction, optimizing your lot for privacy, comfort, and efficiency. From modern studios to two-bedroom cottages, we integrate energy-smart systems, durable materials, and elegant finishes. Build faster, maximize ROI, and create flexible space for guests, caregivers, or home offices—in your backyard.
Attached ADU
An Attached ADU transforms underused space into high-value living, seamlessly integrating with your home’s design while preserving privacy and comfort. Maximize property value, generate rental income, or create flexible quarters for multigenerational living, a guest suite, or an office. Enjoy faster permitting, cost-efficient construction, and energy-smart materials within your existing footprint. We deliver turnkey design-build services, from feasibility and financing to construction and finishes, ensuring a compliant and future-ready addition.
Garage Conversion ADU
Transform unused space into value with a Garage Conversion ADU. Our experts design and build code-compliant, energy-efficient living units that enhance property value, generate rental income, and create multigenerational flexibility. From feasibility studies and permits to construction and finishes, we deliver turnkey solutions on schedule and budget. Enjoy smart layouts, natural light, quality materials, and seamless integration with your home. Boost equity, comfort, and cash flow—without expanding your footprint today.
Prefab and Modular ADU
Prefab and modular ADUs deliver high-quality, code-compliant living space faster, with predictable costs. Factory-built components minimize on-site disruption, accelerate timelines, and ensure craftsmanship. Choose flexible floor plans for rental income, multigenerational living, or a dedicated home office. Our turnkey process covers design, permitting, utilities, and installation, with energy-efficient options that lower operating costs. Increase property value and lifestyle flexibility with a streamlined, reliable path to extra space—installed in just weeks.
Basement ADU
Transform your underused basement into a high value Accessory Dwelling Unit that adds income potential, multigenerational flexibility, and resale appeal. Our team designs code compliant layouts with natural light strategies, moisture control, sound insulation, and separate entries. From permits and structural upgrades to finishes and energy efficient systems, we manage every step for a smooth build. Maximize space, boost property value, and create a comfortable, compliant home within your basement.
What to consider when building an ADU in Colorado
Considering an ADU in Colorado? Start by confirming applicable zoning, building codes, and permitting timelines. Evaluate lot suitability, setbacks, access, and utility capacity for water, sewer, and power. Align budget, financing, and ROI goals with realistic construction and maintenance costs. Prioritize privacy, daylight, and durable materials in the design. Choose a licensed, insured builder with ADU experience, and plan for insurance, long-term management, and sustainable features to enhance value.
How much does it cost to build an ADU in Colorado?
Building an ADU in Colorado typically costs $150k–$220k for 300–450 sq ft, $230k–$350k for 600–800 sq ft, and $320k–$500k for 900–1,000 sq ft. Prices vary by sitework, utilities, finishes, structural complexity, local fees, and labor/market conditions. Expect 2–4 months for design/permitting and 4–8 months for construction: 6–8 months (small), 7–10 months (mid), 8–12 months (large). Get a tailored quote to maximize value and ROI.
FAQs
Common Questions About ADUs
What are ADUS?
Accessory Dwelling Units (ADUs) are small homes on the same lot as a primary residence, such as backyard cottages, garage or basement conversions, providing flexible housing, rental income, and multigenerational living, subject to local codes.
Are ADUs legal in my area?
ADU legality depends on your city. Check your zoning district in the municipal code or GIS map, review state ADU statutes, and confirm setbacks, parking, utilities, and permits with the planning department before proceeding.
How much does it cost to build an ADU?
Building an ADU typically costs $100,000–$400,000, or about $250–$500 per square foot, depending on location, size, type (conversion, attached, detached), finishes, site conditions, utility upgrades, permits, design, and contractor availability.
Can I rent out my ADU?
Yes, you can often rent out an ADU, but rules vary by city. Confirm zoning and permits, owner-occupancy requirements, minimum rental terms, parking, utility metering, HOA restrictions, and local short-term rental prohibitions and taxes.
How long does it take to build an ADU?
Building an ADU typically takes 6–12 months, including 2–4 months for design and permitting and 3–6 months for construction. Timelines vary by jurisdiction, site conditions, utilities, and whether the unit is prefab or stick-built.
Book a Free Consultation
Colorado’s Premier ADU Builders | ADU Construction in Longmont, CO
Partner with a trusted ADU builder in Longmont, CO, delivering code-compliant designs, transparent pricing, and seamless project management from permitting to turnkey completion.
Phone
(303) 857-5592