O’Brien Construction LLC

O’Brien Construction LLC is a general contracting and residential construction company based in Denver, Colorado. The company provides residential and commercial construction, remodeling, home additions, framing, carpentry, and ADU construction services. Its ADU division combines design, engineering, permitting, and construction to help homeowners develop additional living space for family, guests, rental use, home offices, and other purposes.

An accessory dwelling unit (ADU) — also known as a granny flat, in-law suite, backyard cottage, casita, or secondary dwelling unit — is an independent living space located on the same property as a primary residence.

ADU Services

1. Custom ADU Construction: O’Brien Construction builds custom ADUs based on the homeowner’s property, goals, budget, and intended use. The company states that its ADU work can accommodate uses such as long-term rentals, short-term vacation rentals, home offices, art studios, and in-law or granny suites.
2. ADU Design & Engineering: The company has developed design, engineering, and construction processes specifically for ADU projects and can assist homeowners in developing a design suited to their property.
3. ADU Permitting: O’Brien Construction emphasizes its knowledge of local ADU regulations and states that its process helps designs meet applicable building and safety requirements, supporting the permitting process.
4. In-Law & Granny Suites: The company’s completed ADU work includes in-law and granny suites designed to provide independent living space for family members.
5. Rental & Flexible-Living ADUs: ADUs can also be developed for long-term rental, vacation rental, home-office, studio, and other residential purposes.

What O’Brien Construction Offers Beyond Construction

O’Brien Construction operates as a full-service general contractor, handling multiple aspects of residential and commercial construction. Its broader project process can include cost estimates, blueprint development, design services, site management, subcontractor coordination, foundation work, framing, drywall, carpentry, plumbing, electrical, HVAC, flooring, and other construction trades.

For ADU projects, the company emphasizes a streamlined permitting process, quality materials, adherence to budgets and deadlines, and licensed, bonded, and insured construction professionals.

Beyond ADUs, O’Brien Construction provides:

• Residential construction
• Commercial construction
• Home additions
• Remodeling
• Framing
• Carpentry
• Deck and patio construction
• Siding installation
• Plumbing
• Electrical
• HVAC
• Flooring
• Drywall
• Home repairs