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O’Neill Development


11 Russel Ave.
Gaithersburg, MD 20877


Phone: 301-877-9310

Website: https://oneilldev.com


Since 1975, O’Neill Development has been building and remodeling homes throughout the Metro area and Eastern Shore, including four architecturally themed communities. O’Neill Development’s impressive sustainable building resume includes net zero and net zero ready homes and the first passive house and the first passive modular built in this region.

Our work:

Courtesy photo

O’Neill specializes in custom residential work, providing extensive pre-construction and construction services including help in realistic budgeting, architect selection, design development, and problem solving during early planning stages; management by strict agenda and site control during construction; and thorough after-market service.

Since 1975, O’Neill has been known for traditional architectural styling and construction; and recently has expanded its portfolio into sustainable building and design, including passive and net zero ready building and contemporary designs.

In all custom work performed, O’Neill stresses transparency and teamwork to achieve a successful project. O’Neill is fortunate to work with some of the best architects in the region and beyond, and selects subcontractors and suppliers for their quality, dependability, and fair pricing.

O’Neill’s project managers represent over 80 years of building and management experience. In a high turnover industry, O’Neill is unusual with an average employment tenure of over 20 years.

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