O'Neill Development is a construction, remodeling and development firm that has been active in Maryland, Virginia and Washington D.C. since 1975. The company undertakes a broad spectrum of jobs from new and remodeled residential to land development, institutional, commercial and historic restoration.

New residential construction includes reproductions of historic houses, adaptations of period and geographic styles, copies of European classics, and modern adaptations of traditional styles. O'Neill has developed a number of small subdivisions each with a different architectural theme.

Residential remodeling work ranges from enhancing exterior architectural detail to "whole house" rehabilitation, including roof raising and house "moving." O'Neill has also done extensive historic restoration work.

Institutional and commercial work includes remodeling, new construction and tenant build-out.


Thank you for visiting our website. We welcome your interest and would gladly respond to any inquiries. We can be reached at 301-840-9310 x103 or info@oneilldev.com.


O'Neill recognizes the sound principles of sustainability and the importance of "Green Building" and is committed to best practices in this area.

Company News

New Home
O'Neill Development has begun construction on an exciting new home for sale at 106 Newlands Street in Chevy Chase. This "Old Chevy Chase" style house with cedar siding and clapboard will have 5 bedrooms on the 2nd floor with additional bedrooms on the third level and lower levels. Sales is being handled by Sondra Mulheron 301-785-9536 and Pam Schiattareggia 301-802-7796 Long and Foster Real Estate, Inc. www.HomesBySondraAndPam.com

Passive House
After successfully completing and selling the first "Passive House" in the Washington Metropolitan area, O'Neill Development, along with architect partner David Peabody, will begin construction on their second and third passive houses. One will be built in Rockville for an out of town client and the other will be a modular passive house under contract with the Housing Initiatives Partnership; for sale to a low/moderate income buyer in Prince Georges County. "Passive" construction involves a super insulated structure with constantly re-circulating fresh air and even temperatures throughout. A PH home uses roughly 90% less heating and cooling energy than the average home. It is designed as an integrated system, with site, energy, ventilation, air quality, humidity, health and comfort all taken into account. For further information on our Passive House initiative, go to our blog at: passivehouse.greenhaus.org.