OS Arch

For over 25 years we have been working to create architecturally innovative and technologically superior commercial and residential buildings in both Napa and Sonoma Counties.  We provide architectural and design consultation to some distinguished business and land owners.  Among them are Chuck McMinn (Vineyard 29 and Cru @ the Annex), Hugh Davies (Davies Family Vineyards), Larry McGuire (Nickel & Nickel – Fermentation Building), Janice & Marc Mondavi (Aloft Winery) and the Mazzoni Family (Zialena Winery).

After a long-time association as architects for Lail Design Group in St. Helena, we formed Osborn Siegert Architecture (os-arch) in the spring of 2011.  Together we have a partnership with the common goal of offering clients clear, objective and thoughtful alternatives.  We offer both the skills of experienced architectural professionals and the leadership to facilitate your projects.

clean, innovative design