How long does a home addition take in Kensington?

A home addition in Kensingtontypically runs 6 to 16 months from your first design conversation to move-in day, with a median of around 11 months, figures drawn from 159 completed MOSS additions across the DMV region. That span covers three distinct phases: design and selections (usually 2 to 4 months),permitting and approval (typically 1 to 3 months), and on-site construction. The actual build is only one chapter of the overall timeline, and understanding the full arc helps set realistic expectations from the start.

Where your project lands in that 6-to-16-month range depends on several factors specific to Kensington. Scope and structural complexity are the biggest drivers, a straightforward single-story addition moves faster than a two-story addition requiring new foundation work or significant structural engineering. Montgomery County's Department of Permitting Services typically takes 20 to 30 business days to issue a permit after a complete submission, and if plan revisions are required, each review cycle can add another 7 to 10 days. If your home falls within Kensington's Historic District, exterior alterations also require review by the Historic Preservation Commission, which adds another layer to the approval timeline. Beyond permitting, long-lead materials like custom cabinetry and windows can take 10 to 16 weeks to arrive, and older Kensington housing stock occasionally surfaces surprises, aging mechanicals, unexpected structural conditions, once walls open up.

MOSS's design-build model is structured to compress that timeline wherever possible. Because our designers, architects, and production team work under one roof, decisions made in design flow directly into permit drawings without the handoff delays that slow traditional design-bid-build projects. We submit for permits as early in the processas possible and use the review window to order long-lead materials, so fabrication is underway while approvals are pending rather than after. Our familiarity with Montgomery County's permitting process, and with historic preservation review in districts similar to Kensington's, means we anticipate reviewer questions before they become revision cycles, keeping your project on track from the first conversation to the final walkthrough.