How long does a home addition take in Silver Spring?

A home addition in Silver Springtypically runs 6 to 16 months from your first design conversation through move-in day, with a median of about 11 months, a range drawn from 159 completed MOSS addition projects across the DMV. That full span breaks into three distinct phases: design and selections (where architectural plans are developed and finish choices are locked in),permitting and approval, and then actual construction on your property. The on-site build is only one chapter of that timeline, not the whole story.

Where your project lands within that 6-to-16-month window depends on several converging factors. Scope and structural complexity matter enormously, a second-story addition over an existing footprint involves far more engineering than a straightforward rear bump-out. Montgomery County's permit reviewprocessadds a structured layer: once a complete application is submitted, initial review runs 10 to 15 business days, and any required revisions can add another 7 to 10 days per resubmission cycle. If your Silver Spring home sits near Kensington or Chevy Chase Village, proximity to historic areas may trigger additional review requirements. Beyond the county, HOA architectural review committees in some neighborhoods must sign off on exterior changes before a shovel touches the ground. On top of that, long-lead materials, custom windows, cabinetry, specialty doors, can stretch the schedule if they aren't ordered well in advance. Older housing stock in Silver Spring also has a way of producing surprises once walls open up, from outdated wiring to unexpected framing conditions that require design adjustments mid-project.

MOSS's design-buildmodel is structured specifically to compress that timeline wherever possible. Because our design, architecture, and construction teams work as a single unit rather than as separate firms handing off documents, we submit permit applications earlier in the process and avoid the delays that typically accumulate at handoff points. We use the design phase proactively, ordering long-lead materials before permits are even approved so they're on-site when construction begins rather than arriving weeks late. We also manage the Montgomery County permitting process entirely on your behalf, coordinating directly with plan reviewers and handling any resubmission cycles without putting that burden on you. The result is a schedule that moves with intention rather than waiting on avoidable gaps.