San Marcos, CA Building Setbacks & Zoning: Structure Height Limits (2026)

Section 20.300.050(A) of the Zoning Ordinance sets the general rule: no building or structure may be erected, reconstructed, or structurally altered to exceed the height limit set for its zone, and architectural features such as chimneys, elevators, dormer windows, and tanks are measured from finished grade to the top of the feature and still cannot exceed that zone maximum. Table 20.215-3 (Residential Development Standards, Section 20.215.050) applies that rule to the R-1-20, R-1-10, R-1-7.5 and R-2 zones, all of which are capped at 35 feet or 2 stories, whichever is less, citing Section 20.300.050.A directly in the table.

Table 20.215-4 sets a higher ceiling for multifamily zones: R-3-6 tops out at 45 feet or 3 stories, while R-3-10 stays at 35 feet or 2 stories. Section 20.300.050(A)(2) creates one exception: an additional story is permitted on the downhill side of a building on lots with an average slope steeper than a 1:7 rise-to-run ratio, or where no established grade exists at the property line because of slope, but that extra story and the building's overall design must go through Chapter 20.260 (Ridgeline Protection and Management Overlay Zone) review.

Commercial zones are capped separately and higher under Table 20.220-3: 60 feet/5 stories in the C zone, 27 feet/2 stories in NC, 35 feet/3 stories in OP, and 50 feet/4 stories in SR, with architectural features allowed up to an additional 10 feet in most of those zones.