Grand Junction, CO Building Setbacks & Zoning: Lot Coverage Limits (2026)

Lot coverage measures how much of a lot's area is occupied by structures: GJMC § 21.14.020 defines it as the percentage of the total lot area covered by structures, calculated by dividing the square footage of structure coverage by the square footage of the lot. Grand Junction sets a separate maximum in the dimensional standards table for each of its residential zone districts under Chapter 21.03.050, rather than one citywide figure.

At the low end, the Residential Rural (R-R) district, reserved for large-lot single-unit dwellings and low-intensity agricultural operations on lots of at least 5 acres, limits lot coverage to just 5% under § 21.03.050(d). At the other end of the residential range, the Residential Low 4 (RL-4) district, applied to typical single-unit and duplex lots as small as 7,000 square feet, allows up to 50% lot coverage under § 21.03.050(h). Denser districts such as Residential Medium and Residential High carry their own maximums listed in the same chapter's dimensional tables, again keyed to the applicable zone district.

Lot coverage is calculated for the whole parcel and applies to principal and accessory structures alike, so a detached garage, shed or accessory dwelling unit counts against the same percentage cap as the house itself. A property owner proposing a project that would exceed the applicable percentage must either redesign the structure or pursue the dimensional adjustment procedures in Chapter 21.03.040, administered by the Community Development Department.