San Luis Obispo County, CA Tree Protection: Parkway Planting (2026)
Key Facts
- Baseline front setback
- 25 feet
- Reduced setback with parkway trees
- 15 feet
- Tree density required
- 1 street tree per 50 ft frontage
- Garage setback
- Still 25 feet minimum
- Governing section
- County Code Sec. 22.10.140.D.2.e
Summary
San Luis Obispo County lets a residential lot swap its full 25-foot front setback for a 15-foot setback when the parkway strip between curb and sidewalk carries at least one street tree per 50 feet of frontage plus turf or low-maintenance planting. County Code Sec. 22.10.140.D.2.e ties the incentive to on-the-ground tree density, not a discretionary finding, but the attached garage still must sit back a full 25 feet.
Where a lot is fronted by a fixed-width parkway between the curb and sidewalk, or meandering sidewalk that varies the parkway separation between the curb and the sidewalk, and where in either case the parkway is landscaped with one or more street tree for each 50 feet of frontage, and turf or low maintenance plants, the front setback may be reduced to a minimum of 15 feet for all portions of the residence except the garage. The garage shall have a minimum front setback of 25 feet.
Full Breakdown
140 sets the county's baseline residential front setback at 25 feet, intended to preserve open areas for visibility, traffic safety and fire safety. 2 lists exceptions to that baseline, and subsection e, titled Lots with parkways, is one of them. It applies where a lot fronts a fixed-width parkway between the curb and sidewalk, or a meandering sidewalk that varies the parkway width, and where that parkway strip is planted with one or more street trees for every 50 feet of lot frontage along with turf or low-maintenance groundcover.
Meeting that planting ratio lets the property owner build the residence, other than the garage, as close as 15 feet from the front property line, a 10-foot reduction from the standard 25-foot line. The garage is carved out of the reduction and must still be set back the full 25 feet, so the incentive only widens usable yard and floor-area options for the house itself, not for parking structures. 16 (Landscaping Standards), a parkway planting plan supporting this reduction is reviewed by the Planning and Building Department alongside the rest of the site's landscape plan, and the tree count is verified against the frontage measurement at that stage.
D lists sibling exceptions, including a 20-foot setback for shallow lots under 90 feet deep and a block-average adjustment where 25 percent of a block is already built out, so the parkway route is one of several ways an applicant can move off the 25-foot baseline.
Violations & Fines
There is no separate infraction here; the parkway trees are a condition of the reduced 15-foot setback, not a standalone duty. If a Planning and Building inspection finds the street-tree ratio was not installed or was later removed, or that a structure was built at 15 feet without meeting the one-tree-per-50-feet standard, the county can treat the structure as encroaching in an unapproved setback and require correction through code enforcement or a building permit modification.
Frequently Asked Questions
Does the reduced setback apply to the garage too?
How many trees does the parkway need?
Who reviews whether my parkway qualifies?
What if my lot is already shallow?
Sources & Official References
Other rules in San Luis Obispo County
California rules heatmap·Compare San Luis Obispo County to another location·View the California tree protection overview
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