Locate the reference line before measuring a setback. A distance from the curb, a distance from the right-of-way boundary, and a distance from a property line answer different questions. Name the line and the part of the sign being measured on the site plan, rather than show a floating dimension labeled “setback.”
Separate the lines on the site plan
- Parcel boundary: the legal property boundary shown by the appropriate survey or recorded information.
- Right-of-way boundary: the limit of the road corridor. Establish its relationship to the parcel from the relevant records; do not assume every right-of-way has the same ownership arrangement.
- Curb or pavement edge: a visible physical feature that does not establish the legal boundary by itself.
- Easement: a separately identified area whose recorded terms need review for the proposed construction.
Use the adopted provision to identify the controlling line. Ask a surveyor or the road authority to resolve uncertain boundary locations. An aerial image or fence is useful for orientation but should not substitute for boundary evidence needed to stake the work.
A fictional plan-view measurement
This diagram is hypothetical, not to scale, and represents no actual code.It assumes the property and right-of-way boundary coincide. The curb is 12 feet from that boundary, the nearest cabinet edge is 6 feet inside the lot, and the support center is another 2 feet inward.
ROAD LOT
Curb ---- 12 ft ---- Boundary ---- 6 ft ---- Sign edge -- 2 ft -- Support
property/ROWIf the fictional requirement were 7 feet from the boundary to the nearest sign edge, this layout would miss it by 1 foot. An 8-foot measurement to the support would not cure that failure. Moving the complete assembly 1 foot inward would satisfy that one hypothetical distance, subject to every other constraint.
How one real code sets the distance
Austin, Texas measures sign setbacks from the street right-of-way and ties them to the size of the support, in section 25-10-191 of its Land Development Code. For example: “A sign support more than 12 inches and not more than 24 inches in diameter must be set back at least three feet from a street right-of-way.”
| Support diameter | Minimum setback from street right-of-way |
|---|---|
| 12 inches or less | None required |
| Over 12 up to 24 inches | 3 feet |
| Over 24 up to 36 inches | 5 feet |
| Over 36 inches | 12 feet |
Two more rules in the same section change the drawing. Any sign other than a wall sign within 12 feet of the right-of-way must be no more than 30 inches tall or have at least nine feet of clearance. And a sign that meets this section does not also have to meet building setbacks set elsewhere in the code. So in Austin, upsizing a post from 24 to 30 inches moves the sign two feet further back. (Section history ends with Ord. 20170817-072. We read it on September 28, 2026.)
Check the entire footprint
Ask whether the provision measures to the face, cabinet, support, foundation, or outermost projection. Draw these separately if their locations differ. For an angled or curved boundary, show the shortest applicable horizontal distance rather than a convenient diagonal. Include both street frontages on a corner lot.
Visibility is a separate check
A sight-distance check concerns what a driver can see, not just how far a support sits inside a lot. FHWA’s intersection-safety guidance explains how obstructions affect visibility at intersections. It supplies safety context, not a sign setback or a universal triangle dimension for this parcel.
Obtain the applicable driveway or intersection visibility requirements from the road authority. Ask for the measurement points, protected area or sight lines, and vertical limits. Overlay the complete sign and landscaping on the drawing. Do not manufacture a triangle from a remembered dimension or treat a setback pass as visibility approval.
Location checklist before excavation
- Confirm sign type, zoning, and site-specific approval conditions.
- Label each boundary, curb, easement, and proposed sign component.
- Show required and proposed distances together, with their reference points.
- Resolve visibility, utility, drainage, and access conflicts with the relevant parties.
- Coordinate utility locating and survey staking before digging; a permit drawing alone does not locate underground facilities.
Keep the approved location tied to the final dimensions. Increasing cabinet width can move its edge toward the boundary even when the pole stays in place. Recheck the layout and height measurement when the design changes.