A customer parking only sign restricts a private parking lot to active customers of the property's businesses, with non-customer vehicles subject to tow-away under Oregon ORS 98.812. Best-practice posting requires the sign at every vehicular entrance with mount height of 7 feet to bottom of sign, 12 by 18 inches minimum (18 by 24 preferred at high-volume entrances), and tow-contractor name and 24-hour phone number embedded on the sign. The legend ranges from a simple "CUSTOMER PARKING ONLY" to a layered "CUSTOMER PARKING ONLY -- 2 HOUR LIMIT -- VIOLATORS TOWED AT OWNER'S EXPENSE PER ORS 98.812."
This guide walks the posting protocols our crew at Cojo recommends for retail centers, standalone stores, and customer-facing service businesses across Oregon. It covers sign wording, posting density, time-of-day restrictions, and the enforcement chain that makes the sign actually do its job.
What does a customer-only sign accomplish?
The sign converts the parking lot from default-public-use to default-customer-only, making non-customer parking enforceable under ORS 98.812. Without the sign, a property owner has weak grounds to tow non-customers because the lot's use is ambiguous. With proper signage, the property has clear authority to tow vehicles parked while their drivers are not at the property's businesses.
Common scenarios where customer-only signage is needed:
- Standalone retail with downtown or transit-adjacent location where non-customer parking creeps in
- Coffee shops and restaurants near commuter lots where workers park and walk to nearby offices
- Strip malls adjacent to apartment complexes where tenants overflow into retail parking
- Healthcare offices where patients of neighboring practices use spillover stalls
- Retail near event venues where game-day or concert parkers spill onto adjacent lots
What's the right legend on a customer-only sign?
The legend depends on how aggressive the enforcement needs to be. Three common patterns:
Soft enforcement -- communication only
> CUSTOMER PARKING ONLY > Reserved for [Property Name] customers > Thank you for shopping with us
This works at well-populated retail with good organic traffic flow. It does not provide tow authority -- it sets expectations and communicates the property's position.
Standard enforcement -- ORS 98.812 baseline
> CUSTOMER PARKING ONLY > VIOLATORS WILL BE TOWED AT OWNER'S EXPENSE > PER ORS 98.812 > Acme Towing -- 503-555-1234
This is the everyday spec for retail centers and standalone stores in Oregon. It provides full tow authority and meets the ORS 98.812 "reasonably calculated to provide notice" standard.
Aggressive enforcement -- time-limited and active monitoring
> CUSTOMER PARKING ONLY > 2 HOUR LIMIT -- ACTIVE MONITORING > VIOLATORS TOWED AT OWNER'S EXPENSE > PER ORS 98.812 > Acme Towing -- 503-555-1234
The combined customer-only + time-limit + active-monitoring layered messaging is what works at high-volume downtown locations and transit-adjacent retail. This requires a chalk-and-tow contractor or LPR camera infrastructure to enforce the time limit.
How does posting density work for customer-only signs?
Standard ORS 98.812 posting density applies:
- Every vehicular entrance. A retail center with two entrances needs two signs minimum.
- At intervals along the property frontage. Long frontage that allows unmarked vehicle entry needs additional signs at 100 foot maximum spacing.
- At the property edge bordering known overflow risk. A retail center adjacent to an apartment complex or office building needs signs along that property line.
- Optional -- at the head of every parking row. Multi-row lots benefit from supplementary signs at the head of each row.
For a 14,000 square foot Hillsboro retail center we restriped in March 2026, we posted 5 customer-only signs: 2 at the two vehicular entrances, 2 along the 180 foot Cornell Road frontage, and 1 at the side property line bordering an apartment complex.
What size and grade does a customer-only sign need?
Standard practical spec:
| Spec element | Standard |
|---|---|
| Sign size minimum | 12 x 18 inches |
| Sign size at high-volume entries | 18 x 24 inches |
| Letter height (primary "CUSTOMER PARKING ONLY") | 3 inches minimum |
| Letter height (tow-warning supplement) | 1.5 to 2 inches |
| Letter height (statute citation, phone) | 1 inch minimum |
| Sheeting grade | ASTM D4956 Type III HIP minimum |
| Mount height to bottom of sign | 7 feet minimum |
| Background color | White |
| Legend color | Black with red "CUSTOMER PARKING ONLY" header (most common) |
How does customer-only signage interact with tenant-only signage?
Properties with mixed retail tenants and reserved tenant stalls layer signage:
- Property-entry sign. "CUSTOMER PARKING ONLY -- VIOLATORS TOWED PER ORS 98.812" at the entrance.
- Reserved-tenant row sign. "RESERVED -- TENANT PARKING ONLY" at the head of any tenant-reserved row.
- Time-limit sign at high-turnover zones. "30 MINUTE PARKING -- CUSTOMER PICKUP" at curbside pickup zones.
The layering prevents conflict between general customer parking and protected tenant parking. See our tenant parking only sign spec for the multi-family and HOA variant.
What about retail centers with multiple businesses?
Multi-tenant retail strips need carefully worded signage to avoid conflict between tenants:
- "CUSTOMER PARKING ONLY -- ACTIVE PATRONS OF [Property Name] BUSINESSES"
- "CUSTOMER PARKING -- PATRONS OF GROUND-FLOOR RETAIL ONLY" (when upstairs tenants have reserved sections)
- Avoid naming individual tenants on the sign -- tenant turnover means sign turnover
The sign legend should reference the property as a whole, not individual businesses. This avoids the awkward case where a tenant moves out and the sign references a no-longer-existing business.
Industry Baseline Range
| Component | Cost per sign / per zone |
|---|---|
| 12 x 18 customer-only sign HIP Type III | $42 to $68 |
| 18 x 24 customer-only sign with tow language | $58 to $96 |
| 24 x 30 entrance customer-only sign | $86 to $138 |
| Custom screen-print with tow contractor info | $14 to $28 per sign upcharge |
| Sign post and footing (installed) | $244 to $410 |
| Full retail center customer-only signage (5 signs + 3 posts) | $1,640 to $2,640 |
Current Market Reality
Custom screen-print with tow contractor info has stabilized at minimum order quantities of 4 to 6 units. Reflective sheeting prices climbed 4 to 6 percent annually from 2023 to mid-2026. The biggest cost driver on customer-only signage is the number of entrance and frontage signs required -- a corner-lot retail with 4 access points needs roughly 2x the signage of a single-entrance center.
Real install reference -- Beaverton multi-tenant retail strip
In February 2026, our crew installed customer-only signage on a 16,000 square foot Beaverton retail strip with recurring weekday-morning commuter parking from a nearby light-rail station.
Spec delivered:
- 4 customer-only signs at 18 x 24 HIP Type III with custom screen-print
- 2 at the two vehicular entrances on Murray Boulevard and SW 3rd Street
- 2 along the 200 foot Murray Boulevard frontage at 100 foot intervals
- 7.5 foot post-mount on hot-dip galvanized 2.375 inch round posts
- Legend: "CUSTOMER PARKING ONLY -- VIOLATORS TOWED AT OWNER'S EXPENSE -- PER ORS 98.812 -- Acme Towing 503-555-1212"
- 2 supplementary "30 MIN PARKING" signs at the curbside coffee-shop pickup zone
Total: $2,180 installed. The property contracted with a chalk-and-tow service for daily morning rounds. Commuter parking dropped from 14 to 18 cars per weekday morning to under 3.
Common customer-only sign mistakes
- "CUSTOMER PARKING ONLY" without tow-authority language. Cannot be enforced under ORS 98.812.
- Tow contractor name omitted from the sign. Required by ORS 98.812 -- without it the tow company will not execute.
- Mount height under 7 feet. Parked vehicles block the sign and undermine enforceability.
- Naming individual tenant businesses on the sign. Tenant turnover invalidates the sign within months.
- Letter height under 3 inches on the primary legend. Case law has held smaller letters not "reasonably calculated to provide notice."
- Stale sheeting older than 10 years. Faded sheeting weakens enforceability.
For broader category context, see our parking sign buyer's guide hub, the ORS 98.812 private property sign wording reference, and the parking sign installation in Portland city page for retail installs in the Portland metro.
Customer parking only sign FAQ
Is "CUSTOMER PARKING ONLY" enforceable in Oregon? Yes when paired with the right ORS 98.812 layered language and tow-contractor info on the sign. A bare "CUSTOMER PARKING ONLY" sign is communication-only, not enforcement. Adding "VIOLATORS WILL BE TOWED AT OWNER'S EXPENSE -- PER ORS 98.812 -- [Tow Company Name and Phone]" converts it to an enforceable sign.
How do I prevent commuter parking at my retail center? Three steps. First, install ORS 98.812-compliant customer-only signage at every entrance. Second, contract with a licensed Oregon tow company and put their name and phone on the signs. Third, contract with a chalk-and-tow or LPR-camera enforcement contractor for daily monitoring during peak commuter hours. Without active monitoring, the signage alone catches only egregious violators.
Can I time-limit my customer parking? Yes. Time-restricted customer parking ("CUSTOMER PARKING -- 2 HOUR LIMIT") is enforceable under ORS 98.812 if the sign is properly worded. Time-limit enforcement requires monitoring infrastructure (chalk-and-tow contractor or LPR camera) because tow contractors will not execute on time-limit violations without dated documentation.
Do I need a customer-only sign at a multi-tenant retail strip? Strongly recommended. Multi-tenant strips face overflow from neighboring properties (apartments, offices, transit) and customer-only signage is the legal foundation for towing non-customers. Use property-wide language ("CUSTOMER PARKING ONLY -- PATRONS OF [Property Name]") rather than tenant-specific names to avoid sign turnover with tenant changes.
What's the difference between a customer parking only sign and a private property sign? Both reference ORS 98.812 tow authority. The customer-only sign explicitly communicates the property's intended use as customer-serving and frames the restriction as customer access. A private property sign is more generic ("PRIVATE PROPERTY -- NO PARKING") and is appropriate at locations not serving customers (warehouses, fenced storage, vacant property). Customer-only is the right spec for retail and customer-facing commercial property.