Foot-Candle Requirements by Property Type

There is no single foot-candle number that fits every property — the minimum your site must hit comes from your jurisdiction's code and the IES recommended practice it references, and it varies widely by use. A parking lot is typically designed to a 0.5–1.0 fc maintained minimum; a gas-station canopy is lit to 20–50 fc; a car dealership's display row runs just as high. The table below gives the typical maintained ranges by property type, each tied to the standard that sets it.

If you are scoping a project and trying to figure out how bright your site has to be, start here — then confirm the binding figure against your local code, because that is the number the plan reviewer checks.

What a foot-candle is

A foot-candle (fc) is the unit of illuminance — one lumen falling on one square foot of surface. It is the value a photometric plan reports at every point on its grid, and the unit each code threshold is written in. Exterior minimums are low by design: most parking areas target well under 1 fc maintained, while a fueling canopy or a dealership display lot is lit many times brighter.

Photometric plans usually shade those grid values on a color scale, so a reviewer can read coverage at a glance. The scale below is the one this site uses — and a useful way to learn how foot-candle values get judged.

Foot-candle requirements by property type

Here are the typical maintained foot-candle ranges by property type, each tied to the standard that governs it. Treat them as starting points: the binding figure is whatever your jurisdiction's code table lists, layered on the IES recommended practice. Every value is a maintained level — what the site reads after lamp depreciation and dirt, not on day one. The property type links to the matching service page.

Property type	Typical maintained foot-candles	What sets the number
Parking lot	0.5–1.0 fc min · 15:1 uniformity	ANSI/IES RP-8-25 + local code (SeaTac 0.5–7.5 fc)
Gas-station canopy	20–50 fc on the canopy task plane	Industry design targets; grade capped by code (SeaTac 1.0–5.5 fc)
Car dealership display lot	20–50 fc	IES DG-19 (automotive display)
Warehouse / industrial	3 fc active storage · 5 fc indoor & exits	OSHA 29 CFR 1926.56; exterior parking per RP-8-25
Restaurant & retail parking	0.5–1.0 fc min · 15:1 uniformity	ANSI/IES RP-8-25 + local design guidelines
Self-storage drive aisles	~1.0 fc min · ≤ 0.1 fc at residential line	RP-8-25; IDA/IES Model Lighting Ordinance

Two notes on reading the table. These are exterior, maintained values for the commercial property types we plan most often; interior workspaces and parking structures follow their own IES tables. And every range is jurisdiction-dependent — the standard sets the floor, your local code can raise it.

A closer look by property type

Parking lots

Most commercial parking lots are designed to a 0.5–1.0 fc maintained minimum with a 15:1 max-to-min uniformity ratio, anchored to ANSI/IES RP-8-25. Local tables tighten that — SeaTac holds its busier districts to 0.5–7.5 fc — and many codes cap spill at the property line near 0.1 fc. The parking lot requirements guide covers exactly what reviewers check.

Gas stations

Under the canopy, common industry design targets run 20–50 fc on the task plane so fueling and payment read clearly. At finished grade, municipal codes cap brightness — SeaTac to 1.0–5.5 fc, Pleasant Hill near 30 fc — and usually require canopy fixtures recessed, flush, or shielded to no more than 85° from vertical. A gas station photometric plan documents the canopy and the perimeter together.

Car dealerships

Display rows are lit to 20–50 fc maintained — several times an ordinary lot — consistent with IES DG-19 for automotive display. Customer and employee parking step back to standard commercial levels, and roadway frontage stays under the jurisdiction's trespass and glare limits, which is why a dealership plan is a multi-zone calculation rather than one grid.

Warehouses and industrial sites

OSHA 29 CFR 1926.56 sets workplace operational minimums — 3 fc for active storage areas and loading platforms, 5 fc for indoor warehouses, corridors, and exitways — while exterior circulation and parking follow the municipal table (SeaTac District 1: 0.5–7.5 fc, 15:1). The warehouse lighting design guide breaks down the interior zones.

Restaurants and retail

Retail and restaurant parking generally follows standard commercial criteria: a 0.5–1.0 fc maintained minimum, 15:1 or better uniformity, and full-cutoff or BUG-rated fixtures to control uplight and spill. Many retail jurisdictions — and private design covenants recorded against a parcel — add fixture-height and shielding rules that the retail plan documents alongside the municipal code.

Self-storage

Drive aisles between buildings are typically designed to a maintained minimum near 1.0 fc, with higher levels at the office and gate. The harder constraint is the perimeter — residential property lines are often capped near 0.1 fc — and the long linear boundaries of a storage site mean several trespass conditions get documented at once in the self-storage plan.

Why these are minimums, not targets

Every number above is a floor, not a goal. Two realities push a sound design above the minimum, and both are why a guess fails where a calculation passes.

Uniformity. A lot can hit its average and still fail review if the darkest point sits too far below the brightest. RP-8 and most codes cap the max-to-min ratio — commonly 15:1 for parking, with some municipal codes tightening it for fueling (SeaTac holds service stations to 4:1) — so you design the dim corners up rather than the bright spots down.

Light loss. Fixtures dim as they age and collect dirt, so plans calculate maintained foot-candles — initial output discounted by a light-loss factor. That is why a compliant plan looks slightly bright on day one. Designing exactly to the minimum is how a site ends up under it a year later.

How requirements get verified — the photometric plan

A foot-candle requirement is just a number until a photometric plan proves your specific layout meets it. The plan runs your fixtures, pole locations, and mounting heights against the site, reports the point-by-point grid and uniformity ratios, and documents the property line — the evidence a reviewer signs off on.

That is what our photometric plan service produces, manufacturer-agnostic, in 48 hours. Most commercial sites land in the $300–$2,500 range depending on the number of zones and the jurisdiction's code.

Frequently asked questions

How many foot-candles does a parking lot need?

Most commercial parking lots are designed to a maintained minimum of 0.5–1.0 fc with a max-to-min uniformity ratio near 15:1, but the binding number comes from your jurisdiction, not one national figure. ANSI/IES RP-8-25 is the recommended practice the plan calculates against; local tables layer on top.

How bright should a gas-station canopy be?

Common industry design targets run 20–50 fc on the canopy task plane so fueling and payment read clearly after dark. At finished grade, municipal codes then cap brightness — SeaTac limits service stations to 1.0–5.5 fc and Pleasant Hill caps it near 30 fc — and usually require canopy fixtures shielded to no more than 85° from vertical.

What foot-candle level does a car dealership display lot need?

Display rows are typically designed to 20–50 fc maintained — several times the 0.5–1.0 fc of an ordinary parking lot — consistent with IES DG-19 guidance for automotive display lighting. Customer and employee parking step back down to standard commercial levels.

Are these foot-candle numbers minimums or targets?

They are minimums — floors, not goals. A good design sits above them for two reasons: uniformity ratios cap how dark the dimmest point can be relative to the brightest, and light-loss factors account for fixtures dimming as they age. Plans calculate maintained foot-candles, so a compliant design looks slightly bright on day one.

Who sets foot-candle requirements?

Two layers. The IES publishes recommended practices — ANSI/IES RP-8-25 for roadway and parking lighting, IES DG-19 for dealerships — and your local jurisdiction adopts a code table on top, often with its own minimums, maximums, uniformity ratios, and property-line limits. For workplaces, OSHA sets separate operational minimums.

Checking requirements before you design? We produce the permit-ready plan that proves them. Request a quote with your site plan and we'll confirm scope and a fixed fee, usually the same day.