The following is from the land use code I'm writing for my employers. This section on gas station design is in addition to architectural, landscaping and site design regulations that apply to all commercial uses.
412.3 Gas/service stations and co-branded uses
412.3.1 Architecture
* Separate structures (main building, car wash canopy, etc.) on the site must share architectural detail and design elements to provide a cohesive project site.
* The main building must not be prefabricated; prefabricated accessory buildings must be substantially modified and embellished to be consistent with the overall architectural theme.
* Vending machines and other site accessories must be integrated into the architectural theme of the site.
* Vehicle service areas and bays must be screened or sited so visibility from the street is as low as possible. Bay doors must not face the street or be visible from residential zoning districts. Bay doors must integrate into the overall design of the site with color, texture, and windows.
* Co-branded uses such as restaurants and convenience stores must be well integrated into the main building. Disharmonious architectural elements to emphasize the presence or corporate identity of a co-branded use, such as incorporation of a different façade or different roof pitch or profile than the rest of the main building, are prohibited.
* Canopies must include design elements found on the main building, including color, materials and roof pitch.
* Canopy support poles must include decorative corbels consistent with the overall architectural theme of the site, or pole covers ≥18” (.5 m) wide with a similar surface material and architectural treatments as the dominant masonry material on the main structure.
* Canopy fascias must be the same color as the dominant color of the main building. Striping and banding on canopies is prohibited.
412.3.2 Site planning
* Canopies must be placed behind the façade and street facing walls of the main building, so they are not the dominant feature on the site, and do not act as signs or attention-getting devices.
* Canopy footprints may cover 15% or less of the site.
* Tank vent pipes must be screened, placed in an inconspicuous location and painted a dark color, or included into the building architecture. Tank vent pipes must not be placed outside of the required building envelope.
412.3.3 Parking, circulation and stacking
* On-site circulation must include adequate space to maneuver vehicles around cars parked and stacked at pumps, with special attention to circulation of vehicles not involved in fuel purchases.
* Unrelieved pavement area on the site must be limited by using landscaping, contrasting colors and banding or pathways of brick pavers, textured concrete or similar treatment.
* Points of vehicle/pedestrian conflict must be clearly defined with textured and colored pavement or brick pavers.
* Large expanses of concrete or asphalt must be avoided.
412.3.4 Landscaping
Projects placed at street corners must provide some structural or strong design element to anchor the corner. This can be accomplished using a built element or strong landscaping features.
412.3.5 Fencing and screening
* Large trash containers, outdoor storage areas and vending machine areas must be fully screened.
* Vehicles under repair must be kept either inside a structure or in an area fully screened from the right-of-way and adjacent properties.
* Screen walls, trash enclosures and other service spaces must be constructed of materials and finishes consistent with the main building.
412.3.6 Signs
* Variances and waivers will not be issued for sign height, number and/or size, regardless of corporate standards or preferences, perceived need for visibility, and/or proximity to major highways.
* Signage ≤24’2 (2.2 m2) in area may be placed on each canopy side; with no signs permitted under a canopy except what is permitted by the “excepted signs” provisions of the Land Development Code sign requirements.
412.3.7 Outdoor lighting
* Awnings and canopy fascias must not be internally illuminated.
* Canopy lighting must conform to Land Development Code outdoor lighting requirements regarding recessed placement, number, luminosity and source type (§410.7).