What are the standards for the size of outdoor billboards? 3 minutes to help you clarify the design foundation

What size should I set for an outdoor billboard? "- This is the most common question asked by countless brand owners when they first encounter outdoor advertising.

This question may seem simple, but it is difficult to answer directly with a single number. The size of outdoor billboards depends on multiple factors such as installation location, advertising type, viewing distance, and regulatory restrictions. The huge anti-aircraft guns next to highways, the lightboxes in bus shelters at bus stops, and the wall advertisements in commercial complexes vary greatly in size.

This article will systematically sort out the common sizes, design principles, and regulatory requirements of various outdoor billboards, helping you understand the size codes of this industry.

1、 Why are there no "uniform sizes" for outdoor billboards?
Before entering into specific numbers, it is necessary to first understand a core concept: the size of outdoor billboards is determined by the "scene".

The viewing distance determines the lower limit of the size. On the highway, when the audience is in a car traveling at a speed of 80 kilometers per hour and only has a few seconds to pay attention, the billboard must be large and eye-catching enough. At bus stops, pedestrians waiting for the bus can stay for tens of seconds, and billboards can be relatively smaller and carry more information.

The installation position determines the upper limit of the size. Roof advertising is limited by building structure, wall advertising is limited by wall area, and single column advertising is limited by land and height. Each location has its physical boundaries.

Regulations require determining the size red line. Local governments have clear size specifications for outdoor advertising, and special approval is required for exceeding the regulations. The management measures implemented in Hohhot City in 2026 clarify that facilities with a side length of more than 4 meters or a single-sided area of more than 10 square meters are considered "large-scale outdoor advertising facilities" and require special permission applications. The regulations of Jieyang City also define "any side with a length greater than 4 meters or a single-sided area greater than 10 square meters" as large-scale outdoor advertising.

So, there is no universal "standard size", only "common sizes" for specific scenarios.

2、 Mainstream outdoor billboard types and common sizes
2.1 Large single column billboard (anti-aircraft gun)
This is the most common form of advertising on highways and urban main roads, standing on both sides of the road facing rapidly moving traffic.

The classification in the 2024 plan of Dianjiang County is very typical:

Small: 6 meters long x 3 meters wide, column height 5 meters

Medium size: length 14 meters x width 5 meters, column height 10 meters

Large double-sided: 18 meters long by 6 meters wide, with a column height of 12.5 meters

Large three sided: length 18 meters x width 6 meters, column height 12.5 meters

Common specifications in the industry include variants such as 6-meter high x 18 meter long, 7-meter high x 21 meter long, etc. According to international standards, especially in North America, highway billboards are approximately 4.3 meters high by 14.6 meters wide.

Design points: For fast-moving traffic flow, information must be extremely concise and clear, with core demands recommended to be controlled within 7 words, mainly relying on large images and brand logos.

2.2 Bus shelter advertisements
Set at the bus stop, facing pedestrians waiting for buses and walking, the audience has a relatively long stopping time.

Common dimensions in Chinese Mainland:

Single sided/individual booth: typically ranging in height from 1.2 meters to 1.5 meters and width from 1.8 meters to 2 meters

Common specifications: 1.2m x 1.8m, 1.5m x 2m

Top lightbox: Sometimes there are more slender specifications, such as 0.5 meters high by 3.5 meters wide

Design points: Pedestrians are close in distance, take a long time, and can contain slightly more textual information and details, such as phone numbers, QR codes, etc. The size is relatively standardized and easy to produce.

2.3 Wall Advertising/Building Advertising
Directly installed on the exterior facade or roof of a building, the size is extremely variable, depending entirely on the size of the available walls.

Common spans:

Small wall advertisement: tens of square meters

Medium sized building advertisement: several hundred square meters

Large whole building coverage: up to 20 meters by 30 meters, or even thousands of square meters

Design points: It is necessary to consider the limitations of the building structure (windows, pipes, lines, etc.) and use the building itself as a carrier. The visual impact depends on the size and location of the building.

2.4 Large digital display screens/LED billboards
Located in the core commercial district, transportation hub, and large building facade of the city, it can play dynamic videos.

Physical dimensions:

Similar to traditional billboards, there are commonly various specifications such as 5 meters x 10 meters, 6 meters x 18 meters, 10 meters x 20 meters, etc

You can also customize irregular sizes according to the venue

Technical parameters are more important: When designing, more attention should be paid to pixel spacing (such as P10, P6, P4, etc., the smaller the number, the clearer it is) and resolution. The content should be designed according to the actual pixel size, rather than just looking at the physical size.

2.5 Small Billboards
Including sidewalk lightboxes, lamp post lightboxes, telephone booths, etc., with an area ranging from 1 square meter to 20 square meters.

According to statistics, small billboards in Beijing, Shanghai, and Guangzhou account for 86% of the total, widely penetrating various parts of the city. This type of billboard has the largest number and is the most commonly used form by local businesses.

3、 Size and Area Classification: Small, Medium, Large
For ease of understanding, the industry typically categorizes outdoor billboards into three types based on their area:

Small billboard: area 1-20 square meters. Including sidewalk lightboxes, lamp post lightboxes, telephone booths, car booths, etc. The widest distribution and largest quantity, suitable for local merchants.

Medium sized billboard: with an area of 21-249 square meters. Including roof, side, column style, etc., with better location and strong visual impact. Beijing has 912 yuan, Shanghai has 641 yuan, and Guangzhou has 1159 yuan, accounting for 13% of the total.

Large billboard: with an area exceeding 250 square meters. Distributed on large rooftops and roadsides, with a huge area and relatively few numbers. Beijing costs 56 yuan, Shanghai costs 106 yuan, and Guangzhou costs 51 yuan, accounting for only 1% of the total.

This category can help you quickly determine which level of billboard you need.

4、 Regulatory red line: size regulations that must be understood
Before determining the size, it is necessary to understand the regulatory requirements of the local government. The following are the latest key regulations for 2026:

Definition of Large Outdoor Advertising:

Hohhot City: Outdoor advertising facilities with a side length of 4 meters or more (including 4 meters) or a single-sided area of 10 square meters or more (including 10 square meters)

Jieyang City: Any side with a length greater than 4 meters or a single-sided area greater than 10 square meters

This means that if your billboard exceeds this size, you will need to apply for an Outdoor Advertising Permit from the city management department, submit structural design drawings, safety commitment letters, and other materials.

Set regional restrictions:

It is not allowed to set up buildings within the control zones of state organs, primary and secondary schools, cultural relics protection units, etc

Do not use traffic safety facilities or set up traffic signs

It shall not affect the use of municipal public facilities and fire-fighting facilities

Do not exceed the outer contour line of the building (structure) and the overhead part at the top

The 2026-2030 plan for Rongchang District further refines zoning control: the total advertising area in the display area should be less than 30% of the wall area, the control area should be less than 15%, and there are floor restrictions on the placement area of wall advertisements.

Temporary outdoor advertising: If an event requires the installation of a temporary large outdoor advertisement, it should be applied for in advance. The advertisement should be removed within two days after the event ends, and the maximum installation period should not exceed 90 days.

5、 Design points: considerations beyond size
Determining the size is only the first step, in order for the billboard to be truly effective, the following design principles need to be followed.

5.1 Viewing distance and font size
It is more convenient for the audience to see objects that are 5 meters above their head from a distance of 10 meters on the open square and sidewalks of the road. When determining the size, the position and size of the advertisement should be determined based on three factors: distance, perspective, and environment.

For highway billboards, the ratio of font height to viewing distance is approximately 1:200-1:300. This means that in order for drivers 100 meters away to see clearly, the font height needs to be at least 30-50 centimeters.

5.2 Principle of Simplicity
The target audience of outdoor advertising is pedestrians in motion, who receive information through visual advertising images. Pedestrians are unwilling to accept tedious visuals.

'Less is more' is an iron law. The more complex the visual image, the more chaotic the feeling it gives to the audience; The simpler the picture, the higher the consumer's attention value. The fast-moving audience only has a few seconds, and it is usually recommended that the core appeal should not exceed 7 words, the less the better.

5.3 Color and Contrast
Outdoor advertising should use colors with high contrast and strong recognition, paired with eye-catching font styles such as bold and large fonts. Maintaining clarity is crucial, especially under strong daylight and changes in nighttime lighting.

The text and background must have a strong contrast: bright text on a dark background or bright text on a dark background, avoiding the middle tone.

5.4 Reserve space for production and installation
When designing outdoor advertising promotional images, installation margins and structural reinforcement space should be reserved to avoid important content being obscured, while ensuring clarity and recognition.

Large advertising images are usually composed of multiple spliced pieces, and the position of the spliced seams should be considered during design to avoid key elements (such as faces and text) being segmented.

6、 Advice for Beginners
If you are new to outdoor billboards, the following suggestions may be helpful to you:

The first step is to clarify the scenario: where should the billboard be placed? Is it a highway roadside, urban main road, bus stop, or commercial complex? The position determines the size type.

Step 2, understand the regulations: Contact the local urban management or planning department to obtain specific size and height restrictions for the location. This is the most accurate way and the key to avoiding demolition.

Step three, consult a professional platform: Instead of exploring on your own, it's better to seek advice from a professional outdoor advertising platform. Tianci Media is a professional outdoor advertising platform with a database of outdoor media resources in major cities across the country. It can provide you with one-stop services from size planning, location selection, creative design, and publication execution.

Step four, reserve approval time: The approval of large outdoor advertisements requires time, and Hohhot city has a 20 day approval deadline, which can be extended by 10 days. Temporary activity advertisements need to be applied for 5 working days in advance. Be sure to plan ahead.

7、Conclusion
There is no standard answer for the size of outdoor billboards, but rather a composite variable determined by the type of advertisement, installation location, viewing distance, and regulatory requirements.

From the 18 meter by 6-meter giant anti-aircraft gun on the highway, to the 1.2-meter by 1.8-meter light box at the bus stop, and to the thousands of square meters of wall advertisements in commercial complexes, the size spectrum is wide. The key is to find the specification that best matches your advertising goals and budget size.

Successful design is about subtracting within size - using the simplest visuals to convey the most essential information. Successful advertising involves adding beyond size - complying with regulations, selecting the right location, and finding the right partners.

Tianci Media is a professional outdoor advertising platform that has been deeply involved in outdoor media for many years, with rich resource databases and advertising experience. From size planning and point evaluation to creative execution and effect tracking, we provide you with professional one-stop services, ensuring that every outdoor appearance you make is worth it.