Billboard Site Survey Checklist: What to Check Before You Pay for the Space

A billboard is rented for one reason only: to be seen by the right people often enough to change what they do. Everything in a site survey is a test of that sentence, and a site that fails it is expensive at any rent. The survey takes an hour on the ground and it is the most valuable hour in the whole campaign.

Start with the visibility distance. A billboard on a fast road needs to be readable from far enough away that a driver or passenger can read it, decide about it and still have time to act. A large panel on a highway has a long approach, while a panel on a congested city street may only be readable when the traffic stops, which is a different advertising opportunity and a different design.

Measure the approach from both directions. Many sites are only visible to traffic coming from one side, and the cost of the site should be weighed against the share of the traffic that can actually see it. A site on the left hand side of a busy road, read by everyone travelling one way, can be better value than a central site half hidden by a bus stop.

Record the obstructions precisely: trees that will grow, poles, cables, other billboards, a bridge, a building that blocks the angle at a particular distance, and any structure that will be built in the next year. Obstructions are the most common reason a rented site underperforms, and the reason is usually visible during the survey rather than afterwards.

Check the angle. A panel facing directly at the traffic is best, an angled panel is acceptable for a close approach, and a panel at a shallow angle to the road is read only briefly. The angle also determines the design: a shallow angle needs larger type and less detail because the reading time is short.

Note the lighting. An unlit panel is invisible from dusk onwards, which in Tanzania is a large part of the commuting day. A lit panel has a power supply, and the supply has to be checked: who pays for the electricity, whether the supply is metered, whether the light is on a timer, and what happens during a power cut. A billboard that is claimed to be illuminated and is not is a billboard that was priced wrongly.

Record the traffic honestly. Traffic volume estimates from a site owner should be treated as a claim rather than a measurement, and the survey can do better by counting for an hour at a peak time and an hour at an off peak time, noting the vehicles and the pedestrians. A pedestrian audience is relevant for some products and irrelevant for others, and the count should distinguish them.

Check the permitted size and the structure. The panel size is limited by the frame that exists, the permission that was granted and the wind load the structure can take. Using the existing frame is cheaper than building one, and a panel that fits an existing frame is a simpler job than a new structure. The survey should record the exact frame dimensions and the fixing points.

Confirm the permissions before paying. A site may require municipal approval, the landlord’s written consent and, on some roads, the approval of the road authority. Advertising space sold without the permission in place can be removed, and the campaign money is lost. The written permission, or a clear statement that the site owner holds it and will produce it, belongs in the paperwork before the payment.

Ask about the neighbours. A panel next to a competitor’s panel is not always a disadvantage, because both are seen, but a panel next to a large and bright competitor can be dominated. Look at what is already on the road: if the same audience sees five other panels on the same journey, the design has to work harder than the site alone suggests.

Measure the production cost as part of the site decision. A very large panel costs more to print, more to install and more to replace if it is damaged, and a small panel on a good site can be better value than a large panel on a poor one. The production quotation should be part of the comparison between sites, not a separate decision made later.

Consider the duration. Billboard pricing usually falls as the term lengthens, and a three month campaign costs less per month than a one month campaign. The trade is commitment, and the design should be planned for the term: a campaign that changes monthly needs a panel that can be reprinted cheaply, while a campaign running a year can use a more durable print.

Weather and maintenance belong in the survey as well. A panel exposed to the full coastal sun fades faster than one in the shade of a building, and a site with a history of storm damage will need more maintenance. The print specification, including UV protection, should reflect the exposure of the specific site.

The final test is the simplest. Stand at the site at the time of day when the target audience passes, look at the space the panel will occupy, and ask whether the message would be noticed by someone who is not looking for it. If the answer is no, the site is not cheap at any price, and the survey has just saved the campaign budget.

A written survey record makes the decision auditable. Photographs from each direction, the measured dimensions, the lighting and permission notes, the traffic counts and the production estimate together form a one page assessment that can be compared against other sites and revisited when the campaign is reviewed.

Viewability is not the same as traffic. A site can sit beside a road carrying tens of thousands of vehicles and still be seen by very few of them if the panel is angled away, obscured at the approach or placed where drivers are concentrating on a junction. The survey should separate the traffic count from the viewable traffic, and the second number is the one that matters for the campaign.

Dwell time is the variable that changes the design. A panel seen at a traffic light for forty seconds can carry a telephone number and a list of services, while a panel seen for three seconds at speed can carry a logo and four words. The survey should record whether the audience is stopped, slowing or moving, because that decides how much information the artwork can hold.

Digital screens change the economics but not the survey. A digital site sells time slots rather than a panel, and the audience sees several messages in rotation, which means each advertiser is seen for a fraction of the time. The survey of a digital site should record the rotation, the number of advertisers and the brightness at night, because a bright screen beside a dark road is read differently from a static panel.

Cost per thousand impressions is the number that makes sites comparable. The site rent for a month, divided by the estimated viewable audience for that month, gives a figure that can be compared across sites and across media. The estimate is imperfect, and it is far better than comparing rents, because a cheap site with a small audience can cost more per viewer than an expensive site with a large one.

The contract deserves the same attention as the site. The term, the payment schedule, the notice period, the responsibility for damage and the removal of the panel at the end of the term should all be written down. A campaign that ends with a panel still on a structure the advertiser no longer rents is a loose end that costs money and reputation.

Plan a mid campaign check. A static panel is inspected and photographed after installation and again halfway through the term, because weather, vandalism and a new obstruction can degrade the campaign silently. The check is cheap, and it is the difference between a campaign that ran as sold and a campaign that ran for three months with a torn corner nobody noticed.

Compare the site against the alternative media rather than only against other billboards. The same budget can buy a radio flight, a newspaper schedule, a social campaign or a set of bus shelter panels, and a billboard that cannot beat the alternatives on reach in the specific audience is not a good buy. The survey becomes more useful when it produces a number that can sit in that comparison.

Photograph the empty frame, the approach and the view from the pavement. The three images show the client what the site actually looks like, the artwork designer what the panel must compete with, and the installer what the fixing conditions are. A site survey without photographs is a set of opinions, and photographs settle most of the arguments that follow.

Write the survey up on one page and keep it for the next campaign. The site that was rejected this year may be right next year after a road change, and the site that performed well should be booked earlier the following season. The written record turns each campaign into a better decision than the last rather than a fresh search every time the budget is approved.

Vivid Measured prints and installs large format billboard and building wrap panels from the Muhoro Street, Jangwani workshop in Dar es Salaam, from small roadside panels to full building wraps, with the artwork prepared free, UV protection coating on outdoor print, and installation arranged with the structure owner. Where a client is choosing between sites, the workshop will produce a quotation for each so the production cost can be compared alongside the rent.

To price a panel, send the site location, the frame size in metres, the campaign dates and the artwork you have to WhatsApp +255 785 078 827. If the site is new, a photograph and the approximate dimensions of the frame are enough to start, and the workshop will confirm the print method, the finish and the installed price. Contracts, LPOs and tender documents are processed formally under BRELA Company No. 181095733.