The short answer is: you usually cannot attach a plaque yourself, but many cities have an official process for memorial benches. I looked into this when a family member wanted to honor someone, and the key is that most street benches are city-owned public property. That means you need permission before adding anything to them.
If you attach a plaque without approval, the city can remove it, and you may be charged for the removal or even fined, depending on local rules. So it is not a good idea to drill into a bench or use adhesive plaques on your own.
The good news is that commemorative benches are common. Many cities run a memorial bench or adopt-a-bench program through the parks department, public works department, or city clerk’s office. You typically ask about a memorial bench plaque or bench dedication, choose from available benches or park locations, and pay a fee. That fee usually covers the plaque, installation, and future maintenance. In small towns it may be a few hundred dollars; in larger cities or popular parks it can range from $1,000 to $5,000 or more.
The city usually orders the plaque from an approved vendor so it matches their size, material, and mounting standards. They may limit the number of characters, the wording, and whether you can include symbols, photos, or logos. Some cities restrict religious or political messages because the bench is on public land.
A few practical steps: identify the exact bench and location, find out who owns it, contact the local parks or public works department, ask if they have a memorial bench program, complete the application, pay the fee, and let the city install the plaque. If the bench is already dedicated to someone else, you generally cannot replace that plaque.
If the city does not allow plaques on existing benches, ask about alternatives such as memorial trees, brick pavers, park donations, or a plaque in a community garden, cemetery, or private property where the owner can approve it.
In short, do not attach it yourself. Call your city and ask about their memorial bench process. In most places, the answer is yes, but only if you go through the proper program. Rules vary by city, so always confirm locally.