Yes, you can bolt a street bench onto concrete, and for most city, park, or commercial jobs, that is exactly how it should be done. You do not have to excavate and set the bench legs in the ground unless the surface is soil, gravel, pavers, or asphalt. If you already have a solid concrete pad or sidewalk, bolting is usually stronger, cleaner, and easier to maintain.
But there are a few ifs. The concrete needs to be in good condition, at least 4 inches thick for a standard bench, and preferably reinforced. If the slab is cracked, spalling, or only a thin topping slab, anchors can pull out or break the edge. In that case, you either need to pour a proper footing or choose an in-ground installation.
The most common anchor types for this job are wedge anchors, sleeve anchors, and sometimes epoxy-set threaded rod. Wedge anchors are my go-to for solid concrete because they grip well and handle vibration. Sleeve anchors are easier to remove later, but they do not have quite the same holding power near the edge or in thin slabs. For heavy benches, high-traffic areas, or places where people may rock or yank the bench, epoxy anchors with stainless threaded rod are excellent because they create a strong chemical bond and resist moisture penetration.
Use stainless steel or hot-dip galvanized hardware. A street bench outdoors gets rain, snow, road splash, and sometimes salt. Zinc-plated anchors will rust and stain the concrete within a year or two.
Positioning matters more than people think. Do not place anchors too close to the edge of the slab. A good rule is to keep the anchor at least 2-1/2 to 3 inches from any edge, and in a slab that is at least 4 inches thick, drill no deeper than about 3-1/4 inches so you do not blow out the bottom. If possible, align the bench so each leg lands on solid concrete, not over expansion joints, saw cuts, or cracks. If a leg lands on a joint, the anchor may crack the slab when you tighten it.
You also want to keep water out. After drilling, blow or vacuum the dust out of the hole. Dust is the silent killer of anchor holding power. Then set the anchor, tighten the bench base down, and apply a bead of exterior-grade polyurethane sealant around the base plate or around the bolt heads. This keeps water from sitting in the hole, freezing, and slowly splitting the concrete.
If the bench has four legs with base plates, use all four mounting holes. If it only has two holes per plate and the bench is long or heavy, you can add a small steel plate or angle bracket to create another anchor point. On public benches, I usually use at least four anchors per bench, and more if it is a six-foot or eight-foot unit.
Do not use plastic wall plugs or small Tapcon screws for a street bench. A person sitting down gently may be fine, but people lean back, rock, stand on benches, and sometimes park bikes or skateboards on them. A street bench takes lateral and uplift force, not just downward weight. If the anchors are undersized, the bench will wobble in six months.
There are times when setting the bench in the ground is better. If the bench is on a lawn, dirt path, gravel, or an asphalt patch, bolting to a thin concrete pad does not make sense. In those cases, you either dig footings, set the legs in concrete, or install a buried concrete pad first and then bolt to it. The in-ground method hides the legs and can look cleaner in a garden or park setting, but it takes more labor, and you need to think about drainage, frost depth, and leveling.
For most urban installations with an existing concrete walkway or plaza, bolting is the right call. It is faster, easier to replace the bench later, and if you use stainless anchors and sealant, it will last for many years. Just check your local code or site spec first. Some municipalities require tamper-resistant hardware or a specific anchor embedment depth for public furniture.
So the short answer: yes, bolt it down. Use the right anchors, keep them away from edges, seal the holes, and do not treat a street bench like a lightweight patio chair.