Bollard spacing at a dumpster enclosure is set by the hauler or city standard, not a national code. Most call for at least two bollards behind each container, about 1 ft off the back wall and 3 to 5 ft apart, standing 4 to 5 ft high. Where the fire code requires vehicle impact protection, posts are spaced no more than 4 ft on center.
What is the typical bollard spacing at a dumpster enclosure?
Typical bollard spacing at a dumpster enclosure is about 3 to 5 ft between the two bollards behind each container, with each bollard set roughly 1 ft off the back wall. No national code sets this number. It comes from the waste hauler's site standard or the city's standard detail, so the bollard spacing on your drawing should match the document that governs your site.
Published standards agree on the pattern and differ on the dimensions:
| Source | Bollards inside the enclosure | Layout dimensions | Bollard called for |
|---|---|---|---|
| A national hauler's site design standards (2024 copy) | At least two per container | 1 ft from the interior back wall and 4 ft from the interior sides, which leaves about 4 ft between the pair in a 12 ft wide single enclosure | At least 5 ft above grade |
| One city's enclosure specifications (2022) | Two at the back wall, one at each side wall, and separate bollards for the gates | Back pair 3 ft apart and 4 ft 6 in from each side wall in a 12 ft enclosure; 12 in from the rear wall to the bollard center; side bollards no more than 6 in from the wall to the bollard center | 6 in concrete-filled steel pipe, 4 ft above grade, embedded 2 ft and encased in 12 in of concrete all around |
| One city's enclosure guidelines (2023) | Two at the back wall and two along each side wall; steel pipe bollards at the gate hinge points | Back pair 5 ft apart and 4 ft from each side wall in a 13 ft single; 5 ft and 6 ft spacings in a 26 ft double | Steel pipe filled with concrete |
| A national hauler's regional enclosure guide (2024) | Pipe bollards along the back wall, wall bumpers 4 to 6 in wide and 6 in high, and bollards at the gates | 2 to 3 ft of clearance between the container and the walls | 6 in concrete-filled pipe, set in concrete 3 ft below grade, 4 ft above grade, painted safety yellow |
| One county's design practices booklet (2021) | Bollards or interior curb bumpers along the back wall | Not dimensioned | Bollards about 4 ft high, or curb bumpers 8 in high and 6 in wide |
The spread is real: 3 ft, 4 ft and 5 ft between the back pair, and 4 ft or 5 ft of height. Ask the hauler and the city for their written standard before you dimension anything.
Where do bollards go at a dumpster enclosure?
Bollards go where a container or a truck can reach something that cannot take the hit: the back wall, the side walls and the gate posts. Each position has its own job.
Behind each container
The back-wall pair stops the container before it reaches the wall. A front-load truck sets the container back down with its forks and can push it toward the back wall at every service. Two bollards per container, lined up with the container body, are the common rule. The hauler standard above places them 1 ft off the wall; one city measures 12 in from the wall to the bollard center.
Along the side walls
Side protection keeps a container that goes in crooked off the side walls. Some cities draw side bollards tight to the wall, and some haulers use a low continuous bumper instead. Either one takes space out of the interior, so check the clear width that is left.
At the gate posts and open leaves
Gate bollards protect the hinge posts, and sometimes the open leaves, from the truck. One city's sheet calls for separate bollards at the gates, and one hauler's plan shows bollards outside the enclosure at the gate line. Set them outside the clear opening and outside the swing arc. A bollard that narrows the opening can fail the hauler's width check, a point covered in the guide to dumpster enclosure gates and clear openings.
Next to compactors, meters and utilities
Compactors and nearby utilities follow their own rules. One city's compactor sheet notes that bollards may be required depending on the compactor design, placed 12 in behind the compactor box. Gas meters, transformers and fuel equipment near the enclosure are covered by the fire code and the utility, not by the hauler.
Do building or fire codes set bollard spacing requirements?
The model codes set bollard spacing requirements only where the code itself requires vehicle impact protection, and a trash enclosure is not on that list by default. The number most often quoted comes from the International Fire Code. 2024 IFC Section 312.2 applies where another section of the fire code calls for vehicle impact protection. It describes guard posts as:
- Steel, at least 4 in in diameter, and concrete filled.
- Spaced not more than 4 ft on center.
- Set at least 3 ft deep in a concrete footing at least 15 in in diameter.
- At least 3 ft above ground.
- At least 3 ft from the protected object.
Section 312.3 also permits other approved barriers. If the AHJ has no bollard detail of its own, these values are a common reference point, but the reviewer decides whether they apply to an enclosure.
Accessibility sets the other limit. Where bollards cross an accessible route, the 2010 ADA Standards, Section 403.5.1, require a walking surface at least 36 in wide, with a reduction to 32 in allowed for no more than 24 in of length. That is clear width between bollard faces, not center-to-center spacing. A pedestrian gate or a path to the enclosure must keep it.
How much room do bollards take from the enclosure?
Bollards take about 1 to 1.5 ft of depth at the back wall, and that depth has to be added to the interior, not borrowed from the container clearance. A 6 in bollard set 1 ft off the wall puts its front face well over a foot into the enclosure, and the container stops there.
Check three dimensions on the plan:
- Depth. Container depth, plus the front clearance to the gates, plus the bollard zone. The hauler standard above asks for 11 ft of interior depth and 2 ft of front-to-back clearance.
- Width. The same standard asks for 2.5 ft between the container and each side wall. Side bollards or bumpers must not take that space.
- Gate line. The clear opening is measured after gates, posts and hardware are installed. Gate bollards sit outside that width.
Write the reference on each dimension, to the bollard center or to its face. The standards above use both.
How are dumpster bollards built and founded?
Most standards call for a 6 in steel pipe bollard, usually concrete filled, standing 4 to 5 ft above grade in its own concrete footing. The details differ more than the diameter does.
- Fill. Most sheets call for concrete fill. One city parks department's standard detail does the opposite: a 6 in pipe with a welded cap, left empty.
- Embedment. Published depths run from 2 ft, encased in 12 in of concrete all around, to 3 ft in one hauler's guide, to 3 ft 6 in in an 18 in concrete base in the parks detail.
- Height. 4 ft is the most common figure; one hauler sets a 5 ft minimum.
- Finish. One hauler's guide calls for safety yellow, and the parks detail calls for black, verified with the owner. Confirm the color with the owner and the hauler.
Bollard footings and enclosure footings share the same ground. Show both on the slab drawing, so a bollard footing does not land on a post footing, a thickened slab edge or a cane bolt sleeve. A bollard cast into a slab also passes its load into that slab, so the project engineer should decide how the two are joined or separated. The dumpster pad design guide covers slab thickness and the apron.
Does a steel enclosure need bollards?
A steel slat enclosure needs bollards in the same places a masonry one does, and for one more reason: it is a visual screen, not a vehicle barrier. Standards written around block walls still add bollards, because a loaded container can damage block, caps and finishes. On a post-and-slat system, the bollards keep the container off the posts and the slat face.
Alpine Citadel is a structural steel screen wall and enclosure system with no vehicle-impact or crash rating, and Alpine makes none for its bollards. Bollards are offered as an option, laid out on the same drawing as the posts, base plates and gates. A typical configuration puts 4 in square posts on base plates anchored to the slab, with the slab thickened at the posts, so bollard footings are coordinated with those locations and with the project engineer's slab design. The slats are captive slide-in members, and spare slats are included in every kit. See the structural steel enclosure options for what else can be added.
How should a multi-site program standardize bollards?
A multi-site program should fix the bollard itself and let the layout follow each site's hauler and city. For brand construction teams and prototype architects, that usually means:
- One bollard detail in the prototype: diameter, fill, height, embedment and color.
- A default layout drawn to the strictest hauler standard in the program's markets. Two bollards per container, 1 ft off the back wall, matches the hauler standard and the first city sheet above.
- A site-adapt check: the city's standard detail, the hauler's written standard, and any utility or compactor next to the enclosure.
- Interior depth in the prototype that already includes the bollard zone, so a site adaptation does not lose container clearance.
The article on a trash enclosure standard for multi-site rollouts covers the rest of the prototype decisions.
Next step
Send your site plan, the container count and the hauler's standard through request a quote. Alpine will lay out the enclosure with the bollard positions shown, and the project engineer and your AHJ make the final decisions on foundations and approval.
Sources
- Republic Services, Site Design Standards for Solid Waste Containers (copy published by a municipality, 2024).
- WM, Commercial Container Enclosures (regional guide, 2024).
- City of Albuquerque Solid Waste Management Department, Enclosure specifications (2022).
- City of McAllen, Enclosure Guidelines, Details 401 to 404 (2023).
- City of Dallas Park and Recreation Department, Standard Construction Detail E-11, Dumpster Enclosure Plan and Bollard Section (2012).
- Lee County Solid Waste, Solid Waste Enclosures Best Design Practices (2021).
- International Code Council, 2024 International Fire Code, Section 312 Vehicle Impact Protection (2024).
- U.S. Access Board, 2010 ADA Standards for Accessible Design, Section 403.5.1 Clear Width (2010).