How to Connect Add-On Gondola Units into a Continuous Run

To connect add-on gondola units into a continuous run, build and level the starter, position the add-on beside it so the shared upright lines up, join the bases and uprights with the system's connectors, check for a flush line and level across both sections, then tighten everything and repeat for each further section. A good connection is invisible. A bad one shows up as a gap, a step or a wobble.

How add-on connections work

An add-on shares an upright with the unit beside it. The result is that two sections share one upright instead of having two side by side. The base of the add-on connects to the neighbor's base, usually through slots, plates or bolts, and the add-on's shelves carry the same line. Because systems differ, the manufacturer's instructions define the exact parts. This guide covers the logic and the checks. For the difference between unit types, see starter vs. add-on units.

Before you connect

1. Confirm compatibility. Same system, height, depth and finish. See compatibility guide.
2. Level the starter first. See how to level and stabilize gondola shelving.
3. Plan the run. Know how many add-ons you are connecting, and where the run ends. See how many sections you need.
4. Gather the connecting hardware. Plates, bolts, clips or connectors included with the add-on.
5. Empty the units if they are already stocked.

Step by step

1. Position the add-on. Place its base next to the starter's open end, with the shared upright aligned. A helper holds it steady.
2. Align the bases. The fronts of the bases should be flush. Check the line with a straightedge.
3. Join the bases. Use the connectors specified. Start with light tightening so you can adjust.
4. Attach the shared upright. Secure it to both sections according to the system.
5. Check plumb and level. Place the level on the add-on and across both sections. Adjust leveling feet as needed.
6. Install shelves and panels, keeping slot heights matched across the joint.
7. Tighten all hardware and verify nothing has shifted.
8. Repeat for the next add-on.
9. Finish the end with an end cap or closed end. See end caps explained.

Connection checks

Common connection problems

• Gap at the joint. Usually a floor step or a loose connector. Level each section separately and retighten.
• Step in the shelf line. The add-on is at a different level, or shelf clips are in different slots. Recount slots from the base.
• Mismatch in height. The wrong unit was ordered. Do not force it. Contact us.
• Wobble. Check leveling feet and connectors. See gondola shelving troubleshooting.

A worked example

A store owner connects three add-ons to a starter along a back wall. After leveling the starter, she positions the first add-on, aligns the bases flush, joins them lightly, adjusts one leveling foot, then tightens. She repeats for the second add-on, but a gap appears at the joint because the floor dips. She loosens, shims the low point with a proper shim, retightens and the gap closes. She finishes the run with an end cap and anchors the unit. The procedure takes time but is predictable.

Back-to-back and islands

Double-sided islands connect in the same way, with a shared center spine. For two single-sided units joined back to back, confirm that the system supports it and that the connection is rated for it. See single- vs. double-sided gondola shelving.

Extending later

If you add sections to an existing run, remove the end cap, connect the add-on and re-fit the cap. Check that the new unit matches. Keep notes on part numbers and finish for future orders. See moving and reconfiguring gondola shelving.

Frequently asked questions

Do I need special tools?

Usually basic hand tools and a level. Check your system.

Can I connect different brands?

Only with confirmation of compatibility.

Need add-ons?

Browse gondola shelving, wall units and island units, or call (609) 635-3005.