Can you install a new hardwood sports floor without removing the old floor?

Sometimes, but only after a project-specific technical assessment. An existing floor can serve as a base only if its construction is stable, dry, sufficiently flat, and capable of supporting the new system and expected loads.

The assessment must identify the old floor and any concealed resilient layers, moisture barriers, voids, damage, or movement. Additional build-up height can affect doors, thresholds, accessibility, bleachers, anchors, wall details, and adjoining surfaces. The combined construction must also be checked for moisture behavior, load distribution, acoustics, fire and building requirements, and the performance documentation required for the finished sports floor.

Do not assume that covering defects will solve them. Moisture, loose sections, contamination, or structural movement can remain active beneath the new installation and cause failure. Have the floor manufacturer, designer, and qualified installer agree on the substrate preparation and approved system before work begins. If the existing construction cannot be verified or brought within requirements, removal may be the more reliable option.