When remodeling an older bathroom, it is natural to want to save where possible. But some areas should not be skipped, especially in bathrooms with leak history, loose tile, or bubbling walls.
Waterproofing is usually the first major priority
Even if the surface damage seems minor, waterproofing in an older bathroom may already be aging. Replacing finishes without addressing the layers underneath can allow leaks to continue later.
Shower zones and drainage need more than a surface review
Many issues in older bathrooms show up around shower pans, wall-floor transitions, drain areas, and tub edges. If demolition has already reached these zones, it is usually worth reviewing them together.
Substrate condition determines whether finish upgrades are worth it
If walls are damp, floors sound hollow, or framing shows water damage, repairing the base layers first is usually the safer path.