That definitely doesn't sound normal. LG front loaders tend to be very smooth, so something is wrong. A few thoughts:

1. Double check that the appliances were reinstalled perfectly level.
2. Have you had an appliance repairman look at the washer to diagnose it?
3. When you relocated your laundry, did you do any structural reinforcement to the floor? That's usually necessary and could be why your whole house is vibrating. You're reaching a resonance point when you hit a certain RPM in the spin cycle.

It is possible for a particular mix of laundry to be difficult to balance, in spite of any sophisticated algorithms for attempted rebalancing. In such cases there will be vibration. On a concrete floor this only affects objects on top of the washer, although it may degrade the spin cycle to a lower rpm.

If the vibration from the washer is resonant with the natural frequencies of the structure of the floor, then vibration can be enhanced.

This subject was addressed more exhaustively, as I recall, in another thread here which the OP may wish to search for.

There exist elastomer type materials designed to reduce vibration of machine tools. These might be searched out if more common approaches fail or are impractical.

Unfortunately the floors were not reinforced and only tiled over. If there are low vibration washers out there that may be a more practical solution rather than opening up the floors again. We will get a technician to inspect the washer as well and see there is a problem. We just moved into the house so the washer came with the purchase and obviously the vibration wasn’t picked up during the home inspection - probably because the laundry was on the first floor corner at the time!

You don't have to necessarily open the floor. But you would need to remove the tile under the machine (not the whole room) down to the subfloor, then screw some 3/4" exterior plywood to the joists over the subfloor. Maybe two sheets. Then I'd paint it to match the file and put the machine back on top of it.

There are three washer functional options: (a) The washer vibrates with an unbalanced load at some spin speed, (b) the washer refuses to spin at high speed with an unbalanced load, and (c) (for Speed Queen FL, at least) the washer reverses direction several times to try to balance the load, reverting to (b) if unsuccessful. The SQ also has a spin drum balance device attached to it that will reduce vibration. I am unaware of any washers that can spin unbalanced and not transmit vibration to the floor, although I would be happy to learn otherwise.

Just read this from the manual!

@Emeka C Did a licensed contractor do the work to put the machines on the 2nd floor? If so, it's pretty disappointing if they did not advise you of the need for structural reinforcement, and I would be taking it up with them.

Is your laundry room in the middle of the house? The home of a friend of mine has the laundry room in the middle of the house. They had no problems until they bought a front load washer and "trampoline effect" caused her Whirlpool to move around during the spin cycle. It is right over one of the garage bays, so they couldn't put up poles to stabilize it.

our Miele FL will sometimes vibrate, and it sits right next to an outside wall. Miele bolts the washer to the matching dryer, so that's a plus. Nothing moves around, but it can vibrate quite a bit. It, too, sits over a garage bay.

Reducing flexure of the floor can be performed by adding joists, or by adding bridging from joist to joist, and even bridging from bridging to bridging. All these pieces would be screwed to each other, with the flooring and/or subflooring screwed down to the bridging. Less flexure might reduce transmitted vibration, but mostly would just spread it out or move its natural frequency.

Absorbing vibration can help, using elastomers designed for this purpose. One might try 'machinery leveling pads' search on www.mscdirect.com.

Thanks a lot for these comments. The contractor says they are not aware of any reinforcement that’s done when moving laundry rooms upstairs (not surprising I guess). Thanks a lot again - appears looking for top loaders with highly rated anti vibration to replace the current ones might be most practicable at this point.

My front load washer actually provided instructions for where to locate it; against an exterior or load bearing wall. This is so it is at the end of the joists, and not in the middle of a joists floor system. When the washer is in the middle of a joist span, it flexes like a trampoline at mentioned by @Cavimum above.

Thank you 👍🏽

Bubble-level doesn't have much relation to vibration. Reduction of vibration is primarily related to all four corners of the machine equally supporting the weight. However, a substandard floor structure can't be compensated by that. Whether the machine is absolutely 100% bubble-level and the weight equal on all four corners, any oscillation of the drum during spin will transmit into the floor.

Mfrog - was your Electrolux a top loader or front loader?

Front loader

Electrolux.

I moved into a new build 2 months ago with 2nd floor laundry. I do not know if the floor was reinforced but my FL LG spins very smoothly. No problems.

@Rachel - If I may ask, does your FL LG have Truebalance written on it? I have seen a few newer LG washers with the True Balance as an anti-vibration feature.