Those machines look like they are a bit too high. I wouldn't be able to put soap in my washer if it was placed that high.

Find a way to place machines the way you do laundry, or know you'll adapt. Can you put cabinetry between the two?

You will need to move them occasionally for servicing, so I would want what makes that easier.

Good thoughts. My real issue is, do w/d’s change in size frequently meaning, if you have to replace them you have to rip out the surrounding built-ins?

I think they have gotten larger over the years, or just more bulky overall. My new full size W/D have a curved front so they feel like they stick out and take up more room.

I just placed mine under a counter, so easy to pull out for service. Since they are full size, I shouldn't have an issue replacing them down the road, unless new ones get even bigger!

Too lazy to take an updated photo, but here is my laundry room during our build.

I think it's a bad idea to completely box them in. Do you want to tear up expensive custom cabinetry to get them out? You could get a lemon and have to remove it inside of a year, or they could last 10 years. In 10 years are they going to be the same size? Your guess is as good as mine. Look at the specs of the machines you are buying. We found the dryer door only opened one way (couldn't be switched to open in the other direction). Also, they tend to want to put the dryer on the outside wall because it vents to the outside. @chispa has a good idea. I didn't even put a counter on mine, but if you do you won't have to worry about socks falling down between them.

Slide-in appliances with a little wiggle room are a good idea…and i find lots of handy uses for open shelves above the washer and dryer as well…laundry rooms are usually pretty tight for wide opening doors in any case…we have shallower cabinets with small doors for easier access…they can be installed lower ….over a sink ..for instance…

Our uppers are 13”-14” deep and accessible…allowing them to be lowered to 14-15 above counters..lots more handy space to access easily

The picture you provided shows a very attractive laundry room and I can see why you would like it in your new home. I'd look at it from a budget perspective. Is this your forever home? An Electrolux w/d pair is around $2000 today. Let's say they last 10 to 15 years and when you go to replace them, they will be around $4000 to $6000 a pair. Also assume that the size will have changed and the custom cabinetry will have to be rebuilt to accommodate the new models. What would that be then, another $10,000 or even more? Is that something you would be willing to consider to spend, just to replace a washer and dryer? I know I would not, but I'm not in that tax bracket.

To be honest, I really don't understand the desire to make a laundry a fashion statement. I'm not saying it has to be a dingy corner in the basement but years ago, dressing up a laundry was including a Guy Gray box and perhaps some ceramic tile on the floor and walls. The picture above doesn't even include the mandatory crystal chandelier. With the very poor longevity record of modern appliances, I cannot see spending money on custom cabinetry to encase appliances that will fail much sooner than later. Unless, of course, you are in that tax bracket.