Replacing integrated dishwasher

Get the handyman who is going to plumb in the machine to order one that will fit the space.

JI did ours and did a really good job. It was all much less complicated than I had been expecting and the new one is so much better that I wish we had done it ages ago.

I was worried about replacing our fitted dishwasher because it was badly fitted in the beginning by the builders and it was a bottom end appliance, not our choice. I was concerned that it was too big for the space and was catching on adjoining units, which caused fascia door to keep falling off. Had local shop to survey, check the space, and bought from them and they fitted. They had no trouble apart from cutting a small piece out of the kick board at base of the units, because dishwasher has an ingenious light that shows timing on the floor when dishwasher operating. Brilliant, and door no longer falls off. Only downside so much more expensive than freestanding.

Have I understood correctly you are keeping the kitchen but replacing the integrated units?
So you have the doors for the integrated units and are concerned the new appliances might not fit.
I personally would take out the appliances and take measurements. you can't go wrong if you do this.
Most integrated appliances fit into a 600 wide space I believe non standard are usually American appliances.

The current appliance should have a serial/model number. If you Google that you will be able to get dimensions.

We replaced our integrated dishwasher with a normal size one, really easy. Just removed the integrated one and its door plus kick-guard/plinth, measured the space and a normal non-integrated one fitted perfectly.

We had an integrated dishwasher put in with our new kitchen a few years ago. The fitter muttered that it was such a tight fit getting it in that he hoped he wouldn’t have to be the one to take it out!! ?.