If you question is more construction related and the potential for water leaking down into the first floor, then I guess that would be an issue if a pipe break ever did occur. However, this would be true of any showers / baths / toilets that leak on a 2nd story as well. They all have the potential to be a problem, but it properly maintained and you can fix a problem quickly then it's a non-issue.
The bigger concern or item you might want to consider is the come resale time a 1 story home is generally more marektable than a 2 story home since less people want to or are able to climb stairs.
Just my 2 cents.
To answer your question, the washer and dryer upstairs does not mean red flag. Of course anything can happen, it could leak downstairs as well. The key to ensuring your washer is stable is to get a home inspection, and/or putting a pan underneath it as the hot water heater has.. Even if it is new Construction a home inspection can still apply. Of course it is solely out of your pocket, but builders miss things as well as in a preowned home. The upstairs washer and dryer is just another innovative idea that changes up a floor plan, as well as it keeps the laundry upstairs away from company or something sours its in more private, personal area. You would hate to have company over and the laundry room door got left open. Nine times out of ten you wont be entertaining upstairs where your bedrooms are. From what I have seen in the new homes with this option, the laundry room is secluded and you wouldnt be in it unless you know its there. They are also a lot larger being upstairs. With all things in purchasing a home is a risk. Just because the cover plates cover the electrical wiring doesnt mean theres not something faulty behind it, or the GFCI with the plugs. So not to alarm you, but for you to understand that anything can happen. Dont walk in thinking negative because its something different. I can see why that question would be of alarm if a leak was to form. I do know that you will have a 10 year builder warranty and ceiling to floor wall to wall your first year. You would definitely have time to see if a leak forms in a years time. But having an Agent with the proper tools to walk you through the process and answer all these great questions is key. Give me a call. I would be happy to make an appointment and assist you with your purchase. Dont be afraid to buy.. becoming a homeowner is wonderful!
Exit Homevets Realty
2000 E Centex Expwy Suite B
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254 317 2978
If placed on the second floor, you need to make sure the washing machine is set on a pan in order to catch any possible leaks in the future.
It's also good to have a water turnoff valve so you can turn it off when not in use, or , especially if you're away for an extended period of time.
Probably not a bad idea upstairs or downstairs to check the connections every month.
I'm sure no one does this, but probably good practice either way.
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One last note, I have heard on rare occasion where the washer tends to rock forward but this is usually not the issue when a home has more sturdy flooring built in washrooms.
Ultimately, it comes down to personal preference.