Is it a finished surface (like tile) or raw concrete? If raw when you finish it the floor can be leveled prior to installing finished floor. All floors are a little out of level, how much is a little?

I would have to attach photos so you can see. Which i will do soon. But its concrete. There are some cracks in the middle that go all the way across. But there not wide enough to be a concern. But the middle of the floor is raised. Its under warranty for a year. And the guy that came to look at it disregarded it and told me to keep an eye on it. Would they have to re pour? Is that why they aren't correcting it?

Be sure to document all of your contacts and conversations with them about this, in case you do have to try to get them to honor the warranty later. You need to be able to prove that you raised concerns early on. Emails are best IMO.

Why do you say the cracks aren’t wide enough to be a concern? Where did that come from?

Yes, if there is something wrong, it could be expensive to fix. You should call around to structural engineer to see what the charge would be to inspect the floor. If it’s only a couple hundred dollars, it might be worth it for piece of mind.

https://www.concreteconstruction.net/how-to/heaving-floor-in-basement_o

All concrete cracks. All concrete not intended as a fine finished surface is not 100% level. You have a normal concrete basement floor. If you want to convert it to living space, you’ll have to do the completely normal prep on the floor. That means grinding down the high spots and filling the low spots. That too is normal and expected if you want to put a finished floor on it.

In the warranty book it says if a slope exceeds 3/8 in with a 32 in measurement its not a deficiency. Im not sure if its with in or beyond that. Ill have to find someone to help me with that. I hope they acknowledge and correct it. But I knew the builders would disregard my claim.

Do you have a drain in your concrete floor? If so it is not supposed to be level. It is purposely slanted to channel water to the drain.

I must live in a different part of the country than Live_wire_oak. The basement floor should be level and flat except for a slope toward a drain I don't know anyone who had to fix the floor of a new build to finish their basement or even in homes built in the 1950s. Old homes (1800s, early 1900s) need floor leveling before finishing (sometimes need a floor,) I am in central PA and many builders/tradesmen are Amish.

The basement floors wont be perfectly level like a finished floor, , so it will be helpful to have a picture. But the comments by the construction crew don’t bode well, hopefully they were being over dramatic and everything is fine. There are small strain gauges you can put on cracks to measure if they’re growing, you could see if the builder will install those for piece of mind

I would need to see exactly what is the issue. But generally if in your contract you had mentioned a finished basement then the floor should have been done to that standard and I yr warranty is IMO pretty poor from a builder too. I have dealt with uneven concrete floor in some of our homes it is not a huge deal usually to get it ready for flooring..

Is there a hump in the middle of the floor? That looks like more than 3/8s

what about the cracks?

I’m not sure how to upload more than one photo. But this picture was taken about 3/4 weeks ago and now some cracks hv pieces coming off. There is a radon pipe to the right of the wall. I did my own radon test and the levels came back normal

Get your warranty out and send a certified letter to the warranty company asking for a repair. Cc the builder, certified too. Your warranty should have instructions as to what to do when there is a problem, follow them exactly.

Ok thank you - Im going to reach out to them again. Just wanted feedback cause im doing this alone.

That’s a fairly standard concrete basement floor. Do the self leveling and an uncoupling membrane and it’s good to go.

A 1/16" crack in a basement floor is not a defect, according to the mandatory government warranty programme I used to build under.

As noted above, if you're really concerned, you can always get a structural engineer's opinion for a few hundred dollars.

Not a defect according to the warranty specs but a real Micky mouse job by the builder. I have the same issue with newly built home. Cracks across the basement floor and uneven floor that can be spotted easily.

I also have hot electric wires running not through the joist but conveniently under the joist in some parts of the basement ceiling.

All of these problems are NOT A PROBLEM according to the builder rep.

His reaction was just short of "What do you expect for 1.5 million Dollars... :)