How old is the house?

I also wonder how old the house is, because this looks like a DIY remodel. The handyperson knew they were covering with carpet so didn't bother doing more than they had to. The main reasons the stairs look bad is due to the risers not being wide enough to cover the height and because there is no trim along the edges of the steps.

I would pull the carpet off the landing as well. Get a 2' level and check the steps for side to side level and the landing for level in both directions and diagonally in both directions. If level is only a tiny bit off I would not worry. Pull off the risers and treads and discard them. Check the height of the riser for each level; no riser should be more than 3/8" different from the one next to it. A greater variance is a tripping hazard. You will need lumber that is at least wide enough to cover this rise. If this is OK, measure the width of the stairs at each step, because walls are not always straight. Write down the measurements as you go. Make note of how deep the treads are as you will need lumber that provides a 1/2" overhang. Most board lumber is nominally 1"x8", 1x10, etc., but actually is 3/4" x 7 1/2" or 9 1/2" etc. You should use a 2x for the treads which is 1 1/2" thick.

Ideally you have a table saw for rip cups and a circular saw for crosscuts. Some lumber stores might make a rip cut for you. If you need one, ask. Cut new risers to length and attach them to the stringer first, Better to make them fit tight and have to press them into place than to have a gap. Make sure their tops are level with the tops of the stringer rise, because the treads will cover any gap at the bottom. Remember there could be a difference between riser heights. Then cut new tread boards to length making sure they will fit tightly wall to wall and attach them to the stringer, butting them against the bottom of the riser board. Fill any small gaps along the wall with painters caulk. Wipe off dust and dirt, prime, and paint the stairs with a durable paint.

Here is a site with a very basic how-to-build-stairs. If there is a major problem with level or riser height, you should find someone who can build a new foundation for these stairs. My description for repair is very basic.

The house is a new construction and those stairs were done by the builder. I am outside of the warranty period but if it is not to code I might be able to have them address it.

The person/professional you want to work with is called a Finishing Carpenter. They keep 'stair codes' in their heads (all 15+ codes needed to make a stair 'safe') or at least in their trucks.

Believe it or not, this is a VERY expensive undertaking. We've seen stair renovations cost DOUBLE what the flooring was worth. Nope. Not kidding.

Before you do anything else to those stairs, PLEASE get a quote from a Finishing Carpenter. You need to know what you are getting into before you reveal more issues than you can pay for.

A set of stairs can move quickly towards the $10K mark...by the looks of these you might need a new set built. How old is the house??

It’s 2 years old. New construction

In Canada we have 10, 5, 2 warranties. The 10 years is the envelope and 'level of construction' quality. The 5 years is on the materials used in the house (the pretty-pretty stuff you asked for) and 2 years is for the workmanship (ie. the tiles won't pop off the wall for 2 years).

Stairs are 'code' items and you can argue they fall inside the 10 year or 5 year warranty...or some other thing that has to do with KEEPING THEIR LICENSE and passing their next inspection.

You get the idea. If they are out of code you BET this is on the builder! And the guy at city hall that let this pass.

I have a 1,2, and 10 year warranty. I’m technically just inside the 2 year mark. The 10 covers major building defects that impact the home’s structural integrity so I’m going to try to make that case.

Send an email to the company. So lon as you put it in writting BEFORE the 2 years has elapsed you 'stop the clock'. As long as they KNOW it is a problem BEFORE 2 YEARS is up, they have to address it. Even if they dithered for 2 more years, a judge would tell them to fix it...because they were TOLD about it BEFORE the 2 years had passed.

Good luck and GET GOING! Don't let the clock tick down too much more.

Just sent off the email to the warranty dept!

Those are "carpet-built" stairs with simple skirt boards, so they are built differently - you could say "not as good" - as what you would have exposed at the front door. What is exactly the problem? The riser being short is not a code problem, just a bad decision by the builder. If the "wonkiness" is wobbling caused by the stringers not being perfect, that could be solved by better fastening, shims, and adhesive. If it's variation in tread or riser height, that is another situation but there are ranges allowed.

What would everyone suggest to fix this?

That depends on what your end goal is. New carpet? Wood treads? Vinyl? Each calls for a different solution.

Beyond that, an actual defect would need to be defined. Are they loose? Inconsistent heights or depths?

"If they are out of code you BET this is on the builder! And the guy at city hall that let this pass."

You can bet that neither is going to do anything about this.

This is not a beginning level DIY project.

""If they are out of code you BET this is on the builder! And the guy at city hall that let this pass."

"You can bet that neither is going to do anything about this."

Exactly Joe. CO issued, so long.

The wonkiness is the treads are uneven lengths and not flat. I’m not sure if the riser spacing is off as well but they don’t feel even.

I want to remove the carpet and replace or cap the risers/treads.

Treads are uneven in length and width that should say.