Is this brand new deck actually built right or should I be worried?

The first thing you want to check is the ledger board where the deck meets the house. Look for Z-flashing tucked under the siding and over the top of that board. If you see wood against wood with no metal or vinyl barrier, water is going to rot your rim joist and you will have a massive structural headache in five years. You also want to see 1/2-inch **lag bolts** or structural screws every 12 to 16 inches, not just nails. Nails pull out over time; bolts do not.

Check the posts and footings next. If they used 6x6 posts instead of 4x4s, that is a huge green flag. It usally means they did not cut corners on the budget. Look at how the posts connect to the concrete. They should be sitting in metal brackets that keep the wood an inch or two off the concrete. If the wood is buried directly in the dirt or gravel, it is going to rot out regardless of how brand new it looks right now.

Take a look at the joist hangers too. Every single joist should have a metal bracket holding it to the ledger and the beam. And every single hole in those brackets needs a connector nail or screw in it. You woud be surprised how many DIYers just put two nails in and call it a day. If the joists are spaced 12 inches apart instead of the standard 16, you are looking at a build that is sturdy enough for a **hot tub**, wich is basically the gold standard for being overbuilt.

If the stairs feel solid, look at the stringers underneath. There should be at least three or four of them depending on the width, and they should be resting on a solid landing like a concrete pad, not just sitting on the gravel. If everthing looks beefy and the hardware is consistent, you are likely looking at one of the better-built decks on the market.

That tip about the metal brackets keeping the wood off the concrete is something I never woud have thougth to check. Since you're planning on putting furniture underneath, definitly check the spacing between the deck boards. If they're spaced wide, rain or spills will just pour right down on your lounge area. Do you know if they installed any kind of drainage system under there? I've seen some setups that channel water away so the patio stays dry, but I'm not sure if that's standard or a total pain to add after the fact.

Make sure you grab the railing and give it a solid shake. If there’s any wobble, they likely skipped the internal blocking or tension ties where the railing posts meet the frame. It’s a common DIY fail that makes the whole thing feel cheap and unsafe.

Also, crawl under there and look at the main beam. It needs to be sitting directly on top of the posts, not just bolted to the side of them. You want the wood carrying the weight, not just a couple of carriage bolts. If the beam is notched into the post or sitting on a cap, you’re in good shape.

Check if the sellers actualy pulled a permit for it. Since it looks so new, you can usally call the local building department and see if it passed a final inspection. If they did it without a permit, you might be on the hook for fixing stuff later that doesn't meet the local code.

Also, take a peek at the screws on the top boards. If they're buried too deep, they create little divots that hold water and rot the planks from the inside out. They shoud be flush with the surface.

Check the hardware labels if you can still see them. Look for "G185" or "ZMAX" stamps on those metal hangers. Standard galvanized hardware can actualy corrode and fail fast because the chemicals in modern pressure-treated lumber are pretty aggressive toward certain metals.

Also, look up between the deck boards from below. If you see black joist tape on top of the wood, that’s a huge sign of quality. It stops water from sitting in the screw holes and rotting the frame from the top down. If they took the time to tape the joists, they likely cared about the longevity and didn't cut corners elsewhere.