Most fence jobs go bad before the first post hits the ground. Not because a fence is hard to install — it’s not — but because the homeowner doesn’t know what to ask, and the contractor doesn’t volunteer it. Sometimes that’s habit. Sometimes the contractor is quoting what you want to hear so he wins the bid. Either way, you end up with a fence that looks fine for two summers and then starts leaning like it’s had a few.
Here’s the stuff they leave out.
Wood is not just wood
When someone says “pressure-treated pine,” that phrase covers about six different things. There’s ground-contact rated and above-ground rated. There’s #1 grade and #2 grade. There’s wood that came off the truck still wet from the treatment plant, which is going to twist and check the second the sun hits it.
If your contractor isn’t telling you the rating on the posts versus the pickets, ask. Ground-contact rated posts aren’t optional — they’re code in most places and they’re what stops your fence from rotting at the soil line in four years. Above-ground rated is fine for pickets and rails. Don’t let anyone put above-ground posts in the dirt and tell you it’ll be fine. It won’t.
Cedar’s a different conversation. Western red cedar holds up. Northern white cedar is softer and won’t last as long. Both will gray out if you don’t seal them. If you wanted that warm cedar tone forever, you needed to know that going in.
The post is the whole fence
I don’t care what the pickets look like. The post is the fence. If the post fails, everything else is decoration on a collapsing structure.
Posts need to go below the frost line — in Philly that’s around 36 inches, deeper in some spots. I had a job out in Roxborough where the previous crew sank the posts about 18 inches because it was a hot day in July and they wanted to be home by three. Two winters later the whole back run was tilted like a drunk leaving Pat’s. The homeowner thought it was a wood problem. It wasn’t. It was a depth problem, and we had to pull the whole thing and reset every post.
Concrete matters too. A proper post setting is a bag of concrete in the hole, water added, mixed in place, and crowned at the top so water sheds away from the wood. Not slopped in, not half a bag, not “we’ll just tamp the dirt back in.” If the contractor isn’t crowning the concrete, water pools at the post base and you’re rotting from day one.
For 6-foot privacy fencing, 4x4 posts are the minimum and honestly not what I’d use. 6x6 posts cost more and last longer, especially on gate ends and corners. Worth the upgrade.
Gates fail first. Every time.
Gates are the part of the fence that moves, and movement is what kills wood and hardware. If your contractor is using the same 4x4 post for your gate as he’s using for the run, you’ve got a problem coming. Gate posts should be bigger — 6x6 minimum — and set deeper, sometimes with a wider footing.
The gate itself needs an anti-sag cable or a steel frame. Wood gates without diagonal bracing sag inside a year. Hardware matters too. Cheap zinc hinges rust through in a few seasons. Spend the extra twenty bucks on stainless or heavy-duty galvanized. You’ll thank yourself when the gate still swings clean five winters from now instead of dragging a furrow in your yard.
Vinyl and metal — the gauge game
Vinyl fence is sold by appearance. What you should be asking about is wall thickness. A cheap vinyl panel is hollow with thin walls — kid hits it with a baseball, it cracks. Better vinyl has thicker walls, internal ribs, and aluminum stiffeners in the rails. Ask for the wall thickness in inches or millimeters. If the salesman doesn’t know, that tells you what you need to know.
Aluminum and steel fencing have a gauge rating. Lower gauge = thicker metal = stronger fence. A 16-gauge aluminum panel is a real fence. A 20-gauge panel is decorative. Both will look identical on the showroom floor.
Chain-link is the same story. 9-gauge wire is what you want for anything you actually care about keeping in or out. 11-gauge and 12-gauge exist and they’re fine for a vegetable garden, but don’t use them around a pool or a dog that pulls.
Maintenance — the part nobody mentions on quote day
Every fence needs maintenance. Anybody who tells you different is selling.
- Wood: Stain or seal every 2-3 years. Otherwise it grays, cracks, and starts holding water in places you don’t want.
- Vinyl: Hose it off a couple times a year. Watch for cracks and UV chalking on cheaper grades.
- Aluminum: Almost zero maintenance, but check the powder coating for chips and touch them up before rust sneaks in.
- Chain-link: Galvanized lasts decades if the coating isn’t scratched. Vinyl-coated looks nicer, but the coating eventually fails and rust shows up underneath.
The “lifetime warranty” on a lot of these materials is a marketing number, not a real one. Read the warranty. Most of them cover the material itself, not the installation, not labor to replace, not fading, not damage from weather they decide was “abnormal.” Useful to know before you assume you’re set for thirty years.
What to ask before you sign
Three questions that filter out the lazy bids:
- What grade and rating are the posts versus the pickets?
- How deep are the posts going, and how are you setting them?
- What are you doing different for the gate posts and gate hardware?
If the contractor can answer those three without hedging, you’re probably in good hands. If he gets vague or annoyed, get another bid. The good ones don’t mind being asked — they’re proud of the answer.
A fence isn’t a flashy project, but it’s something you live with every day, and your neighbors see it too. Spend an extra hour up front asking the right questions and you’ll get one that’s still standing straight when the neighbor’s is leaning into your yard.