A pergola looks like a simple thing. Four posts, some beams, a little shade. But the gap between one that becomes the best seat in the yard and one that just sits out there getting ignored is decided almost entirely before anyone picks up a tool, in the choices about scale, placement, and material. That last one gets underestimated constantly. Ask any pergola builder Austin homeowners actually hire, and material comes up in the first conversation, because it drives the price, the upkeep, and how the structure looks in year twelve.
Austin Remodelers & Build, a licensed and insured design-build firm whose work spans kitchen and bathroom remodels, additions, ADUs, and full-home renovations, builds in aluminum for reasons I’ll get into. But wood isn’t wrong. It’s just a different set of tradeoffs, and which set fits depends more on your climate and your tolerance for maintenance than on anything a brochure will tell you.
What Actually Fails on a Pergola
Nobody replaces a pergola because they got bored of it. They replace it because something went wrong structurally, and the failure mode is different depending on what it’s made of.
Wood loses to moisture cycling
Wood outdoors doesn’t just get wet. It gets wet, dries out, gets wet again, and swells and shrinks a little every time. That movement opens checks in the grain, joints loosen, water gets in deeper, and eventually decay fungi find a foothold. The USDA Forest Products Laboratory has spent over a century researching exactly this, and the short version is that moisture management, not the species you pick, does most of the work in determining how long exterior wood lasts.
Cedar and redwood heartwood resist decay well. The sapwood in the same board does not. Pressure treated pine handles rot and insects but tends to twist as it dries. And in a hot climate, UV breaks down the surface faster than anywhere else, which is why a stained pergola in central Texas needs attention every two to three years while the same structure in Oregon might go five.
Aluminum loses at the connections
Aluminum doesn’t rot, doesn’t feed termites, and doesn’t warp. What can go wrong is the hardware and the details. Fasteners that aren’t compatible with aluminum can cause galvanic corrosion where dissimilar metals touch. Powder coating eventually chalks or fades if it’s a low-grade finish. And an attached pergola with a poorly flashed ledger will put water into your wall regardless of what the posts are made of.
That last point is worth repeating because it’s the most common expensive mistake I see with attached structures of any material. The ledger connection is a wall penetration. Treat it like one.
Side by Side
| Factor | Cedar or Redwood | Powder-Coated Aluminum |
|---|---|---|
| Installed cost per sq ft | $30 to $60 | $50 to $100 (louvered systems run higher) |
| Maintenance cycle | Clean and re-seal every 2 to 3 years in hot sun | Wash occasionally, no refinishing |
| Realistic lifespan | 15 to 25 years with upkeep, less without | 30+ years |
| Span between posts | Shorter, more posts needed | Longer spans, fewer posts |
| Surface temperature | Stays cooler to the touch | Heats up in direct sun, especially dark colors |
| Repairability | Individual boards replaceable | Component replacement, usually needs matching stock |
| Look | Warm, natural, ages to gray | Clean lines, slimmer profile, modern |
Those cost ranges shift with design complexity, span, whether it’s attached or freestanding, and what’s happening with material pricing that quarter. Treat them as a starting point, not a quote.
The Twenty Year Picture
Here’s where the comparison gets interesting, and where most people stop calculating too early.
A wood pergola costs less on day one. No argument. But budget for cleaning and re-sealing every couple of years, and either your weekend or somebody’s labor rate goes into that. Call it a few hundred dollars in materials and a full day of work each cycle, or several hundred more if you hire it out. Over twenty years, that’s a meaningful number, and it’s the number people forget when they’re comparing bids.
Aluminum front-loads the cost and then mostly stops asking for anything. Whether that math favors it depends on how long you plan to stay in the house and how you feel about maintenance. Someone selling in four years is better off with wood. Someone in a forever home who already resents power-washing the deck should probably look at aluminum and stop agonizing.
Where Wood Still Makes Sense
I don’t want to talk anyone out of wood. There are real cases for it.
- Traditional and historic homes. A modern aluminum profile on a 1920s bungalow can read as a mismatch, and no amount of good detailing fixes a proportion problem.
- You want climbing plants. Wisteria, grape, star jasmine. Wood takes a wire trellis or eye hook without any thought, and the mature look of a planted pergola is hard to beat.
- Smaller budgets. If the choice is a wood pergola now or an aluminum one in three years, build the wood one and enjoy it.
- You like the patina. Cedar left unsealed weathers to a soft silver gray. Some people love it. If that’s you, your maintenance schedule just got a lot shorter.
- DIY builds. Wood is forgiving of a slightly imperfect cut. Aluminum systems generally are not.
Sizing and Shade Decide If You Use It
Material is only half the decision, and honestly not the half that determines whether you sit out there.
Height matters more than people expect. Too low and the space feels compressed, too high and it stops shading anything useful. There’s a workable range, and our guide to pergola height walks through how to land on the right one for your patio.
Then there’s what goes on top. An open rafter pergola gives you dappled light, which is lovely and also nearly useless at two in the afternoon in July. Rafter spacing, orientation to the sun path, and whether you add a cover all change how many hours the space is genuinely comfortable. We’ve collected the options in our roundup of pergola cover ideas, from retractable canopies to polycarbonate panels.
One caution on solid covers: they turn an open structure into a wind-catching one. If you’re planning to enclose the top, that needs to be in the design from the start, not added later to a frame that was never engineered for uplift. Similar thinking applies to any roofed outdoor structure, which we get into in our piece on pool cabana ideas.
Kits Versus Custom
Prefab kits are cheaper and faster, and for a small freestanding structure on a flat patio, a good one is perfectly reasonable.
Where they break down is anywhere the site isn’t simple. Sloped ground, an existing patio that isn’t square, a roofline the pergola has to relate to, a span wider than the kit’s stock lengths. Kits solve for the average yard, and most yards aren’t average. That’s before you get to proportions, which are fixed in a kit and which are the single biggest thing separating a structure that looks intentional from one that looks bolted on.
If your situation is straightforward, buy the kit. If you find yourself trying to talk yourself into one, that’s usually the answer right there.
Frequently Asked Questions
Is an aluminum pergola better than wood?
Neither is universally better, though they fail differently. Aluminum resists rot, termites, and warping, spans farther with fewer posts, and needs essentially no refinishing. Wood costs less up front, looks warmer, stays cooler to the touch, and suits traditional architecture better. If you want the lowest lifetime maintenance, aluminum wins. If you want natural material character or a lower entry price, wood does.
How much does a pergola cost?
Installed cedar or redwood pergolas commonly run $30 to $60 per square foot, and powder-coated aluminum runs roughly $50 to $100, with louvered or motorized systems going higher. Prefab kits can come in well under those figures for simple freestanding structures. Attached pergolas, sloped sites, long spans, and integrated lighting or fans all push costs up.
Do aluminum pergolas get hot?
The metal itself does heat up in direct sun, particularly in darker powder coat colors, so it is warm to touch on a hot afternoon. That said, it does not radiate meaningful heat down into the space below, and the shade underneath is comfortable. If touch temperature concerns you, lighter finishes stay noticeably cooler.
Do you need a permit to build a pergola?
Often yes, though the rules vary a lot by jurisdiction. Many cities require a permit once a structure passes a certain size, and attached pergolas frequently need one regardless of size because they connect to the house. Setback requirements, easements, and HOA architectural review may also apply. Check with your local building department before you order materials.
How long does a wood pergola last?
With consistent maintenance, a cedar or redwood pergola typically lasts 15 to 25 years. Without it, expect considerably less, especially in hot, sunny climates where UV degrades the surface finish faster. The posts where they meet the ground or concrete are almost always the first thing to go, so how those bases were detailed matters as much as the species of wood.
Wrapping Up
The material question really comes down to an honest answer about maintenance. Not whether you could re-seal a pergola every couple of years, but whether you will. Most people know which one they are, and the ones who overestimate themselves end up with a gray, checked structure they feel vaguely guilty about.
Beyond that, get the proportions right and put it where you’ll actually walk to. A well-sized wood pergola in the right spot beats a beautifully specified aluminum one in the wrong corner of the yard, every time.
