Composite Decking vs Pressure-Treated Wood: Which Saves More Money Over 20 Years?

It is the question nearly every Atlanta homeowner asks before building a deck: should I pay more for composite, or save upfront with pressure-treated wood? The sticker price tells only part of the story. When you add up maintenance, replacement, and resale value across 20 years, the real winner may surprise you. Here is the full breakdown.

The 20-Year Cost Comparison at a Glance

The numbers below assume a typical 400-square-foot deck in Metro Atlanta. Actual costs vary with design, height, and material grade, but the relationship between the two options holds true.

Even though composite costs roughly 50 to 70 percent more to build, it typically ends up several thousand dollars cheaper over 20 years once you account for the relentless maintenance a wood deck demands in Atlanta's climate.

1. Initial Cost

Pressure-treated pine is the most affordable decking material, running about $25 to $40 per square foot installed in Metro Atlanta. Composite decking from brands like Trex, TimberTech, and Fiberon runs $40 to $65 per square foot installed. For the upfront budget, wood wins clearly, and for homeowners planning to move within a few years, that lower entry cost can make sense.

2. Maintenance

This is where the tables turn. Pressure-treated wood must be cleaned, stained, and sealed every two to three years to fight Atlanta's humidity, mildew, and UV damage. At $2 to $5 per square foot each cycle, that is $800 to $2,000 every few years, adding up to $4,800 to $9,000 over two decades. Composite decking needs nothing more than an occasional wash with soap and water. Over 20 years, the maintenance gap alone often exceeds the higher upfront price of composite.

3. Lifespan

A well-maintained pressure-treated deck lasts about 15 to 20 years in Georgia before boards begin to warp, crack, and rot, and many homeowners face a partial or full rebuild within that window. Quality composite decking is engineered to last 25 to 30 years or more without structural degradation. Across a 20-year horizon, there is a real chance you pay to rebuild a wood deck once, while a composite deck is still going strong.

4. Warranty

Pressure-treated lumber typically carries a limited warranty against rot and termites, but nothing covering appearance, fading, or the labor to maintain it. Premium composite lines come with 25 to 50-year limited warranties, and many include fade-and-stain coverage. That long warranty is not just peace of mind; it protects the resale value of your investment and signals durability to future buyers.

5. Resale Value

Both materials add value, but composite's low-maintenance appeal resonates strongly with today's buyers. A clean, modern composite deck with a transferable warranty is a selling feature, while a weathered wood deck that obviously needs staining can read as deferred maintenance and drag down offers. Decks in general remain one of the highest-ROI outdoor projects, often returning 60 to 75 percent of their cost at resale, and composite tends to hold its looks, and that ROI, longer.

So Which Should You Choose?

Choose pressure-treated wood if your upfront budget is tight, you enjoy (or do not mind paying for) regular upkeep, or you plan to sell within a few years. Choose composite if you plan to stay in your home long-term, want to eliminate ongoing maintenance, and care about the lowest total cost of ownership over 20 years. For most Atlanta homeowners who intend to keep their home and actually use their deck, composite is the money-saver in the long run.

Want a deeper look at brands, colors, and performance in Atlanta's heat? Read our Trex vs. TimberTech vs. Fiberon comparison, or see whether your current deck is worth keeping in our 7 signs it's time to replace your deck guide.