Pressure-Treated Wood vs. Composite Decking: Pros, Cons & Costs

If you’re building a deck in Portland, the biggest decision you’ll make is pressure-treated wood vs composite decking.

Pressure-treated wood is cheaper upfront, but composite decking lasts longer and requires almost no maintenance. In Portland’s wet climate, that difference matters more than most homeowners expect.

At OJB Solutions, we’ve built decks across the Portland metro, and this is one of the most common decisions homeowners ask us about.

What Is Pressure-Treated Wood Decking?

Pressure-treated wood is lumber infused with preservatives to resist moisture, rot, and insects.

It’s most commonly used for:

• Budget-focused deck builds

• Rental properties

• Larger decks where cost matters

If your main goal is keeping the upfront cost down, this is usually the starting point.

What Is Composite Decking?

Composite decking is made from a blend of wood fibers and plastic designed to resist moisture and reduce maintenance.

It’s commonly used for:

• Long-term homeowners

• Low-maintenance outdoor spaces

• Higher-end deck builds

In Portland, composite has become much more popular over the last several years.

Deck Cost in Portland: Wood vs Composite (2026)

Material choice is one of the biggest cost drivers in any deck project. If you haven’t already reviewed overall pricing, it helps to understand how this fits into total deck cost in Portland.

Pressure-Treated Wood

• $30 – $60 per sq ft installed

• Lowest upfront cost

Composite Decking

• $50 – $100+ per sq ft installed

• Higher upfront cost

Real Example (12x20 Deck)

• Wood: $9,000 – $15,000

• Composite: $14,000 – $20,000+

Most homeowners focus on this price difference first, but that’s only part of the picture.

What We Actually See on Jobs in Portland

This is where experience matters.

In Portland’s climate:

• Decks stay wet longer

• Moisture sits in the boards

• Maintenance gets skipped

Most wood decks we replace are not that old — they fail early because of:

• Lack of sealing

• Poor drainage

• Normal wear from constant moisture

Composite doesn’t have the same issues, which is why more homeowners are choosing it.

Pros and Cons of Pressure-Treated Wood

Pros

• Lower upfront cost

• Easy to build and repair

• Widely available

Cons

• Requires regular staining and sealing

• Warps, cracks, and splits over time

• Shorter lifespan in wet climates

In Portland, maintenance is not optional. If it’s skipped, the deck will wear out much faster.

Pros and Cons of Composite Decking

Pros

• Very low maintenance

• Resistant to moisture and rot

• Long lifespan (25–30+ years)

• Clean, consistent appearance

Cons

• Higher upfront cost

• Can feel warmer in direct sun

• Less natural look than wood

For homeowners planning to stay in their home, this is often the better long-term option.

Which Material Lasts Longer in Portland?

In real-world conditions:

• Pressure-treated wood: 10–20 years

• Composite decking: 25–30+ years

The key difference is moisture resistance.

In Portland, materials that absorb water tend to break down faster. Composite avoids most of that issue.

Maintenance: The Cost Most People Don’t Plan For

This is where a lot of decisions change.

Wood Deck Maintenance

• Stain or seal every 2–3 years

• Ongoing upkeep

• Occasional board replacement

Composite Deck Maintenance

• Basic cleaning

• No staining or sealing

• Minimal upkeep

Over time, maintenance costs and effort can close the gap between wood and composite.

A Real Example from a Portland-Area Job

We recently quoted a homeowner for a pressure-treated deck.

They initially chose wood to save money.

After walking through:

• Maintenance requirements

• How decks perform in Portland weather

• Long-term cost

They switched to composite.

Their main concern wasn’t price anymore — it was avoiding ongoing maintenance and future repairs.

This is something we see regularly.

Which Decking Material Should You Choose?

Choose Pressure-Treated Wood If:

• You want the lowest upfront cost

• You’re comfortable maintaining it

• It’s a short-term solution

Choose Composite Decking If:

• You want low maintenance

• You’re planning long-term

• You want better durability in Portland weather

For most homeowners we work with, composite ends up being the better long-term value.

How This Fits Into Your Deck Project

Material is just one part of the project.

Things like:

• Deck height

• Structure

• Drainage

• Permits

All impact your total cost and long-term performance.

Frequently Asked Questions

Is composite decking worth it in Portland?

Yes. Because of the moisture, composite tends to last longer and requires less maintenance.

Does pressure-treated wood rot in Oregon?

Over time it can, especially without regular maintenance and proper drainage.

How often do I need to maintain a wood deck?

Every 2–3 years for staining or sealing is recommended.

Can composite decking fail?

It can, but usually due to poor installation rather than the material itself.

Which option adds more value to a home?

Composite typically adds more perceived value because of durability and appearance.

Get the Right Deck Built for Oregon’s Climate

Choosing the right material is important, but installation matters just as much.

At OJB Solutions, we build decks designed to handle Portland’s moisture and weather conditions.

• Same-day estimates

• Clear, upfront pricing

• In-house crews

• Built for long-term performance

Call 503-882-0704 or request your estimate online today.