When to consider decking vs. concrete?

When deciding between decking and concrete in Snohomish County, Washington, the biggest factors are drainage, slope, cost, maintenance, and how you plan to use the space. With the area's wet climate, these choices can make a significant difference in long-term durability.

Wood or composite decking

Best for uneven ground and elevated outdoor living

Advantages

• Works well on sloped or uneven terrain.

• Can preserve airflow and drainage beneath the structure.

• Comfortable underfoot and visually warm.

• Can be elevated to match a home's entry or floor level.

Disadvantages

• Wood needs periodic cleaning, sealing, or staining.

• Wet surfaces can become slippery; shaded areas may grow moss.

• Framing and concealed connections can deteriorate if moisture is trapped.

• Usually requires more structural work when elevated.

Concrete patio

Best for low-maintenance, ground-level outdoor space

Advantages

• Long service life when properly designed and installed.

• Minimal routine maintenance compared with wood.

• Ideal for grills, heavy furniture, hot tubs when properly engineered, and storage.

• No deck boards or joists to replace.

Disadvantages

• Requires suitable ground preparation and drainage.

• Can crack, settle, or heave due to soil movement and poor installation.

• Sloping sites may need substantial excavation or retaining walls.

• Can feel hard and cold underfoot, and may be slippery if finished poorly.

When concrete wins

• Relatively flat backyard
• Lowest routine maintenance
• Heavy equipment, storage, or a solid working surface (designed for the loads
• Want a blend of durability and appearance (concrete patio with a smaller deck)

When a deck wins

• Want to match the height of a back door
• Natural appearance and a raised outdoor entertaining area
• Sloped backyard (elevated deck)
• Need space beneath the structure for drainage (elevated, properly designed deck)

Special considerations for Snohomish County

Regardless of which surface you choose:

• Rain and drainage: Grade the site so water drains away from your home and does not pond under the deck or against the foundation.
• Moss and algae: Shaded, damp surfaces need appropriate cleaning and a slip-resistant finish.
• Soil and slope: A concrete slab on poorly compacted soil can settle; a deck on a slope needs properly sized footings and lateral support.
• Permits: An elevated deck may require a building permit. A ground-level concrete patio may not need one, but retaining walls, drainage changes, setbacks, and critical-area restrictions can affect the project.
• Long-term cost: Compare not only installation costs but also cleaning, repairs, resurfacing, and eventual replacement.