8×20 Deck Cost Calculator: 2026 Price Guide

8×20 deck costs between $3,200 and $10,400 for most homeowners in 2026, depending on material and local labor rates. At 160 square feet, it is a long narrow deck ideal for side yards, wraparound areas, or homes where outdoor space runs along one side of the house.

Frequently Asked Questions

How much does an 8×20 deck cost in 2026?

An 8×20 deck costs between $3,200 and $5,600 for pressure-treated wood and $5,600 to $10,400 for composite decking. The 160 square foot size keeps costs reasonable while providing useful long narrow outdoor space.

What is an 8×20 deck best used for?

An 8×20 deck works well as a long side yard deck, a wraparound section, or a narrow rear deck along the back of a house. The 20-foot length creates room for multiple chairs or a small table at one end with lounging space at the other.

How does an 8×20 compare to a 10×16?

Both are 160 square feet but with different proportions. An 8×20 is narrower and longer while a 10×16 is slightly wider and shorter. Choose based on your yard shape and intended use.

How long does it take to build an 8×20 deck?

Most contractors can complete an 8×20 deck in 2 to 4 days. The narrow width keeps framing straightforward though the extra length adds to the decking installation time.