Estimates are for planning purposes only and based on 2025 contractor data.
Always get at least 3 quotes before hiring. Prices vary by ZIP code, site conditions, and contractor availability.
20×24 deck costs between $9,600 and $31,200 for most homeowners in 2026, depending on material choice and location. At 480 square feet, it rivals the size of many indoor living rooms and gives you space for a fully equipped outdoor living area.
Frequently Asked Questions
How much does a 20×24 deck cost in 2026?
A 20×24 deck costs between $9,600 and $16,800 for pressure-treated wood. Composite decking runs $16,800 to $31,200. The exact cost depends on your state, contractor, and site conditions.
Who should build a 20×24 deck?
A 20×24 deck is best for homeowners with large backyards who frequently host gatherings. At 480 square feet, it is large enough to accommodate outdoor kitchens, fire pits, pergolas, and ample seating all at once.
How much does it cost to add stairs to a 20×24 deck?
Deck stairs typically add $800 to $2,000 to the total project cost depending on the number of steps, material, and whether a landing pad is included.
How long does it take to build a 20×24 deck?
Most crews take 8 to 14 days to complete a 20×24 deck. Complex custom features and elevated builds will require additional time.
More Deck Size Calculators
Deck Cost by State
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