Last updated: March 2026
About the Deck Building Cost Calculator
Planning a new deck? The biggest question is always how much will it cost? This free calculator gives you a detailed, line-by-line estimate based on your specific deck size, material choice, features, and location. Compare 6 decking materials, add railing by the linear foot, include stairs, built-ins, and lighting — then see a 20-year cost of ownership comparison to make the smartest long-term investment.
The calculator adjusts for all 50 US states, reflecting real differences in labor rates and material costs. A deck in Connecticut costs 20% more than the same deck in Alabama. Knowing this upfront helps you set a realistic budget before talking to contractors.
Frequently Asked Questions
How much does a 12x16 deck cost?
A 12x16 (192 sq ft) deck costs roughly $4,800-9,600 for materials and labor with pressure-treated wood, or $7,700-16,300 with composite. These are national averages — your state's regional multiplier can adjust costs up or down by 10-35%. Use the calculator above for a detailed breakdown.
Is it cheaper to build a deck or a patio?
A concrete patio typically costs $6-15/sq ft installed, making it cheaper than most deck options. However, decks add more resale value (65-75% ROI vs 50-60% for patios), work better on uneven terrain, and can be built at any height. A ground-level deck on a flat lot is comparable in cost to a stamped concrete patio.
What is the best size for a deck?
For a dining area with 4-6 chairs, plan at least 12x12 (144 sq ft). For dining plus a lounge area, 12x16 or 16x20 is ideal. A good rule of thumb: your deck should be at least the same size as your largest indoor room that opens to it.
Can I build a deck myself to save money?
Yes — DIY saves $15-35/sq ft in labor costs, which is 40-60% of the total project. Deck framing is one of the more accessible carpentry projects. You'll need basic tools (circular saw, drill, level, post hole digger) and a helper. The substructure and ledger board attachment are the most critical steps — get those wrong and the deck can fail.