How many concrete footings does a 20x14 deck require?

A 20x14 deck with beams spaced 10ft typically requires 6 to 8 footings depending on joist overhang and local frost depth requirements.

Guided Multi-Calculator Workflow

Deck Building Material & Cost Estimator

Calculate complete deck framing and decking packages. Enter deck dimensions to calculate deck boards, concrete pier footings, railing balusters, and structural joist lumber.

Step 1: Enter Project Dimensions

Shared across all tools

Length (ft)

Width (ft)

Height (ft)

Step 2: Select Material Finish Grade

Calculators Flowing Into This Project:

✓ Decking CalculatorCascaded

✓ Railing CalculatorCascaded

✓ Footings CalculatorCascaded

✓ Fasteners CalculatorCascaded

Consolidated Bill of Materials

Estimated Total Material Cost (STANDARD)

$3,001 – $6,845

Covers 280 sq ft (26 m²) project footprint

Deck Surface

5/4x6 Deck Boards (16ft)

660 linear ft with 10% waste

42 boards$672 – $1596

Substructure

2x8 Pressure-Treated Joists (16" OC)

Ground-contact treated joists

17 14ft boards$374 – $544

Piers & Footings

Sonotube Concrete Piers

36 bags 60lb concrete & hardware

12 piers$540 – $960

Guardrail

36" Perimeter Railing & Balusters

Code-compliant 4" baluster spacing

64 linear ft$1280 – $3520

Fasteners

Hidden Fasteners / Coated Screws

Corrosion-resistant exterior rated

980 screws$135 – $225

Material estimates only — does not include demolition, permits, contractor labor, or specialty tools. Local building code and freight delivery charges vary.

Deck Building Remodel FAQs

Pressure-treated pine decking materials cost approximately $15 to $25 per square foot, while composite decking (Trex, TimberTech) averages $35 to $60 per square foot with fasteners.