How to Build a Backyard Deck

6 steps 56h 0min Advanced From $114.54

A 12x12 deck DIY is $1500-3000 in materials vs $12,000+ installed. Permit + footings + framing + decking + railing. A 3-weekend project for first-timers.

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Step-by-Step Instructions

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Step 1: Get a permit (mandatory)

Most municipalities require permits for decks over 30" tall. Plans + property survey + inspection. ~$100-300 fee.

Warning: Building without permit means problems at home sale, insurance issues if deck causes injury, and tear-down orders from the town.

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Apply at city planning office

Stamped drawings, site plan. Inspection at footings + final.

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Step 2: Pick decking material

Pressure-treated pine: cheap, refinishing required. Cedar: nicer, needs more care. Composite (Trex): expensive but zero maintenance.

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Trex Enhance composite

25-year warranty, no painting. ~$4-6 per linear ft.

$5
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Pressure-treated pine 2x6

Cheapest. Needs sealing every 2-3 years. ~$1.50-2 per linear ft.

$2
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Cedar 2x6

Naturally rot-resistant. Mid-tier. ~$3-5 per linear ft.

$4
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Step 3: Dig footings + pour concrete

Holes below frost line (3-4 ft in cold climates). Sonotube + concrete + post anchor. Foundation of everything.

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Sonotubes + Quikrete

Sized to your local frost depth. ~$10/bag of Quikrete, $5/tube.

$80
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Rent a post-hole digger

Manual cheap, powered easier. ~$30-60/day rental.

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Step 4: Build frame (16" on center)

Ledger board to house. Joists 16" apart. Beams on posts at footings. This is the structural skeleton.

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Pressure-treated 2x10 joists

Standard for residential deck. Span tables vary.

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Joist hangers (Simpson Strong-Tie)

Galvanized steel hangers. ~$2-3 each.

$2.5 View Details
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Step 5: Install decking boards

Composite: hidden fasteners. Wood: top-screw with deck screws. Maintain consistent gap (1/8") between boards.

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Deck screws (3")

Specifically deck-rated, weather-resistant. ~$60 per box of 1500.

$0.04/use $60 for 1500 View Details
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Camo hidden fastener system

Drives screws at angle from edge. No top-side screws visible. ~$70.

$70 one-time View Details
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Step 6: Add railing (required if over 30")

Decks over 30" off ground need railing per code. Match decking material.

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Trex composite railing system

Matches Trex decking. ~$30 per linear ft.

$30
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Wood railing (cheapest)

Match decking. Spindles + top/bottom rail.

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