Building a deck is one of the most rewarding DIY projects, but skipping steps leads to failed inspections, structural problems, and costly rework. This checklist covers every phase from planning through final inspection so nothing gets missed.
Phase 1: Planning & Permits
- Check local building codes and setback requirements — most decks over 200 sq ft or 30 inches above grade require a permit
- Call 811 to mark underground utilities before digging
- Draw a site plan showing deck dimensions, distance from property lines, and ledger attachment point
- Submit permit application with structural drawings (most jurisdictions require joist span tables and footing sizes)
- Choose decking material: pressure-treated lumber ($2-4/lf), composite ($4-8/lf), or hardwood ($6-12/lf)
- Calculate material quantities — use our deck board calculator for exact board counts, linear feet, and fasteners
Phase 2: Footings & Posts
- Lay out footing locations using batter boards and string lines — check for square using the 3-4-5 triangle method
- Dig footings below frost line (check local code — typically 36-48 inches in northern states)
- Pour concrete footings with post brackets or set precast pier blocks
- Install 6x6 or 4x4 posts (6x6 preferred for decks over 4 feet high) plumb and brace temporarily
- Wait minimum 24 hours for concrete to cure before loading
Phase 3: Framing
- Attach ledger board to house with 1/2-inch lag bolts or structural screws, 16 inches on center — flash the top with metal Z-flashing
- Install beam(s) on posts — use our beam calculator to verify span and load capacity
- Hang joists with approved joist hangers — typical spacing is 16 inches on center (12 inches for composite decking or diagonal patterns)
- Add blocking between joists at midspan for stability
- Install rim joist and secure with structural screws
- Schedule framing inspection before installing decking
Phase 4: Decking
- Start the first board at the house, leaving 1/4-inch gap from siding for drainage
- Space boards 1/8 inch apart (use a 16d nail as a spacer) — composite boards need manufacturer-specified gaps
- Pre-drill near board ends to prevent splitting
- Use two screws per joist — stainless steel for cedar/redwood, coated deck screws for pressure-treated
- Stagger butt joints randomly across at least three joist bays
- Snap a chalk line and trim the outer edge flush with a circular saw and guide
Phase 5: Stairs
- Measure total rise from deck surface to ground (or landing pad)
- Calculate step count and stringer layout — use our deck stair calculator for exterior-specific sizing
- Cut stringers from 2x12 pressure-treated lumber — minimum three stringers for stairs 36 inches wide
- Pour a concrete landing pad at the base (4 inches thick, 6 inches beyond bottom tread)
- Attach stringers to rim joist with engineered stair brackets
Phase 6: Railings & Finish
- Install railing posts — bolted through rim joist, not just screwed to decking
- Top rail height: 36 inches minimum for residential (42 inches if deck is over 30 inches above grade in some jurisdictions)
- Balusters spaced so a 4-inch sphere cannot pass through — use our baluster calculator for exact quantities
- Add post caps and trim for a finished look
- Apply sealer or stain to pressure-treated lumber after it has dried (typically 2-4 weeks after construction)
- Schedule final inspection
A well-built deck adds usable living space and real resale value. Take the time to get each phase right, pull your permits, and schedule inspections. The code requirements exist to keep the structure safe for decades.