How far apart should deck joists be?

16 inches on center for most pressure-treated decking; 12 inches for composite boards or a diagonal layout.

Do I need a permit for a deck in Knoxville?

Usually yes. Attached decks over a certain height require a permit and inspection. We handle the permit process for decks we build.

Material Calculators

Enter the deck footprint and board width. We size the decking, framing, and fasteners so you can price the lumber run before you start.

Your numbers

Deck length(ft)

Deck width(ft)

Deck board width

Joist spacing

Include railing

Decking needed

437 linear ft

Framing spans, ledger attachment, and footing depth are code items — Knox County decks typically need a permit and inspection.

Quantities are planning estimates. Verify measurements on site and buy a little extra for cuts, waste, and future repairs.

Gallons of paint and primer for a room, based on real wall area.

Sheets, screws, joint compound, and tape for walls and ceilings.

Tile count, thinset, and grout for a floor, shower, or backsplash.

Free Estimates

From small repairs to complete bathroom transformations, Homefficient Renovations is ready to help you improve your home.