Decks are one of the most commonly deficient items found in Long Island home inspections. Many were built without permits, altered over time, or simply not maintained. Here’s what your inspector looks for — and why it matters.
The Most Common Deck Deficiencies
Ledger board connection: the point where the deck attaches to the house is the most structurally critical part — and the most frequently improper. Rot at the ledger can cause catastrophic failure. Missing or improperly spaced lag bolts, no flashing over the ledger, and rot at the rim joist are all serious structural findings.
Posts and Footings
Deck posts must bear on proper footings below the frost line (42 inches in Nassau and Suffolk County). Posts sitting on concrete patio slabs, or directly buried in soil, are code violations and structural risks. Inspectors probe post bases for rot — wood in contact with soil deteriorates, often invisibly from the surface.
Guardrails and Handrails
Decks over 30 inches above grade require guardrails at least 36 inches high with balusters spaced no more than 4 inches apart. Stairs with four or more risers require a graspable handrail. Many older Long Island decks don’t meet current code — these are safety items, not cosmetic ones.
Book your Long Island home inspection — including full deck and exterior evaluation — at homeinspectionsli.com.
