Railings are the part of a deck that inspectors look at most closely, and the part most often built wrong on older DMV decks. Most counties in Maryland and Virginia, and DC, base their residential rules on the International Residential Code, with local amendments. The numbers below are the common baseline; always confirm with your county or city before building, since local rules and adopted code editions vary.
THE COMMON RULES
| Item | Typical Requirement |
|---|---|
| When a guard (railing) is required | When the deck surface is more than 30 inches above the ground below |
| Minimum guard height | 36 inches, measured from the deck surface |
| Baluster spacing | A 4-inch sphere must not pass through any opening |
| Stair handrail height | 34–38 inches, measured from the stair nosings |
| Stair handrail required | Usually when there are four or more risers |
| Strength | Guard posts and rails must resist a specified outward load |
WHERE OLD DECKS FALL SHORT
- Rails that are too low, often 30–32 inches on decks built decades ago.
- Balusters spaced too far apart, which is a fall risk for small children.
- Posts notched and bolted in ways that can't hold the required load.
- Horizontal rails that kids can climb like a ladder; some jurisdictions restrict these.
- Missing or ungraspable stair handrails.
A wobbly railing is the most urgent deck repair there is. If a post moves when you push on it, keep people off that section until it's fixed.
PERMITS AND HOA
New decks and many deck rebuilds need a building permit, and in HOA communities, design approval too. Replacing deck boards in kind usually doesn't. See our guide to HOA approval, and for repair costs, our deck refinishing and repair cost guide.
RELATED READING
DECK REPAIR & REFINISHING COST GUIDE: DMV (2026)
Board replacement, structural repairs, refinishing — what deck work costs in the DMV and when it makes more sense to replace than repair.
ADDING A ROOF OVER YOUR DECK: COVERED PORCH GUIDE
Gable vs. shed roofs, the structural upgrades almost every deck needs, permits, and what a covered porch costs in the DMV.
HOA APPROVAL FOR HOME PROJECTS: A DMV GUIDE
What needs architectural review, what to submit, how long it takes, and how it differs from a permit.
Planning a project? See our Deck Repair service page for scope, process and recent work.
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