Floating & Ground-Level Deck Guide (2026)
A floating deck skips the ledger and sits low to the ground — simpler, cheaper, often permit-free. Here's how to do it right, including the frost rule people get wrong.
A floating (or ground-level) deck isn't attached to the house — it rests on its own piers, sits low to grade, and avoids the single hardest part of deck building: the ledger connection and its lateral-load anchors. That makes it the most DIY-friendly deck there is, and in many jurisdictions a low, freestanding deck under a size/height threshold needs no permit at all. But 'floating' does not always mean 'no footings' — in cold climates the frost rule still applies. This guide covers pier choices, when frost-depth footings are required, framing without a ledger, and what it costs in 2026.
What counts as a floating / ground-level deck
- Not attached to the house — no ledger board bolted to the rim joist.
- Low to grade — typically under ~30" of deck height, so often no guard rail is required.
- Supported on its own piers or blocks instead of frost-depth footings + posts in many warm-climate cases.
Pier options — block vs sonotube vs cap
How you support the frame is the biggest cost and code decision. Three common approaches, 2026 pricing:
| Pier type | Approx cost each | Frost-depth? | Best for |
|---|---|---|---|
| Concrete deck block (Dek-Block) | $8–$12 | No (warm climates) | Easiest DIY, no excavation |
| Pre-cast pier cap w/ post anchor | $45–$65 | Shallow pad | Compromise — more stable than blocks |
| Buried sonotube + concrete | $95–$175 | Yes — below frost line | Cold climates / code-required |
Deck blocks set on level, compacted gravel are the fastest path — no digging, no concrete pour. They're ideal in warm climates and for small platforms. Buried sonotube piers are the standard wherever the ground freezes.
The frost rule everyone gets wrong
The most common floating-deck mistake is assuming 'floating' means you can skip frost-depth footings. In cold climates, many jurisdictions still require footings below the frost line (IRC R403.1.4) even on a freestanding deck — because frost heave will lift deck blocks and rack the frame over a winter.
- Warm / no-freeze climates (much of the South & West): deck blocks on compacted gravel are usually fine.
- Cold climates (Northeast, Midwest, Mountain): plan on buried sonotube piers below your local frost depth — check the number for your state.
- Always confirm with your local building department before you choose blocks over buried piers.
Do you need a permit?
Many jurisdictions exempt small, low, freestanding decks from permitting — but the thresholds vary and you must verify locally. Common exemption patterns:
- Under 200 sq ft of deck area, AND
- Not more than ~30" above grade at any point, AND
- Not attached to the house, AND
- Not serving a required exit door.
Cross any one of those thresholds (bigger, higher, attached, or at a doorway) and a permit is typically required. The exemption is a convenience, not a license to skip code — the structure still has to be built to standard even when no permit is pulled.
Framing without a ledger
A freestanding deck carries all its load on beams and piers — there's no house to lean on. Two framing patterns:
- Two-beam design: a beam near each end (front and back), each on a row of piers, with joists spanning between them. Each beam carries half the load.
- Beam + cantilever: one or two beams with joists cantilevering past for a clean edge — keep cantilever to 1/4 of back-span (R507.6.1).
Add diagonal bracing between posts/piers (or rely on close pier spacing on a very low deck) to resist racking. The lower the deck, the less leverage wind and footsteps have to sway it.
Surface material on a low deck
Low decks sit close to damp ground, so moisture resistance matters more than on an elevated deck. 2026 surface pricing per linear foot:
| Surface | Price / lf | Life | Note |
|---|---|---|---|
| PT pine 5/4×6 | $1.95 | ~15 yr | Cheapest; annual stain |
| Cedar 5/4×6 | $3.40 | ~25 yr | Use stainless screws |
| Composite mid-tier | $3.80 | 25-yr warranty | Best value low to the ground |
Frequently asked questions
Does a floating deck need footings?
It depends on climate. In warm, no-freeze regions, concrete deck blocks on compacted gravel are usually acceptable. In cold climates, most jurisdictions still require footings below the frost line (IRC R403.1.4) even on a freestanding deck, because frost heave lifts deck blocks and racks the frame. Always confirm with your local building department.
Do I need a permit for a floating deck?
Often not, if it's small and low. A common exemption is under 200 sq ft, no more than ~30 inches above grade, not attached to the house, and not serving a required exit door. Exceed any of those and a permit is usually required. Thresholds vary by jurisdiction, so verify locally — and build to code regardless of whether a permit is pulled.
What's the difference between a floating deck and a ground-level deck?
They overlap. 'Floating' means freestanding — not attached to the house, resting on its own piers. 'Ground-level' means low to grade (usually under ~30 inches), which typically means no guard rail is required. Most ground-level decks are also floating, and the terms are used interchangeably for low, freestanding platforms.
How much does a floating deck cost in 2026?
Far less than an attached deck because there's no ledger, often no permit, and frequently no frost-depth footings. Surface material runs about $1.95/lf for PT pine, $3.40 for cedar, and $3.80 for mid-tier composite, plus $8–$175 per pier depending on type. A small 10×12 block-supported PT deck can land well under a comparable elevated deck. Use DeckMath's floating-deck calculator for your size.
Do floating decks need lateral-load anchors?
No — lateral-load anchors (like the Simpson DTT2Z) attach the deck to the house, and a floating deck isn't attached. That removes one of the most common inspection-failure points. Instead, a floating deck resists side-to-side racking through diagonal bracing between posts or through close pier spacing on very low decks.
Can I use deck blocks instead of buried concrete piers?
Yes in warm climates and for small platforms — deck blocks on level, compacted gravel are the easiest DIY support. In freeze climates, deck blocks can be lifted by frost heave, so buried sonotube piers below the frost line are the durable (and often code-required) choice. The colder your winters, the more reason to go below the frost line.
How low can a ground-level deck be?
As low as a few inches if you frame it with shallow joists and the ground drains well. Keep the framing off direct soil contact, leave airflow underneath to prevent rot, and use ground-contact-rated PT lumber for any member close to grade. Composite surfacing is the smart choice on very low decks because re-staining wood underneath is nearly impossible once it's built.
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