A floating deck sits directly on the ground without footings that extend below the frost line, making it one of the most accessible outdoor building projects for DIYers. Because it is freestanding and not attached to the house, most municipalities exempt floating deck ideas from the permit process as long as the deck stays under 200 square feet and 30 inches above grade. That means you can build a stylish outdoor living space in a weekend without paperwork or inspections.
Part of our Decks & Outdoor guide — explore the full guide →
What Makes a Deck “Floating”?
A floating deck, also called a ground-level or freestanding deck, rests on concrete deck blocks or precast pier blocks placed directly on leveled ground. There are no deep concrete footings, no ledger board bolted to the house, and no post-to-beam connections. The deck’s weight and ground contact keep it in place. This design is structurally simpler, significantly cheaper, and in most areas does not require a building permit.
Materials You Will Need
- Deck blocks: Precast concrete pier blocks ($5-$8 each). Plan for one block every 4-6 feet along each joist run.
- Joists: Pressure-treated 2×6 or 2×8 lumber spaced 16 inches on center. 2×8 is recommended for spans over 6 feet between blocks.
- Decking boards: Pressure-treated pine ($1.50-$3 per linear foot), composite ($3-$8 per linear foot), or cedar ($3-$5 per linear foot).
- Landscape fabric: Lay under the entire deck footprint to suppress weed growth.
- Gravel: 2-4 inches of crushed stone under each block for drainage and leveling.
- Hardware: Joist hangers, structural screws, and decking screws.
Step-by-Step Build Guide
- Layout: Mark the deck perimeter with stakes and string. Check for square by measuring diagonals; they should be equal.
- Ground prep: Remove sod within the perimeter. Lay landscape fabric and spread 2 inches of crushed gravel over the entire area.
- Place deck blocks: Position blocks at each corner and every 4-6 feet along joist lines. Level each block individually using a 4-foot level and add or remove gravel beneath as needed.
- Install rim joists: Set the outer frame (rim joists and header joists) on the blocks. Check level in both directions and shim blocks if necessary.
- Install interior joists: Hang interior joists 16 inches on center using joist hangers. Crown each joist upward so any bow works in your favor.
- Lay decking: Start at one edge and work across, leaving 1/8-inch gaps between boards for drainage and expansion. Use two screws per joist connection.
- Trim and finish: Cut overhanging board ends flush with the rim joist using a circular saw guided by a chalk line for a straight edge.
Floating Deck Design Ideas
Simple Square Platform
An 8×8-foot or 10×10-foot square platform is the easiest first build. It holds a small table and four chairs or two lounge chairs comfortably. Material cost for a 10×10 deck using pressure-treated lumber runs $300-$500.
L-Shaped Wraparound
Build two rectangular sections at a 90-degree angle to create an L-shape that wraps a corner of your yard or garden. This design defines separate zones for dining and lounging without building one massive platform.
Multi-Level Stepping Design
Stack two floating decks at slightly different heights (4-6 inches apart) for visual interest. Use the lower level for seating and the upper level for a fire pit or planter display. Keep each section under 200 square feet to stay within permit-free thresholds.
Cost Breakdown
Floating deck ideas are among the most affordable outdoor projects. Here is what a typical 10×12-foot deck costs in materials.
- Deck blocks (12): $60-$96
- Pressure-treated joists: $80-$120
- Pressure-treated decking boards: $180-$360
- Hardware and screws: $40-$60
- Gravel and landscape fabric: $30-$50
- Total: $390-$686
Upgrading to composite decking adds $200-$500 to the total but eliminates annual staining and extends the deck’s lifespan to 25+ years.
Maintenance and Longevity
Pressure-treated wood decks need annual cleaning with a deck wash product and restaining or sealing every 2-3 years. Composite decking requires only soap-and-water cleaning twice a year. Check deck blocks annually for settling and re-level as needed by adding gravel beneath sunken blocks.
Ground-level decks face more moisture exposure than elevated decks, so airflow beneath the surface matters. Maintain at least 2-4 inches of clearance between the ground and the bottom of the joists. Trim any vegetation that grows against the deck edges to promote air circulation and reduce rot risk.
Drainage and Grading Around the Deck
Proper drainage is the single most important factor in a floating deck’s longevity. Before placing deck blocks, confirm that the ground slopes away from any adjacent structure at a minimum grade of 1/4 inch per foot. If the site is flat or slopes toward the house, regrade the soil or install a French drain along the uphill edge to redirect water. Standing water beneath a ground-level deck accelerates rot in pressure-treated joists and creates a breeding ground for mosquitoes. Adding an extra inch of crushed gravel beyond the deck perimeter channels rainwater away from the frame and keeps the area underneath dry even during heavy storms.
Permits and Code Considerations
Most jurisdictions exempt freestanding decks under 200 square feet and 30 inches above grade from permit requirements, but rules vary by municipality. Check with your local building department before starting. Even permit-exempt decks must comply with setback requirements, which typically mandate a minimum distance of 5-10 feet from property lines. HOA rules may also dictate materials, colors, and placement.
