A large deck typically costs $18,000-$55,000 installed, with an average near $34,000 for a 500- to 700-square-foot project. Size, decking material, stairs, railings, foundation requirements, and local labor rates drive the final price.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Large pressure-treated wood deck | $18,000 | $29,000 | $45,000 | About 500-700 sq ft, installed |
| Large composite deck | $25,000 | $42,000 | $65,000 | Standard composite boards and railings |
| Elevated or premium deck | $40,000 | $62,000 | $90,000+ | Complex framing, premium materials, or extensive stairs |
Installed prices for 500- to 700-square-foot decks
For a straightforward ground-level deck, pressure-treated lumber commonly runs $30-$55 per square foot installed. Cedar or redwood often costs $40-$70 per square foot, while composite decking typically falls around $45-$85 per square foot. These rates usually include framing, deck boards, and standard labor, but may exclude demolition, permits, and major site work.
A 600-square-foot deck may cost about $24,000-$42,000 in pressure-treated wood or $36,000-$60,000 in composite. A simple rectangular layout near grade tends toward the lower end; elevated construction, extensive railing, or difficult access pushes the estimate higher. Assumptions: U.S. mid-market labor rates, standard-quality materials, normal access, and no major structural repairs.
How framing, labor, and railings shape the quote
Contractors may price the work as one installed project or separate the major tasks. Comparing line items helps identify whether a low bid leaves out removal, stairs, or code-required guards.
| Quote component | Typical range | What changes the price |
|---|---|---|
| Framing and footings | $8-$18 per sq ft | Height, soil, beam spans, and footing depth |
| Deck boards | $5-$25 per sq ft | Pressure-treated wood, hardwood, or composite grade |
| Installation labor | $10-$25 per sq ft | Layout, access, stairs, and crew productivity |
| Railings | $40-$160 per linear ft | Wood, metal, cable, or glass systems |
| Stairs and landings | $1,000-$6,000 | Number of steps, width, and landing design |
| Demolition and disposal | $3-$10 per sq ft | Old deck size, disposal fees, and access |
Railings and stairs can add several thousand dollars even when the deck’s footprint stays the same. Labor estimates often reflect roughly 80-180 crew hours for a large, uncomplicated build, with more time needed for elevated or custom designs.
Deck height, board grade, and footing depth change estimates
Footprint is only one part of the estimate. A deck under 30 inches high may need less railing and simpler access than one several feet above grade. At roughly 4 feet or higher, stairs, guardrails, bracing, and deeper or more numerous footings can raise the total substantially.
Material dimensions and layout matter, too. A 400-square-foot deck at $50 per square foot is about $20,000 before extras; a 700-square-foot deck at the same rate is $35,000. Composite boards with hidden fasteners and matching fascia generally cost more than basic grooved or pressure-treated boards. Get the contractor to list deck area, board grade, railing length, and footing assumptions in writing.
Wood versus composite for a large outdoor platform
Pressure-treated lumber usually has the lowest initial price, while composite costs more upfront but needs less routine staining or sealing. Cedar and redwood sit between basic treated lumber and many composite systems, although availability and local pricing can change that comparison.
| Material choice | Installed rate | Typical 600-sq-ft price | Budget trade-off |
|---|---|---|---|
| Pressure-treated wood | $30-$55 per sq ft | $18,000-$33,000 | Lower upfront cost; periodic cleaning and sealing |
| Cedar or redwood | $40-$70 per sq ft | $24,000-$42,000 | Natural appearance; upkeep and regional availability vary |
| Composite | $45-$85 per sq ft | $27,000-$51,000 | Higher initial price; less staining and sealing |
Choose based on installed cost and expected upkeep, not board price alone. Premium composite lines, metal railings, and concealed fasteners can increase a quote beyond these typical ranges.
Why large-deck labor rates differ by region
Labor and material delivery often make metropolitan projects more expensive than similar builds in rural markets. As a broad planning adjustment, high-cost coastal or major-city markets may run 10%-25% above a national mid-market estimate. Lower-cost rural areas may be 5%-15% below it, although limited contractor availability can erase that discount.
Local code, season, and access also affect bids. Spring and early summer can bring longer scheduling waits, while a steep yard or narrow path may require extra labor or equipment. Use regional percentages as a first estimate, then compare local written quotes for the same scope.
Permits, old-deck removal, and site work to budget
Permit and inspection fees often total $100-$1,000, but vary by city and project value. Replacing an existing deck may add $1,500-$7,000 for demolition and disposal. Sloped ground, tree-root conflicts, drainage changes, or unstable soil can add another $1,000-$10,000 or more when the design needs extra excavation, retaining work, or engineered framing.
Electrical outlets, lighting, built-in benches, and privacy screens are usually separate add-ons. Allow about $200-$1,000 for basic deck lighting, $500-$2,500 for built-in seating, and more for electrical work requiring new circuits. Ask whether the quote includes permit fees, disposal, stairs, and all planned accessories.
How to lower the price without shrinking the deck
A simple rectangle uses framing and decking more efficiently than multiple angles, curves, or separate levels. Keeping the deck close to grade can reduce stair, railing, and foundation expenses. Standard board colors and widths generally cost less than premium collections, while limiting built-ins and decorative borders preserves the usable area without paying for upgrades.
Compare at least three itemized quotes based on the same dimensions, material grade, railing length, and stair design. Scheduling outside the busiest building months may improve contractor availability, though savings depend on local weather and workload. Preserve money for sound framing and code-compliant footings before choosing cosmetic upgrades.