Deck Calculator
Estimate the cost of building a new deck in 2026. Composite mid-grade decks run about $50 per sqft installed on the 2024 averages — before regional adjustment, and assuming standard footings, framing, decking, railing, and one set of stairs.
Enter the deck surface area, choose a material tier, and pick your region. The math: 2024 national $/sqft median × material multiplier × regional multiplier + 15% contingency.
Planning estimate
$17,250
Mid-scope total for a 300 sqft deck build in the East North Central region at standard finish, including a 15% contingency.
Pressure-treated pine at the low end, composite (Trex / TimberTech) mid-range, PVC or tropical hardwood (Ipe) plus integrated lighting at the top. $/sqft is of deck surface, includes footings, framing, decking, railing, and one set of stairs.
Standard finish: Mid-tier finishes, some layout tweaks, name-brand fixtures and appliances.
Sources: Remodeling Magazine — 2024 Cost vs. Value Report, HomeAdvisor True Cost Guide. Figures are 2024 national medians; re-validate against a local GC before committing to a scope.
Six questions homeowners ask most often, answered in 30–50 words each. Numbers source the same 2024 Cost vs. Value averages the calculator above uses.
Pressure-treated pine runs about $30 per sqft installed, mid-grade composite (Trex, TimberTech) is $50 per sqft, and premium PVC or hardwood with integrated lighting is $80 per sqft. Apply your regional multiplier (0.88× to 1.22×) on top.
A 16×16 deck is 256 sqft. At $50/sqft mid-grade composite that is $12,800 base, $14,720 with a 15% contingency. Pressure-treated drops it to about $7,700 base; premium PVC pushes past $20,500 base before regional adjustment.
Composite costs 60–100% more upfront but eliminates annual staining and lasts 25–30 years vs. 12–15 for pressure-treated. Over a 25-year horizon composite is cheaper total cost of ownership, especially if you would otherwise pay for staining. Skip composite if you plan to sell within five years.
Most jurisdictions require a permit for any deck over 30 inches off grade or attached to the house. Free-standing low decks under 200 sqft sometimes do not require permits. Permit fees run $200–$800; expect a footing inspection, framing inspection, and final inspection.
Per Remodeling Magazine's 2024 Cost vs. Value Report, a wood deck recovers about 50% of cost at resale on the national average; a composite deck recovers around 39%. Decks return more in markets where outdoor living is a year-round feature (Pacific, South Atlantic) and less where they are seasonal.
A standard 250–400 sqft deck takes one to two weeks of construction once permits are pulled — footings and post setting in the first two days, framing in days three to five, decking and railing in the back half. Add multi-level designs, built-in benches, or pergolas and the schedule extends to three or four weeks.
The calculator multiplies a 2024 national mid-point of $50 per square foot by your material-tier multiplier and regional multiplier, then layers a 15% contingency on top. Per-sqft is the right unit for decks because the dominant costs (decking material, framing, railing) all scale with deck surface, while fixed costs (footings, ledger, one staircase) get spread across the platform.
A 256-sqft deck (16×16) at standard composite finish is $12,800 base, $14,720 with the 15% contingency baked in. A 400-sqft deck at the same finish is $20,000 base, $23,000 all-in. Drop to pressure-treated (0.75×) and the same 400 sqft is $15,000 base, $17,250 all-in. Push to premium PVC with integrated lighting (1.65×) in a Pacific market (1.22×) and that same 400 sqft hits roughly $40,300 base, $46,300 with contingency.
The mid-point assumes a complete deck build: site survey and layout, concrete footings to local frost depth, ledger flashing and lag-bolted attachment to the house (or freestanding posts), pressure-treated framing with joist hangers, decking material, code-compliant railing on all open sides, one set of stairs to grade, hidden fasteners on composite or PVC platforms, and standard stain or sealer on wood decks. Permit fees included.
Excluded by default: hardscape work (paver patios, retaining walls), pergolas or roof structures, built-in benches or planters, integrated lighting (other than at upscale tier), hot tubs and the structural reinforcement they require, multi-level platforms, and demolition of an existing deck. Add-ons run $1,500–$15,000 each on top of the calculator's number.
Basic / Pressure-Treated ($30/sqft, 0.75× of mid): pressure-treated pine framing and decking, basic pressure-treated railing, exposed fasteners, stained on completion. Lasts 12–15 years with annual maintenance. Typical 256-sqft deck: $7,700 base.
Standard / Composite ($50/sqft, 1.0×): pressure-treated framing with mid-grade composite decking (Trex Enhance, TimberTech AZEK Pro), aluminum or composite railing, hidden fasteners, low-voltage stair lighting often included. Lasts 25–30 years with no staining required. Typical 300-sqft deck: $15,000 base.
Upscale / Premium ($82.5/sqft, 1.65×): premium PVC decking (TimberTech AZEK Vintage, Wolf Serenity) or tropical hardwood (Ipe), premium railing systems with cable or glass infill, integrated step and post-cap lighting, often built-in benches and planters. Typical 400-sqft upscale deck: $33,000 base nationally; in a Pacific or New England market it pushes past $40,000 base, $46,000+ with contingency.
Same deck, very different invoice. Renomath uses the Cost vs. Value regional roll-ups normalised to the U.S. national average = 1.00. East South Central (TN, KY, AL, MS) lands at 0.88×. Pacific (CA, OR, WA) lands at 1.22×. New England (MA, CT, RI) at 1.18×. A $15,000 standard-composite 300-sqft deck in Nashville becomes an $18,300 project in Seattle. Composite decking ships at similar nationwide prices; framing labor, footings, and permits don't.
Five surprises blow deck budgets more than anything else. Footing depth requirements in colder climates (frost lines below 36 inches) double concrete and excavation costs. Ledger flashing failures on the original house siding force expanded scope into wall repair. Multi-level platforms add roughly 25% to the per-sqft cost because of additional framing, stairs, and railing. Stair complexity beyond a single straight run (turning stairs, multiple staircases to grade) adds $1,500–$5,000 per additional run. HOA or historic-district board reviews can force material substitutions that wipe out the cost savings of pressure-treated.
Most of these issues surface during permit review or after the framing crew shows up. A 15% contingency is the floor; for multi-level decks or attachment to a stucco or brick wall, budget 18–20%. Get a structural review of the ledger attachment before quoting — that single detail is the most common deck-failure mode and the most expensive one to fix later.
The calculator output is a planning range, not a quote. Use it to compare two contractor bids for sanity, to ballpark a HELOC draw, or to decide whether composite makes sense over pressure-treated given your ownership horizon. For a binding number, you need three written bids on a defined scope.
Sibling calculator
$130–$400/sqft for new footprint. Build out instead of out — see what an addition costs vs. a deck.
Sibling calculator
$35–$110/sqft. Finish existing space at less than half the per-sqft cost of a new deck or addition.
See all home improvement calculators → or go back to the master calculator.
Estimates only. Actual costs may vary based on site conditions, permits, market labor rates, and material price changes. Consult a qualified contractor before committing to a scope.