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Deck Construction Cost Calculator

Decking boards are the part people choose and the smaller half of the cost.

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The deck

A 16 by 20 ft deck is 320 sq ft.

Location

Labor rates and prices vary enough by state to move an estimate substantially.

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Estimated deck construction cost: $10,200, ranging from $8,600 to $12,900.

Estimated deck construction cost

medium confidence
$10,200Built and finished, before contingency
$8,600 lowhigh $12,900

What makes up the typical figure

  • Pressure-treated framing$2,500
  • Construction labor$1,900
  • Wood railing (56 linear ft)$1,700
  • Pressure-treated pine — decking$1,500
  • Everything else$2,660
  • United States average
  • +15% contingency advised
  • Assumptions 2026.07.1

Why medium: no state was resolved, so national averages were used; the modeled range spans about 42% of the typical value.

Key figures

Cost per square foot
$31.91($26.79 – $40.20)
Footings required
8
Railing length
56 linear ftAbout three quarters of the perimeter — the side against the house needs none.
Estimated labor
26 hours
Cost per year of expected life
$681($572 – $858)Based on a modelled 15-year life, before maintenance. This is how composite closes the gap on pressure-treated.

Cost breakdown

Estimated cost of each component, with low, typical, and high values.
ComponentLowTypicalHigh
Pressure-treated pine — deckingMaterials352 sq ft ordered, including a 10% waste allowance.$920$1,500$2,300
Pressure-treated framingMaterialsJoists, beams, ledger, and hardware. Sized up for height.$1,550$2,500$3,850
Footings (8)MaterialsAbout one per 40 sq ft. Depth is set by your local frost line.$440$880$1,700
Construction laborLabor26 carpenter-hours at $74/hr billed.$1,150$1,900$3,350
Wood railing (56 linear ft)Materials$1,000$1,700$2,700
Stairs (4 steps)MaterialsStringers, treads, and risers at full deck width. Stairs are priced per step because the width rarely changes.$280$520$920
Stain or sealerMaterials$320$610$1,100
DeliveryOther$90$200$420
Permit and inspectionPermitDecks almost always require a permit and at least a footing inspection before pour.$150$450$1,100
Estimated deck construction cost$8,600$10,200$12,900
Recommended contingency (15%)Deck contingency covers what the footings find and what the ledger attaches to. Rotten rim joist behind the siding is common and must be repaired before a ledger can be safely bolted on.$1,300$1,550$1,950
Total to budget$9,900$11,750$14,850

The low and high columns above will not add up to the headline range. Each line has its own uncertainty, and every line landing at its worst case at the same time is unlikely, so the total combines them as partially independent rather than summing the extremes.

What moved your estimate

  • Pressure-treated is the value option — decreases the estimate

    By far the cheapest surface, but it needs cleaning and re-sealing every two to three years and typically lasts 15. Budget for that upkeep, not just the build.

How this number was produced
  1. Decking352 sq ft × $4.2/sq ft$1,478
  2. Framing320 sq ft × $6.5/sq ft × 1.2 height$2,496
  3. Labor hours320 sq ft ÷ 15 sq ft/hr × 1.20 difficulty26 hours
  4. Totaldecking + framing + footings + labor + extras$10,210

Adjustments applied

  • Regional labor — national×1.00

    National 47-2031 Carpenters mean wage of $31.55/hr (BLS OEWS May 2025), times the contractor burden multiplier.

  • Raised (2-6 ft)×1.20

    Height drives framing size, footing depth, and whether the crew can work from the ground.

  • Rectangular×1.00

    Angles and curves mean more cuts, more waste, and more framing.

  • Regional material index×1.00

    National material pricing; no state resolved.

Notes and sources3 notes, 2 sources

Worth knowing

  • Footing depth is set by your local frost line, not by the deck. In cold climates that can mean four feet or more, which changes both cost and schedule.
  • The ledger connection to the house is the most safety-critical detail on a deck and the most common failure point. It must be flashed and bolted, never nailed.
  • Maintenance is not included. Pressure-treated and cedar need cleaning and re-sealing every two to three years; composite and PVC need washing only.

Sources

  • U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), State cross-industry estimatesprimaryMay 2025retrieved 2026-07-31
  • PlainTotal editorial baseline for exterior work, reviewed against publicly advertised supplier pricing, manufacturer specifications, and published trade guidanceassumption2026 national baselineretrieved 2026-07-31

Framing, footings, railings, and stairs usually add up to more than the surface, and height changes all four at once — an elevated deck is a substantially different structure from a ground-level one of the same area.

Methodology

How this calculator works

Why height matters more than area

A ground-level deck is a platform. An elevated one is a structure: the framing has to carry the same load over longer spans, footings go deeper, guardrails become load-bearing safety components, and the crew can no longer work from the ground.

We apply a height multiplier to framing, footings, and labour together rather than to the total, because the decking surface itself costs the same whatever height it sits at.

Footings, railings, and stairs

Footings are counted at roughly one per 40 square feet, increased for elevated decks. Depth is governed by your local frost line, which is why the same deck costs more to build in Minnesota than in Georgia before any wage difference.

Railing is priced along about three quarters of the perimeter, since the side against the house needs none. Stairs are priced per step rather than per foot, because the width rarely changes and the stringer work does not scale with rise.

What is not modelled

Ledger repair. If the rim joist behind the siding is rotten it must be replaced before a ledger can be safely attached, and that is not visible when a quote is written.

Ongoing maintenance. Wood decks need cleaning and re-sealing every two to three years; over a fifteen-year life that is a meaningful share of the original build cost and is the honest counterweight to composite pricing.

Location and data

Where the numbers come from

Location is optional, and we only ask for a ZIP code or a state — never a street address. A ZIP code is matched to its state using published postal prefix ranges, and that state is used to look up labor and price rows in the tables below. If you leave it blank, or your ZIP cannot be matched, the estimate falls back to a national average and says so on the result.

Nothing you enter is transmitted or stored. The calculation runs entirely in your browser, and the only place your inputs appear is in the page URL, so you can bookmark or share a result if you choose to.

  • primaryMay 2025v2025.05

    U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), State cross-industry estimates

    Hourly mean wage (H_MEAN) for each trade. These are employee wages, not billed contractor rates. Billed rates are derived in the engine by applying a documented burden-and-overhead multiplier; see docs/calculator-methodology.md.

  • assumption2026 national baselinev2026.07.1

    PlainTotal editorial baseline for exterior work, reviewed against publicly advertised supplier pricing, manufacturer specifications, and published trade guidance

    These are NOT published statistics. As with the interior material baselines, no public agency publishes exterior material prices at this granularity and proprietary construction cost databases cannot be reproduced. Every figure is material only, delivered to a metropolitan supply yard, before regional adjustment and before sales tax. Labor rates are crew-hours or per-unit production rates for a competent crew in normal conditions. See docs/data-sources.md for the full limitation statement.

Full detail on every dataset is on the data sources page. Spotted something wrong? Report incorrect data.

Calibration

The judgements behind this estimate

These are the figures we chose rather than measured. For each one we record the range of values found across references, what we selected, and why — because an estimate you cannot interrogate is not much better than a guess. The 3 marked high risk are the ones most likely to be wrong and most consequential when they are.

  • Footing cost eachhigh riskmedium confidence
    Observed range
    40 — 400 (typical 110)USD each
    Why this value
    A shallow poured pier in easy soil is under $50; a deep frost-line footing in rock or with an engineered bracket exceeds $400. Selected band covers typical residential footings, scaled by 1.35 when the user reports difficult ground.
    Applies to
    United States. Frost-line depth is strongly regional — cold-climate footings are roughly twice the depth and cost of warm-climate ones.
    Known limits
    Frost line is not derived from location despite the climate dataset being available. This systematically understates cold-climate decks and is the highest-value fix on this calculator.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks; Sampled municipal fee schedules across small, mid-size, and metropolitan jurisdictions
    Last verified
    2026-07-31 · reviewed annual
  • Height above grade multiplierhigh riskmedium confidence
    Observed range
    1 — 1.8 (typical 1.2)multiplier on framing, footings, and labour
    Why this value
    A ground-level deck is a platform; an elevated one is a structure. Deeper footings, larger members over longer spans, load-bearing guardrails, lateral bracing, and staging instead of ground-level work. Applied to framing, footings, and labour but deliberately not to the decking surface, which costs the same at any height.
    Applies to
    United States.
    Known limits
    A single multiplier compresses a genuine step change. Above roughly 8 feet many jurisdictions require engineered drawings, which is a discrete cost the 1.5 factor does not represent.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed annual
  • Decking surface material per square foothigh riskmedium confidence
    Observed range
    2.2 — 30 (typical 8)USD per square foot
    Why this value
    Sampled decking board pricing spans roughly $2.20/sq ft for economy pressure-treated to $30 for tropical hardwood. Selected values are mid-band per material. This is the input people choose and the smaller half of the cost — framing, footings, railing, and stairs together usually exceed it.
    Applies to
    United States. Cedar and pressure-treated pricing are regionally sensitive to mill proximity; not modelled.
    Known limits
    Lumber volatility applies here as it does to fencing. Composite and PVC pricing is far more stable than the wood options, so a single annual review cadence suits them and not the others.
    Sources
    Publicly advertised big-box and trade supplier pricing, sampled across several metropolitan markets
    Last verified
    2026-07-31 · reviewed annual
  • Deck area served per footingmedium confidence
    Observed range
    25 — 60 (typical 40)square feet per footing
    Why this value
    Footing count follows beam and joist span tables rather than area, but area is a reasonable proxy at typical residential spans. One per 40 sq ft matches common 8x8 to 6x6 pier grids. Increased by 30% for elevated decks, where posts carry more load and lateral bracing is required.
    Applies to
    United States.
    Known limits
    A proxy for a span calculation. A long narrow deck needs more footings per square foot than a square one of the same area, and this does not capture that.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks; Derived from first principles; not a market price
    Last verified
    2026-07-31 · reviewed biennial
  • Framing material per square footmedium confidence
    Observed range
    3.2 — 21 (typical 6.5)USD per square foot
    Why this value
    Joists, beams, ledger, hangers, and fasteners. Pressure-treated framing runs $3.20-$10/sq ft depending on span and spacing; steel framing runs $9-$21. Scaled by the height multiplier because longer spans need deeper members.
    Applies to
    United States.
    Known limits
    Does not vary with joist spacing or span, both of which materially change material volume. A 16-inch on-centre deck and a 12-inch one are priced identically.
    Sources
    Publicly advertised big-box and trade supplier pricing, sampled across several metropolitan markets; Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed annual
  • Deck construction production ratemedium confidence
    Observed range
    6 — 21 (typical 13)square feet per hour
    Why this value
    Covers framing and decking together. Pressure-treated on a simple rectangle reaches about 21 sq ft/hr; tropical hardwood, which needs pre-drilling for every fastener, falls to 6. Height and shape multipliers are applied separately.
    Applies to
    United States.
    Known limits
    Hidden-fastener systems, common with composite, are slower than the face-screwing this rate assumes. Railing and stairs are costed separately rather than through this rate.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed biennial
  • Deck permit and inspectionlow confidence
    Observed range
    80 — 2000 (typical 450)USD
    Why this value
    Decks almost always require a permit and at least a footing inspection before pour. Fees range from flat small-jurisdiction charges to percentage-of-value schedules in metropolitan areas. Elevated decks sometimes require engineered drawings, which the top of the band partly reflects.
    Applies to
    United States. Highly local.
    Known limits
    Engineered drawings for elevated or unusual decks can exceed $2,000 on their own and are not separately modelled.
    Sources
    Sampled municipal fee schedules across small, mid-size, and metropolitan jurisdictions
    Last verified
    2026-07-31 · reviewed annual
  • Railing cost per linear footmedium confidence
    Observed range
    16 — 190 (typical 40)USD per linear foot
    Why this value
    Wood railing runs $16-$48/ft; cable and glass systems reach $190. Selected mid-band values per type. Applied to about three quarters of the perimeter, since the side against the house needs none. On a small deck railing is often a third of the budget.
    Applies to
    United States.
    Known limits
    Perimeter is derived from area using a shape factor, so a long narrow deck gets too little railing and a square one roughly the right amount.
    Sources
    Publicly advertised big-box and trade supplier pricing, sampled across several metropolitan markets
    Last verified
    2026-07-31 · reviewed annual
  • Stair cost per stepmedium confidence
    Observed range
    50 — 320 (typical 130)USD per step
    Why this value
    Stringers, treads, risers, and fasteners at full deck width. Priced per step rather than per foot because width rarely changes and stringer layout does not scale with rise. Stairs are the most labour-dense element per square foot of usable space.
    Applies to
    United States.
    Known limits
    A long run usually needs its own footing and a mid-landing, neither of which is modelled. Stairs over about eight steps are therefore understated.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed biennial
  • Built-in feature costlow confidence
    Observed range
    300 — 9000 (typical 900)USD each
    Why this value
    Bench seating $400-$1,800; pergola $1,800-$7,500 depending on span and material; integrated lighting $350-$1,900 depending on fixture count. Selected mid-band values.
    Applies to
    United States.
    Known limits
    Flat costs that do not scale with deck size. A pergola over a 600 sq ft deck costs far more than over a 200 sq ft one, and the model does not capture that.
    Sources
    Publicly advertised big-box and trade supplier pricing, sampled across several metropolitan markets; Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed annual
  • Stain or sealer per square footmedium confidence
    Observed range
    0.7 — 4 (typical 1.9)USD per square foot
    Why this value
    Material and labour for a single coat on a new wood deck. Applied only to wood materials, since composite and PVC need washing rather than finishing.
    Applies to
    United States.
    Known limits
    One-time only. Wood decks need re-sealing every two to three years, which over a fifteen-year life is a meaningful share of the build cost and appears only in the cost-per-year metric.
    Sources
    Publicly advertised big-box and trade supplier pricing, sampled across several metropolitan markets; Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed biennial
  • Existing deck removal per square footmedium confidence
    Observed range
    1.8 — 10 (typical 4.5)USD per square foot
    Why this value
    Demolition and disposal. The high case reflects an elevated deck needing dismantling rather than demolition, and disposal of treated lumber which some facilities surcharge.
    Applies to
    United States. Tipping fees vary by county.
    Known limits
    Assumes footings stay. Removing old concrete piers is a separate and substantial cost that is not modelled.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks
    Last verified
    2026-07-31 · reviewed biennial
  • Deck waste allowance and deliverymedium confidence
    Observed range
    0.05 — 0.18 (typical 0.1)share of material / USD per job
    Why this value
    Decking waste is higher than fencing because boards must be cut to length at both ends of every run and mitred at any angle. 10% suits a rectangle; a curved or multi-level deck runs closer to 18%, which the shape multiplier partly captures through labour but not through material.
    Applies to
    United States.
    Known limits
    Waste does not currently vary with the shape input even though shape is the main driver of it. A complex deck therefore under-orders material.
    Sources
    Published trade production-rate guidance and contractor estimating handbooks; Publicly advertised big-box and trade supplier pricing, sampled across several metropolitan markets
    Last verified
    2026-07-31 · reviewed biennial

Cost factors

What changes the price most

Height above ground
The dominant structural factor. Elevated decks need heavier framing, deeper footings, and staging.
Decking material
A sevenfold spread from pressure-treated pine to tropical hardwood, before labour differences.
Railing
Cable and glass railing can cost four times wood per foot and is often a third of a small deck budget.
Shape
Curves and multiple levels add framing, cuts, and waste. A rectangle is far cheaper per square foot.
Stairs
The most labour-dense element per square foot of usable space.
Ground conditions
Rock or a high water table can force engineered footings, and is the usual cause of a change order.

Questions

Frequently asked

How much does it cost to build a deck?

A 320 square foot pressure-treated deck at moderate height with wood railing and a short stair run commonly lands in the low-to-mid five figures installed. The same deck in composite with cable railing can be twice that. Enter your own details above for a state-adjusted figure.

Is composite decking worth the extra cost?

It costs roughly two to three times pressure-treated up front and never needs staining. Over a 30-year life the cost per year is often comparable once you count re-sealing wood every two or three years. If you plan to move within five years, the up-front premium is unlikely to come back.

Do I need a permit to build a deck?

Almost always in the United States, and usually a footing inspection before the concrete is poured. Decks attached to a house are a life-safety structure and unpermitted work commonly surfaces at resale. The allowance here is a broad national band.

How much does a 12x12 deck cost?

144 square feet at ground level in pressure-treated with a short stair run is usually the cheapest meaningful deck you can build, typically in the four to low five figures. Raising it, adding railing all round, or switching to composite each move it up substantially.

What is the most expensive part of a deck?

Rarely the decking boards. On a typical build, framing plus footings plus labour is well over half the cost, and on an elevated deck the substructure alone can exceed the surface. Railing is the other quiet expense, particularly cable or glass.