Rectangular deck cost · 2026-Q1 retail

Rectangular Deck Cost

A simple rectangular deck — the baseline build that anchors 75%+ of residential decks in the US. Lowest labor, lowest waste, fastest to permit.

1.00× labor vs rectangular7% waste factorhigh search demand

Estimate your rectangular deck cost

The calculator below is seeded with a 16×20 footprint. Dial in your material, railing, stairs, and footings for a full breakdown, then use the result as your baseline — this shape carries no premium.

Inputs

Dimensions

Plan-view length × width.

Lengthft

Widthft

Area · 320 sq ft·Perimeter · 72 ft

Material tierinstalled $/sqft band

State2-letter · labor multiplier

Footprint shape1.00× complexity

AttachmentShares house structure

Deck heightinches

IRC R312 requires a 36″ guardrail above 30″.

Stairssteps

Site accessDriveway / wide-open backyard

Scope toggles

Project budget · Northeast

$25,247 – $44,358

$79–$139/ sq ft

320 sq ft · Mid composite · 1.22× labor · 1.10× complexity

Materials

Low $7,920

Labor

Low $11,810

Add-ons

Low $5,129

Soft costs

Permit · demo · design

Project advisories · IRC 2021

Guardrail included (deck 36″ off grade)

IRC R312

IRC R312 mandates a 36″ guardrail on open edges when deck height exceeds 30″. 52 lf priced at Mid composite tier.

Building permit included in budget

IRC R105

Northeast typical permit fee is in the budget. Most jurisdictions require a permit for decks > 200 sqft, > 30″ above grade, or attached to the house.

Hidden-fastener install premium baked in

Manufacturer specs

Mid composite uses hidden-fastener clip systems (Cortex / CamoClip / Trex Universal) — labor takes 25–30% longer than face-screwing PT. Already inside the tier's installed $/sqft band.

Cost breakdown

Materials29%$12,672
Labor43%$18,895
Add-ons19%$8,369
Soft costs1%$389
Contingency9%$4,033
Share of the high estimate. Switch tiers below to repaint the split.

Item

Qty

Total

Labor (Northeast, 1.22× national)

$11,810 – $18,895 (low – high estimate)

1.0 scope

$18,895

Labor (Northeast, 1.22× national)

$11,810 – $18,895 (low – high estimate)

1.0 scope

—

$18,895

Materials (decking + framing + hardware)

$7,920 – $12,672 (low – high estimate)

Home Depot Lowe’s

1.0 scope

$12,672

Materials (decking + framing + hardware)

$7,920 – $12,672 (low – high estimate)

Home Depot Lowe’s

1.0 scope

—

$12,672

Railing (52 lf, ledger 3-side)

$3,489 – $6,027 (low – high estimate)

1.0 scope

$6,027

Railing (52 lf, ledger 3-side)

$3,489 – $6,027 (low – high estimate)

1.0 scope

—

$6,027

Contingency (10% reserve)

up to $4,033

1.0 scope

$4,033

Contingency (10% reserve)

up to $4,033

1.0 scope

—

$4,033

Stairs (4 steps @ 9.0″ rise)

$1,640 – $2,342 (low – high estimate)

1.0 scope

$2,342

Stairs (4 steps @ 9.0″ rise)

$1,640 – $2,342 (low – high estimate)

1.0 scope

—

$2,342

Building permit (Northeast)

$389 flat

1.0 scope

$389

Building permit (Northeast)

$389 flat

1.0 scope

—

$389

Materials subtotal

$44,358

National-median pricing (2026-Q1). Local prices vary ±15%. Materials line uses Mid composite tier; switch tiers to repaint the budget. Includes 10% contingency reserve on the high estimate.

Live preview

Visualize your deck

Photoreal 3D · plan view · framing breakdown. Color matches your tier selection.

PBR materialsHDR lightingMid composite

Loading 3D scene…

DeckMath·20′ × 16′·320 sq ft

Trex Enhance·composite

Drag · pinch / scroll

Joists

16 × 16′

Beams

1 × 2-ply 2×10

Posts

4 × 6×6

Boards

35 rows

Project all-in

Materials (low – high)

Mid composite tier · Trex Enhance · Fiberon Good Life · TimberTech Prime+. ~$0.05/sqft/yr.

$7,920 – $12,672

Labor (installed)

Northeast · 1.22× national index

$11,810 – $18,895

Add-ons

Railing · stairs · lighting (only included items)

$5,129 – $8,369

Soft costs

Permit · demo · design (only included items)

$389 – $389

Contingency reserve (10%)

Industry-standard cushion for unforeseen scope

$4,033

Project total (low – high)

Plan around the high. Get 3 contractor bids — DeckMath should land within ±15%.

$25,247 – $44,358

Same dimensions, different tier

tap to switch

DIY savings

$21,392

vs mid-range contractor

Materials only: $12,672
Estimated hours: 480 hr
Skill required: advanced

Finance estimate

$899/month

60-month personal loan @ 7.99% APR

Principal: $44,358
Total interest: $9,595
Estimate only — shop 3+ lenders.

Composite/PVC installs use hidden-fastener clip systems — labor is 25–30% slower than face-screwing pressure-treated wood. That premium is already baked into the tier's installed $/sqft band.

Need exact board counts?

The Deck Material Calculator gives you a permit-ready bill of materials — every joist, hanger, fastener, and footing — validated against IRC 2021 span tables.

Open

Estimates use 2026-Q1 national-median pricing (Home Advisor, Angi, RSMeans). Expect ±15% variance vs your local market. Always get 3 contractor bids before signing. This calculator is not a substitute for a licensed inspector or structural engineer.

Best for

First-time builds, narrow yards, DIY projects, tight budgets, fast-permit jurisdictions.

Watch-outs

Visually plain unless dressed up with railing detail, picture-frame trim, or pattern decking.

How the framing changes

Standard ledger + 2-beam framing. Joists run perpendicular to the longer rim, hangers at 16″ OC. No unusual cuts in the perimeter.

Why the cost premium

A rectangular footprint is the cheapest deck to build per square foot: joists run in one direction at 16″ O.C., the perimeter has no unusual cuts, and material waste sits around 7%. Every dollar of the budget goes into deck area rather than geometry.

Maintenance trade-off

Easiest to clean, fastest to re-stain, fewest awkward corners for debris to collect in.

Rectangular deck cost by size

Mid-tier composite, installed, with the 1.00× rectangular multiplier applied. Pressure-treated runs lower; premium PVC and hardwood run higher — use the calculator above to switch tiers.

Size	Area	Mid composite (installed)
8×10	80 sqft	$4,000–$6,400
10×10	100 sqft	$5,000–$8,000
10×12	120 sqft	$6,000–$9,600
12×12	144 sqft	$7,200–$11,520
12×14	168 sqft	$8,400–$13,440
12×16	192 sqft	$9,600–$15,360
14×16	224 sqft	$11,200–$17,920
12×20	240 sqft	$12,000–$19,200
16×16	256 sqft	$12,800–$20,480
14×20	280 sqft	$14,000–$22,400
12×24	288 sqft	$14,400–$23,040
16×20	320 sqft	$16,000–$25,600
18×20	360 sqft	$18,000–$28,800
16×24	384 sqft	$19,200–$30,720
20×20	400 sqft	$20,000–$32,000
20×24	480 sqft	$24,000–$38,400
24×24	576 sqft	$28,800–$46,080
20×30	600 sqft	$30,000–$48,000
24×30	720 sqft	$36,000–$57,600
30×30	900 sqft	$45,000–$72,000

FAQ — Rectangular deck cost

How much more does an rectangular deck cost than a rectangular one?

A rectangular deck is the baseline — it carries no shape premium (1.00× labor) and the lowest material waste (7%). Every other shape is priced as a multiplier on top of this footprint.

What changes in the framing for an rectangular deck?

Standard ledger + 2-beam framing. Joists run perpendicular to the longer rim, hangers at 16″ OC. No unusual cuts in the perimeter.

Is an rectangular deck worth it?

First-time builds, narrow yards, DIY projects, tight budgets, fast-permit jurisdictions. Watch-outs: Visually plain unless dressed up with railing detail, picture-frame trim, or pattern decking.

How much maintenance does an rectangular deck need?

Easiest to clean, fastest to re-stain, fewest awkward corners for debris to collect in.

Other useful tools

Full deck cost calculator

5 finish tiers, railing, stairs, footings, DIY vs pro.

Deck cost by size

20 common footprints with full material takeoffs.

Permit-ready bill of materials

Joists, hangers, fasteners, footings — IRC validated.

Compare all deck shapes

Labor and waste factors for 8 popular footprints.

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