How much does deck building cost in District of Columbia?

A typical deck project in District of Columbia runs $9,800 to $39,000, adjusted for District of Columbia construction costs (well above the national average). Pressure-treated runs about $30–$60 per sq. ft.; composite $50–$95 per sq. ft.

Is your deck building quote in District of Columbia fair?

Compare the quote to the state-adjusted range on this page, make sure every line item in the "what's included" list appears in writing, and get at least two other bids. Home Project Copilot's free scan flags missing scope and vague terms in under a minute.

How much does a 12x24 deck cost in District of Columbia?

Pressure-treated lumber, installed at 12x24 (288 sq. ft.) typically runs $10,500 to $21,100 in District of Columbia. That is a $30–$60 per sq. ft. of deck rate from public cost guides, adjusted for District of Columbia construction costs. Access, demolition, repairs, and permits can add to it.

District of Columbia cost guide

Deck building cost in District of Columbia

In District of Columbia, deck building prices run well above the national average — whether you're in Washington, Georgetown, or Capitol Hill. Here's what a complete, permitted job should cost, and how to tell whether the quote in your hand is fair.

Typical District of Columbia range

$9,800 – $39,000

Pressure-treated runs about $30–$60 per sq. ft.; composite $50–$95 per sq. ft.

Included at this price: Footings, framing, decking, railing, stairs, and permits.

District of Columbia prices by project type

Project	District of Columbia range	Unit check
Pressure-treated wood deck	$8,500 – $26,800	Pressure-treated framing and decking runs about $30–$60 per sq. ft.
Composite or PVC deck	$14,600 – $48,800	Composite decking commonly runs $50–$95 per sq. ft. installed.
Deck repair, resurface, or railing	$1,800 – $14,600	Re-decking over sound framing commonly runs $20–$45 per sq. ft.
Patio or paver installation	$4,900 – $30,500	Paver patios commonly run $15–$40 per sq. ft. installed.

Reviewed 2026. Editorial benchmarks from public cost surveys (Zonda Media / Remodeling magazine, Houzz, Angi / HomeAdvisor), adjusted by a state construction-cost index. Not a bid, appraisal, or licensed estimating data.

What a common size costs in District of Columbia

Pressure-treated lumber, installed: $30–$60 per sq. ft. of deck, adjusted for District of Columbia construction costs.

Size	District of Columbia estimate
12x12 (144 sq. ft.)	$5,300 – $10,500
12x24 (288 sq. ft.)	$10,500 – $21,100
16x20 (320 sq. ft.)	$11,700 – $23,400
20x20 (400 sq. ft.)	$14,600 – $29,300

Per-unit rate from the public cost guides cited above, multiplied by size and the District of Columbia construction-cost index. Access, demolition, repairs, and permits can add to it — this is a benchmark, not a bid.

Red flags in District of Columbia deck building quotes

Footing depth, diameter, and frost-line compliance
Ledger attachment method and flashing
Joist size and spacing versus the decking material's requirement
Hardware: hangers, fasteners, and corrosion rating
Railing height, baluster spacing, and stair details

Commonly missing line items: ledger flashing, frost-depth footings, structural screws versus lag bolts, stair stringer spacing, grading and site restoration.

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