Average Deck Cost by Material
| Material | Cost/sqft | 300 sqft | 500 sqft | Lifespan |
|---|---|---|---|---|
| Pressure-Treated Wood | $18–$35 | $5,400–$10,500 | $9,000–$17,500 | 10–15 yrs |
| Cedar | $25–$45 | $7,500–$13,500 | $12,500–$22,500 | 15–20 yrs |
| Trex Enhance | $30–$50 | $9,000–$15,000 | $15,000–$25,000 | 25+ yrs |
| Trex Transcend | $45–$65 | $13,500–$19,500 | $22,500–$32,500 | 25+ yrs |
| TimberTech AZEK | $50–$75 | $15,000–$22,500 | $25,000–$37,500 | 30–50 yrs |
What Drives the Price Up (and Down)
Deck Size and Shape
A simple rectangular deck is the most cost-effective. Multi-level designs, curves, and octagonal sections add 20–40% to the base price due to extra framing, cuts, and waste material.
Material Choice
The single biggest cost factor. Pressure-treated wood is cheapest upfront but needs $300–$800/year in staining and maintenance. Trex composite costs more initially but requires zero maintenance for 25+ years.
Railings, Stairs, and Lighting
Standard aluminum railings add $3,000–$6,000. Trex Signature or cable rail systems run $6,000–$12,000. Integrated LED stair and post lighting adds $1,500–$4,000.
Permits and HOA Fees
Building permits in Loudoun, Fairfax, and Prince William counties cost $200–$800. HOA architectural review is free but can add 2–4 weeks. Read our HOA guide.
Northern Virginia Premium
Deck construction in the NoVA/DC metro area costs 25–35% more than the rest of Virginia due to higher labor rates, stricter codes, longer permit timelines, and HOA requirements.
Real Project Costs from Our Recent Builds
$22,000 — 320 sqft Trex Transcend, Ashburn
Single-level deck replacing a 12-year-old pressure-treated original. Trex Transcend in Island Mist, aluminum railings, 4 stairs to grade. Permitted through Loudoun County in 12 business days. Built in 2.5 weeks.
$38,000 — 480 sqft Multi-Level, Leesburg
Two-level composite deck with Trex Signature railings, integrated LED stair lights, built-in bench on upper level. HOA-approved in one submission. 3-week build.
$52,000 — 600 sqft Deck + Screened Porch, McLean
Open composite deck (400 sqft) connected to a screened porch (200 sqft) with ceiling fan, can lights, and EZE-Breeze windows. TimberTech AZEK in Dark Hickory. 4.5-week build.
How to Get an Accurate Quote
Why online calculators miss 30–40%: They don't account for lot conditions, local permits, HOA requirements, or structural attachment work.
What a good estimate includes: Itemized materials list, labor breakdown, permits, dumpster, cleanup, timeline with milestones, and warranty terms in writing.
Red flags: No permit costs listed, “materials TBD,” no written warranty, cash-only payment, no VA contractor license number.
Frequently Asked Questions
How much does a composite deck cost in Northern Virginia?
A composite deck costs $30-$75 per square foot installed. For a typical 300-500 sq ft deck, expect $15,000-$45,000 depending on material brand, railings, stairs, and complexity.
Is a composite deck worth the extra cost over wood?
Yes. Over 15 years, the total cost of ownership for composite is lower than wood when you factor in annual staining, sealing, and board replacement.
Why are decks more expensive in Northern Virginia?
Higher labor rates, stricter building codes, HOA requirements, and proximity to Washington DC drive costs 25-35% above the Virginia average.
Can I build a deck for under $15,000?
Yes — a small pressure-treated wood deck (150-200 sqft) with basic railings can come in under $15,000.
Does a deck increase home value?
Yes. A composite deck recoups 60-80% at resale. In McLean, Great Falls, and Vienna, a quality deck can add $15,000-$40,000 to your home's value.