Composite Deck Cost in Northern Virginia
Compare budget scenarios for your deck, understand what a price includes, and prepare a written installation estimate with Loudoun Decks.
Planning a composite deck in Northern Virginia? Start with a measured scope and a written estimate.
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How much should you budget for a composite deck?
These figures come from Loudoun Decks' recent written quotes in Northern Virginia (September–October 2026). They are quoted prices, not guarantees. The written estimate after a site visit is the only project price. A new open deck was about $61–$102 per sq ft in our recent quotes, most around $64–$68 per sq ft. Examples: 192 sq ft at $11,684 (about $11,700); 240 sq ft at $16,000 and 304 sq ft at $20,758 (about $16,000–$21,000); 528 sq ft at $35,615 and 627 sq ft at $40,000–$42,869 (about $35,600–$42,900). A 16×12 with two landings and 13 steps was quoted at $19,654. A 264 sq ft TimberTech Terrain deck with bronze railings was quoted at $23,932 (about $91 per sq ft). Stairs and landings, premium composite (for example TimberTech Terrain), and metal railings push toward the top of that range. External benchmarks: For a simple, low-height composite deck with standard railing and without complex stairs or elevation, external 2026 benchmarks put installed cost at $35–$80 per square foot (RemodelCalculators, reviewed October 11, 2026; Angi lists $30–$60 per square foot for deck construction, updated September 24, 2026). That is about $11,200–$25,600 for a 16×20 (320 sq ft) and $14,000–$32,000 for a 20×20 (400 sq ft). These are national planning estimates, not Loudoun Decks prices or quotes. A written estimate after a site visit is the only project price.
Last reviewed: October 31, 2026. Quoted prices are from Loudoun Decks' recent written quotes. External benchmarks are labeled below.
Composite deck budget calculator
Choose a size, material, and optional features. The planner records that scope. It does not calculate a dollar total, measure the property, or establish a supplier price.
Configure Your Deck
Scope for a written estimate
Floor area and material
400 sq ft · Trex Transcend
Selected options
Stairs (per flight), Composite Railings
This planner does not calculate a price. Demolition, framing, stairs, railings, permits, and site access are confirmed in a written estimate.
About this estimate
Loudoun Decks 2026 quoted prices: A new open deck was about $61–$102 per sq ft in our recent quotes, most around $64–$68 per sq ft. Those are quoted prices, not a total for the selections above. The selections describe scope only. A written estimate prices demolition, structure, materials, stairs, railings, permits, and the measured site.
Loudoun Decks 2026 quoted prices
These figures come from Loudoun Decks' recent written quotes in Northern Virginia (September–October 2026). They are quoted prices, not guarantees. The written estimate after a site visit is the only project price.
A new open deck was about $61–$102 per sq ft in our recent quotes, most around $64–$68 per sq ft. Examples: 192 sq ft at $11,684 (about $11,700); 240 sq ft at $16,000 and 304 sq ft at $20,758 (about $16,000–$21,000); 528 sq ft at $35,615 and 627 sq ft at $40,000–$42,869 (about $35,600–$42,900). A 16×12 with two landings and 13 steps was quoted at $19,654. A 264 sq ft TimberTech Terrain deck with bronze railings was quoted at $23,932 (about $91 per sq ft). Stairs and landings, premium composite (for example TimberTech Terrain), and metal railings push toward the top of that range.
External benchmarks for a composite deck
Trex Enhance at $35–$60 per sq ft and Trex Transcend at $45–$80 per sq ft are external benchmarks from RemodelCalculators, reviewed October 11, 2026. They are in the assumptions for the new composite deck row below. They are not Loudoun Decks quoted prices. The Loudoun Decks quoted range is in the section above.
Planning ranges based on external benchmarks published October 2026 (sources linked beside each figure), not Loudoun Decks prices or quotes. Ranges assume the area, whether the structure is new or existing, the material tier, railing, stairs, demolition, and whether permits are included or excluded, as noted in each row. Elevated, multi-level, custom railing or lighting, site access, permit and HOA conditions, and structural repairs can move a project above these ranges. Your written estimate — after a site visit and measurements — is the only project price.
| Scenario | Assumptions | Published rate and source | 16×20 (320 sq ft) | 20×20 (400 sq ft) |
|---|---|---|---|---|
| New composite deck | Simple rectangle, low height, standard perimeter railing included. Complex stairs, elevation, and site adjustments excluded. Permits excluded. Demolition excluded. RemodelCalculators places Trex Enhance at $35–$60 per sq ft and Transcend at $45–$80 per sq ft inside this installed range. | $35–$80 per sq ft installed (2026) Corroborated by Angi, Cost to Build a Deck (updated September 24, 2026): $30–$60 per sq ft for deck construction across materials, including standard materials and labor and excluding demolition. Source. | $11,200–$25,600 | $14,000–$32,000 |
| Composite resurfacing | New composite boards on an existing structure that has been confirmed sound. No new structure. Stairs, railings, and repairs outside that assumption are extra. | $15–$45 per sq ft (2026) | $4,800–$14,400 | $6,000–$18,000 |
| Old-deck demolition | Separate line when an old deck is removed. Not included in the new-composite or resurfacing rows. | $5–$15 per sq ft (2026) The same $5–$15 per sq ft demolition line appears in Angi, Cost to Build a Deck (updated September 24, 2026). Angi also gives one 360 sq ft replacement example of $7,200–$16,900 (demolition $1,800–$5,400, materials $1,800–$6,500, and labor $3,600–$5,000). Source. | $1,600–$4,800 | $2,000–$6,000 |
| Permit fees | Excluded from the installation rows above. Loudoun County requires a building permit and a zoning permit for every deck. The Typical Deck fee applies under 1,000 sq ft, outside incorporated towns, and cannot be used for a roofed deck, screened porch, hot tub, gazebo, or detached deck. With plan specifications the county lists $395, or $230 in an incorporated town. Decks of 1,000 sq ft or more use a different fee. Fairfax County calculates the fee in PLUS. There is no flat Fairfax total. HOA fees are not published by either county. | Loudoun Typical Deck: $265 (2026). Incorporated town: $100. Fairfax minimum base fee: $141.75, plus levy and surcharge (2026). Fairfax County requires a permit for decks and screen porches. The minimum base fee is in the 2026 fee schedule. Appendix Q was adopted May 5, 2026. Source. | Not included in the ranges above | Not included in the ranges above |
Size totals are the published per-square-foot bounds times 320 or 400 square feet. They are not an average and not a Loudoun Decks quote.
Size-specific guides
Composite deck cost by size: calculator scenarios
Floor area alone does not set the price. The same square footage can be a new deck or a resurfacing, and it can include or exclude demolition, new framing, stairs, and railings.
| Floor area | Base scope to confirm | Also confirm when stairs or railings are added |
|---|---|---|
| 200 sq ft | New structure or resurfacing, decking collection, footings, and demolition | Stair flights, railing length, and whether those items are in the same proposal |
| 300 sq ft | New structure or resurfacing, decking collection, footings, and demolition | Stair flights, railing length, and whether those items are in the same proposal |
| 400 sq ft | New structure or resurfacing, decking collection, footings, and demolition | Stair flights, railing length, and whether those items are in the same proposal |
| 500 sq ft | New structure or resurfacing, decking collection, footings, and demolition | Stair flights, railing length, and whether those items are in the same proposal |
Actual railing length, stair height, structural work, demolition, permit fees, electrical work and access are not measured by this table. Ask for them to be included or excluded explicitly in your proposal.
What should a written composite deck quote include?
Compare quotes against the same scope: footprint, structure, board collection, railing length, stairs, demolition and approvals. Ask each contractor to identify quantities, allowances and exclusions. A lower total may reflect less work. Resolve missing items and the treatment of hidden damage before comparing payment terms or choosing a contractor.
| Scope item | Get this in writing |
|---|---|
| Decking | Brand, collection, color, board profile, layout, border and fastener system. |
| Existing deck | Demolition and disposal; which structural members are retained or replaced. |
| Structure | Footings, posts, beams, joists, ledger and flashing work; inspection or design dependencies. |
| Stairs and railings | Number of flights and landings, stair width, railing length and specified system. |
| Finishes and electrical | Fascia, skirting, lighting, outlets and any separately priced electrical work. |
| Approvals | Responsibility for drawings, HOA submission, county permits, fees and inspections. |
| Contract terms | Allowances, exclusions, quote expiry, payment schedule, change orders and written warranty terms. |
Choose the relevant scope: full replacement, resurfacing, structural repair, or a covered deck. A screened porch adds a different enclosure and roof scope.
Trex vs TimberTech vs AZEK: compare the exact collection
TimberTech includes both composite and Advanced PVC decking, also known as AZEK. Compare the actual collection and board profile with your Trex or Fiberon option. There is no universal brand price premium: the railing, structure, fasteners, availability and finish scope affect the installed total.
Use the material comparison guide for product-specific sources, samples and warranty questions. A warranty duration does not establish how long your entire deck will last.
A manufacturer's material calculator also has different inclusions from an installation quote. Trex's material calculator states that labor is calculated separately.
How should you handle material price changes?
Ask for the proposal's expiration date, named product availability, substitution policy and treatment of later price changes. A tariff headline alone does not establish the price of your selected decking or railing. Current supplier pricing and the signed contract determine which costs are included and who carries changes after approval.
What drives the price of a composite deck?
Deck size is only the starting point. Compare framing and footings, height above grade, stairs and landings, railing length, board collection, trim, demolition, access and electrical work. Two decks with the same floor area can require very different work. Ask each contractor to price the same design and list exclusions.
Is composite decking more expensive than wood?
Composite can have a higher upfront material cost than pressure-treated wood. Its maintenance requirements differ: capped composite generally avoids routine staining and sealing, but still needs cleaning. Compare the installed scope and the care instructions for the exact board. Maintenance savings depend on your exposure, cleaning choices and ownership period.
Which composite brand is best for budget planning?
Compare specific board collections rather than brand names alone. Trex offers multiple composite collections; TimberTech offers composite and Advanced PVC decking, also known as AZEK. Ask for the same framing, stairs, railings and finish details in each option so the price difference shows the material choice rather than a change in scope.
Do permits affect composite deck cost?
Permit-related costs depend on the jurisdiction and work proposed. Drawings, structural design, permit fees and inspection coordination may be separate line items. HOA approval and county approval are separate processes. Confirm requirements with the county for your address, then identify who prepares, submits and pays for each item in the estimate.
Check the official Loudoun County deck guidance or Fairfax County permit requirements for the property's jurisdiction.
How long does a composite deck project take?
Separate the construction period from the full project schedule. Design decisions, HOA review, permit review, materials, inspections and weather can each affect the start or completion date. Request a schedule showing those dependencies. A contractor should confirm a construction window after the scope and required approvals are clear.
Financing your composite deck
Financing options may be available for eligible projects, subject to approval and provider terms. Establish the written project scope first. Review the amount financed, APR, term, fees and total repayment before choosing a payment option.
Composite deck cost questions
How much does a 20x20 composite deck cost in Northern Virginia?
A 20x20 deck is 400 square feet. These figures come from Loudoun Decks' recent written quotes in Northern Virginia (September–October 2026). They are quoted prices, not guarantees. The written estimate after a site visit is the only project price. A new open deck was about $61–$102 per sq ft in our recent quotes, most around $64–$68 per sq ft. Examples: 192 sq ft at $11,684 (about $11,700); 240 sq ft at $16,000 and 304 sq ft at $20,758 (about $16,000–$21,000); 528 sq ft at $35,615 and 627 sq ft at $40,000–$42,869 (about $35,600–$42,900). A 16×12 with two landings and 13 steps was quoted at $19,654. A 264 sq ft TimberTech Terrain deck with bronze railings was quoted at $23,932 (about $91 per sq ft). Stairs and landings, premium composite (for example TimberTech Terrain), and metal railings push toward the top of that range. This quote set does not include a 400 sq ft deck. Nearby recent quotes were 304 sq ft at $20,758 and 528 sq ft at $35,615. External benchmarks for a simple, low-height composite deck with standard railing and without complex stairs are about $14,000–$32,000, or $35–$80 per square foot (RemodelCalculators, reviewed October 11, 2026). Permits, demolition, elevation, and complex stairs are excluded from that external range. Those external figures are not Loudoun Decks prices. Loudoun Decks 2026 quoted prices: A new open deck was about $61–$102 per sq ft in our recent quotes, most around $64–$68 per sq ft. Those figures are quoted prices, not a fixed project price. Demolition, structure, stairs, railings, permits, and site conditions change the total. Request a written estimate for the project.
Does the calculator include railings and stairs?
The calculator records the options you select. It does not calculate a dollar total. The planning table’s new-composite row includes a standard perimeter railing and excludes complex stairs, elevation, demolition, and permits. Railing length, stair height, and local permit fees still have to be itemized in a written estimate.
Is a manufacturer material estimate the same as an installed quote?
No. A material estimate covers its listed products and assumptions. The Trex material calculator explicitly separates labor. An installed proposal should also identify demolition, structure, labor, stairs, railings, permits and cleanup as applicable. Compare the included quantities and exclusions before comparing the totals.
Can the existing frame reduce the cost?
Reusing a suitable frame can reduce the work compared with rebuilding it, but eligibility depends on an inspection and the proposed design. New decking does not correct deteriorated framing, inadequate connections or unsuitable joist spacing. Ask for separate resurfacing and replacement scopes when both remain feasible after evaluation.
Can you pressure wash composite decking?
Follow the care guide for the exact product and generation. Trex and TimberTech publish different limits and cleaning procedures; one pressure setting is not a universal rule. Check the approved cleaner, nozzle, distance and technique before starting. Use the manufacturer care links below rather than treating warranty length as a cleaning instruction.
Does composite decking guarantee a return at resale?
No. Resale recovery depends on the property, condition, market and buyer preferences. A manufacturer warranty is also not a guarantee of resale value or the service life of the entire structure. Choose a documented scope you can afford and evaluate maintenance and daily use alongside potential resale appeal.
Product care sources: Trex care and cleaning and TimberTech care and cleaning. References checked September 13, 2026.
Plan your Northern Virginia project
Loudoun Decks works with homeowners in Ashburn, Leesburg, Sterling, Fairfax, Reston, McLean and surrounding Northern Virginia communities. Include your ZIP code, approximate deck size, photos you can take safely, and whether you want a new deck, replacement or resurfacing when you request an estimate. Confirm scheduling and service availability for your address with the team.
Continue with resurfacing vs replacement, railings, stairs and lighting, or stair planning.
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