Decking1 min read·Updated March 9, 2026
Deck Addition Cost 2026: Wood, Composite, and PVC Compared
Detailed cost breakdown for deck additions including material comparison, size estimates, and permit considerations.
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Deck Building Costs 2026
- Pressure-treated wood (basic): $15–25/sq ft installed ($7,500–12,500 for 500 sq ft)
- Cedar/redwood: $20–35/sq ft installed
- Composite (mid-grade): $30–50/sq ft installed
- PVC/capped composite (premium): $45–70/sq ft installed
Material Comparison Over 25 Years
Pressure-treated wood: lower upfront cost, but requires staining/sealing every 2–3 years ($300–800/application) and eventual board replacement. A $10,000 PT deck may cost $15,000+ in maintenance over 25 years.
Composite: Higher upfront cost, minimal maintenance (annual cleaning, occasional re-sealing). A $20,000 composite deck may require only $2,000–3,000 in maintenance over 25 years.
25-year total cost can be roughly equivalent — composite wins on convenience; PT wins on repairability and classic appearance.
Add-On Costs
- Railing: $50–200/linear ft (aluminum balusters, cable rail, glass panels)
- Built-in seating/planters: $500–3,000
- Pergola addition: $3,000–10,000
- Lighting: $500–2,500
- Permit: $200–1,500 (required for most deck additions)
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Frequently Asked Questions
How much does a 12x16 deck cost?
A 12×16 (192 sq ft) deck: pressure-treated $3,000–5,000; composite $7,000–12,000. These are rough estimates — site conditions, railing type, and local labor rates significantly affect actual cost. Get 3 bids from local contractors for the most accurate quote.
Do I need a permit to build a deck?
In most jurisdictions, yes — any deck attached to the house or over a certain size (often 200 sq ft) requires a permit. Requirements include structural plans, setback compliance, and inspections. Unpermitted decks can require removal at sale. Always permit deck additions.