# Deck cost in 2026: price per square foot by material and size

> A pro-built deck costs about $30–$60 per sq ft: $4,300–$8,600 for 12x12 and $9,600–$19,200 for 16x20. Wood vs composite, add-on costs, permits, upkeep and ROI.

- URL: https://2search.in/knowledge/articles/oct-26/deck-cost
- Genre: Roofing & exterior
- Country: United States
- Published: 2026-10-27
- Updated: 2026-10-27
- Publisher: 2search (https://2search.in)

> **Quick answer:** A professionally built deck typically costs about **$30–$60 per square foot**, all-in. That's roughly **$4,300–$8,600 for a 12×12 deck** and **$9,600–$19,200 for a 16×20 deck**. **Pressure-treated wood** is cheapest upfront; **composite** costs more but needs far less upkeep and lasts longer. Permits usually add **$225–$500**, and railings, stairs and height add a lot.

> **Key takeaways**
> - **Materials are only part of the cost** — framing, footings, railings and labor make up most of the bill.
> - **Composite** costs roughly **1.5–2×** more than pressure-treated wood but saves on staining for 25+ years.
> - **Elevated and second-storey decks** cost much more than ground-level decks.
> - A **wood deck** recouped about **78%** of its cost at resale in the 2024 Cost vs. Value report.
> - Always **pull a permit** — unpermitted decks can cause problems when selling and with insurance.

A deck adds outdoor living space for less than most room additions. This guide shows realistic 2026 prices by size and material, the add-ons that change the quote, how to compare wood and composite over time, and how to plan the project.



![Deck cost in 2026: price per square foot by material and size Breakdown & Visual Guide](/images/articles/deck-cost/diagram.svg)

## Deck cost by size

At about **$30–$60 per sq ft** installed:

| Deck size | Area | Typical installed cost |
| --- | --- | --- |
| 10×10 | 100 sq ft | $3,000–$6,000 |
| 10×12 | 120 sq ft | $3,600–$7,200 |
| **12×12** | 144 sq ft | **$4,300–$8,600** |
| 12×16 | 192 sq ft | $5,800–$11,500 |
| **16×20** | 320 sq ft | **$9,600–$19,200** |
| 20×20 | 400 sq ft | $12,000–$24,000 |

Lower numbers are for simple, low, rectangular pressure-treated decks; higher for composite, multiple levels, built-in benches or elevated designs.

## Cost by decking material

| Material | Decking boards (materials, per sq ft) | Typical lifespan | Upkeep |
| --- | --- | --- | --- |
| **Pressure-treated pine** | $3–$6 | 15–20 years | Stain or seal every 2–3 years |
| **Cedar** | $8–$15 | 15–25 years | Regular sealing; naturally rot-resistant |
| **Redwood** | $9–$15 | 20–30 years | Regular sealing |
| **Composite** (Trex, TimberTech, Fiberon) | $5–$12+ | 25–50 years | Occasional washing |
| **PVC** (capped polymer) | $8–$15 | 30–50 years | Washing only; lightest and most moisture-proof |
| **Tropical hardwood** (ipe) | $12–$25 | 40+ years | Oil to keep colour (optional) |

The **frame** underneath is usually pressure-treated lumber regardless of the decking. Steel or aluminium framing costs more but resists rot.

## Wood vs composite: cost over 20 years

> **Example: 16×20 deck (320 sq ft)**
> - **Pressure-treated:** built for about **$11,000**. Staining every 2–3 years costs ~$700–$1,000 if hired → roughly **$6,000** over 20 years, plus board replacement. **Total ≈ $17,000+**
> - **Composite:** built for about **$17,000**. Washing once or twice a year ≈ $100 a year → **$2,000**. **Total ≈ $19,000**
>
> Over 20 years the costs are close — composite wins on time, splinters and looks; wood wins on upfront price.

## What adds to the cost

| Feature | Typical added cost |
| --- | --- |
| **Railings** — wood | $20–$60 per linear ft |
| Railings — composite or aluminium | $50–$150 per linear ft |
| Railings — cable or glass | $100–$300+ per linear ft |
| **Stairs** | $1,000–$3,000+ per flight |
| **Elevated / second-storey deck** | +$10–$25 per sq ft or more (posts, bracing, footings) |
| Built-in benches or planters | $500–$2,500 |
| **Pergola** | $3,000–$12,000 |
| Lighting (stair and post lights) | $500–$2,500 |
| Hidden fasteners | $1–$3 per sq ft |
| Removal of old deck | $1,500–$5,000 |
| **Permit** | $225–$500 (varies by city) |
| Site prep / sloped yard | $500–$3,000 |

## Permits and codes

Most cities require a **permit** for decks that are **attached to the house**, **higher than about 30 inches**, or larger than a set size (often 200 sq ft). Codes cover:

- **Footing depth** (below the frost line in cold climates)
- **Ledger attachment** to the house with flashing and proper fasteners — the #1 cause of deck collapses
- **Joist spacing** and size
- **Railings**: usually required if the deck is **30+ inches** above the ground, at least 36" high, with gaps under 4"
- **Stair** rise, run and handrails

An inspector checks the work at set stages. Unpermitted decks can delay a home sale or affect an insurance claim.

## Planning your deck

1. **Decide the use:** dining, lounging, grilling, hot tub (needs extra structure).
2. **Size it right:** a dining table for 6 needs about **12×12 ft**; add 4–6 ft for walking around.
3. **Think about sun and privacy:** orientation, trees, neighbours.
4. **Check setbacks** and HOA rules.
5. **Get 3 quotes** with the same materials and drawings.
6. **Book early:** spring and summer are peak season — fall and winter can be cheaper.

## DIY or hire a pro?

| | **DIY** | **Professional** |
| --- | --- | --- |
| Cost | Materials + tools: roughly 40–60% of a pro price | Full price |
| Time | Several weekends | 1–3 weeks |
| Skills | Framing, footings, ledger flashing, permits | Done for you |
| Best for | Simple, low, freestanding decks | Attached, elevated or multi-level decks |

A **freestanding, ground-level platform deck** is a reasonable DIY project. Attached and elevated decks carry real safety risks if built wrong.

## Maintenance tips

- **Wood:** clean and re-stain every 2–3 years; check for loose boards and protruding nails.
- **Composite:** wash with soap and water; avoid metal shovels for snow.
- **Every year:** check the **ledger**, posts, railings and stairs for movement or rot.
- Keep **leaves and planters** from trapping moisture on boards.

## Frequently asked questions

### How much does a 12×12 deck cost?

About $4,300–$8,600 professionally built, depending on materials and height.

### Is composite decking worth the cost?

If you want low maintenance and long life, usually yes. Over 20 years, total costs are often close to wood once staining is included.

### How long does it take to build a deck?

Usually 1–3 weeks for a professional, after permits are approved.

### Do I need a permit to build a deck?

Usually yes for attached decks or decks over about 30 inches high. Check your local building department.

### Does a deck add value to a home?

Yes. A wood deck recouped about 78% of its cost at resale in the 2024 Cost vs. Value report.

### What's the cheapest way to build a deck?

A simple, low, rectangular pressure-treated deck with basic wood railings — or a DIY freestanding platform.

### How long does a deck last?

Pressure-treated wood decks often last 15–20 years; composite and PVC 25–50 years.

## Sources

- [Inch Calculator — Cost to build a deck](https://inchcalculator.com/cost-to-build-deck)
- [Decks.com — Cost to build a deck calculator](https://authoring.decks.com/calculators/cost-to-build-a-deck/)
- [JLC — Remodeling Cost vs. Value report 2024](https://jlconline.com/cost-vs-value/2024/)
- [American Wood Council — Prescriptive residential deck construction guide (DCA 6)](https://awc.org/publications/dca/dca6/)