What Does a New Deck Cost in Alpharetta, GA in 2026?

Ask three Alpharetta contractors to quote the same backyard and you'll usually get three different numbers — sometimes thousands of dollars apart. That gap isn't a sign someone's overcharging; it almost always comes down to what's included in the number and what isn't. Once you understand the line items behind a deck estimate, you can read any quote for what it actually says instead of just reacting to the total at the bottom.

What's Actually Inside a Deck Quote

Every deck estimate in the Alpharetta area breaks into four categories: decking material, framing and footings, labor, and permits or engineering. Pressure-treated decking material typically runs $4 to $9 per square foot, while composite boards — the kind we compare in detail in our composite vs. wood breakdown — run closer to $7 to $15 per square foot before installation. Framing and footings, the part that disappears under the finished deck, frequently account for a third of the total cost or more, especially on an elevated design.

Labor for a licensed local crew generally lands between $12 and $18 per square foot for a straightforward, single-level build. That number climbs with stairs, multiple levels, or a lot that makes it hard to get materials to the build site.

Rough Ranges by Deck Size

These are planning numbers for a simple, single-level deck in the Alpharetta area — not a quote, since your lot, elevation, and design change the math considerably.

• Around 200 sq ft: roughly $9,000–$14,000 in pressure-treated wood, or $14,000–$20,000 in composite.
• Around 300 sq ft: roughly $13,500–$21,000 in wood, or $21,000–$30,000 in composite.
• 400+ sq ft: roughly $18,000–$30,000 or more in wood, or $28,000–$42,000 or more in composite.

The wood-to-composite gap widens as square footage grows — that's straightforward per-square-foot math, not composite getting relatively worse at scale. Factor in resealing and repairs over 15 years and the comparison often shifts back the other way, which we walk through fully in the composite vs. wood post.

What Pushes a Number Up Beyond Size

Elevation, Footings, and Alpharetta's Red Clay

A deck sitting a step off a patio slab needs far less structure than one perched several feet above a sloped North Fulton backyard, which calls for deeper footings, taller posts, and usually a full staircase. North Georgia's dense red clay soil also plays a role here — it holds water differently than sandy or loamy soil, which affects how footings are sized and poured. This is the exact category of build we cover under multi-level and pool decks, and it's consistently the single largest driver of cost beyond raw square footage.

Railings and Add-Ons

Standard wood or composite balusters cost the least; cable rail, glass panels, and premium composite railing systems all add real money. Screening the deck in or adding a cover are worthwhile upgrades, but each is its own line item stacked on top of the base structure.

Permits and Engineering

Any deck attached to the house or elevated more than a step or two in the City of Alpharetta or unincorporated Fulton County needs a permit, and most require engineered plans. That's a genuine cost, not a formality worth skipping — our Alpharetta permit guide covers exactly what gets checked and why it matters at resale.

Site Access

A tight side yard, an existing patio slab that has to come out first, or a sloped lot all add labor hours a phone quote can't account for — one reason an in-person walkthrough beats a number given sight-unseen.

Getting a Number You Can Actually Trust

Every lot in Alpharetta and the surrounding North Fulton communities is different, which is exactly why we don't quote sight-unseen. We'll walk your yard, talk through material options, and hand you a written estimate broken into the categories above. Knowing what's inside the number means you'll recognize a fair quote — and a padded one — the moment you see it.