A custom deck in Alpharetta usually costs between $65,000 and $200,000, and where a project lands in that range comes down to size, materials, and how much design goes into it.
At Peachtree Decks & Porches, most of our new Alpharetta decks fall inside that band, with a straightforward board replacement starting lower and a large multi-level build with premium railing and lighting reaching the top.
That is a wide spread, so it helps to see what actually moves the number.
What Sets the Price of a Custom Deck
Three things drive most of the cost: square footage, the decking and railing materials you choose, and the complexity of the structure underneath. A flat deck off the back door is a different job from a raised deck that steps down a sloped Alpharetta lot to a walk-out basement.
Here is where our custom deck projects tend to land in 2026:
| Project type | Typical size | 2026 range |
| New standard composite deck | 300 to 500 sq ft | $65,000 to $100,000 |
| New premium composite deck | 400 to 600 sq ft | $100,000 to $200,000 |
| Board replacement on sound framing | 400 to 500 sq ft | $45,000 to $75,000 |
On a per-square-foot basis, a standard custom build runs about $130 to $160, and a premium deck with higher-end materials and detailing can reach roughly $240.
Materials Make the Biggest Swing
Decking is where taste meets budget. The composite line you pick changes the surface cost quite a bit:
- Trex Enhance: about $12 to $14 per square foot
- Trex Transcend: about $21 to $28 per square foot
- Trex Signature: about $29 to $44 per square foot
Railing is the other big lever. A standard composite rail runs about $75 to $110 per linear foot, while a cable system that keeps sightlines open runs closer to $190 to $265 per linear foot. On a deck with long railing runs and a few sets of stairs, that one choice can shift the total by thousands.
The Costs People Forget
A few line items sit outside the boards and rails, and they tend to surprise homeowners:
- Engineering and drafting: about $450 to $2,800, depending on how complex the structure and permitting are
- Permit administration: roughly $400 to $600
- Site and grade work: a steep lot, tall footings, or tight access all add labor
You will also need a permit. Most residential deck projects here pull one and pass inspections through the City of Alpharetta’s Construction and Inspections division, and a builder who manages that paperwork keeps the schedule from stalling.
Lighting, under-deck drainage, and built-in seating are popular extras that nudge the total upward too, so it pays to decide on them before the design is locked in rather than after.
Why Alpharetta Decks Cost What They Do
Alpharetta’s rolling, wooded lots north of the Chattahoochee are a big reason decks here sit at the higher end. Many homes have back yards that fall away toward a walk-out basement, so the deck has to be engineered and framed to carry real height.
Footings sized for Georgia clay and a properly bolted ledger are what let a deck stand up to humid summers and the occasional January ice storm.
Neighborhood covenants play a part too. In Alpharetta’s HOA-heavy communities, design review can shape materials, railing style, and color, and building to that standard the first time around avoids costly rework.
Real Alpharetta-Area Projects
Numbers land better with examples. Recent custom deck and outdoor living projects we have built came in around $93,493, $98,290, $117,287, and $172,838.
Each of those reflects a real scope: the materials chosen, the size of the structure, and the site it was built on. A quote for your yard follows the same logic, built from your actual lot and wish list rather than a generic price per foot.
A Few Quick Questions
Why do custom decks in Alpharetta start so high?
Our decks are engineered and built with low-maintenance, high-performance materials for homes where the deck is a long-term investment. The framing, flashing, and detailing under the surface cost real money, and they are what keep a deck sound for decades.
Can I lower the cost without cheapening the deck?
Yes. Adjusting the size, choosing a mid-tier composite, and simplifying the railing are the three cleanest ways to bring a budget down while keeping the build solid.
Is a permit really required for a deck?
For nearly all attached decks, yes. Alpharetta reviews and inspects the work, and we handle the drawings and permitting as part of the project.
How long does a custom deck build take?
Most of our Alpharetta decks run a few weeks on site once the permit clears. The exact timeline depends on the size of the structure, the weather, and how much custom detail the design calls for.
Let’s Put a Real Number on Your Deck
Every yard, slope, and wish list is different, so the surest way to know your cost is a walkthrough and a real quote. When you are ready, take a look at how we approach custom deck building here, and we will map out a design and a budget for your lot.
Call us at (770) 667-2650 or message us here.
