How Much Does It Cost to Build a Deck in Mobile, AL? [2026 Guide]

If you’re planning a new deck in Mobile, AL, Fairhope, Daphne, Spanish Fort, or elsewhere along Alabama’s Gulf Coast, one of the first questions is usually: how much is this actually going to cost?

In 2026, homeowners planning a professionally built deck in the Mobile, AL area should generally budget around $40 to $80 per square foot for a conventional open deck. A basic pressure-treated wood deck may start near $40 per square foot, while composite, PVC, elevated decks, second-story decks, covered decks, and high-end coastal projects can exceed $70 to $125+ per square foot.

Your final price depends on much more than deck size. Height, stairs, railings, materials, site access, demolition, permits, foundations, coastal exposure, and custom features can all substantially affect the final investment. For pricing that applies across the state rather than the Gulf Coast specifically, see our general Alabama deck cost guide.

Deck Cost in Mobile, AL at a Glance

Deck Type	Estimated 2026 Planning Range
Basic ground-level deck	$35 to $55/sq. ft.
Pressure-treated deck	$40 to $60/sq. ft.
Composite deck	$55 to $80/sq. ft.
Elevated deck	$50 to $70/sq. ft.
Second-story deck	$55 to $90+/sq. ft.
Covered deck	$80 to $120+/sq. ft.
High-end outdoor living project	$125+/sq. ft. possible

These numbers are best used as planning ranges, not exact quotes. A simple rectangular deck close to the ground is very different from a second-story composite deck with aluminum railing, stairs, lighting, and a roof.

Deck Cost by Size

Here is a practical starting point for common deck sizes.

Deck Size	Area	Pressure-Treated Wood	Composite / Upgraded
10 × 10	100 sq. ft.	$4,000 to $6,000	$5,500 to $8,000
10 × 12	120 sq. ft.	$4,800 to $7,200	$6,600 to $9,600
12 × 12	144 sq. ft.	$5,760 to $8,640	$7,920 to $11,520
12 × 16	192 sq. ft.	$7,680 to $11,520	$10,560 to $15,360
12 × 20	240 sq. ft.	$9,600 to $14,400	$13,200 to $19,200
14 × 20	280 sq. ft.	$11,200 to $16,800	$15,400 to $22,400
16 × 20	320 sq. ft.	$12,800 to $19,200	$17,600 to $25,600
20 × 20	400 sq. ft.	$16,000 to $24,000	$22,000 to $32,000

Working with a smaller footprint? We break the numbers down further in our guide to the cost to build a 200 sq. ft. deck in Alabama.

How Much Does a 12 × 20 Deck Cost?

A 12 × 20 deck contains 240 square feet. A typical planning budget is approximately:

• Pressure-treated wood: $9,600 to $14,400
• Composite or upgraded construction: $13,200 to $19,200

Railings, stairs, demolition, roof structures, engineering, difficult access, and coastal construction requirements can increase the price.

Deck Cost by Material

Decking material has a major impact on both initial price and long-term maintenance.

Material	Estimated Complete Installed Range
Pressure-treated pine	$40 to $60/sq. ft.
Composite	$55 to $80/sq. ft.
PVC	$60 to $90/sq. ft.
Premium hardwood	$50 to $90+/sq. ft.
Aluminum / metal systems	$70 to $110+/sq. ft.

It is important to distinguish deck-board pricing from complete deck construction. You may see composite boards advertised for only a few dollars per square foot. That does not include framing, foundations, hardware, railings, stairs, labor, permitting, demolition, or site preparation.

Pressure-Treated Wood Deck Cost

Pressure-treated pine is usually the most economical option. For homeowners in the Mobile, AL area, a complete professionally built pressure-treated deck will often fall around $40 to $60 per square foot.

Pressure-treated wood works well in South Alabama, but it requires more maintenance than composite or PVC. Regular cleaning and periodic sealing or staining help protect the deck from moisture, UV exposure, cracking, and warping.

Composite Deck Cost in Mobile, AL

Composite decking typically costs more upfront but requires significantly less maintenance. A professionally constructed composite deck in coastal Alabama will often budget around $55 to $80 per square foot.

Premium product lines, complex railings, elevated structures, and custom layouts can move the project above this range — we explain where that money goes in our breakdown of why premium composite decking costs more. Composite is particularly attractive in Mobile, AL because it offers strong resistance to moisture, insects, and decay.

For a closer look at regional pricing and brand-level differences, see our guides to composite deck cost in South Alabama and our Trex vs. Fiberon vs. WearDeck comparison.

PVC Decking Cost

PVC decking typically falls around $60 to $90 per square foot installed.

Unlike composite decking, PVC deck boards contain no wood fiber. That can make PVC particularly attractive in areas exposed to high humidity and frequent moisture. Its main disadvantage is the higher initial investment — a trade-off we compare directly in PVC decking vs. composite decking.

Hardwood Deck Cost

Premium hardwoods such as ipe can cost approximately $50 to $90+ per square foot installed.

Hardwoods provide a high-end natural appearance and excellent durability, but materials, specialized fasteners, and additional installation labor increase the cost.

Why Do Decks Cost More Near the Alabama Coast?

Building a deck in Mobile, AL or on the Eastern Shore is not exactly the same as building one hundreds of miles inland. The Gulf Coast creates several construction challenges.

Moisture and Heavy Rain

Mobile, AL receives significant rainfall and experiences long periods of humidity. Good deck construction must account for repeated wetting and drying. That can mean greater attention to:

• Ledger flashing
• Drainage
• Joist protection
• Proper ventilation
• Treated framing
• Water-resistant decking
• Proper spacing between boards

Poor moisture detailing can shorten the life of even expensive decking.

Salt-Air Corrosion

Properties near Mobile Bay or the Gulf can experience more aggressive corrosion. Fasteners, connectors, joist hangers, railings, and structural hardware must be compatible with the materials being used and appropriate for the exposure.

Using corrosion-resistant hardware may cost more initially, but replacing failed structural connectors later is far more expensive.

Hurricanes and High Winds

Coastal Alabama also requires builders to think seriously about structural connections. Deck posts, beams, ledgers, foundations, and connections must work together as a complete structural system. Elevated decks, covered decks, and coastal properties may require additional structural consideration.

This is where FORTIFIED construction standards matter on the Gulf Coast. If wind resistance is a priority for your project, read our guide to choosing a FORTIFIED deck builder.

Flood Zones

Some properties in Mobile, AL and Baldwin County fall inside FEMA flood zones. Flood-zone construction can affect:

• Deck elevation
• Foundation design
• Engineering
• Documentation
• Permitting
• Site access

Not every coastal deck requires special flood construction. Requirements depend on the individual property.

How Deck Height Changes the Cost

Height is one of the biggest deck cost variables.

Ground-Level Deck

Typical range: $35 to $55 per square foot

These projects often have simpler foundations, shorter posts, fewer railings, and limited stairs.

Elevated Deck

Typical range: $50 to $70 per square foot

Higher decks require taller posts, more bracing, guardrails, stairs, and more complicated construction.

Second-Story Deck

Typical range: $55 to $90+ per square foot

Second-story decks can require substantially more structural work, longer stair systems, railings, foundations, and connection detailing.

How Much Does a Covered Deck Cost?

A covered deck is no longer simply a deck. You are adding another structure above it. A covered deck in coastal Alabama may budget around $80 to $120+ per square foot.

Costs can include:

• Larger foundations
• Structural posts and beams
• Roof framing
• Roofing
• Electrical
• Lighting
• Ceiling finishes
• Gutters and drainage
• Engineering
• Wind-resistant connections

A covered outdoor living project can easily exceed the cost of a standard open deck.

What Goes Into a Deck Quote?

A professional deck quote can include:

Structural Framing

Joists, beams, posts, ledger boards, blocking, connectors, and foundations create the structural system supporting your deck.

Decking

Your material selection can substantially change the total price. Pressure-treated pine is generally the least expensive mainstream option, while PVC, hardwood, and specialty systems cost significantly more.

Railings

Railings can be one of the most underestimated costs. Options include:

• Pressure-treated wood
• Composite
• Aluminum
• Cable
• Custom railing systems

Premium railings can dramatically increase the final project cost.

Stairs

A few steps from a low deck are inexpensive compared with a full staircase from a second-story deck. Long stair runs require additional framing, railings, landings, foundations, and labor.

Demolition

If an existing deck must be removed before construction begins, demolition and disposal add to the project cost. The condition of the existing framing is also important. Sometimes removing old deck boards reveals structural rot or corroded connectors that were not visible beforehand.

Foundations

Foundation requirements depend on deck height, soil conditions, structural loads, flood-zone requirements, and whether the deck includes a roof.

Permits

Permit requirements and fees vary depending on where your home is located. There is no single “Alabama deck permit.”

Do You Need a Permit for a Deck in Mobile, AL?

Most substantial deck construction will involve local permitting requirements, but the responsible permitting authority depends on the property location. We walk through the paperwork step by step in our Mobile, AL deck permit process guide.

City of Mobile

Deck projects inside Mobile, AL city limits are handled through the City of Mobile’s Build Mobile permitting and inspections department.

Baldwin County

The Baldwin County Building Department handles permitting in unincorporated areas under its jurisdiction. This is important because living in “Baldwin County” does not necessarily mean Baldwin County issues your permit.

Fairhope

Fairhope has its own permitting process and specifically includes decks within its residential small-project permitting system.

Daphne

Daphne maintains its own permit requirements and fee structure for residential projects, including decks. See our detailed guide to deck permit requirements in Daphne, AL.

Spanish Fort

Spanish Fort manages permits through its municipal Building Department.

Gulf Shores

Gulf Shores specifically provides a residential permitting process for additions, remodeling, repairs, decks, and retaining walls.

Orange Beach

Orange Beach operates under its own building codes, coastal requirements, and permit fee structure.

For homeowners along the Eastern Shore and Gulf Coast, identifying the correct jurisdiction early can prevent unnecessary delays.

What Is the Best Decking Material for the Mobile, AL Climate?

There is no single answer for every homeowner. The best choice depends on budget, maintenance expectations, appearance, exposure, and how long you expect to remain in the home.

Material	Cost	Maintenance	Coastal Performance
Pressure-treated pine	Lowest	High	Good when maintained properly
Composite	Medium-high	Low	Very good
PVC	High	Low	Excellent
Premium hardwood	High	Medium	Excellent
Coastal-rated aluminum	Highest	Low	Excellent when correctly specified

For many Mobile, AL homeowners, pressure-treated pine offers the lowest upfront cost, while composite and PVC provide the strongest balance of moisture resistance and low maintenance.

Pressure-Treated vs. Composite Decking

For many homeowners, the decision comes down to wood versus composite. We run the long-term numbers side by side in our comparison of wood decking cost vs. composite in coastal Alabama.

Choose Pressure-Treated Wood If:

• You want the lowest upfront cost.
• You like the appearance of real wood.
• You are comfortable cleaning, sealing, and maintaining the deck.

Choose Composite If:

• You want lower ongoing maintenance.
• You want strong moisture and insect resistance.
• You plan to keep the deck for many years.
• You prefer consistent appearance without regular staining.

Neither option is automatically better. The right choice depends on whether your priority is lower initial investment or lower long-term maintenance.

Should You Repair, Redeck, or Replace Your Deck?

Not every aging deck needs a complete rebuild.

Repair

Repairs may make sense when damage is localized and the underlying structure remains sound. Examples include:

• A few deteriorated boards
• Minor railing repairs
• Localized surface damage

Redeck

Redecking means replacing deck boards and possibly railings while keeping the existing structural frame. This can work when the posts, beams, joists, ledger, connectors, and foundations remain in good condition.

Replace

Full replacement becomes more appropriate when there is:

• Extensive structural rot
• Deteriorated beams or posts
• Ledger damage
• Foundation movement
• Severe connector corrosion
• Unsafe stairs or railings
• Significant structural deficiencies

For coastal decks, structural connectors deserve particular attention because corrosion may be hidden beneath the visible deck surface.

Does Building a Deck Increase Home Value?

A well-designed deck can improve both usability and resale appeal. The 2025 Remodeling Cost vs. Value report found substantial modeled cost recovery for deck additions, although results varied dramatically by market. For Southern Alabama, the report estimated approximately:

• Wood deck: 98% cost recouped
• Composite deck: 66.1% cost recouped

Those numbers should not be interpreted as a guarantee for Mobile, AL. Home value depends on your location, property, deck quality, design, materials, and buyer demand. The strongest reason to build a deck should usually be that you will use and enjoy the space while you own the home.

What Makes a Deck More Expensive?

The largest cost increases usually come from:

• Deck height
• Premium decking materials
• Railings
• Large or complex stair systems
• Roof structures
• Complex deck shapes
• Difficult site access
• Existing-deck demolition
• Flood-zone or coastal requirements
• Electrical and lighting
• Outdoor kitchens or fireplaces
• Custom architectural details

Square footage matters, but it tells only part of the story. A 300-square-foot ground-level pressure-treated deck can cost significantly less than a 300-square-foot second-story composite deck with stairs and premium railings.

Frequently Asked Questions

How much does it cost to build a deck in Mobile, AL?

For 2026 planning purposes, many professionally built open decks will fall around $40 to $80 per square foot, depending on materials, height, stairs, railings, site conditions, and design.

How much does a 12 × 20 deck cost?

A 12 × 20 deck contains 240 square feet. A pressure-treated deck may budget around $9,600 to $14,400, while composite or upgraded construction may fall around $13,200 to $19,200.

How much does a 16 × 20 composite deck cost?

A 320-square-foot composite deck may budget around $17,600 to $25,600, depending on railing, height, stairs, site conditions, and product selection.

What is the cheapest decking material?

Pressure-treated pine is generally the most economical mainstream decking material.

Is composite decking worth the extra cost?

It can be, especially for homeowners prioritizing lower maintenance, moisture resistance, and long-term durability.

What decking works best near salt water?

PVC, capped composite, premium hardwood, and properly specified coastal-rated metal systems can all perform well. The structural framing, connectors, fasteners, and railings are just as important as the deck boards.

Does a second-story deck cost more?

Yes. Second-story decks typically require more structural framing, bracing, railings, stairs, foundations, and labor.

Do I need a permit for a deck in Baldwin County?

Usually, but the correct permitting authority depends on the property’s jurisdiction. Homes inside Fairhope, Daphne, Spanish Fort, Gulf Shores, Orange Beach, and other incorporated municipalities generally work with the municipality rather than Baldwin County’s permitting department.

How Deck Costs Vary Across Mobile Neighborhoods

Where you live in Mobile can shape the final number. In Spring Hill (36608), large live oaks and established landscaping can mean extra planning around roots, tree protection, and access for materials. In west Mobile neighborhoods like Heron Lakes, Sugar Creek, and Regency Oaks (36695), HOA design guidelines may affect railing styles, deck height, or material colors, and backyard access can change how materials are delivered. Your builder should account for these details in the estimate rather than adding them later. For more on what to look for, see our neighborhood guide for Mobile homeowners, or learn about our outdoor living contractors in Mobile.

Get a Deck Estimate for Your Mobile, AL Area Home

A cost-per-square-foot estimate is useful for early planning, but it cannot account for everything that makes your property and project unique.

At Red Branch Outdoor Living, we design and build custom decks and outdoor living spaces throughout Mobile, AL, Baldwin County, and the Eastern Shore. If you are still in the planning stage, our guide to deck building in Mobile, AL walks through design, materials, and what to expect from the build.

Whether you’re considering a simple pressure-treated deck, a low-maintenance composite deck, an elevated structure, or a complete covered outdoor living area, we can help you understand your options and develop a project around your home, budget, and goals.

Start with a preliminary deck estimate or schedule a consultation with Red Branch Outdoor Living.

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Pricing in this guide represents planning estimates only, based on current regional and national construction data. Actual project pricing varies by property, design, materials, structural requirements, permits, site conditions, and custom features. To determine an actual estimate or quote, an in-person visit is required.