Concrete Slab Contractor
fairfax county, va

Precision-Poured Concrete Slabs Built to Last

When you need a concrete slab that won’t crack, shift, or fail over time, trust Fairfax Custom Concrete. We are experienced concrete slab contractors serving Fairfax County, VA, delivering strong, code-compliant slabs for residential and light commercial projects.

From garage slabs and shed pads to home additions and equipment slabs, we build every slab from the ground up with durability, drainage, and long-term performance in mind.

We proudly serve homeowners, property managers, and builders throughout Fairfax County and surrounding Northern Virginia communities.

A concrete floor is being built in a backyard next to a green fence.
A group of construction workers are working on a concrete walkway.

Why Choose Us as Your Concrete Slab Contractor in Fairfax County?

Built for Northern Virginia Soil Conditions

Much of Fairfax County has clay-heavy soil, which expands when wet and shrinks when dry. If not handled correctly, this movement can cause cracking and settlement.

That’s why every slab we install includes:

  • Proper site evaluation and soil review

  • Subgrade compaction to industry standards

  • Vapor barriers to block ground moisture

  • Rebar or mesh reinforcement based on load needs

This approach helps prevent sinking, heaving, and moisture damage—giving you a slab that lasts for decades.

Request a Free Estimate Today
 📞 (703) 646-1772


testimonial

What Our Clients Are Saying

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"I hired Concrete Sergeant to pour a reinforced slab for my detached garage in Edgewater. They showed up on time, gave me a clear quote with no surprises, and had the whole thing prepped and poured in just two days. The surface is level, solid, and exactly what I needed for a heavy-duty use case. Their knowledge of local codes and grading made a big difference"

Brian M., Edgewater, MD

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"We had Concrete Sergeant install a slab for our backyard hot tub area, and we couldn’t be happier. They helped us figure out the right thickness and finish, and even graded it perfectly for drainage. The team was courteous, efficient, and left the site cleaner than when they arrived. Highly recommend for any outdoor slab projects.

Laura H., Crofton, MD

A man is pumping concrete into a concrete slab at a construction site.
A group of people are working on a sidewalk.

Types of Concrete Slabs We Install

Not all slabs are the same. The right slab depends on how it will be used.

We install concrete slabs for:

Garage Slabs

Designed to support vehicle weight and daily use with proper reinforcement and thickness.


Shed & workshop Slabs

Level, stable pads that protect structures from ground moisture and movement.


home additions & foundations

Engineered slabs that meet local code requirements and structural needs.


equipment & utility pads

Heavy-duty slabs built for generators, HVAC units, and other equipment.


Not sure which slab type you need?
We offer free site visits across Fairfax County to help you decide.

How Thick Should a Concrete Slab Be?

Thickness plays a major role in slab strength and lifespan. Based on local codes and industry standards, we typically recommend:

  • Garage slabs: 4"–6" thick with rebar grid

  • Home additions / foundations: 6" thick with integrated footings if required

  • Shed pads & walkways: 4" thick

  • Heavy-duty slabs: 6"+ with added reinforcement

Soil conditions and load requirements are always reviewed before finalizing slab specs.

A concrete floor is being built in a backyard next to a green fence.
A concrete floor is being built in a backyard next to a green fence.

Concrete Slab Reinforcement Options

Reinforcement helps control cracking and improves load capacity.

Depending on your project, we may use:

  • Steel rebar (#3, #4, or #5) placed in a grid

  • Welded wire mesh for lighter-duty slabs

  • Fiber-reinforced concrete to reduce shrinkage cracks

We choose reinforcement based on slab size, use, and soil conditions.

Our Concrete Slab Installation Process

Every slab is installed using proven methods and industry standards.


01

Site Evaluation

We review soil type, drainage, slope, and access. If needed, we recommend grading or drainage solutions.


02

Formwork & Base Preparation

  • Precision form setup

  • Compacted stone base

  • Vapor barrier installation

03

Reinforcement

  • Rebar or mesh placed and secured

  • Control joints planned before the pour

04

Concrete Pour & Finishing

  • Quality concrete mix

  • Controlled placement and finishing

  • Smooth or broom finish as needed

05

Curing & Protection

Proper curing is critical. We follow best practices to ensure full strength and durability.


A concrete floor is being built in a backyard next to a green fence.

Why Subbase Preparation Matters :

What’s under the slab is just as important as the concrete itself.

We prepare every slab with:

  • Compacted gravel base

  • Moisture barrier

  • Accurate grading for drainage

Poor subbase prep is one of the most common causes of slab failure. We don’t skip this step.


What Causes Concrete Slabs to Crack?

Common causes include:

  • Poor soil compaction

  • Missing control joints

  • Improper curing

  • Temperature changes

  • Water pooling under the slab


How We Prevent Cracking



  • Proper joint placement

  • Controlled concrete mixes

  • Correct curing methods

  • Drainage planning

Good planning upfront prevents problems later.

Do You Need a Permit for a Concrete Slab in Fairfax County?

In many cases, yes—especially for:

  • Garage slabs

  • Home additions

  • Slabs tied to structures or utilities

We follow Fairfax County and Virginia building codes and guide you through the process when permits are required.

Concrete Slab Cost in
Fairfax County, VA

Pricing depends on size, thickness, reinforcement, and site conditions.

Typical Price Ranges (Per Sq. Ft.)

  • Basic slab: $8 – $10

  • Garage or foundation slab: $10 – $14

  • Decorative or heavy-duty slab: $12 – $18

For accurate pricing, we recommend a free on-site estimate.

(703) 646-1772


Concrete Slab Maintenance Tips :

To extend the life of your slab:

  • Seal every 2–3 years

  • Keep the surface clean

  • Avoid harsh de-icing chemicals

  • Repair small cracks early

  • Maintain proper drainage

Simple maintenance can add years to your concrete.


Frequently Asked Questions – Concrete Slabs

  • How long does slab installation take?

     Most slab projects take 1–3 days, depending on size and weather.


  • Can slabs be poured year-round?

     Yes, with proper planning for temperature conditions.


  • What finishes are available?

    Smooth, broom, and light decorative finishes are available.


  • Are estimates free?

     Yes. All estimates are free and no-obligation.


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Service Areas

We proudly serve:

Fairfax

Arlington

Alexandria

Springfield

Reston

Herndon

Sterling

Leesberg

Centerville

Chantilly

Woodbridge

Tysons Corner

Falls Church

If you’re in or near Fairfax County, VA, we can help.


Work With a Trusted Concrete Slab Contractor in Fairfax County, VA

Concrete slabs are the foundation of your project—don’t take shortcuts.

Contact Fairfax Custom Concrete for expert installation, honest pricing, and dependable results.

📞 (703) 646-1772
📧 northrop.james@gmail.com

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