Concrete Slabs & Foundations in Ann Arbor, MI

Concrete Slabs & Foundations in Ann Arbor are the backbone of every permanent structure on your property, from garages and sheds to room additions and new builds. Ann Arbor's glacial soils present real challenges: heavy clay till on the west and south sides holds water and heaves with frost, while sandy outwash to the north and east demands different engineering. With freeze-thaw cycles running dozens deep each winter and frost penetration exceeding three feet, a properly engineered slab with correct base preparation and steel reinforcement is not optional, it is essential. The Old West Side, Kerrytown, and Water Hill neighborhoods sit on clay that shifts; Burns Park and Ann Arbor Hills see steeper slopes with different drainage. We pour concrete slabs and footings built to local soil conditions, frost depth, and load requirements so your structure stays level and crack-free for decades.

Why Concrete Slabs & Foundations Matter in Ann Arbor's Freeze-Thaw Climate

Ann Arbor winters are long, grey, and relentless. Frost reaches more than three feet into the ground, and the soil expands and contracts with every freeze-thaw cycle. A shallow or poorly compacted base fails catastrophically: concrete heaves, cracks, and settles unevenly within just a few seasons. Homeowners on the west side, where clay till dominates, see the worst damage. A foundation slab engineered to frost depth with proper base compaction prevents this cycle entirely. Correct thickness, reinforcement, and drainage keep your garage floor, shed pad, or room addition stable and level for life.

We set base depth below frost line to prevent heave and settling caused by seasonal ground movement.
We specify steel reinforcement to resist the tensile stress that freeze-thaw cycles create in concrete.
We compact the subgrade in lifts to eliminate voids that trap water and accelerate failure.
We design slope and drainage so surface water runs away from the slab, not into the base.
We pour to engineered thickness for the intended load, whether a light shed or a two-car garage.

These details keep concrete from cracking, settling, and breaking apart under Michigan's seasonal stress. Skipping them is why so many older slabs in Ann Arbor are buckled and unusable.

Key info: Ann Arbor municipal code requires frost protection and proper drainage for all new slabs. Check the City of Ann Arbor Planning Department for local setback and right-of-way rules before you break ground. We handle all permitting coordination.

How We Build Concrete Slabs & Foundations in Ann Arbor: Our Process

Every slab starts with the soil. We begin by evaluating your site, the frost depth, drainage patterns, and the intended load. On clay-heavy west side properties, we may need deeper frost protection or improved base material. On the sandier north and east side, we focus on compaction and perimeter drainage. We then lay out the slab, set formwork to grade, compact the base in controlled lifts, place steel reinforcement at proper spacing, and pour concrete to the engineered thickness. Finishing includes proper slope for drainage and a smooth, durable surface. The concrete cures under controlled conditions so it reaches full strength before you load it.

We excavate to frost depth and evaluate soil conditions, drainage, and bearing capacity at your site.
We compact the subgrade in 4-inch lifts using mechanical equipment until it meets density standards.
We add a gravel base layer and compact it to create a stable, permeable foundation.
We set forms and establish slope so water drains away from the structure.
We place rebar or wire mesh at proper spacing and height to resist tension and cracking.
We pour concrete to the specified thickness and finish the surface for the intended use.
We cure the concrete under cover to ensure it reaches full strength before any load is applied.

This sequence takes 7 to 10 days from excavation to finished slab ready for building. For a garage addition in Burns Park or a shed foundation on the south side, the process is identical but adapted to your soil and slope.

Example: A homeowner on Forest Avenue in Ann Arbor's Old West Side needed a 16x12 garage pad on clay soil. We excavated 48 inches (frost depth plus margin), compacted three lifts of subgrade, added 4 inches of gravel base, set 6-inch slab thickness with #4 rebar at 18 inches on center, poured concrete, and finished with a 2% slope to the north. The slab has been level and crack-free for three years. See our work on Concrete Garage Floors for more examples.

Approach	Description	Best for
Standard Poured Slab	Concrete poured to engineered thickness with rebar reinforcement, proper base, and finished surface.	Garages, sheds, room additions, and new construction foundations where frost depth and load are moderate.
Thickened-Edge Slab	Perimeter reinforced with extra thickness at the edges to resist frost heave and support load-bearing walls.	Foundations for new homes, additions with concrete stem walls, and high-load applications on clay soils.
Floating Slab	Slab independent of perimeter wall, with controlled movement joints and insulation for seasonal movement.	Conditioned spaces like garages with utilities or radiant heating where thermal and frost movement must be managed.
Monolithic Footing & Slab	Footing and slab poured in one pour, below frost line, with integrated reinforcement for strength and durability.	New construction, permanent structures, and projects where foundation integrity and freeze-thaw resistance are critical.

Concrete Slabs & Foundations Cost in Ann Arbor: What to Expect

A concrete slab in Ann Arbor typically starts at $5 per square foot for a basic 4-inch slab with standard base prep and rebar. A 20x20 garage pad runs roughly $2,000 to $2,500 at that rate. However, several factors push the price up: soil conditions (clay requires deeper frost protection and better compaction), frost depth (Michigan's 3+ feet means more excavation), reinforcement specifications (thicker slabs or high-load applications need more steel), and site access (tight driveways, mature trees, or steep slopes add labor). A thickened-edge slab for a new foundation addition can reach $8 to $12 per square foot. Getting two or three estimates from insured contractors lets you compare base cost, frost strategy, and warranty terms. See our full pricing guide for detailed breakdowns by project type and scope.

What to Look for When Hiring a Concrete Contractor Near Ann Arbor

Hiring the right contractor for your slab or foundation is the difference between a level, durable pad and a cracked, settling mess in five years. Start by asking for proof of general liability insurance and workers compensation coverage. Every reputable contractor carries both and will email you a certificate of insurance without hesitation. Get at least two or three written estimates that spell out frost depth, base prep, reinforcement, thickness, and finish. Call references and ask how their slabs have held up through multiple winters. Ask about local permitting: does the contractor handle right-of-way and curb-cut paperwork, or do you? If you have an HOA, check whether your covenants require slab approval before work starts. Finally, make sure the contractor is responsive and clear about timeline and cost before you sign. Contact us for a free, no-obligation estimate and we will walk you through every detail.

Call (734) 249-8552 for a free estimate or to discuss your slab or foundation project.

Concrete Slabs & Foundations in Ann Arbor: Pricing Guide

Service	Price	Details
Standard Poured Slab (4-6 inch)	Starting at $5/sq ft	Base excavation, compaction, gravel base, rebar, concrete pour, and finished surface for garage or shed pad
Thickened-Edge or Foundation Slab	Starting at $8/sq ft	Deeper frost protection, perimeter reinforcement, and extra thickness for new construction or load-bearing walls
Monolithic Footing & Slab	Starting at $10/sq ft	Integrated footing and slab below frost line in one pour, engineered for permanent structures and maximum durability
Complex Site or High-Load Application	On estimate	Clay soil with poor drainage, steep slopes, mature trees, or specialized load requirements need on-site evaluation first
Travel and Mobilization	Included	No separate mileage or call-out fee within Ann Arbor and surrounding service areas
Free Estimate	No obligation	Response within 24 hours at (734) 249-8552, includes site evaluation, soil assessment, and written proposal

Indicative pricing, the exact cost depends on square footage, finish, and site access. Free personalized estimate within 24h at (734) 249-8552.

Concrete Slabs & Foundations: service areas

📍 Ann Arbor 📍 Ypsilanti 📍 Saline 📍 Dexter 📍 Chelsea 📍 Milan 📍 Plymouth 📍 Northville 📍 South Lyon 📍 Brighton 📍 Belleville 📍 Novi 📍 Livonia 📍 Tecumseh 📍 Howell 📍 Adrian

Frequently asked questions: Concrete Slabs & Foundations in Ann Arbor

How much does a concrete slab cost in Ann Arbor?

A standard 4-inch poured slab starts at $5 per square foot, so a 20x20 garage pad runs roughly $2,000 to $2,500. Thickened-edge or foundation slabs for new construction cost $8 to $12 per square foot because they include deeper frost protection and more reinforcement. Clay soil, steep sites, and tight access can push costs higher. Get two or three written estimates to compare.

Why do concrete slabs fail so quickly in Ann Arbor?

Ann Arbor's freeze-thaw cycle is brutal. Frost reaches more than three feet, and concrete that is not set below that depth heaves and cracks every winter. Shallow or poorly compacted bases let water in, which expands when it freezes and breaks the concrete apart. Many older slabs in the Old West Side and on the south side fail because they were not engineered for Michigan's soil and climate. A properly built slab with correct frost depth and base prep lasts decades.

What is the frost line depth in Ann Arbor?

Ann Arbor frost depth is typically 42 to 48 inches, depending on soil type and elevation. West-side clay soils can frost deeper; sandy north-side soils may be slightly shallower. All new slabs and footings must be set below frost line to prevent heave. We evaluate your specific site and set depth accordingly.

How long does it take to pour a concrete slab in Ann Arbor?

From excavation to finished slab ready for building takes 7 to 10 days. Excavation and base prep take 2 to 3 days, forms and reinforcement 1 to 2 days, the pour itself a few hours, and curing another 3 to 5 days before you can load the slab. Large or complex jobs may take longer. Weather delays in winter or heavy rain can add days.

Do I need a permit for a concrete slab in Ann Arbor?

Most new slabs require a building permit from the City of Ann Arbor. If the slab is near the curb or in the right-of-way, you need a curb-cut permit. We handle all permit coordination and work with the city to ensure your project meets frost protection, setback, and drainage requirements. Ask your contractor to manage permitting so you avoid delays and fines.

What is the difference between a slab and a footing?

A slab is a horizontal concrete pad that sits on a compacted base and carries lighter loads like a garage floor or shed. A footing is a below-grade concrete base that supports a wall or structure and must extend below frost line. A monolithic footing and slab combines both in one pour, with the footing portion below grade and the slab portion above, making it ideal for new construction and permanent buildings.

What is the best time of year to pour a concrete slab in Ann Arbor?

Late spring through early fall (May to September) is ideal because temperatures stay above 50 degrees and concrete cures properly. Winter pours are risky: cold slows curing, frost can damage fresh concrete, and snow or ice complicates site prep. Early spring or late fall can work if temperatures stay mild. Plan your project for warm months so the concrete reaches full strength before winter freeze-thaw cycles begin.

Can you repair a cracked or settling concrete slab in Ann Arbor?

Yes. Small cracks can be sealed. Settled or heaved slabs can sometimes be lifted back to grade using concrete leveling (slab jacking). Severely damaged slabs may need removal and replacement. We assess the damage and recommend the most cost-effective repair. See our Concrete Repair & Resurfacing and Concrete Leveling & Slab Lifting pages for details.

Are you insured for concrete slab work in Ann Arbor?

Yes. We carry full general liability insurance and workers compensation coverage on every project. This protects you and your property if an accident occurs during the pour or curing process.

How do I get a free estimate for a concrete slab in Ann Arbor?

Call us at (734) 249-8552 or use our contact form. We respond within 24 hours, visit your site, assess soil and frost conditions, measure the area, and provide a written estimate with no obligation. We explain frost depth, base strategy, reinforcement, and timeline so you understand exactly what you are getting and why it costs what it does.