A 30x30 concrete slab requires 11.11 cubic yards of concrete at 4 inches thick, which translates to approximately 500 bags of 80-pound concrete mix or 667 bags of 60-pound mix. Professionally installed, a 30x30 slab costs $5,400 to $10,800 in 2026 for a standard 4-inch residential pour.
The 30x30 slab is a serious concrete project. At 900 square feet, it is the standard size for a two-car garage, a full workshop, an RV parking pad, or a small commercial foundation. This is not a weekend DIY project — it requires professional equipment, a skilled crew, and careful logistics.
This guide gives you exact numbers. We have broken down the concrete volume calculation, material quantities, cost by thickness, reinforcement options, truck logistics, and regional pricing — all based on 2026 data from HomeGuide, MetalAmerica, NRMCA, and contractor networks across the US.
Who should use this guide: Homeowners planning a 30x30 concrete project, contractors estimating material orders, and anyone using the Concrete Slab Cost Calculator who wants to understand the math behind the results.
Need a smaller slab? See our 20x20 concrete slab cost guide for a complete breakdown of the most common residential size, or our concrete slab cost overview for general pricing.
Quick Answer: 30x30 Concrete Slab (2026)
| Spec | 4-Inch Slab | 5-Inch Slab | 6-Inch Slab |
|---|---|---|---|
| Square footage | 900 sq ft | 900 sq ft | 900 sq ft |
| Cubic yards | 11.11 yd³ | 13.89 yd³ | 16.67 yd³ |
| 80lb bags | 500 bags | 625 bags | 750 bags |
| 60lb bags | 667 bags | 833 bags | 1,000 bags |
| Ready-mix cost | $1,390 – $2,110 | $1,735 – $2,640 | $2,085 – $3,170 |
| Installed cost | $5,400 – $10,800 | $7,200 – $12,600 | $9,000 – $15,000 |
| Best for | Patios, large workshops | Garages, light commercial | Driveways, RV pads, foundations |
How to Calculate Concrete for a 30x30 Slab
The formula is the same as any slab, but the numbers are much larger. A miscalculation at this scale means hundreds of extra bags or a short pour — both expensive mistakes.
The Formula
Volume (cubic yards) = (Length × Width × Thickness in feet) ÷ 27
All dimensions must be in feet. If your thickness is in inches, divide by 12 first.
Worked Example: 30x30 at 4 Inches
4 inches ÷ 12 = 0.333 feet
30 ft × 30 ft × 0.333 ft = 300 cubic feet
300 ÷ 27 = 11.11 cubic yards
80lb bags (0.60 cu ft each): 300 ÷ 0.60 = 500 bags
60lb bags (0.45 cu ft each): 300 ÷ 0.45 = 667 bags
Always order 10% extra for spills, uneven ground, and measurement errors.
80lb bags with 10% waste: 500 × 1.10 = 550 bags
60lb bags with 10% waste: 667 × 1.10 = 734 bags
Use Our Free Concrete Calculator
Our Concrete Slab Cost Calculator does all the math instantly. Enter 30 feet by 30 feet, choose your thickness, and get cubic yards, bag count, material cost, and total installed estimate. No signup required.
Concrete Slab Cost CalculatorWhat Drives the Price of a 30x30 Slab?
Understanding why concrete slab costs vary helps you compare contractor bids like-for-like. According to Estimators.us, every installed concrete slab price involves four cost layers: Materials (40–50%), Labor (45–55%), Site preparation (10–15%), and Equipment (5–10%).
| Cost Driver | Impact on 30×30 | How to Control |
|---|---|---|
| Slab thickness | Each inch adds ~$900 in material + $1,350 in labor | Match thickness to actual use — don't over-engineer |
| Reinforcement type | Wire mesh $315 vs rebar $1,050–$1,860 | Use wire mesh for patios, rebar only for vehicles |
| Site access | Pump truck adds $400–$800 if truck can't reach | Ensure truck can park within 20 feet of pour site |
| Region | ±40% variation (Texas $5.31/sqft vs California $8.53/sqft) | Get 3+ local quotes for fair comparison |
| Finish type | Broom $0 vs stamped $9–$16/sqft added | Start with broom, upgrade later with stain |
| Soil conditions | Poor soil adds $800–$2,400 for deeper excavation | Get soil test before bidding |
| Permits | $100–$1,500 depending on municipality | Check local codes before starting |
| Timing | Off-season (late fall/early spring) saves 5–15% | Schedule pour for slow season |
What the data says: The biggest cost variables are thickness, region, and finish type. A 30x30 slab in the Southeast with broom finish costs roughly half of the same slab in the Northeast with stamped finish. According to LawnStarter, the national average is $6.60/sqft with a range of $4.34–$7.73 for basic work. Getting 3 itemized quotes with the same specifications is the single most effective way to ensure fair pricing.
30x30 Slab Cost by Thickness
Thickness is the biggest cost driver for a 30x30 slab. At 900 square feet, each additional inch adds roughly $900–$1,800 to your total.
| Thickness | Cubic Yards | Concrete Only | Installed Cost | Best For |
|---|---|---|---|---|
| 4 inches | 11.11 | $1,390 – $2,110 | $5,400 – $10,800 | Patios, large workshops (standard) |
| 5 inches | 13.89 | $1,735 – $2,640 | $7,200 – $12,600 | Garages, light commercial |
| 6 inches | 16.67 | $2,085 – $3,170 | $9,000 – $15,000 | Garages, RV pads, foundations |
| 8 inches | 22.22 | $2,780 – $4,220 | $12,000 – $20,000 | Heavy equipment, commercial, structural |
What the data says: A 6-inch slab is the standard for most 30x30 garage and workshop projects. Going from 4 inches to 6 inches adds about $3,600–$4,200 to your total but provides significantly more load capacity. According to This Old House, each additional inch adds roughly $1/sqft in material and labor. For a 900 sqft slab, that is approximately $900 per inch. A 4-inch slab uses 1.23 cubic yards per 100 sqft (Estimators.us), while a 6-inch slab uses 1.85 cubic yards per 100 sqft — 50% more concrete volume.
30x30 Slab Cost by Finish Type
The surface finish affects both cost and appearance. At 900 square feet, finish upgrades scale linearly.
| Finish Type | Added Cost | Total 30x30 Cost | Look & Durability |
|---|---|---|---|
| Broom finish | $0 (standard) | $5,400 – $10,800 | Textured, slip-resistant, hides imperfections |
| Smooth trowel | $450 – $900 | $5,850 – $11,700 | Clean, modern, can be slippery when wet |
| Exposed aggregate | $1,800 – $3,600 | $7,200 – $14,400 | Decorative stone visible, excellent traction |
| Stamped concrete | $9,000 – $14,625 | $14,400 – $25,425 | Brick, stone, or wood patterns ($9–$16.25/sqft per LawnStarter) |
| Colored (integral) | $3,060 – $8,775 | $8,460 – $19,575 | Uniform color, fade-resistant ($3.40–$9.75/sqft per LawnStarter) |
| Polished | $2,700 – $6,525 | $8,100 – $17,325 | Mirror-like, indoor use ($3–$7.25/sqft per This Old House) |
What the data says: Broom finish is the default for most 30x30 slabs and adds no extra cost. For a workshop or garage, broom finish provides excellent traction. Stamped or colored finishes make sense for a large patio or outdoor living space but add $4,500–$10,800 to the project.
30x30 Slab Cost by Reinforcement
At 900 square feet, reinforcement is critical. A 30x30 slab without proper reinforcement will crack under its own weight, let alone vehicle traffic. Here is exactly what each option costs and how many materials you need.
| Reinforcement Type | Quantity Needed | Material Cost | Strength | Best For |
|---|---|---|---|---|
| Wire mesh (6x6, W1.4/W1.4) | 18 sheets (5×10 ft), overlapping 1.5 squares | $315 – $630 | Moderate | Patios, walkways, foot-traffic areas |
| #4 rebar, 18" grid | 40 bars (20 each way), 70 sticks (20 ft), ~935 lbs | $1,050 – $1,400 | High | Garages, workshops, foundations |
| #4 rebar, 12" grid | 62 bars (31 each way), 93 sticks (20 ft), ~1,240 lbs | $1,395 – $1,860 | Very High | Heavy loads, commercial, RV pads |
| Fiber mesh (in mix) | Added at batch plant | $110 – $170 | Low-Moderate | Crack-resistant floors, supplemental only |
| #4 rebar + wire mesh | 40 bars + 18 sheets | $1,365 – $2,030 | Maximum | Heavy equipment, maximum durability |
What the data says: For a 30x30 garage or workshop, #4 rebar at 18-inch spacing is the minimum acceptable reinforcement. This requires 40 bars total (20 running each direction), creating a grid of 30×30 sections. Wire mesh ($315–$630) is acceptable for patios and foot-traffic areas per Concrete Network and This Old House. For vehicle traffic, upgrade to rebar — a 30x30 driveway with only wire mesh will develop structural cracks within 2–3 years. The rebar material cost difference between 18" and 12" spacing is $345–$460, but the 12" grid provides significantly more load capacity for RV pads and commercial use.
Why 30x30 Is NOT a DIY Project
Let us be direct: a 30x30 concrete slab is too large, too heavy, and too time-sensitive for DIY. According to BackyardCalcs, "past ~100 sqft bags stop being a serious option: a slab needs to be poured wet-on-wet in one session, and hand-mixing can't keep pace." At 900 square feet, you are 9× that threshold.
| Factor | 20x20 (400 sqft) | 30x30 (900 sqft) | Impact |
|---|---|---|---|
| Concrete volume | 4.93 yd³ | 11.11 yd³ | 2.25× more material |
| Truck loads | 1 partial truck | 1 full truck + partial | Multiple deliveries or volumetric mixer |
| Short-load fee | $50 – $110 | Often waived (10+ yd) | 30x30 may save on short-load |
| Crew size | 4–6 people | 6–8 people | Larger crew needed |
| Pour time | 6–8 hours | 8–12 hours | Full day project |
| Pump truck | Rarely needed | Often needed ($400–$800) | Additional cost |
| Power trowel | Optional | Essential for 900 sqft | Rental cost $150–$300/day |
| Control joints | Every 10 ft | Every 10 ft (3×3 grid) | More joints to cut |
| Weight | 19,980 lbs | 45,000 lbs | 2.25× heavier |
Truck Logistics: Getting 11+ Yards to Your Site
Truck logistics are the single biggest planning challenge for a 30x30 slab. Here is what you need to know.
| Option | Capacity | Cost | Best For | Watch Out |
|---|---|---|---|---|
| Full truck (standard) | 10 yd³ | $1,500 – $1,750 | Most 30x30 pours | Need a second partial load for 6"+ |
| Full truck + short load | 10 + 2 yd | $1,500 + $300 | Thick slabs (6"+) | Timing between trucks critical |
| Volumetric mixer | Unlimited (on-demand) | $2,000 – $3,000 | Complex pours, remote sites | Higher per-yard cost |
| Two full trucks | 20 yd³ | $3,000 – $3,500 | Overkill for 30x30 | Waste if not all used |
Can a Concrete Truck Drive on a 30x30 Slab?
This is one of the most overlooked risks in concrete construction. A fully loaded concrete truck weighs approximately 66,000 pounds — 28,000 pounds on each rear axle (Structure Magazine). An empty truck weighs 27,000 pounds. Each additional cubic yard of concrete adds roughly 4,000 pounds.
| Slab Thickness | Max Truck Load % | Practical Limit | Risk Level |
|---|---|---|---|
| 4 inches | 25–35% | Partial unload only | High — full truck will crack slab |
| 6 inches | 60–80% | Mostly unloaded truck | Moderate — proceed with caution |
| 8 inches | 100% | Full truck OK | Low — standard for commercial |
What this means for your 30x30 project: If you are pouring a 4-inch slab, the concrete truck cannot drive onto the freshly poured surface. The truck must park adjacent to the pour site, and concrete must be moved via wheelbarrow, conveyor, or pump. For a 6-inch slab, the truck can partially unload but should not drive across the full slab. This is why a pump truck ($400–$800) is almost always necessary for a 30x30 pour — it eliminates the need for the truck to access the pour site directly.
30x30 Slab Cost by Region (2026)
Where you build significantly affects your 30x30 slab price. At 900 square feet, regional differences add up fast.
| Region | Cost Range (4-inch, installed) | Cost per Sq Ft | Key Factors |
|---|---|---|---|
| Southeast | $4,500 – $8,100 | $5 – $9 | Lowest labor rates, abundant materials |
| Midwest | $5,400 – $9,000 | $6 – $10 | Moderate labor, wide availability |
| Southwest | $5,850 – $9,900 | $6.50 – $11 | Higher transport costs, extreme heat |
| Northeast | $7,200 – $12,600 | $8 – $14 | Highest labor rates, strict permits |
| West Coast | $6,300 – $10,800 | $7 – $12 | Material shortages, labor shortages |
What the data says: A 30x30 slab in the Southeast costs roughly 30–40% less than the same slab in the Northeast. At 900 square feet, that difference is $2,700–$4,500. Metro areas consistently cost more than rural locations due to higher labor rates and delivery logistics. According to CostFlowAI, the West Coast has the highest material costs ($150–$200/yd³) while the Southeast has the lowest ($120–$150/yd³). HomeAdvisor's state-level data shows Texas at $5.31–$5.90/sqft versus California at $7.67–$8.53/sqft — a 40% difference on a 900 sqft slab.
Common Uses for a 30x30 Concrete Slab
At 900 square feet, a 30x30 slab is the foundation for serious structures. Here are the most common applications and what each requires.
| Use | Recommended Thickness | Reinforcement | Installed Cost | Special Considerations |
|---|---|---|---|---|
| Two-car garage | 6 inches | #4 rebar, 18" grid | $9,000 – $15,000 | Anchor bolts for walls, slope for drainage |
| Workshop | 6 inches | #4 rebar, 18" grid | $9,000 – $15,000 | Electrical conduit conduits, floor drains |
| RV parking pad | 6–8 inches | #4 rebar, 12" grid | $9,000 – $20,000 | Extra thickness for heavy RV loads |
| Large patio | 4 inches | Wire mesh | $5,400 – $10,800 | Decorative finish optional |
| ADU foundation | 6–8 inches | #4 rebar, 12" grid | $9,000 – $20,000 | Engineering plans required, inspections |
| Small commercial | 6–8 inches | #4 rebar, 12" grid | $9,000 – $20,000 | Commercial permits, ADA compliance |
Project Timeline: 30x30 Slab
A typical 30x30 residential slab takes 5–10 days from site prep to walkable surface. Plan for a full day of pouring.
Excavate to required depth (typically 10–14 inches to allow for gravel base + slab thickness). Level the area, compact the subgrade with a plate compactor, and install wooden or steel forms. Set reinforcement on chairs so it sits in the middle of the slab thickness. For a 30x30 slab, you will need 200+ linear feet of forming material.
Concrete truck(s) arrive. Pour into forms, spread with a rake, screed to level with a power screed, bull float to smooth, and apply finish. Use a power trowel for the main surface — hand finishing 900 square feet is not possible before the concrete sets. Edge the perimeter and cut control joints every 10 feet in both directions — creating a grid of 3×3 sections (9 sections total) to prevent random cracking.
Keep the slab moist for 7 days. Cover with plastic sheeting, wet burlap, or apply curing compound. Walkable after 24–48 hours. Light use after 7 days. Full strength at 28 days. Do not seal until after 28 days. For a 30x30 slab, curing is critical — the larger mass generates more heat, and rapid drying causes surface cracks.
Cost Breakdown by Component: 30x30 Slab
Here is exactly where every dollar goes in a professionally installed 30x30 concrete slab (4-inch, broom finish).
| Component | Low | High | % of Total | What You Get |
|---|---|---|---|---|
| Ready-mix concrete | $1,390 | $2,110 | 15–20% | 11.11 cubic yards, 3,000 PSI at $125–$190/yd |
| Short-load fee | $0 | $110 | 0–1% | Often waived at 10+ yards |
| Delivery | $0 | $100 | 0–1% | Distance-based |
| Reinforcement | $315 | $1,860 | 5–15% | Wire mesh ($315) or rebar ($1,050–$1,860) |
| Site preparation | $400 | $1,200 | 5–10% | Grading, excavation, gravel base |
| Pump truck | $400 | $800 | 5–8% | Concrete pumping to pour site |
| Labor | $2,400 | $5,600 | 40–55% | Forming, pouring, finishing, cleanup |
| Power trowel rental | $150 | $300 | 1–3% | Essential for 900 sqft finish |
| Sealer | $180 | $450 | 2–4% | Protective coating |
| TOTAL | $5,400 | $10,800 | 100% |
What the data says: For a basic 30x30 garage pad, concrete material makes up 15–20% of the cost, labor is 40–55%, and equipment (pump, trowel) is 5–10%. According to Estimators.us, materials account for 40–50% and labor for 45–55% of every installed price. The BLS reports the national mean wage for cement masons and concrete finishers at $28.87/hr ($60,050/yr) as of 2025. Labor is the biggest line item — which is why professional installation is essential at this scale, but also why getting multiple quotes saves significant money. Bids for identical scopes can vary 40% by region due to labor market differences (Estimators.us).
Hidden Costs for a 30x30 Slab
Based on contractor data and homeowner reports, here are the costs that catch people off guard on a 30x30 slab project:
| Hidden Cost | Typical Range | When It Applies | How to Avoid |
|---|---|---|---|
| Concrete pump | $400 – $800 | Truck cannot reach pour site | Ensure truck access within 20 feet |
| Power trowel rental | $150 – $300/day | Always for 900 sqft | Included in most contractor bids |
| Short-load fee | $50 – $110 | Ordering under 10 cubic yards | Order 11+ yards to fill one truck |
| Old slab removal | $1,800 – $4,500 | Replacing existing concrete | DIY demolition to save $800–$2,000 |
| Permits | $100 – $1,500 | Almost always required at 900 sqft | Check local codes before starting |
| Engineering plans | $500 – $2,000 | Garage, commercial, or structural use | Required for permits in most areas |
| Excavation/grading | $800 – $2,400 | Sloped or uneven ground | DIY site prep if possible |
| Control joint cutting | $300 – $800 | Saw-cutting joints after pour | Include in initial contract |
| Wait time | $75 – $150/hr | Delay between delivery and pour | Have crew ready before truck arrives |
| Cold weather protection | $400 – $1,200 | Pouring below 40°F | Use heated blankets or wait for spring |
30x30 vs 20x20: Cost Comparison
Not sure if you need a 30x30 or can get by with a 20x20? Here is the honest comparison.
| Factor | 20x20 (400 sqft) | 30x30 (900 sqft) | Difference |
|---|---|---|---|
| Concrete volume (4") | 4.93 yd³ | 11.11 yd³ | +6.18 yd³ (+125%) |
| Installed cost | $2,400 – $4,800 | $5,400 – $10,800 | +$3,000 – $6,000 |
| DIY feasible? | Upper limit | No | Professional required |
| Pump truck needed? | Rarely | Almost always | +$400 – $800 |
| Power trowel needed? | Optional | Essential | +$150 – $300 |
| Crew size | 4–6 people | 6–8 people | +2 people |
| Pour time | 6–8 hours | 8–12 hours | +2–4 hours |
| Common uses | Patios, shed pads | Garages, workshops, RV pads | Different scale projects |
Bottom line: A 30x30 slab costs 2–2.5× more than a 20x20 but provides 2.25× the area. The per-square-foot cost is roughly the same ($6–$12/sqft), but the absolute dollar difference is $3,000–$6,000. Only go 30x30 if you genuinely need 900 square feet — a garage, workshop, or commercial foundation. For a patio or shed pad, 20x20 is usually sufficient.
Cost Saving Tips for Your 30x30 Slab
At $5,400–$10,800, a 30x30 slab is a significant investment. Here are proven ways to reduce costs without cutting corners:
- Prepare the site yourself. Excavation, grading, and gravel base installation are labor-intensive but do not require skilled trade work. DIY this step and save $800–$2,400 on a 30x30 slab.
- Choose broom finish. A basic broom finish costs $0 extra. Stamped or colored finishes can add $4,500–$10,800 to a 30x30 slab. If budget is tight, upgrade later with concrete stain.
- Use wire mesh for patios, rebar for garages. Match reinforcement to actual use. Wire mesh ($315–$630) is sufficient for foot-traffic patios. Upgrade to rebar ($1,050–$1,400) only for vehicle traffic.
- Avoid short-load fees. At 11.11 cubic yards, order 11.5 yards to fill one truck. Most plants waive the short-load fee at 10+ yards. Ask your supplier.
- Get 3 itemized quotes. Prices vary 30–50% between contractors. Get detailed written quotes with the same specs for fair comparison.
- DIY the site prep, hire for the pour. The most cost-effective hybrid approach: excavate and form yourself, hire a crew for the pour and finish. Saves $1,500–$3,000.
- Coordinate with a neighbor. If a neighbor also needs concrete work, combine orders to fill a larger truck and split delivery costs.
- Pour in the off-season. Contractors are less busy in late fall and early spring. Some offer 5–15% discounts during slow periods.
Frequently Asked Questions
How much concrete do I need for a 30×30 slab?
A 30×30 slab at 4 inches thick requires 11.11 cubic yards of concrete. This equals 500 bags of 80-pound concrete mix or 667 bags of 60-pound mix. With a 10% waste factor, order 550 bags of 80lb or 734 bags of 60lb. At 5 inches thick, you need 13.89 cubic yards. At 6 inches thick, you need 16.67 cubic yards.
How much does a 30×30 concrete slab cost?
A 30×30 concrete slab costs $5,400 to $10,800 for a standard 4-inch residential pour with broom finish and wire mesh reinforcement in 2026. At 6 inches with rebar, the range extends to $9,000–$15,000. The 30x30 size is too large for DIY — professional installation is required.
How many bags of concrete for a 30×30 slab?
A 30×30 slab at 4 inches thick requires 500 bags of 80-pound concrete mix or 667 bags of 60-pound mix. Always add 10% extra for waste: 550 bags of 80lb or 734 bags of 60lb. For a 30x30 slab, ready-mix delivery is strongly recommended — bagged concrete is impractical at this volume.
How thick should a 30×30 garage slab be?
6 inches is the standard thickness for a 30×30 garage slab. This provides adequate strength for vehicle traffic, equipment storage, and structural loads. For heavy trucks, RVs, or commercial use, upgrade to 8 inches with #4 rebar at 12-inch spacing. A 4-inch slab is not recommended for garage use at this size.
How much does a 30×30 concrete slab weigh?
A 30×30 slab at 4 inches thick weighs approximately 45,000 pounds (22.5 tons). At 6 inches, it weighs approximately 67,500 pounds (33.75 tons). Concrete weighs 150 pounds per cubic foot. A 30x30x4" slab is 300 cubic feet × 150 lbs = 45,000 lbs.
Do I need a pump truck for a 30×30 slab?
Almost always yes. A 30×30 slab covers 900 square feet, and the concrete truck typically cannot reach all areas from a single position. A pump truck ($400–$800) ensures even distribution and reduces labor time. If the pour site is more than 20 feet from where the truck can park, a pump is essential.
Can I pour a 30×30 slab myself?
No. A 30×30 slab is NOT a DIY project. At 900 square feet, you need 11+ cubic yards of concrete, a crew of 6–8 people, a full day of work, and specialized equipment (power trowel, possibly a pump truck). Ready-mix concrete must be poured within 90 minutes of batching. Mistakes on a slab this size are extremely expensive to fix. Hire a professional contractor.
How long does a 30×30 slab take to pour?
A 30×30 slab takes 8–12 hours to pour and finish with a crew of 6–8 people. The concrete truck unloads in 60–120 minutes, and finishing takes 4–6 hours with a power trowel. Curing begins immediately and continues for 28 days. The slab is walkable after 24–48 hours and ready for light use after 7 days.
Do I need a permit for a 30×30 concrete slab?
Almost certainly yes. Most municipalities require a permit for slabs exceeding 120–200 square feet, and a 30×30 slab at 900 square feet far exceeds that threshold. Permit costs range from $100 to $1,500. Some areas also require engineering plans for slabs this size. Check with your local building department before starting.
What is the best reinforcement for a 30×30 slab?
For a 30×30 garage or workshop, use #4 rebar at 18-inch spacing in both directions. This creates a grid of approximately 20 bars running each way. For a patio or light-use slab, wire mesh is acceptable but rebar is recommended at this size. Fiber mesh can be added as supplemental crack protection but should not be the sole reinforcement on a 900 sqft slab.
How much does it cost to remove an old 30×30 concrete slab?
Removing an old 30×30 concrete slab costs $1,800–$4,500, depending on thickness and accessibility. At 900 square feet, this is a major demolition project requiring a jackhammer, skid steer, and dumpster. Professional removal includes hauling and disposal. DIY removal is possible but takes 3–5 days of heavy labor.
What can I build on a 30×30 concrete slab?
A 30×30 slab is ideal for a two-car garage, workshop, large shed, ADU (accessory dwelling unit) foundation, RV parking pad, or small commercial structure. At 900 square feet, it provides enough space for a fully functional workspace or living area. Ensure the slab thickness and reinforcement match the intended use.
Data Sources
- HomeGuide 2026 Concrete Slab Cost Guide — $5,400–$10,800 for 30×30, $6–$12/sqft
- HomeAdvisor 2026 Concrete Cost Report — $6/sqft national average
- Angi Contractor Pricing Survey 2026 — $4–$12/sqft range
- This Old House 2026 Concrete Slab Cost Guide — $3,600–$7,200 for 30×30, thickness pricing
- CostGuideHQ 2026 Concrete Slab Analysis — $4–$12/sqft, 6 sources cited
- LawnStarter 2026 Concrete Slab Pricing — $6.60/sqft average, finish costs
- National Ready Mixed Concrete Association (NRMCA) — $125–$175/yd³ pricing data
- Concrete Network — 2026 Concrete Pricing Guide — $125–$190/yd³
- Metal America Concrete Pricing Data 2026 — $4–$12/sqft
- CostFlowAI Concrete Slab Cost Analysis 2026 — $145–$185/yd³ ready-mix
- Structure Magazine — Concrete Truck Weight on Slabs — 66,000 lb loaded truck, thickness limits
- Kurlon 30×30 Cost Guide 2026 — $4,050–$9,000 detailed breakdown
- Nedeestimating 2026 Concrete Cost Guide — $6–$12/sqft, size chart
- Estimators.us 2026 Concrete Slab Guide — $6–$12/sqft, cost breakdown
- HowMuchConcrete.io — 30×30 Volume Calculator — 11.11 yd³ at 4", 499 bags
- American Cement Association Price Trends 2024–2026
- FRED (Bureau of Labor Statistics) Producer Price Index — Ready-Mix Concrete (April 2026)
- GTL Development Concrete Pricing Guide 2026 — $5,400–$10,800 for 30×30
- BossBuildings 30×30 Cost Guide — $5,400–$10,800 slab cost
Related Calculators & Tools
- Concrete Slab Cost Calculator — Get exact cubic yards, bag count, and cost for any slab size
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- Landscape Rock Calculator — Calculate gravel and rock for base preparation