Durham Concrete Calculator
✓ 100% Free
Durham
Concrete Calculator — Yards, Bags & Cost
Calculate cubic yards, bags needed, and Durham NC-accurate ready-mix costs for any concrete project — driveways, patios, foundations, retaining walls, RTP commercial slabs, garage floors & more.
$138
Avg Durham Ready-Mix (per Cu Yd)
3,500
Min PSI — Durham Outdoor Flatwork
15 in
Frost Depth — Durham / Wake Co.
NCBC
North Carolina Building Code
🚗 Driveway
🏡 Patio
🏗️ Foundation
🏢 RTP Commercial
🧱 Retaining Wall
🛤️ Sidewalk
The Durham Concrete Calculator helps homeowners, contractors, and builders in Durham, NC estimate cubic yards, bag count, and ready-mix costs for any concrete project across the Bull City and the broader Research Triangle. Durham pricing runs $128–$152/yd — close to the national average — with strong competition between multiple Triangle-area plants serving Durham, Chapel Hill, Cary, and Raleigh. Durham’s Piedmont red clay soils, mild winters with 10–20 annual freeze-thaw cycles, moderate frost depths of 12–18 in., and hot humid summers shape unique local concrete requirements. The city’s rapid growth — fueled by Duke University, Research Triangle Park, and booming residential development — means concrete projects ranging from residential driveways to large commercial slabs are among the most common construction activities in the region. Enter your dimensions for instant, Durham-accurate results.
🔵 Durham Concrete Calculator
🔵 Durham NC-Accurate Pricing · NCBC / IBC Compliant · Research Triangle
Durham Concrete Calculator
Cubic yards, bags needed & Durham ready-mix cost — instant results
🚗 Driveway
🏡 Patio
🏗️ Foundation
🏢 Commercial
🧱 Retaining Wall
Enter project dimensions to calculate volume, bags, and estimated Durham NC material cost.
Durham City and Durham County require building permits for all structural concrete. Contact Durham Inspections at (919) 560-4144 before starting any structural pour.
Patio 4 in · Driveway 4–5 in · Garage 4–5 in · Commercial slab 5–6 in · Foundation wall 8–10 in
Cubic Yards Required
—
Including waste factor
📋 Project Summary
💵 Durham Cost Estimate
📐 Durham Slab Cross-Section — NCBC Piedmont Clay Standard
Broom / Brushed Finish — Durham NC Standard
Concrete — 4–5 in. (NCBC Residential) / 5–6 in. (Commercial / RTP)
3,500 PSI · Air-Entrained Optional · W/C Ratio ≤ 0.50 · Wire Mesh or Rebar
⬛ Wire Mesh or Rebar — Driveways, Commercial RTP Slabs, Retaining Walls
🪨 4 in. Compacted Gravel / Crushed Stone Base (Durham Standard)
Compacted Subgrade — Durham Piedmont Red Clay / Weathered Granite (Well-Compacted Required)
27
Cu ft per cubic yard
45
80 lb bags per cu yd
$138
Avg Durham ready-mix / yd
Concrete Slab
Rebar / Mesh
Gravel Base
Red Clay Subgrade
Durham Concrete Calculator — What You Need to Know
Durham, NC sits in the heart of the Piedmont region — a transition zone between the Coastal Plain and the Blue Ridge Mountains — giving it a moderate climate with mild winters and hot, humid summers. Frost depths are shallow at just 12–18 in., and Durham experiences only 10–20 freeze-thaw cycles per year, making concrete less vulnerable to cold-weather attack than northern states. However, Durham’s famous Piedmont red clay soils pose the most significant local concrete challenge: clay expands when wet and contracts when dry, causing slab heaving, settlement, and cracking if subgrade preparation is neglected. A properly compacted 4 in. crushed stone base is non-negotiable for any flatwork in Durham. The city’s explosive growth — with major residential subdivisions, Duke University expansion projects, and Research Triangle Park (RTP) commercial developments — means concrete demand in Durham is among the highest in North Carolina.
🔵 Durham / North Carolina Building Code Minimum Concrete Requirements
Residential outdoor flatwork (Durham): 3,500 PSI minimum · Driveways and high-traffic slabs: 4,000 PSI recommended for long-term durability · RTP commercial / industrial slabs: 4,000–4,500 PSI, fiber-reinforced, engineered design for heavy equipment or rack loads · Footings: 12–18 in. below grade in Durham / Durham County (verify exact depth with Durham Inspections). Contact Durham County Inspections for permit requirements.
🚗 Durham Driveway
A standard 10×20 ft driveway at 4 in. needs ~2.5 cubic yards. At Durham pricing ($130–$148/yd for 3,500 PSI), material costs $325–$370. Durham driveways on red clay lots must have a compacted gravel base of at least 4 in. — without it, clay movement will crack the slab within 3–5 years. Seal the driveway after 28-day cure and reseal every 2–3 years to protect against Durham’s hot, UV-intense summers.
🏢 RTP Commercial Slab
Research Triangle Park is one of the largest and most active research and tech campuses in the US — commercial and industrial concrete slabs are a constant demand. A standard 50×100 ft RTP warehouse slab at 5 in. needs ~77 cubic yards. Specify 4,000–4,500 PSI fiber-reinforced with a vapor barrier under the slab. RTP tenant improvement projects often require engineered slab designs for rack storage loads exceeding 20,000 lbs/rack foot.
🏗️ Durham Foundation
Durham homes predominantly use crawl space foundations rather than full basements — the region’s clay soils and relatively mild frost depth make crawl spaces far more common than in northern states. A standard crawl space perimeter footing (100 linear ft × 16 in. wide × 10 in. deep) needs ~5.1 cubic yards. Durham County Inspections requires a permit and footing inspection before pouring any foundation, even on residential projects.
How to Calculate Concrete Volume — Durham NC
Multiply length × width × (depth in inches ÷ 12) to get cubic feet, then divide by 27 for cubic yards. For Durham crawl space footings, calculate the total linear feet of footing and multiply by width and depth. Always add a minimum 10% waste factor — Triangle-area short-load fees of $80–$140 for orders under 3–5 cubic yards apply at most local plants. On hot Durham summer days above 90°F, concrete sets fast — schedule pours before 8 AM in July and August to maintain workability and avoid premature stiffening during finishing.
📐 Durham Concrete Formula
Volume (cu ft) = Length (ft) × Width (ft) × [Depth (in) ÷ 12]
Volume (cu yd) = Volume (cu ft) ÷ 27
Order Qty = CEIL[ Volume (cu yd) × Waste Factor ]
Example: 20 ft × 10 ft Durham driveway × 4 in = 66.7 cu ft = 2.47 cu yd → Order 2.7 cu yd
⚠️ Durham Red Clay Subgrade Warning
Durham’s Piedmont red clay is one of the most challenging subgrade soils for concrete in the Southeast. Red clay (Cecil and Appling series soils) expands up to 10% when saturated and shrinks dramatically during dry summers — this seasonal movement will crack any slab poured directly on uncompacted or wet clay. Before any pour, excavate to undisturbed subgrade, proof-roll with a loaded dump truck to identify soft spots, compact to 95% Proctor density, and install a minimum 4 in. compacted crushed stone base. On sloped Durham lots — common throughout Hope Valley, Woodcroft, and Forest Hills — also install perimeter French drains to prevent water from migrating under the slab.
Durham Concrete Calculator — Pricing Reference
Durham ready-mix pricing is near the national average and benefits from strong Triangle-area plant competition. Vulcan Materials, Martin Marietta, Cemex, and several local independent plants operate in the Raleigh-Durham-Chapel Hill corridor, keeping prices competitive. Projects within Durham city limits may face additional delivery coordination around Durham’s busy roads and active construction zones near downtown and Duke University. Rural Durham County sites west of I-85 or north toward Roxboro can see $8–$15/yd in haul surcharges. Compare with the North Carolina Concrete Calculator and the Raleigh Concrete Calculator for nearby pricing.
| Mix Type / PSI | Durham Price / Cu Yd | National Avg | Best For | Air Entrained? | NCBC Code |
|---|---|---|---|---|---|
| 3,000 PSI — Standard | $120–$135 | $130–$150 | Interior slabs, protected crawl space floors | Optional | Interior Only |
| 3,500 PSI — Durham Standard | $128–$148 | $138–$158 | Driveways, patios, sidewalks, garage floors | Recommended | Compliant |
| 4,000 PSI — Enhanced | $136–$158 | $145–$165 | Heavy driveways, retaining walls, RTP slabs | Recommended | Compliant |
| 4,500 PSI — Commercial | $148–$170 | $155–$175 | RTP industrial slabs, heavy commercial | Required | Compliant |
| 5,000 PSI — Heavy Structural | $158–$182 | $163–$185 | Heavy industrial / structural commercial | Required | Compliant |
| Fiber / Stamped Decorative | $158–$210 | $155–$210 | Patios, pool decks, decorative Durham | Recommended | Compliant |
3,000 PSI — Standard
Durham Price / Cu Yd$120–$135
National Avg$130–$150
Best ForInterior / protected crawl space floors
3,500 PSI — Durham Standard
Durham Price / Cu Yd$128–$148
National Avg$138–$158
Best ForDriveways, patios, sidewalks, garages
4,000 PSI — Enhanced
Durham Price / Cu Yd$136–$158
National Avg$145–$165
Best ForHeavy driveways, retaining walls, RTP
4,500 PSI — Commercial
Durham Price / Cu Yd$148–$170
National Avg$155–$175
Best ForRTP industrial slabs, heavy commercial
5,000 PSI — Heavy Structural
Durham Price / Cu Yd$158–$182
National Avg$163–$185
Best ForHeavy industrial / structural commercial
Durham NC Concrete Project Tips
- Always address Durham’s red clay subgrade before pouring — This is the single most important step for any concrete project in Durham. Red clay swells and shrinks dramatically with moisture — never pour directly on clay. Excavate, proof-roll, compact to 95% Proctor, and install a minimum 4 in. compacted crushed stone base. On sloped lots common in Hope Valley and Forest Hills, add perimeter drainage to prevent water from undermining the slab.
- Pull a permit from Durham County Inspections for structural work — Durham City and Durham County require building permits for foundations, retaining walls over 4 ft, driveway aprons at public streets, and structural slabs. Call Durham Inspections at (919) 560-4144 or visit the Durham One Stop center at 101 City Hall Plaza. Unpermitted structural concrete can create title and insurance complications when you sell your home.
- Pour early morning in Durham summers — Durham regularly hits 95°F+ in July and August with high humidity. Hot weather accelerates concrete set time — sometimes to as little as 45 minutes in direct sun at 95°F. Schedule all large pours before 7–8 AM, specify a set retarder when temperatures exceed 85°F, and keep the drum turning continuously during delivery to prevent premature stiffening.
- Add control joints every 8–10 ft in all flatwork — Durham’s temperature range (25°F in January to 95°F in August) causes significant thermal expansion and contraction in concrete slabs. Tool or saw-cut control joints every 8–10 ft within 24 hours of placement on all driveways, patios, and sidewalks. Properly located joints direct cracking and keep slabs looking clean for decades.
- Use fiber reinforcement or wire mesh on all Durham slabs — Durham’s clay subgrade movement, even with a good gravel base, makes fiber reinforcement or 6×6 wire mesh a smart addition to all residential flatwork. Polypropylene fiber added at $5–$8/yd reduces plastic shrinkage cracking — especially valuable during Durham’s hot, breezy summer pour days.
- Seal driveways and patios against Durham UV and humidity — Durham’s intense summer sun (UV index 9–10 from May–September) degrades unsealed concrete surfaces faster than in northern states. Apply a penetrating silane-siloxane sealer after the 28-day cure and reapply every 2–3 years. For decorative stamped patios — popular in Durham’s Tuscaloosa-Lakewood and Woodcroft neighborhoods — use an acrylic wet-look sealer for both UV protection and color enhancement.
- Order 10% extra — Durham short-load fees apply — Most Triangle-area plants charge $80–$140 for orders under 3–5 cubic yards. Overordering by 10% is almost always cheaper than scheduling a second truck, especially on a hot Durham summer day when a 30-minute wait for a second delivery means working with stiffening concrete and the risk of a visible cold joint.
✅ Durham vs. Raleigh vs. Chapel Hill — Pricing Snapshot
Durham averages $128–$152/yd with strong Triangle-area plant competition from Vulcan Materials, Martin Marietta, and Cemex plants along US-70 and I-85. Raleigh is similar at $130–$155/yd with a slightly denser plant network. Chapel Hill / Carrboro runs $132–$155/yd with some premium for tight campus-area delivery logistics. Rural Durham County (northern Durham, Bahama, Rougemont) can see $10–$15/yd more in haul surcharges. For large RTP commercial pours, contact plants 48–72 hrs in advance to confirm truck availability and any I-40/I-540 corridor haul premiums.
Durham Concrete Calculator — Frequently Asked Questions
How much does concrete cost per yard in Durham NC?+
$128–$152 per cubic yard for standard ready-mix in Durham, NC. Durham city projects average $128–$148/yd. Rural Durham County runs $135–$155/yd with some haul surcharges. Short-load fees of $80–$140 apply for orders under 3–5 cubic yards at most Triangle-area plants. RTP commercial projects may see volume discounts for pours over 50 cubic yards.
What PSI concrete should I use in Durham NC?+
3,500 PSI for standard residential outdoor flatwork — driveways, patios, sidewalks, garage floors. 4,000 PSI for heavy driveways, retaining walls, and any slab subject to heavy vehicle traffic. 4,000–4,500 PSI fiber-reinforced for RTP commercial and industrial slabs. Interior protected crawl space floors and basement slabs may use 3,000 PSI.
How deep must footings be in Durham NC?+
12–18 inches below finished grade in Durham and Durham County — significantly shallower than northern states due to Durham’s mild winters and shallow frost depth. Durham County Inspections (919-560-4144) requires a footing inspection before concrete placement on all permitted foundation work. Confirm your exact footing depth with Durham Inspections before excavating.
Do I need a permit for concrete work in Durham NC?+
Yes for structural work. Durham County requires permits for foundations, structural retaining walls over 4 ft, driveway aprons at public streets, and structural slabs. Simple residential patios and walkways on private property typically don’t require a permit. Contact Durham County Inspections at (919) 560-4144 or visit durhaminspections.com to verify your specific project requirements before starting work.
How do I deal with Durham’s red clay soil for a concrete slab?+
Excavate to undisturbed subgrade, proof-roll with a loaded dump truck to identify soft spots, and compact to 95% Proctor density. Install a minimum 4 in. compacted crushed stone base over the clay before pouring. On sloped Durham lots, add perimeter French drains to prevent water from migrating under the slab. Never pour directly on wet, soft, or uncompacted red clay — clay movement is the #1 cause of concrete slab failure in Durham.
Who supplies ready-mix concrete in Durham NC?+
Major Durham and Triangle-area suppliers include Vulcan Materials, Martin Marietta, Cemex, Capital Concrete, and Triangle Ready Mix, with multiple plants along US-70, I-85, and the I-40 corridor serving Durham, Raleigh, Chapel Hill, and RTP. Most plants offer same-day service for residential orders under 10 yards. For large commercial RTP pours (50+ yards), coordinate 48–72 hrs in advance to ensure truck availability.
How long does concrete cure in Durham NC?+
24 hrs foot traffic · 7 days light vehicles · 28 days full design strength. In Durham summers above 85°F, apply a curing compound or wet burlap immediately after finishing and maintain moisture for 7 days to prevent surface crazing — hot, sunny Durham days dry the surface faster than most homeowners expect. In rare Durham cold snaps below 40°F, cover with insulated blankets and delay finishing until temperatures recover.
Related NC & Triangle Concrete Calculators
Raleigh Concrete Calculator
Cubic yards, bags & Raleigh NC cost
Charlotte Concrete Calculator
Cubic yards, bags & Charlotte NC cost
Greensboro Concrete Calculator
Cubic yards, bags & Greensboro NC cost
North Carolina Concrete Calculator
Statewide NC cubic yards & cost
Official Durham Concrete Resources
Durham Inspections, NCDOT, and industry references for compliant concrete work across the Bull City.
🏛️
Durham County Inspections Department
Durham Building Permits
Apply for Durham building permits, schedule footing and slab inspections, verify contractor licensing, and access North Carolina Building Code (NCBC) requirements for all residential and commercial concrete work in Durham city and Durham County — including foundations, retaining walls, driveways, and RTP commercial slabs.
NC Department of Transportation — Division 5
NCDOT Concrete Standards
Access NCDOT Division 5 (Durham / Triangle area) driveway access permit applications, standard specifications for concrete construction on NCDOT right-of-way, road-adjacent project requirements, and contact information for driveway permits on NC-54, US-70, I-85, and other state-maintained roads bordering Durham properties.
National Ready Mixed Concrete Assoc.
Industry Resource
Find NRMCA-certified ready-mix producers in the Durham and Triangle area, access ACI 318 hot-weather concrete guides for Durham’s summer conditions, Piedmont clay subgrade preparation resources, mix design recommendations for NC’s humid subtropical climate, and decorative concrete specifications for Durham residential and commercial projects.