Calculate cubic yards, bags needed, and Aurora-accurate ready-mix costs for driveways, slabs, foundations, patios & footings — Arapahoe County, Adams County, Denver Metro CO.
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Residential driveway: 5 in. min, 4,500 PSI, 6–7% air entrainment required. Rebar recommended over Aurora soils. 36 in. frost depth. ACI 306 Oct–Apr. City of Aurora Building Division permit + Contractor License required. Colorado DORA registration required.
Sidewalk 4 in · Driveway 5 in · Garage 5 in · Foundation wall 10 in+ · Footing 12 in+ at 36 in below grade
Aurora is Colorado's third-largest city and one of the most geologically diverse on the Front Range. The city spans Arapahoe, Adams, and Douglas Counties — each with distinct soil conditions. Northern Aurora sits on sandy loam and alluvial deposits from the South Platte River system; central and southern Aurora is dominated by Pierre Shale — a highly expansive marine shale that swells dramatically when wet and contracts severely in dry conditions, exerting enough force to heave and crack inadequately designed concrete structures within just a few years. Like all Denver metro cities, Aurora's 5,400-foot Front Range elevation produces 100–150 annual freeze-thaw cycles, making 6–7% air entrainment non-negotiable. Aurora averages 40 psf ground snow load per SEAC/CDOT data — requiring robust structural design on all covered and enclosed concrete elements.
Frost Depth: 36 inches — all structural footings must bear below this depth · Ground Snow Load: 40 psf (SEAC Aurora / Adams-Arapahoe County) · All exterior flatwork: 4,500 PSI min, 5 in. min, 6–7% air entrainment, W/C 0.45 max, rebar recommended · Foundation walls: 5,000 PSI, 10 in. min, rebar per CO structural spec · Oct–Apr: ACI 306 cold-weather mandatory · Pierre Shale sites: geotechnical investigation required before foundation design · All work: City of Aurora Building Division Contractor License + permit required. Colorado DORA registration required for all residential contractors.
Central and south Aurora sits atop Pierre Shale — a marine shale formation notorious across the Denver metro for extreme expansive behavior. Pierre Shale can swell 4–6 inches vertically when moisture content increases, exerting uplift pressures that buckle basement slabs, heave driveways, and crack foundation walls. Before any Aurora south-side foundation project, a licensed Colorado geotechnical engineer should drill test borings to identify shale depth and expansion potential. All flatwork over Pierre Shale sites must be on a minimum 6-inch CDOT Class 6 road base with positive drainage and rebar at 18-inch spacing both ways.
Aurora's frost depth of 36 inches matches the Denver metro standard and reflects the city's continental interior climate at 5,400-foot elevation. All continuous footings, isolated column footings, and foundation walls must have their bearing surface below 36 inches from finished grade — no exceptions. Unlike Arvada where the city has an officially published 36-inch figure, Aurora contractors should always confirm the current frost depth with the City of Aurora Building Division at 303.739.7420 before excavation, as adopted code editions can update climatic design values between permit cycles.
All contractors working in Aurora must obtain a City of Aurora Building Division Contractor License before any building permit can be issued. The license application fee is $136 and applies to all trades — residential building contractors, commercial building contractors, remodeling contractors, roofing contractors, and more. Contact Aurora Building Division at 303.739.7420 for licensing information. Electrical and plumbing contractors do not receive a separate Aurora license — they must supply their current state of Colorado Master's and Contractor's licenses for the city's records. Use the online Contractor Lookup tool at auroragov.org to verify any contractor's current license status before signing a contract.
Aurora is well-served by Denver metro ready-mix plants including Cemex, Martin Marietta, Colorado Ready Mix, and Western Mobile, with multiple plants in the Arapahoe and Adams County areas. All exterior mixes require air entrainment, adding $4–$8/yd above base pricing. Short-load fees of $105–$170 apply for orders under 3 cubic yards. Pump truck hire runs $425–$725 for backyard and elevated pours. Winter ACI 306 heated mix surcharge adds $12–$22/yd October through April. Fiber reinforcement is available for an additional $7–$12/yd.
| PSI Grade | Aurora Price / Cu Yd | Air Entrained | Best For | CO Code |
|---|---|---|---|---|
| 4,000 PSI | $148–$168 | Interior Only | Heated garage slabs, interior floors — not exterior | Interior Only |
| 4,500 PSI | $158–$180 | Required 6–7% | All exterior flatwork — Aurora CO minimum | CO Minimum |
| 5,000 PSI | $172–$196 | Required 6–7% | Foundations, footings, retaining walls, piers | Compliant |
| 5,500 PSI | $186–$212 | Required 6–7% | Heavy commercial, structural, tilt-wall | Compliant |
Aurora's Front Range location delivers cold-weather concrete conditions from mid-October through April — approximately 6 months of the year. Never pour onto frozen subgrade; Pierre Shale sites freeze particularly hard and can thaw unevenly, causing differential settlement under fresh concrete. Use heated mix water maintaining 55–65°F at delivery. Enclose fresh concrete with insulated curing blankets to maintain above 50°F for a minimum of 7 days. Aurora's South Plains location produces intense overnight temperature drops even after warm autumn days — always plan for the overnight low, not the daytime high. Monitor embedded temperature sensors on all foundation and structural pours throughout the curing period.
City of Aurora contractor licensing, building permits, Colorado DORA registration, and ACI 306 cold-weather standards for compliant Arapahoe & Adams County concrete work.
All contractors performing construction work in Aurora must hold a current City of Aurora Building Division Contractor License before any building permit can be issued. The license application fee is $136 and covers a range of trade categories including Residential Building Contractor, Commercial Building Contractor, and Remodeling Contractor. Contact Aurora Building Division at 303.739.7420 for licensing questions and permit applications. Verify any contractor's current Aurora license status using the Contractor Lookup tool at auroragov.org before signing any construction contract. Always confirm current general liability insurance and Colorado workers compensation coverage in writing from any contractor before work begins on your property.
Visit Aurora Contractor LicensingThe Colorado Department of Regulatory Agencies (DORA) administers contractor registration for all Colorado residential construction trades. All Aurora residential contractors must hold a current Colorado DORA registration in addition to their City of Aurora Contractor License. Verify any Aurora concrete contractor's DORA registration number, license class, current status, expiration date, and any complaint or enforcement history at colorado.gov/dora before signing any contract. Unregistered contractors in Colorado cannot legally obtain required permits, removing consumer protection rights under state residential contractor statutes. Always confirm current general liability ($1M minimum) and workers compensation insurance in writing before any Aurora concrete project begins.
Visit Colorado DORAACI 306 is the essential technical reference for every Aurora CO concrete contractor working October through April. It specifies heated enclosure requirements, mix water temperature targets of 55–65°F at delivery, aggregate pre-heating procedures, insulated curing blanket R-value requirements, embedded temperature sensor monitoring, and minimum concrete protection duration schedules based on section thickness and ambient temperature. Aurora's 36-inch frost depth, Pierre Shale expansive soil conditions, 100–150 annual freeze-thaw cycles, and hard overnight temperature drops in autumn and spring combine to create demanding cold-weather concreting conditions. ACI 306 violations are the leading cause of frozen Aurora concrete pours, early-age strength failures, and structural work rejections during Colorado's extended cold season from October through April.
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