How We Price Projects: Transparent Estimating Explained

No Surprises: How We Build Every Estimate

Getting a contractor estimate can feel like a black box. A number appears on paper, and you are expected to trust it. What does it include? What is left out? Why is one bid $4,000 and another $8,000 for what seems like the same work?

At Cojo, we believe the estimate itself tells you a lot about the contractor. Vague estimates lead to surprise costs. Detailed, transparent estimates lead to trust and a project that matches expectations.

This guide shows you exactly how we build our estimates, what each line item means, and how to compare quotes from different contractors.

Our Estimating Process

Step 1: Site Assessment

Every estimate starts with an on-site visit. We do not price projects from photos or descriptions alone because what is beneath the surface matters as much as what is visible.

During the site assessment, we evaluate:

• Existing surface condition: Type, thickness, age, and damage level
• Subgrade and soil type: Clay, silt, sand, or rock — this determines base requirements
• Drainage patterns: Where water flows, where it pools, and where it needs to go
• Access and logistics: Equipment access, material staging, proximity to utilities and structures
• Grading and elevation: Current slopes, desired grades, transitions to adjacent surfaces
• Scope boundaries: Exactly what is included and where the work starts and stops

We measure everything — areas, lengths, depths, slopes. These measurements drive the material calculations that follow.

Step 2: Material Calculation

From the site measurements, we calculate exact material quantities:

• Demolition volume: Square feet of removal, tons of material to haul
• Excavation volume: Cubic yards of soil to remove, depth required
• Aggregate base: Tons of crushed rock needed at the specified depth
• Concrete or asphalt: Cubic yards of concrete or tons of asphalt, calculated from area and thickness
• Ancillary materials: Geotextile fabric, rebar, wire mesh, joint sealant, form lumber, curing compound

We add a standard material contingency (typically 5-10%) to account for normal waste, over-excavation, and minor field adjustments. This is listed explicitly on the estimate.

Step 3: Labor Estimation

Labor is estimated based on the scope:

• Crew size and duration: How many workers for how many days
• Equipment: What equipment is needed and for how long (excavators, loaders, concrete trucks, rollers, etc.)
• Complexity factors: Tight access, steep grades, decorative finishes, and other conditions that affect productivity

Step 4: Itemized Estimate

Everything comes together in a line-by-line estimate. Here is what a typical residential driveway estimate looks like:

Anatomy of a Cojo Estimate

Section 1: Demolition and Removal

| Item | Description | Quantity | Unit Cost | Total | |---|---|---|---|---| | Demo existing concrete | Saw-cut, break, load | 650 sq ft | $2.50/sq ft | $1,625 | | Haul and dispose | Truck, dump fees | 12 tons | $45/ton | $540 | | Subtotal | | | | $2,165 |

This section covers removing what is there now. The unit cost includes labor, equipment, and disposal. Some contractors quote this as a lump sum — we itemize it so you see the quantity and rate.

Section 2: Excavation and Base Preparation

| Item | Description | Quantity | Unit Cost | Total | |---|---|---|---|---| | Excavate subgrade | Remove soil to design depth | 20 cu yd | $35/cu yd | $700 | | Geotextile fabric | Non-woven separation fabric | 750 sq ft | $0.50/sq ft | $375 | | Aggregate base (3/4-minus) | Delivered, placed, compacted in lifts | 28 tons | $32/ton | $896 | | Fine grading | Laser-grade to design slope | 650 sq ft | $0.75/sq ft | $488 | | Subtotal | | | | $2,459 |

This is often the section where cheap bids cut corners. Less base depth, no geotextile, minimal compaction — all reduce cost today and cause failure in 5-10 years. We specify the depth, material, and method because these determine how long your driveway lasts.

Section 3: Concrete Work

| Item | Description | Quantity | Unit Cost | Total | |---|---|---|---|---| | Forms and reinforcement | Lumber, stakes, wire mesh | 650 sq ft | $1.25/sq ft | $813 | | Concrete (4,000 PSI, air-entrained) | Ready-mix delivered | 8.5 cu yd | $185/cu yd | $1,573 | | Placement and finishing | Pour, screed, float, broom | 650 sq ft | $3.00/sq ft | $1,950 | | Control joints | Saw-cut at 10-foot spacing | 120 lin ft | $2.00/lin ft | $240 | | Curing compound | Spray-applied membrane | 650 sq ft | $0.30/sq ft | $195 | | Subtotal | | | | $4,771 |

Note the concrete specification: 4,000 PSI and air-entrained. These are not optional upgrades in Oregon — they are minimum requirements for a driveway that handles our climate. If an estimate does not specify concrete strength and air content, ask.

Section 4: Finishing and Cleanup

| Item | Description | Quantity | Unit Cost | Total | |---|---|---|---|---| | Backfill and grade edges | Topsoil along driveway edges | Included | — | $250 | | Site cleanup | Remove forms, sweep, debris removal | Included | — | $150 | | Subtotal | | | | $400 |

Section 5: Project Summary

| | | |---|---| | Demolition and removal | $2,165 | | Excavation and base | $2,459 | | Concrete work | $4,771 | | Finishing and cleanup | $400 | | Material contingency (5%) | $490 | | Project Total | $10,285 | | Cost per square foot | $15.82/sq ft |

Every number is traceable to a quantity and rate. Nothing is hidden in a lump sum.

How to Compare Contractor Estimates

When you have multiple estimates for the same project, compare these specific items:

1. Base Depth and Material

The single most important factor in pavement longevity. Compare:

• How many inches of aggregate base?
• What type of aggregate?
• Is compaction testing included?
• Is geotextile fabric included on clay soil?

If one bid specifies 8 inches of compacted aggregate and another just says "base preparation — included," the second bid may be planning on 4 inches or less.

2. Concrete/Asphalt Specification

• What thickness?
• What PSI strength?
• Is air entrainment specified (for concrete)?
• What mix design (for asphalt)?

3. Scope Inclusions

Does the estimate include:

• Demolition and removal of existing surface?
• Hauling and disposal fees?
• Grading and drainage corrections?
• Control joints or saw cutting?
• Curing compound or sealing?
• Edge backfill and cleanup?

Items omitted from a low bid become change orders later.

4. Warranty and Guarantee

What does each contractor stand behind? Ask specifically:

• How long is the warranty?
• What does it cover? (Workmanship only? Materials? Base failure?)
• What is excluded?

5. Change Order Process

How does the contractor handle unexpected conditions? A reputable contractor explains this upfront. The answer should be: we stop, document, and get your approval before proceeding with any additional cost.

Why the Cheapest Bid Costs More

We see it regularly: a homeowner chooses the lowest bid, the driveway is installed, and within 3-5 years problems appear. The low bid saved $2,000-$3,000 upfront by:

• 4 inches of base instead of 8: Saves approximately $400-$600 in material. Costs $5,000-$8,000 in premature replacement.
• No geotextile on clay soil: Saves $200-$400. Leads to base contamination and failure within 10 years.
• 3 inches of concrete instead of 4: Saves $300-$500 in material. Results in structural cracking under normal use.
• No air entrainment: Saves $50-$100 per yard. Leads to surface scaling after the first freeze-thaw winter.

The math is simple: spending 80% of the proper cost gets you 40% of the proper lifespan. The cost per year of service is nearly double.

Our Pricing Philosophy

At Cojo, we price projects to last. That means:

1. Adequate materials. We do not reduce base depth, concrete thickness, or material quality to lower the number on the estimate.
2. Honest assessment. If your project needs something, we include it. If something is optional, we label it as such and let you decide.
3. No surprise costs. Our estimates include everything we know about. If we encounter something unexpected, we communicate before proceeding.
4. Fair margin. Our overhead and profit margin is built into the rates shown. It is not hidden in inflated quantities or vague line items.

We are not the cheapest option, and we are not the most expensive. We are the option that delivers the most value over the life of the project.

Next Steps

Read about our team and values to understand who you are working with. Browse our services to see the full range of work we do, or contact us for a free on-site estimate.

For cost benchmarks, our concrete driveway cost guide and asphalt paving cost guide provide current Oregon pricing for common projects.