Construction Estimator Pro

完整的施工估算和成本管理系统。在准备项目估算、投标建议、成本明细、价值工程、变更单管理或施工预算跟踪时使用。涵盖住宅、商业和基础设施项目。触发“估算”、“施工成本”、“出价”、“起飞”、“成本细目”、“更改订单”、“价值工程”、“施工预算”、“单位定价”、“RSMeans”。

## 概述（中文）

完整的施工估算和成本管理系统。在准备项目估算、投标建议、成本明细、价值工程、变更单管理或施工预算跟踪时使用。涵盖住宅、商业和基础设施项目。触发“估算”、“施工成本”、“出价”、“起飞”、“成本细目”、“更改订单”、“价值工程”、“施工预算”、“单位定价”、“RSMeans”。

## 原文

# Construction Estimator Pro

> Complete construction estimating methodology — from quantity takeoff to bid submission. Zero dependencies.

---

## Phase 1: Project Classification & Estimate Type

### Estimate Type Decision Matrix

| Project Stage | Estimate Type | Accuracy | Basis | Use Case |
|---|---|---|---|---|
| Concept | Order of Magnitude | -30% to +50% | SF/unit costs | Go/no-go decisions |
| Schematic | Conceptual/Budget | -15% to +30% | Assembly costs | Budget approval |
| Design Dev | Detailed | -10% to +15% | Quantity takeoff | GMP/bid preparation |
| Construction Docs | Definitive/Bid | -5% to +10% | Full QTO + subs | Lump sum bid |
| Construction | Control | Actual costs | Committed + forecast | Cost management |

### Project Brief YAML

```yaml
project:
  name: ""
  number: ""
  type: residential | commercial | industrial | infrastructure | renovation
  delivery: design-bid-build | design-build | CM-at-risk | IPD
  location:
    city: ""
    state: ""
    zip: ""
    location_factor: 1.00  # RSMeans city cost index / national average
  owner: ""
  architect: ""
  
scope:
  gross_sf: 0
  stories: 0
  site_acres: 0
  description: ""
  
schedule:
  bid_date: ""
  construction_start: ""
  substantial_completion: ""
  duration_months: 0
  
estimate:
  type: order-of-magnitude | conceptual | detailed | definitive
  base_date: ""  # Date costs are based on
  escalation_rate: 0.04  # Annual construction cost escalation
  
assumptions:
  - ""
exclusions:
  - ""
allowances:
  - item: ""
    amount: 0
```

### Project Type Quick Reference

| Type | Key Considerations | Typical $/SF Range (2024-2026) |
|---|---|---|
| Single Family Residential | Foundation type, finishes grade, energy code | $150-$400/SF |
| Multi-Family | Unit mix, parking ratio, amenities | $200-$450/SF |
| Office (Class A) | Curtain wall, MEP density, TI allowance | $250-$550/SF |
| Retail | Shell vs TI, storefront, grease traps | $150-$350/SF |
| Healthcare/Hospital | Life safety, med gas, shielding | $400-$900/SF |
| K-12 Education | Prevailing wage, hazmat, phasing | $300-$600/SF |
| Warehouse/Distribution | Clear height, slab flatness, dock count | $80-$180/SF |
| Hotel | Star rating drives finish, FF&E budget | $200-$500/SF |
| Infrastructure (road/mile) | Soil conditions, utilities, traffic control | $2M-$10M/mile |

---

## Phase 2: Quantity Takeoff (QTO)

### CSI MasterFormat Division Structure

Use CSI MasterFormat 2018 for ALL estimates. Every line item maps to a division.

| Division | Name | Typical % of Total |
|---|---|---|
| 01 | General Requirements | 8-12% |
| 02 | Existing Conditions | 1-5% |
| 03 | Concrete | 8-15% |
| 04 | Masonry | 2-6% |
| 05 | Metals (Structural Steel) | 8-15% |
| 06 | Wood, Plastics, Composites | 3-8% |
| 07 | Thermal & Moisture Protection | 4-8% |
| 08 | Openings (Doors/Windows) | 3-7% |
| 09 | Finishes | 8-15% |
| 10 | Specialties | 1-3% |
| 11 | Equipment | 1-5% |
| 12 | Furnishings | 1-5% |
| 13 | Special Construction | 0-3% |
| 14 | Conveying Equipment (Elevators) | 1-4% |
| 21 | Fire Suppression | 2-4% |
| 22 | Plumbing | 4-8% |
| 23 | HVAC | 8-15% |
| 26 | Electrical | 8-15% |
| 27 | Communications | 1-3% |
| 28 | Electronic Safety & Security | 1-3% |
| 31 | Earthwork | 3-8% |
| 32 | Exterior Improvements | 2-6% |
| 33 | Utilities | 2-5% |

### QTO Best Practices

1. **Measure twice, price once** — QTO errors cascade through the entire estimate
2. **Use consistent units** — SF for areas, LF for linear, CY for volume, EA for items
3. **Add waste factors by material:**
   - Concrete: 5-8%
   - Masonry: 3-5%
   - Drywall: 10-12%
   - Roofing: 8-10%
   - Flooring (tile): 10-15%
   - Lumber: 8-10%
   - Rebar: 5-7%
   - Paint: 10-15%
4. **Document measurement methodology** — so anyone can verify
5. **Cross-check totals** — SF of drywall ≈ 2.5-3x floor area (both sides of walls + ceilings)

### QTO Line Item Template

```yaml
line_item:
  division: "03"
  spec_section: "03 30 00"
  description: "Cast-in-Place Concrete - Elevated Slabs"
  quantity: 450
  unit: CY
  unit_cost:
    labor: 85.00
    material: 165.00
    equipment: 25.00
    subcontractor: 0.00
  total_unit_cost: 275.00
  extended_cost: 123750.00
  waste_factor: 0.07
  adjusted_quantity: 481.5
  notes: "4500 PSI, #5 rebar @ 12\" OC EW, 6\" slab"
  source: "Sub quote - ABC Concrete (02/15/2026)"
  confidence: high | medium | low
```

### Quantity Verification Cross-Checks

| Check | Formula | Flag If |
|---|---|---|
| Concrete per SF | Total CY ÷ Building SF | >0.15 CY/SF (unless heavy structure) |
| Steel per SF | Total tons ÷ Building SF | >15 PSF (unless high-rise) |
| Drywall SF | Total drywall SF ÷ Floor SF | <2.0 or >4.0 ratio |
| Electrical per SF | Electrical $ ÷ Building SF | >$35/SF (standard office) |
| Plumbing fixtures | Count vs occupancy | Missing fixtures for code compliance |
| Parking spaces | Per local code requirements | Below minimum ratio |

---

## Phase 3: Pricing & Cost Assembly

### Unit Cost Development

**Cost source hierarchy (most reliable first):**
1. **Subcontractor quotes** (3 minimum per trade) — best for bid estimates
2. **Historical project data** — adjusted for location, time, scope
3. **RSMeans/Gordian data** — industry standard reference
4. **Vendor quotes** — for specific materials/equipment
5. **Published cost guides** — Marshall & Swift, Craftsman

### Labor Cost Build-Up

```yaml
labor_rate_build_up:
  trade: "Carpenter"
  base_wage: 42.50
  fringe_benefits: 18.75   # Health, pension, vacation, training
  payroll_taxes: 8.90      # FICA, FUTA, SUTA, workers comp
  total_burden: 27.65
  burdened_rate: 70.15
  
  productivity_factors:
    weather: 1.00           # 1.0 = normal, 1.15 = winter
    overtime: 1.00          # 1.0 = straight time, 1.5 = OT
    height: 1.00            # 1.0 = ground, 1.10 = >30ft
    congestion: 1.00        # 1.0 = open, 1.15 = tight
    shift: 1.00             # 1.0 = day, 1.10 = swing, 1.15 = night
  adjusted_rate: 70.15
```

### Subcontractor Quote Evaluation

Score each sub quote (use minimum 3 per trade):

| Factor | Weight | 1-5 Score |
|---|---|---|
| Price competitiveness | 30% | |
| Scope completeness (covers all spec sections?) | 25% | |
| Qualifications/exclusions (red flags?) | 20% | |
| Past performance/reputation | 15% | |
| Bond capacity/insurance | 10% | |
| **Weighted Total** | 100% | |

**Red flags in sub quotes:**
- "As needed" or "TBD" line items (scope gap)
- Short validity period (<30 days)
- Unusual exclusions (e.g., electrician excluding wire)
- No reference to spec sections
- Price significantly below others (they missed something)

### Crew Rate Assembly

```
Crew Daily Cost = Σ(Workers × Daily Rate) + Equipment Daily Cost
Crew Daily Output = Units per 8-hour day (from labor standards)
Unit Cost = Crew Daily Cost ÷ Crew Daily Output
```

**Example — Concrete Placement Crew:**
- 1 Foreman @ $75/hr × 8 = $600
- 4 Laborers @ $55/hr × 8 = $1,760
- 1 Vibrator operator @ $60/hr × 8 = $480
- Concrete pump (daily rental) = $1,200
- **Crew Daily Cost = $4,040**
- Daily output: 50 CY
- **Unit Labor+Equipment Cost = $80.80/CY**
- Material (concrete delivered) = $165/CY
- **Total in-place cost = $245.80/CY**

---

## Phase 4: Indirect Costs & Markups

### General Conditions (Division 01) Checklist

| Item | Duration-Based? | Typical Range |
|---|---|---|
| Project Manager | Yes | $12K-$18K/month |
| Superintendent | Yes | $10K-$16K/month |
| Project Engineer | Yes | $8K-$12K/month |
| Field Office (trailer) | Yes | $1K-$3K/month |
| Temporary utilities | Yes | $2K-$5K/month |
| Temporary toilets | Yes | $200-$500/month each |
| Dumpsters/waste removal | Yes | $1K-$4K/month |
| Safety equipment/supplies | Yes | $500-$2K/month |
| Small tools & consumables | Lump | 1-2% of labor |
| Final cleaning | Lump | $0.15-$0.50/SF |
| Permits (buildi