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An example of bottom-up cost estimate using uploaded WBS and RBS WBS: A Work Breakdown Structure (WBS) is a hierarchical decomposition of the project into

An example of bottom-up cost estimate using uploaded WBS and RBS

WBS:

A Work Breakdown Structure (WBS) is a hierarchical decomposition of the project into smaller, more manageable work packages. Here's an example WBS for the construction of a single-family home in the suburbs:

1. Project Initiation

2. Site Preparation 2.1. Clear the Site 2.2. Level the Ground 2.3. Install Temporary Fencing 2.4. Set Up Temporary Utilities 2.5. Prepare Access Roads

3. Foundation 3.1. Excavate Foundation 3.2. Install Footings and Foundation Walls 3.3. Pour Concrete Slab 3.4. Install Drainage System

4. Framing 4.1. Install Wall and Roof Framing 4.2. Install Windows and Exterior Doors 4.3. Install Roof Sheathing and Underlayment 4.4. Install Siding and Exterior Trim

5. Electrical and Plumbing 5.1. Rough-In Electrical Wiring 5.2. Rough-In Plumbing 5.3. Install HVAC System

6. Insulation and Drywall 6.1. Install Insulation 6.2. Install Drywall

7. Interior Finishes 7.1. Install Interior Doors and Trim 7.2. Install Cabinets and Countertops 7.3. Install Flooring 7.4. Paint Interior Walls and Ceilings

8. Exterior Finishes 8.1. Install Exterior Doors 8.2. Install Landscaping 8.3. Install Driveway and Walkways

9. Final Inspection and Cleanup 9.1. Final Inspection and Testing 9.2. Clean Up Job Site 9.3. Move In and Handover

The home configuration will include 3 bedrooms, 2.5 bathrooms, and 2,500 square feet. The estimated time to complete the work is 12 months, and the estimated cost is $400,000.

To find the critical path, we need to identify the sequence of activities that must be completed on time in order to complete the projecton schedule. In this case, the critical path is: Site Preparation Foundation Framing Electrical and Plumbing Insulation and Drywall Interior Finishes Exterior Finishes Final Inspection and Cleanup

RBS

1.0 Personnel
1.1 Management
1.1.1 Project Manager hour $66.00
1.1.2 Project Engineer hour $48.00
1.2 Design
1.2.1 Architect hour $39.00
1.2.2 Civil Engineers hour $35.00
1.2.3 Interior Designer hour $24.00
1.2.4 LandscapeArchitect hour $47.00
1.3 Construction
Foreman hour $40.00
Plumber hour $30.00
Electrician hour $26.00
Construction Worker hour $19.00
Carpenter hour $29.00
Mason hour $24.00
Dry Waller hour $24.00
Painter hour $21.00
Roofer hour $18.00
Landscaper hour $31.00
2.0 Materials
2.1 Architectural
2.1.1 Lumber each $3.35
2.1.2

Paint

gallon $40.00
2.1.3 Drywall each $10.00
2.1.4 Concrete each $7.00
2.1.5 Insulation each $17.00
2.1.6 Windows each $125.00
2.1.7 Doors each $300.00
2.1.8 Flooring square foot $3.00
2.1.9 Roof Shingles each $40.00
2.1.10 Nails box $30.00
2.2 Plumbing
2.2.1 Pipes foot $8.00
2.2.2 Faucets each $80.00
2.2.3 Shower each $400.00
2.2.4 Bathtub each $450.00
2.2.5 Sink each $300.00
2.2.6 Toilet each $125.00
2.3 Electrical
2.3.1 Wire foot $4.00
2.3.2 Switches each $3.00
2.3.3 Outlets each $2.00
2.3.4 Light Fixtures each $200.00
2.3.5 Junction Box each $230.00
2.4 Landscape
2.4.1 Sod square foot $1.16
2.4.2 Soil cubic foot $5.30
2.4.3 Plants each $20.00
2.4.4 Pipes for irrigation system foot $.90
2.4.5 Sprinkler Heads each $4.00
2.4.6 Irrigation system control each $150.00
24.7 Irrigation system valve each $30.00
2.5 Environmental
2.5.1 HVAC system each $4000.00

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