Question
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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