House Construction Budget Plan Kihwan Lee 8/24/2018

Project Definition Objective: Plan: Reference: Prepare a high level budget plan for building a residential house. Plan: Obtain a national average for house construction Calculate house construction estimate from available data and compare to the national average Define required items. Address each items with rough estimates for each. Apply system engineering approach rather than detailed plan for each step. Construct a high level budget for building a house. Reference: Provide reference for each estimates

Budget Comparison on Single-Family Construction National Average Calculated Estimate National Average Estimate Square Footage 2470 Cost/ft2 $117 Carpenter $70/hr Masons Excavator Electrician $85/hr Painters $25~35/hr Plumber $45~65/hr Total Material $147k Total Labor $145k Machine Cost $5200 Total $295k Estimation Cost Note Land $0.0 Assuming the house is built on the currently owned land. Foundation $30k - Building $100k ~ $200k Conservative estimate used between a container house and a manufactured home. Water $21k Sewer Electricity $41k Margin/Hidden cost $50k Unknown and unaccounted for cost. Total $251k ~ $361k

House Construction Contract Process Project delivery method: Design-bid-build Procurement processes: RFP Contractor compensation structure: firm-fixed-price

Architect and General Contractor Provide the services and materials Hire subcontractors Suggest plans and ideas Deliver final cleanup Pull all the permits for work and utility installation Total compensation: $40k Architect Determine scope Draft a list of proposed work, budget, and outline Create the schematic design Finalize drawing and details Serve as the project manager and obtain necessary permit Serve in an advisory capacity Complete construction document and obtain building permit. Administer the construction Total compensation: $30k ~ 50k

Platform frame + Sheathing Roof: Solar panel roof from Tesla Hose Plan Frame-to-Foundation Roofing Wall framing sheathing and bracing Site-Built Home Plan Foundation: Concrete + Insulation Frame: Platform frame + Sheathing Roof: Solar panel roof from Tesla Floor framing and bridging Foundation Details of Foundation

Home Construction Project Item Detailed Breakdown Bath fixtures Foundations, Piers, Flatwork Rough Hardware Built in Appliances Garage Door Unit Heating and Cooling Cabinets Heating and Cooling Systems Windows Carpeting Insulation Wiring Countertops Insurance Kitchen Doors Interior Wall Finish Roofing Excavation Lighting Fixtures Paint Exterior Finish Painting Miscellaneous Exterior Trim Permits and Utilities Final Cleanup Plans and Specs Finish Carpentry Plumbing Fixtures Finish Hardware Plumbing Rough-in and Connection Fireplace and Chimney Roofing, Flashing, Fascia Flooring Rough Carpentry

Requirement Overview Land: use currently owned land Utilities Electricity: city or solar/wind Sewer: city or septic tank Water: city or well Construction Foundation: concrete Main structure: on-site building/manufactured home/container house Interior: kitchen/bathroom/bedroom/living room Electricity/sewer/gas/heater/air-conditioner:

Cost Estimate: Land Residential site Currently owned Charlotte County Address: 14380 Marlin ct, Placida Fl Cost: yearly tax < $1000.00 Total cost: close to or less than $1,000.00

Cost Estimate: Electricity Grid: If the city electric system is located close to the property, the cost is assumed less than $41,000.00 Solar Average house energy usage: 10kW Average solar system installation cost: $4.00 Expected cost: ~$40,000.00 Permit: $1000.00 Total cost: close to or less than $41,00.00

Cost Estimate: Sewer Grid: Septic: If the city septic system is located close to the property, the cost is assumed less than $21,000.00 Septic: Installation: $20,000.00 Permit: $1,000.00 Total cost: close to or less than $21,000.00

Cost Estimate: Water Grid Well If the city water system is located close to the property, the cost is assumed less than $21,000.00 Well Water testing: $500.00 Permit: $500.00 Drilling/pump/pipe/other equipment: $20,000.00 Total cost: $21,000.00

Cost Estimate: Foundation Expected cost for foundation: ~$30,000.00

Foundation Cost Breakdown Cost/ft2 Cost/project ft2 Material Slab $3 ~ $5 Footing $1 ~ $2 Labor $2 ~ $3 Leveling $1000 ~ 2000 Permit $1000 Size 2000 Total $23k National Average $10k ~ 16k

Cost Estimate: Manufactured Home vs. Site Built Home Double-wide Total area around 2,000 ft2 Expected cost ~ $100,000.00, including typical installation cost. Site-built home Expected cost $200,000.00

Cost Estimate: Container Home Main structure Four 10’ x 40’ container as the main building One 10’ x 20’ container as a car garage 4 x $5,000.00 + 1 x $3,000.00 = $23,000.00 Interior/plumbing/electricity $50,000.00 Site installation/preparation $30,000.00 Total cost of ~ $110,000.00

Summary Utility + Foundation cost ~ $103k. Main Building cost ~ $100k ~ $200k. Total cost: $203k ~ 303k + 20 ~ 30% cost uncertainty The total house construction cost becomes approximately $250k ~ 400k Key findings The site preparation cost is a significant portion of the entire project. Container house cost is comparable to the manufactured house cost. The site-built house cost about twice as much as either of the container house and manufactured house.

References Construction Technology, Lecture Notes https://www.fixr.com/costs/concrete-foundation https://www.thehomesdirect.com/blog/average-cost-of-a-manufactured-home https://www.honomobo.com/ https://www.containerhomeplans.org/2015/04/what-i-wish-id-known-before-building-my-shipping-container-home/ https://www.landcentury.com/articles-news/bringing-utilities-to-an-undeveloped-plot-of-land-what-to-expect https://www.manuelbuilders.com/blog/how-much-does-a-set-of-blueprints-cost/ https://news.energysage.com/how-much-does-the-average-solar-panel-installation-cost-in-the-u-s/ https://www.homeadvisor.com/cost/landscape/drill-a-well/ http://www.solarpermitfees.org/SolarPermitLawsSumCA.pdf https://www.homeadvisor.com/cost/foundations/install-a-foundation/ https://www.ebay.com/bhp/40-ft-shipping-containers https://www.universal-containers.com/general-sales/standard-containers https://www.iport.com/containers-for-sale/40ft/