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# Chapter 7 Estimating Plumbing, HVAC, and Electrical Work - PowerPoint PPT Presentation

Chapter 7 Estimating Plumbing, HVAC, and Electrical Work. Introduction . Estimates of large and/or complicated projects are prepared by specialists in these trades.

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### Chapter 7Estimating Plumbing, HVAC, and Electrical Work

• Estimates of large and/or complicated projects are prepared by specialists in these trades.

• The ability to compile a takeoff of plumbing, HVAC, and electrical work can also be a useful skill for the builder’s estimator who sometimes needs to put together a quick price for these trades on a small job.

• Also, some builders like to develop their own cost estimate for each trade’s scope of work to ensure that the quotes received are reasonable.

• Little information about the plumbing, HVAC, and electrical systems is shown on the project plans of small jobs.

• The estimator may need to draw sketches to be able to assess the layout of systems for a house.

• These sketches can then help the estimator evaluate measurements such as the length of pipes for water supply and sewers on the job.

Measuring Plumbing (1 of 3)

• Connecting water lines to main are enumerated.

• Water and sewer pipes are described and measured separately in linear feet.

• Fittings and valves are described and enumerated.

• Hangers and supports are described and enumerated.

Measuring Plumbing (2 of 3)

• Fixtures and equipment are described and enumerated, including:

• Water meters

• Gas meters

• Water heaters

• Lavatory basins

• Water closets

• Sinks

• Laundry tubs

• Bath tubs

Measuring Plumbing (3 of 3)

• Items supplied by the builder and installed by the plumber are described and enumerated separately, including:

• Refrigerators

• Garbage disposal equipment

• Dishwashers

• Gas line piping is described and measured in linear feet.

• Permits for the work are described and enumerated.

• Pipe insulation is described and measured in linear feet.

• Cutting, drilling, and patching required for this work are described and enumerated.

Measuring HVAC Work (1 of 2)

• Ductwork is described stating the size and it is measured in linear feet.

• Range, cooktop, laundry, and bath venting are described stating the size and it is measured in linear feet.

• Fittings, hangers, and sleeve frames are described and enumerated.

• Mechanical equipment is described and enumerated, including:

• Air handling units

• Furnaces

• Heat exchangers

• Etc.

Measuring HVAC Work (2 of 2)

• Control wiring is described and measured in linear feet.

• Low voltage wiring is described and measured in linear feet.

• Electric and electronic controls are described and enumerated.

• Testing and balancing are each measured as items.

• Permits for the work are described and enumerated.

• Duct insulation is described and measured in square feet.

• Cutting, drilling, and patching required for this work are described and enumerated.

• Cleanup resulting from this work is measured as an item.

Measuring Electrical Work (1 of 2)

• Wire, cable, and conduits are described and measured in linear feet.

• Cable tray and bus duct systems are described and measured in linear feet.

• Hangers, sleeves, and supports are described and enumerated.

• Electrical equipment, fittings, and fixtures are described and enumerated, including:

• Fire alarm systems

• Security systems

• Communication systems

• Etc.

Measuring Electrical Work (2 of 2)

• Installing appliances is described and enumerated, including:

• Cooktops

• Microwave ovens

• Built-in ovens

• Range hoods

• Permits for the work are described and enumerated.

• Testing and hot checking the entire system is measured as an item.

• Fire stops and flashings are described and enumerated.

• Cutting, drilling, and patching required for this work are described and enumerated.

• Cleanup resulting from this work is measured as an item.

• Instead of a full takeoff on many plumbing, HVAC, and electrical, estimators use shortcuts to compute their prices for the work.

• With plumbing, HVAC, and electrical trades, a price per square foot of gross floor area could be used to provide a rough estimate of the cost, but more accuracy may sometimes be required.

• A quite accurate estimate for plumbing work can be obtained quickly by means of a unit price for each plumbing fixture.

• Enumerating fixtures and multiplying by the applicable price for each fixture can give an accurate price for the complete plumbing work.

• Additional prices may be required for installing appliances, special fixtures, and any out-of-the-ordinary plumbing work.

• Estimate the price of a three-fixture bathroom based on the following prices for the fittings involved:

• 1 bathtub 72” x 36” - \$2,425

• 1 water closet - \$1,450

• 1 lavatory basin 19” x 16” - \$845

• \$4,720

• Extra for pipe and fittings 30% \$1,416

• Total \$6,136

• HVAC work can be estimated quite quickly by using a combination of prices per unit area and unit prices for items of equipment.

• To estimate the total cost of ductwork, multiply the unit price from a past project by the gross floor area of the new house.

• To complete an HVAC estimate, determine how many items of equipment are required, and multiply by the appropriate item price for each item.

• Estimate the price of a 2,200-square feet house with a special humidifier and exhaust fan:

• Basic HVAC 2,200 SF at \$4.25/ SF \$9,350

• Humidifier \$2,000

• Exhaust Fan \$250

• Total: \$11,600

• Electrical work can also be estimated quickly by means of a combination of prices per unit area and prices for items of equipment and fixtures.

• For power wiring and fittings, multiply the number of power outlets by inclusive price per outlet.

• For equipment and fixtures, multiply number of each item by unit price for that item, including:

• Electrical panels

• Sub-panels

• Light fixtures

• Etc.

• Calculate the electrical price for a 2,200-square feet house including a security system with motion detectors:

• Basic electrical: 2,200 SF at \$6.75/ SF \$14,850

• Add security system \$2,500

• Total: \$17,350