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Cst M 371 - Estimating II

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  1. design-build cm at-risk or cmgc negotiated projects Cst M 371 - Estimating II preconstruction & conceptual estimating

  2. sage advice… How do you eat an elephant? One bite at a time.

  3. methods, tips & tricks… scope of work strategy build it before you build it…

  4. methods, tips & tricks… strategy

  5. start with control quantities… gross square foot (gsf) take-off exterior wall (perimeter) x height site area # of floors reliance upon duplicity… same quantity for multiple uses saves time & ensures accuracy

  6. track your work… leave bread crumbs…just in case: confirmation omission errors assurance

  7. target based design/estimate… g

  8. methods, tips & tricks… scope of work

  9. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811) sample of drawings provided by designer:

  10. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811) scope of work as provided by designer: location: 15 miles from St. Andrews, Scotland lot size: 430’ x 230’, level site, solid base, rock plan view: 42’ ᶲ @ base & 14’ ᶲ @ top floor elevation: 116’ tall - 90 courses of stone specifications: solid granite outside casing, sandstone inner core…engineered connection of stone…light room shell is cast iron w/ copper…roman cement at exposed areas

  11. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811) scope of work realities @ site: location: 15 miles of the coast of Scotland site: treacherous submerged reef 12’ below surface @ high tide 4’ above surface @ low tide weather: brutal storms most of the year 5 month window / year of “decent” weather

  12. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811) scope of work realities @ time: materials: granite & sandstone shortage economics: currently @ war w/ France $’s funneled to war effort labor shortages

  13. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811) scope of work realities @ construction: temporary construction: floating lighthouse temporary housing: 2 schooners & structure equipment: balance crane, swing crane, winch crane, beam crane, rail tracks, wagons, sling carts, pumps, jacks & wedges stone delivery: schooner - 2 praams - site

  14. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811) scope of work realities @ completion: budget: $80,000 (in 1807 $’s) final cost: $120,000 (in 1811 $’s) lesson #1: 50% overrun due to designers lack of understanding of scope in terms of site, time and construction context lesson #2: estimator must understand scope

  15. scope of work tangent… Bell Rock Lighthouse, Scotland (1808 - 1811)

  16. methods, tips & tricks… build it before you build it…

  17. visualize & plan…

  18. seems like a daunting task…

  19. end of lecture #6