| Course | MT382 Construction Cost Estimating |
|---|---|
| Unit | Unit 3 |
| Paper type | Location and time adjustment |
| Length | About 870 words, 6 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | BS in Business Administration |
| Updated | October 2026 |
Free sample paper for MT382 Unit 3
Place First, Then Date: An MT382 Unit 3 Location and Time Adjustment of a Comparable Recreation Center
[Student Name]
Purdue University Global
MT382: Construction Cost Estimating
Unit 3 Location and Time Adjustment
[Instructor Name]
[Date]
The comparable, indexes and cost split are composite and supplied with the case; the sources cited are real.
The Comparable and the Indexes
The comparable is a two-story recreation center of 34,900 square feet with a two-court gym and fitness rooms, bid three years ago in a larger city. Its building cost, excluding site work, was 10,612,000 dollars. The case supplies three index values: a city cost index of 108.9 for the comparable's city and 91.6 for the project's city, where the national average equals 100, and a historical cost index rebased to 100 in the comparable's bid year and standing at 107.1 now.
Method One: Weighted-Average Index
Location and time are handled as separate operations, each a ratio, because they answer different questions. The city index compares places at one moment, so the ratio 91.6 over 108.9, or 0.8411, moves the cost from one city to the other: 10,612,000 dollars becomes 8,926,163. The historical index compares moments in one place, so the ratio 107.1 over 100 brings the bid-year price to the present: 8,926,163 becomes 9,559,921 dollars, or 273.92 per square foot. Neither step touches the other. Ashuri and Lu (2010) show that construction cost indexes move with their own momentum and seasonality, which is why the time step uses the published index rather than an assumed annual rate.
Method Two: Division by Division
City indexes publish values by division, with material, installation and total columns, because local prices differ more for some trades than others. The comparable's bid tabulation splits its cost across nine division groups, and each group is moved by its own ratio of project-city to comparable-city index, then by the same time factor.
Concrete, 1,485,680 dollars at a ratio of 0.84, becomes 1,336,577. Masonry, 1,910,160 at 0.697, becomes 1,425,910. Metals, 1,273,440 at 0.95, becomes 1,295,662. Wood, plastics and composites, 318,360 at 0.80, becomes 272,771. Thermal and moisture protection, 955,080 at 0.84, becomes 859,228. Openings, 848,960 at 0.92, becomes 836,497. Finishes, 1,061,200 at 0.83, becomes 943,333. Fire suppression, plumbing and HVAC, 1,804,040 at 0.855, becomes 1,651,968. Electrical, 955,080 at 0.849, becomes 868,434.
The total is 9,490,380 dollars, or 271.93 per square foot, 0.73 percent below the weighted-average result.
The division method earns its page by showing where the average misleads: a masonry-heavy comparable moved to a city where masonry is cheap.
Why the Methods Differ
The difference comes mostly from masonry. The comparable spent 18 percent of its building cost on masonry, more than a typical building, and the project city's masonry index sits far below its overall average, at a ratio of 0.697 against 0.841 for the weighted average. The weighted-average method treats every dollar as if it moved by the average ratio, so it overstates what masonry would cost in the project's city. Metals, priced in a national market, move least. Holm et al. (2005) recommend division-level adjustment whenever a comparable's cost mix differs from the average building, and this comparable's does.
Checking the Conceptual Estimate
The conceptual estimate in Unit 2 used an adjusted database rate of 296.08 dollars per square foot. The comparable, adjusted, comes to 271.93, about 8 percent lower. Adjusted the same way, the database's quartiles sit at 254.32 and 352.07, so the comparable falls in the lower half of the spread, between the lower quartile and the median. The comparable has no elevated track and a smaller lobby, which explains part of the difference. The conceptual estimate is therefore conservative rather than wrong, and the board can read the comparable as evidence that the building rate is not understated.
Is One Comparable Enough?
A single comparable is a check, not an estimate. Its program, site and bid climate are particular to it: it may have been bid in a busy year, or by a contractor eager for work, and nothing in its tabulation reveals that. The adjustment therefore confirms that the conceptual building rate is reasonable, but it does not replace the database median, which reflects many buildings. If two or three more comparables could be found, adjusted the same way and averaged, the check would carry more weight. Until then, the comparable's role is to show that the conceptual figure is not out of line with a real bid for a similar building.
Escalation Is a Separate Step
The time factor brings prices only to the present. Carrying them to the midpoint of future construction is escalation, which depends on when the project will be built and belongs in a later memo. Mixing the two would hide a forecast inside an index.
A Warning About Double Adjustment
Cost data that is already localized must not be adjusted again. If the 0.916 city ratio were applied to this result, which is already in the project city's prices, cost would be understated by about 803,000 dollars. The adjustment sheet therefore records, for every figure, whether it is national, comparable-city or project-city, so no ratio is applied twice. AACE International (2020) treats documentation of such adjustments as part of what makes an early estimate usable.
References
AACE International. (2020). Cost estimate classification system: As applied for the building and general construction industries (Recommended Practice No. 56R-08). AACE International.
Ashuri, B., & Lu, J. (2010). Time series analysis of ENR construction cost index. Journal of Construction Engineering and Management, 136(11), 1227-1237. https://doi.org/10.1061/(ASCE)CO.1943-7862.0000231
Holm, L., Schaufelberger, J. E., Griffin, D., & Cole, T. (2005). Construction cost estimating: Process and practices. Pearson Prentice Hall.
MT382 Unit 3 instructions, in plain terms
In Unit 3, students adjust the cost of a comparable project to their project's location and price date using cost indexes. Location and time should be handled as separate ratios, with the index values and their sources stated. Instructors often ask for both a weighted-average adjustment and a division-level adjustment, and for an explanation of any difference between them. The adjusted result should then be compared with an earlier estimate. Students should distinguish moving prices to the present, which indexes do, from escalating them to a future construction date, which is a forecast. Documenting whether each figure is national, comparable-city or project-city prevents double adjustment. One comparable should be treated as a check.
How the MT 382 Unit 3 example is put together
Our sample's source section states the comparable's area, cost and the three index values. Method one applies the city ratio, then the time ratio, showing each intermediate figure and citing Ashuri and Lu on index behavior. Method two lists nine division groups with their costs, ratios and results. A highlighted line explains why the division method earns its page, and a section traces the difference to masonry, citing Holm and colleagues. The result is checked against the conceptual estimate's rate and adjusted quartiles. A section on the limits of one comparable follows, escalation is kept out of the time step, and a warning about double adjustment closes the paper.
MT382 Unit 3 rubric: what earns full points
Index adjustments are usually graded on correct ratio arithmetic, separation of location and time, the quality of the division analysis and the usefulness of the comparison. Ratios set up in the right direction, with sources, earn the basic marks. Rubrics reward explaining why two methods differ, especially when the explanation points to the comparable's cost mix. Comparing the result with the earlier estimate and saying what it means shows purpose. Keeping escalation separate and warning against double adjustment show care with data. Treating one comparable as a check, not a replacement, shows judgment. The index sources are cited in APA 7, and each dollar amount on the sheet traces back to a stated input.
MT382 Unit 3 help: mistakes that cost points
A frequent error in these papers is dividing the indexes the wrong way, which moves cost in the wrong direction. Another is combining the city and time steps into one ratio without showing either, so mistakes cannot be found. Many students apply a city index to data that is already localized, understating cost. Some use the historical index to project into the future, which turns an index into an unsourced forecast. Division-level work is often skipped even when the comparable's mix is unusual. Before finishing, label every figure on your sheet with its place and date. If any figure carries two labels of the same kind, it has been adjusted twice.
Get an MT382 Unit 3 example written to your instructions
Which base cost, which two cities, which two dates? Those facts from your Unit 3 prompt, plus whichever index tables or cost references the course relies on and the rubric, are all a first adjustment needs. Nothing is charged for it, and it comes back in 24-48h with each ratio running destination over origin and location kept apart from time. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
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MT382 Unit 3 questions, answered
How do city cost indexes work?
They express a location's construction costs relative to a national average set at 100, usually with separate material, installation and total columns for each division. To move a cost from one city to another, multiply by the destination index divided by the origin index. They compare places at one moment and do not adjust for time.
Should I use the weighted average or division indexes?
The weighted average is quicker and often close enough for an early figure. Division indexes are better when the building's trade mix differs from typical, as with a masonry-heavy structure or an unusually large mechanical system. If your prompt allows, calculate both and explain any difference, as the sample does.
Is a time adjustment the same as escalation?
No. A time adjustment uses historical indexes to move a past cost to the present. Escalation projects today's prices ahead to the period when the work is actually purchased, commonly taken as construction's midpoint, using a forecast rate. Keep them as separate steps so a reader knows which part rests on records and which on a forecast.
Where can I find a free MT382 Unit 3 sample paper?
The full MT382 Unit 3 location and time adjustment is on this page, moving a comparable recreation center by city and historical cost indexes.
Why does the division method come in lower in the MT382 Unit 3 sample?
The comparable spent 18 percent of its cost on masonry, and the project city's masonry index ratio of 0.697 sits far below the overall ratio, so the average overstates masonry.