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Estimating Probable Cost


Providing reasonably accurate estimates of probable cost is something that most architects provide as a part of their basic services. Understanding what you can and can't afford helps you as a client make good decisions about what you want in a building before bids are received. Choices to reduce costs after receiving high bids are usually made in haste and many times simply left up to the discretion of the architect. The careful planning that went on before bidding may be forgotten in the rush to get the project within budget.

We attempt to be conservative, with the result that most projects are bid slightly under estimates of probable cost. A plus-or-minus 10% accuracy is considered normal and with a few exceptions we are in this range on the original bids. This is important if you, as a client, have a limited budget or are dealing with public funds that must be spent wisely.

Our record of estimating probable cost on major projects since 1982 is shown on the following spreadsheet. The "Estimated Base Bid" column represents numbers based on drawings and specifications being issued to contractors prior to bidding. These numbers represent original estimates and contractor bids; none of them are re-bid figures.

Contact: sdesign@midrivers.com