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How BIM saves money on a house project

Modeling is an added service, so it must pay for itself. It does that in four specific places: rework, ordering, comparison and change control.

6 min read

House model beside a piggy bank and coins

1. Less rework

Every clash resolved on screen is a breaking-and-rebuilding job that never happens. Rework does not only cost material — it costs labour twice and delays every trade behind it.

2. Ordering closer to actual

Quantities taken from a model are element-by-element: this many cubic metres of concrete, this weight of steel by diameter, this many blocks by wall. Ordering from thumb rules usually means either over-ordering, which sits and deteriorates, or under-ordering, which stalls the site.

3. Real comparison between quotes

When you hand three contractors the same coordinated drawing set and the same schedules, their quotes become comparable. Without that, a lower quote often just means less scope, discovered later as extras.

4. Controlled changes

Design changes are normal. What costs money is a change made in one place and not reflected elsewhere. In a model, the change updates the plan, the section, the schedule and the quantity together.

Being honest about the cost side

BIM adds a design-stage fee and asks you to make some decisions earlier than you might like. It is not free, and it does not remove the need for a good contractor. What it removes is the guessing.

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