Most construction budget overruns don't start on site. They start on paper.
Five mistakes. All preventable. All expensive.
1. The Title Block Nobody Verified
Every permit set has a title block. Project name, address, sheet number, revision date.
Most builders never read it.
A wrong project address on a title block gets flagged by the permit reviewer. The set comes back. Resubmission takes a week. In jurisdictions with permit backlogs : that one wrong line costs two weeks of schedule before a single nail gets driven.
2. The North Arrow That Was Wrong
A site plan with an incorrect north arrow sends the entire build in the wrong direction. Literally.
Contractors orient the building on site using the site plan. A wrong north arrow means the garage faces the wrong street. The driveway connects to the wrong side of the lot. The house sits backwards on the property.
According to construction error studies, orientation mistakes on site plans are among the top causes of costly pre-construction rework in residential projects.
3. The Structural Engineer Who Wasn't in the Loop
The architect moves a bearing wall three feet for a better floor plan. The structural engineer's drawings don't get updated to match.
The contractor follows the architectural plan. The foundation doesn't support what's above it.
The American Institute of Architects identifies structural coordination gaps as one of the leading contributors to construction claims and disputes in residential documentation.
4. The Fire Rating Nobody Checked
In attached housing or any unit with a shared wall, fire ratings are a permit requirement. A one-hour rated wall assembly needs specific materials, specific thicknesses, specific details documented correctly.
A generic wall section copied from a previous project with a different rating. A note that says "fire rated assembly" without specifying which one.
The International Residential Code requires fire separation documentation to be explicitly detailed on construction drawings (not implied or referenced generically).
5. The Sheet That Didn't Match the Revision
A revision cloud on one sheet. Four other sheets referencing the same condition. Only one got updated.
The floor plan shows the revised window location. The elevation still shows the original. The contractor builds to the elevation because it was the last sheet they looked at.
The Construction Management Association of America notes that incomplete revision coordination across drawing sets is a primary driver of RFIs and field change orders on residential projects.
Every one of these is a coordination failure, not a design failure. They happen on good projects run by good teams. The difference is having a systematic process for catching them.
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