This is where many projects go off the rails—because these items aren’t always discussed upfront.
Common overlooked costs include:
Permits (required in most cities and towns)
HOA approvals, which can delay timelines
Drainage and site prep, especially in older yards
Tear-outs, if an existing structure needs demolition
Structural engineering, often required by cities or HOAs before approval
A low quote often ignores these realities. A professional estimate accounts for them from day one.