Catch it once.
Before the next start.

A trim detail left off a single elevation does not fail once. It ships on every house that plan touches, and it keeps shipping, because nothing in the process is looking for it. The custom builder makes a mistake. You make an edition.

It gets caught by the trade whose work it physically blocks, at their stage, on the first lot that reaches them. So the delay is however long that takes, and every lot released behind it is already wrong by the time anybody knows.

A change after start can reveal a plan issue, a changed requirement or a field condition. Keep its cause with the revision record so the next release can use what the team learned.

The cost goes into a catch-all account, or a friendly trade eats it and sends his guys home early, or a late design change gets coded as variance instead of as a design change. Architecture is not slow here. It is deaf.

A little more into concrete, gravel, lumber, roofing, and now the numbers come in clean. Once the baseline is padded, a bad takeoff cannot be detected by variance reporting at all, because there is nothing left to vary from.

A repeat visit still uses time even when it does not become a separate invoice. Recording why it happened gives the plan and field teams something concrete to review.

A new plan or revision can reset what crews have learned from the last start. Keep the relevant field feedback alongside the change instead of relying on repetition to carry it.

The count is not the problem. You can run as many plans, elevations and options as you like, provided there is a system and trained people holding them. Without that you are a custom builder wearing a production process.

Check the applicable approval and revision process before making a field change. Carry the revised decision back into the plan so the next start does not inherit an outdated instruction.

Sales are up and profit is down and nobody can say why, because every individual event was small enough to absorb. By the time the number is big enough to see, the houses are finished and the plan is still wrong.