Compare addendum sheets and copy takeoff

Zip Takeoff matches each sheet in an addendum PDF to the older sheet with the same number, marks the old one Superseded and overlays the pair in red and cyan. You see what changed and copy takeoff across, with an estimator seat.

What it's useful for

An addendum reissues a few sheets of a large set, and the banners show which measured sheets were replaced.
A reissued sheet moves a curb line, and the overlay shows which shapes to adjust.
Most of a reissued sheet is unchanged, so you copy the old takeoff and edit only the revised areas.

Add the addendum to the project

A sheet in a PDF added later with the same sheet number replaces the older one. When several addenda reissue a sheet, the most recently added wins.

Open the project that holds the original plan set.
On the Sheets tab, click Add PDF and pick the addendum file.
Wait for the new sheets to finish processing and take their names from the title blocks.
Rename any sheet still called Page N: hover it, click the pencil icon and type its number.

Compare the old and new sheet

The new sheet carries its own banner that starts with Replaces, with the same Compare button.

Open the old sheet; its banner starts with Superseded by and names the new sheet.
Click Compare in the banner.
Wait for the overlay to render: red was removed, cyan was added, black is unchanged.
Scroll to zoom and drag to pan to each red or cyan change.
Click Close to return to the sheet.

Compare on a superseded sheet opens the red and cyan overlay, then zooms in on a paving limit the addendum moved.

Copy takeoff to the replacement sheet

Copying brings every takeoff object across, cutouts included, in the same conditions (named, colored measurement groups with a unit). A replacement with no scale or legend yet takes the old sheet's.

On the old sheet, click Copy takeoff to replacement; the replacement sheet opens with the copy.
Or, from the replacement sheet, click Pull takeoff from old sheet; the button shows how many objects will come across.
Edit each copied shape where the new linework moved.
Delete the superseded sheet, or its takeoff, once the replacement is checked.

Limits and checks

Matching uses sheet numbers only. Fix sheet names before you look for banners; a sheet whose title block wasn't read stays Page N and never matches.
Only sheet numbers written as letters, a hyphen and digits, such as C-5 or GP-05, are matched. A sheet named C5 or Sheet 5 gets no banner.
Compare is a pixel overlay: red removed, cyan added, black unchanged. A sheet re-plotted with any shift lights up entirely.
Copied takeoff is not re-aligned. It lands at the same coordinates it had on the old sheet; check it against the new sheet before trusting it.
A replacement with no scale takes the old sheet's scale when you copy. Measure a labeled dimension on the new sheet before relying on its quantities.
The old sheet keeps its takeoff after a copy, and every sheet counts in the estimate, so quantities count twice until you delete the superseded sheet or its takeoff.
Copying twice puts two sets of takeoff on the replacement.

Questions

How does Zip Takeoff know which sheet an addendum replaces?

By sheet number only. A sheet in a PDF added later with the same number, such as C-5, supersedes the older one. Sheets still called Page N, or named without letters, a hyphen and digits, get no banner.

Does copied takeoff move to match the revised drawing?

No. Copied takeoff lands at the same coordinates it had on the old sheet. Use Compare to find what moved, then edit those shapes on the new sheet.

Will my quantities double after I copy takeoff?

Yes, until you delete the old copy. The old sheet keeps its takeoff and every sheet counts in the estimate, so delete the superseded sheet or its takeoff once the replacement is checked.