When your plan set has no wall-type legend (or a scrambled one): how to take off walls anyway

Most wall-type work starts with the legend: a table that says tag A4 is a 2x4 stud wall with 5/8" board both sides, and C4 is the rated version. Then a plan set shows up without one, or with a legend whose text is unreadable. The measuring is still doable. What changes is how much of the material call you have to make yourself, and how carefully you document it.

What you are missing when the legend is gone

A wall type legend (also called a partition schedule or wall types table) defines each assembly once and gives it a tag that the floor plans reuse. Our guide on how to read a wall type legend walks through a real one. Without it, a tag on a plan tells you nothing, and two walls that look identical can be different assemblies. In the Freeport Square set we tested, A4 and C4 are the same thickness but one needs fire-rated board. You cannot tell them apart by measuring.

The length of a wall is rarely the problem. The material behind it is.

Four ways a legend goes missing

• No legend at all. Common on small remodels and some tenant improvement sets, where notes are scattered across sheets.
• The legend lives somewhere else. Exterior walls are often detailed on separate wall sections, and the partition legend only covers interior walls.
• The legend is a scan or low-resolution image. Fractions like 4 3/4 and 4 1/4 become easy to misread.
• The text is scrambled. This is the one we ran into ourselves. In the Freeport Square set, the wall-type legend shares a sheet with the door schedule, and the two tables' columns are interleaved in the drawing layout. Pull the text out of that sheet and the two schedules come out mixed together. The layout is a quirk of that one architect's sheet, not something every plan set does. The full story is in our Freeport Square write-up.

How to take off walls by hand without a legend

1. Search every sheet for the information in another form. Check the general notes, the wall sections and details, the finish schedule and the specs. A wall section often gives the assembly even when the table is missing.
2. Group walls by drawn thickness. Measure a few walls and note their finished widths. A 4 3/4" wall is likely a 2x4 stud with board both sides, but thickness alone is a clue, not an answer. Different assemblies can share a thickness.
3. Mark rated walls separately. Look for rating hatching, tags or notes on the plan. Rated board is easy to lump into a non-rated count.
4. List your assumptions on the bid. Write down which assembly you assumed for each wall group. If the architect later says otherwise, you have a record and a clean basis for a change.
5. Send a request for information. If the set does not define a wall that carries real material cost, ask. A one-line question to the architect or GC is cheaper than a wrong assumption on a large quantity.

What a tool should do when it cannot match a wall

Whatever you use, there is a simple test. When the tool cannot tie a wall to a legend entry, does it tell you, or does it pick the most common assembly and move on? A plausible guess is still a guess, and nothing on the row warns you.

ReadMyBlueprint is built around the first behavior. It measures each wall from the PDF's vector geometry, its length and drawn thickness, calibrated to the sheet's printed scale. It then compares that thickness to the legend. If exactly one entry fits, the wall is matched. If more than one could fit, it is ambiguous and every candidate is shown. If nothing fits, it is needs confirmation. Read more on wall-type matching and confidence labels.

That also covers the no-legend case. Every wall is still measured, but without a legend to check against, most results come back as needs confirmation rather than matched. The measurement is real. The material assignment is not guessed. Those rows stay flagged in your export until you confirm them, and the export includes a label column so anyone reviewing the file can see what was verified and what was not.

When the legend exists but the tool cannot read it

This is the scrambled-sheet situation. In our Freeport Square test, 68.9% of walls were auto-matched, and 99.8% after one "Confirm all". That is one 21-page plan set, not a promise about yours. For a sheet the automatic read cannot resolve, there is a way around it: you can type the wall-type-to-assembly mapping into a spreadsheet yourself (TYPE / STUD SIZE / GYP THICK, or TYPE / WALL WIDTH columns) and import it instead of confirming each wall one at a time. Every row stays reviewable before anything saves.

Whatever the tool, the principle holds: you are the one who knows what the architect meant. Software should shrink the typing and show you where to look. It should not decide silently.

A practical checklist

• Open the PDF and check which sheet holds the legend before you measure anything.
• Confirm the legend text is selectable. If it is a picture, ask for a digital export. See vector vs. scanned PDFs.
• If the legend is missing, find the same information in wall sections and notes.
• Flag every wall you could not tie to a source, and carry that flag into your proposal as an assumption.
• Do not let a tool fill in a material you cannot trace to the drawings.

Common questions

What do I do if my plan set has no wall-type legend?
Look for the same information in wall sections, details, general notes and the finish schedule. Group walls by drawn thickness, mark rated walls separately, write your assumptions into the bid, and send an RFI for anything with real material cost. ReadMyBlueprint still measures every wall, but without a legend to check against, results mostly come back as needs confirmation rather than matched.

Can I guess the wall type from its thickness?
Thickness is a clue, not an answer. Two different assemblies, such as a rated and a non-rated wall, can share the same finished thickness, so confirm against a legend, section or note before pricing.

What happens to walls ReadMyBlueprint cannot match to a legend?
They are labeled needs confirmation and stay flagged in your export until you confirm them. The material is not guessed.

What if the legend text is scrambled or unreadable?
Type the wall-type-to-assembly mapping into a spreadsheet (TYPE / STUD SIZE / GYP THICK, or TYPE / WALL WIDTH columns) and import it, rather than confirming each wall one at a time. Every row stays reviewable before anything saves.