AI and cladding takeoff: where it helps and where it doesn't
Reza5 min read
AI takeoff works well for internal walls and counts, where one floor plan and a standard height are enough. It is not reliable for cladding, because an accurate quantity needs codes, wall types, lengths and heights combined from several drawings. Use AI to read the set, find inconsistencies and draft RFIs, then measure yourself.
Draft.This article hasn’t had its final edit yet, so treat anything specific in it as provisional.
Every month there's a new AI takeoff tool promising to measure a whole drawing set in minutes. For some trades, some of those promises are close to true. For cladding, they aren't yet. Here's where I think AI earns its place in a facade estimate, and where it will cost you money.
Why is cladding takeoff hard for AI?
Because no single drawing holds the quantity. To measure a cladding scope properly you combine at least six sources:
- The elevations, for where your material is and its finish code.
- The finish schedule, for what each code actually is.
- The wall types, for which build-ups include your material.
- The wall setout plans, for which walls carry those wall types.
- The floor plans, for true lengths.
- The sections, for true heights.
Most AI takeoff tools work one sheet at a time. Point one at an elevation and it measures what it sees, and an elevation is a flat projection. It hides setbacks, leaves out walls that sit behind other parts of the building, and shows an angled wall shorter than it is. A wall at 45 degrees to the view shows at about 70% of its real length. The AI isn't wrong about the picture. The picture is wrong about the building.
I go through the full method in how to price a cladding job from the drawings.
Where does AI takeoff work well?
Where one drawing is enough. Two good examples:
- Internal walls and plasterboard. The lengths come straight off the floor plan, and the height is mostly the standard ceiling height for the level. A tool that traces wall lengths on a plan and multiplies by a height gets most of the way.
- Counts. Power points, light fittings, plumbing fixtures, downlights, penetrations. Counting the same symbol across a sheet is exactly the repetitive job software is good at.
| Takeoff task | Can AI do it reliably? | Why |
|---|---|---|
| Counting symbols (electrical, plumbing) | Mostly yes | One sheet, one symbol, a repetitive count |
| Internal plasterboard walls | Mostly yes | Lengths from one plan, a standard height |
| Cladding off the elevations | No | Projection hides setbacks, hidden walls and true angled lengths |
| Cladding across the full set | Not yet | Needs codes, wall types, plans and sections combined and checked |
| Balustrades and pergolas | Check every run | Length is on the plan, height on the section or detail |
Even where AI does well, check the result. A count with a missed legend symbol or a wall traced to the wrong scale is still your price on the line.
Where does AI really help a cladding estimator?
In the part of the job that comes before measuring, which is often the slowest part: reading a 40-sheet set and working out what's in it. This is where I use AI every week.
- Reading the whole set. AI can go through every sheet and pull out what matters to your trade, without you opening each one.
- Matching codes to the schedule. It lists each finish code on the elevations and finds it in the finish schedule: product, colour, finish, thickness, fixing.
- Finding inconsistencies. A code on the elevation that isn't in the schedule. A wall type on the setout plan that doesn't exist in the legend. A colour in the specification that differs from the schedule. These are the things that become variations later if nobody asks.
- Drafting RFIs. Each inconsistency becomes a clear question to the builder, ready to send before the tender closes.
- Giving you a clean list to measure. You go to the plans and sections knowing exactly which codes, which wall types and which walls to take off.
The result is a takeoff that takes less time and is more accurate, because the measuring is done by someone who already knows what the set contains and where it disagrees with itself.
How does Subino use AI on drawings?
Subino has three drawing tools in beta, being tested with our first users now and to be released to all customers:
- Drawings. File a tender set from the job's folder on your computer, with a drawing register and revisions.
- Scope review. AI reads the elevations and the finish schedules and fills a review: one line per finish code and material, with its colour, finish, thickness, fixing, substrate and fire details where the drawings show them, plus RFIs grouped under each scope. You tick the lines that are yours and send them to the Cost Sheet as scopes.
- Quick Takeoff. Measure counts, lengths and areas on the PDF inside Subino, with cut-outs and waste, and send the quantities to the Cost Sheet.
The AI does the reading. You check it and do the measuring, from the plans and sections. Once the quantities are in, they stay with the price inside the revision you priced (measurements that stay with the price), and the rest of the job runs from that estimate (features).
What should you check before trusting any AI takeoff?
- Which drawings did it use? If the answer is "the elevations", the cladding numbers will be short.
- Is the scale right on every sheet? One wrong scale ruins every length on it.
- Did it find every code in the schedule? A missing code is a missing scope.
- Are setbacks, returns and angled walls in the quantity? Check them against the plans.
- Does the total make sense? Compare it with a job you've priced before. Your own history is the best sense check there is (what did we charge last time?).
AI is a fast first reader. It isn't the estimator. Used that way, it gives you back hours on every tender without putting your price at risk.
If you'd like to see the drawing tools on one of your own tender sets, book a 15-minute demo. Pricing shows what each plan includes.
Frequently asked questions
Can AI do a cladding takeoff on its own?
Not accurately, in my experience. A cladding quantity needs the finish code from the elevation, the product from the finish schedule, the build-up from the wall types, the walls from the setout plans, the lengths from the floor plans and the heights from the sections. A tool that measures one sheet at a time misses setbacks, hidden walls and the true length of angled walls.
What is AI takeoff good at?
Jobs where one drawing holds everything you need. Internal plasterboard walls are a good example: the lengths come off the floor plan and the height is mostly a standard ceiling height. Counting symbols is another, such as power points, light fittings or plumbing fixtures.
How can AI help a cladding estimator, then?
Before you measure. AI can read the whole tender set, list the finish codes and match them to the finish schedule, pull out the specification for each material, flag drawings that disagree with each other and draft RFIs to the builder. That gets you to the sections and plans with a clear list of what to measure.
Does Subino have AI for drawings?
Yes, in beta. Subino's Drawings section reads a tender set, fills a scope review with each finish code, its material and its specification, and drafts RFIs for each scope. Quick Takeoff measures counts, lengths and areas on the PDF and sends them to the Cost Sheet. Both are being tested with our first users now and will be released to all customers.
Should I still use Bluebeam?
Use whatever measuring tool you trust. The point of this article is the method, not the tool: lengths from the plans, heights from the sections, codes and specifications checked against the schedule. AI helps you get there faster, it doesn't replace the checking.