How do you calculate construction quantities from PDF drawings?
How do you calculate construction quantities from PDF drawings or photos?
How do you calculate construction quantities from PDF drawings or photos?
You upload a PDF drawing or a photograph of a drawing to a quantity takeoff tool, and it extracts the geometry and returns measured construction quantities (kiekių skaičiavimas) ready to price — no re-drawing in CAD and no manual counting. The Dimetris quantity takeoff tool has done exactly this for over four years, and is used daily by some of Lithuania's largest construction companies, with clients in Sweden and Norway as well.
Why is manual quantity takeoff a problem?
Takeoffs are where construction estimates bleed time and accuracy. Estimators count linear metres of pipe, square metres of floor, and fixtures across dozens of drawing sheets by hand. It's slow, repetitive, and error-prone — a single misread quantity sits silently in the estimate until the concrete is already poured. From our construction expert-review (ekspertizė) work auditing Lithuanian project budgets, misread quantities are not a rare problem; they are the default one.
What inputs does the Dimetris tool accept?
Two: a PDF export of the drawing from the architect, or a photograph of a drawing — including a photo taken on site. The tool reads what estimators actually have on hand, extracts the geometry, and hands back quantities ready to flow into an estimate. There is no requirement to own or open CAD software.
Does it actually work in production, or just in a demo?
It has run in production for over four years. The honest test of construction software is whether firms still pay for it years after launch, not whether it demos well. Today the tool is used by some of the largest construction companies in Lithuania — high-volume, demanding estimators who drop tools that waste their time — and it has held those accounts for four years.
Do construction firms outside Lithuania use it?
Yes. Alongside Lithuanian clients, the tool serves construction firms in Sweden and Norway. Construction drawings follow broadly universal conventions, so a takeoff tool built for the Lithuanian market transfers to Scandinavian projects with minimal friction. The core value — removing hours of manual measurement from an estimator's day — is the same in every market.
How much time does it save an estimator?
The tool replaces the slowest manual stage of estimating: measuring quantities by hand across a full drawing set. For estimators handling multiple bids a week, that is the difference between a takeoff measured in hours and one measured in minutes. Four years of renewals across three countries are the practical evidence that the time saved justifies the tool.
Where measurement errors usually come from
Most takeoff mistakes are not arithmetic. They come from scale: a drawing exported at the wrong ratio, a plan printed to fit the page, or a photo taken at an angle. Before trusting any automated measurement, check one known dimension on the sheet — a door width, a grid spacing, a room length — against the extracted value. If that single reference matches, the rest of the sheet is usually consistent.
The second source is scope, not geometry. A measured area says nothing about layers: screed, insulation, membrane and finish may share the same square metres but belong to different cost lines. Quantities are only useful once each measured surface is mapped to the works that actually happen on it.
How the output is used in pricing
Extracted quantities feed a bill of quantities, which is then priced with normative rates or supplier quotes. Professional measurement rules — for example those maintained by RICS — exist precisely so two estimators measuring the same drawing arrive at comparable numbers. Automation speeds up the measuring; it does not replace the rule set that makes the result comparable and auditable.
Related reading: 7 estimating mistakes that cost 10–30 % of the budget (in Lithuanian).
Dimetris builds construction cost estimation, expert review (ekspertizė) and digital tools for the construction industry across Lithuania and Scandinavia. Quantity takeoff from PDF and photo is one of them.
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