MEPdetect — Symbol detection and circuit tracing for MEP drawings

Everything You Need for Fast, Accurate Takeoffs

Purpose-built AI for MEP contractors and estimators

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Detection You Can Audit

YOLO11 object detection picks out outlets, switches, panels, HVAC equipment and plumbing fixtures. Each one comes back with a confidence score and its box drawn on the sheet, so a count you doubt takes a couple of minutes to check.

→ Verify the takeoff, don't just trust it

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Fast Enough to Use Mid-Bid

A sheet goes from upload to counted in seconds. Send up to 50 files in one batch job, processed back to back, and collect the results together.

→ Spend the hours pricing, not counting

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Trained on Your Drawings

Label examples on your own sheets and the model learns your office's symbols and your clients' standards — specialty equipment, non-standard fixtures, the blocks your library actually uses.

→ Fits how your drawings look, not a generic set

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Exports That Land in Your Spreadsheet

Excel, CSV and JSON: counts per symbol type, coordinates and confidence per detection, plus the annotated sheet. Plain, stable columns your estimating template can read without rework.

→ No retyping, no copy-paste

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Circuit Tracing & Netlists

On a vector PDF, MEPdetect reads the drawing's own line work: it isolates the pen the conductors are plotted with, follows the runs, marks junction nodes, finds the homerun arrowheads and reads the circuit designation beside them. Sheets that annotate circuits instead of drawing them work too. Out comes a netlist CSV and a traced overlay to check against the sheet.

→ Go beyond counting, to connectivity

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The Formats You Already Send Out

PDF, including multi-page plan sets, plus JPG, PNG, TIFF and BMP. Vector PDFs give the best results and are the only ones circuit tracing can read. Working from DWG or DXF? Plot to PDF first.

→ No conversion step in your way

From Upload to Takeoff in 3 Simple Steps

No technical expertise required. No software installation.

Upload Your Drawings

Drag and drop PDFs or images of your electrical, HVAC, or plumbing plans. Support for single files or batch processing of entire projects.

AI Detects Symbols

The model scans each sheet and marks the MEP symbols it recognises — outlets, switches, equipment, fixtures — in seconds, scoring every one.

Export Your Takeoff

Download the counts in Excel, CSV or JSON with coordinates, the annotated sheet to check them against, and the circuit netlist when tracing is on.

See It on Your Own Drawing

No sign-up, no sales call. Upload a sheet and read the output yourself.

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Drop an electrical, HVAC or plumbing sheet here

PDF, JPG, PNG or TIFF — up to 50 MB. Processed in seconds.

What comes back

Annotated sheet — every detection boxed and labeled, so you can check the count against the drawing yourself.
Symbol counts — one row per symbol type, with the per-detection confidence score.
Coordinates — bounding box and centroid for each detection, in image pixels.
Circuit netlist — conductor runs, junction nodes, homerun arrows with their circuit tags, and the devices grouped onto each circuit.
Files — JSON, CSV and Excel, ready to drop into your estimating spreadsheet.

Detection quality depends on the drawing: line weight, scan resolution and how close your symbols are to the ones the model was trained on. Run it on your own sheets before you rely on it for a bid.

Simple, Transparent Pricing

Start free. Upgrade when you're ready. No hidden fees.

Basic

Forever free

5 drawings per month
Standard MEP symbols
PDF & image support
CSV export
Email support
Batch processing
Custom symbol training

Get Started Free

Professional

$49

per month · 14-day trial

Unlimited drawings
All MEP symbol libraries
Batch processing, up to 50 files
Excel, CSV, JSON export
Custom symbol training
Circuit tracing & netlists
Priority email support

Start 14-Day Free Trial

Enterprise

Custom

Everything in Professional
Custom AI model training
REST API access
White-label branding
On-premise deployment
Priority support

Contact Sales

Frequently Asked Questions

How accurate is the AI symbol detection? +

It depends on two things: how close your symbols are to the ones the model was trained on, and the state of the sheet. We do not publish a single accuracy figure, because one number averaged across every drawing office would tell you nothing about yours — and we would rather you measured it than believed it. Every detection comes back boxed and scored on the annotated sheet, so checking a page against the drawing takes a couple of minutes. If the stock model misses your symbols, train it on your own drawings.

What file formats do you support? +

PDF, including multi-page plan sets, plus JPG, PNG, TIFF and BMP. Vector PDFs — plotted straight out of CAD or Revit — give the best results, and they are the only ones circuit tracing can read. Scans work for symbol detection; 300–400 DPI is the useful range. DWG and DXF are not read directly: plot them to PDF first.

Can I train the AI on my company's custom symbols? +

Yes. Professional and Enterprise plans include custom symbol training: label examples of your symbols on your own drawings and the model learns them. How many examples you need, and how long training runs, depends on how distinctive the symbol is and how many classes you are adding — a few dozen examples per symbol is a sensible starting point.

How does MEPdetect integrate with my existing workflow? +

Through files and an API, not a plug-in. The Excel and CSV exports are plain tables — symbol, count, coordinates, confidence — so they import into whatever you estimate in. There is no direct plug-in for Accubid, ConEst, McCormick, Revit or AutoCAD today; if you need one, the REST API is documented and open, and that is the way to build it.

What does circuit tracing actually do? +

On a vector PDF it reads the drawing's own geometry instead of the pixels: it works out which pen the conductors are plotted with, follows each run, marks the junction nodes, finds the homerun arrowheads and reads the panel-circuit designation written beside them. Devices on a run are grouped into a circuit, and circuits carrying the same designation on different sheets are matched up. You get a netlist CSV and a traced overlay image. Sheets that draw no wiring and tag each device with its circuit instead — typical Revit output — are read from those tags. Grouping devices onto a circuit needs the symbols detected first, so that part is only as good as the model is on your drawings.

What happens when the trial ends? +

The Basic plan is free and needs no card at all. The Professional trial runs for 14 days through Stripe Checkout, which does take a card up front, and the subscription starts automatically at the end of the trial unless you cancel first. Cancel any time during those 14 days from your dashboard and you are not charged.

Is my project data secure and private? +

Traffic is encrypted with TLS, passwords are stored only as hashes, and access to the servers is limited to the people who run the service. You keep full ownership of everything you upload and everything we produce from it, and we never use your drawings to train models for anyone else. Two things we will not overstate: stored files are not encrypted at rest in the current deployment, and we are not SOC 2 audited. If either is a procurement requirement, Enterprise can run on your own infrastructure so the drawings never leave your network — or contact us and we will tell you exactly where we stand. The Privacy Policy has the detail.

Stop counting symbols by hand.