Deterministic math. Not an AI chat wrapper.

The deepest trade in the engine, and the one most sets are opened for: 54 Ontario rules, 28 of them answered by measuring the drawing instead of asking you to look.

• Room areas and ceiling heights are measured from traced outlines — 7.0 m² minimum for a sleeping room, 2100mm clear over 75% of a habitable one
• Stairs are checked riser by riser: 125–200mm rise, 235mm minimum going, 860mm clear width, and 3700mm maximum rise between landings
• Every bedroom is checked for an egress window of at least 0.35 m² and for glazing worth 10% of its own floor area
• Attached garages are checked for the separation the OBC requires, and any flight of three risers or more for a handrail

Every architectural rule, and which of them read the drawing →

The panel schedule on the drawing is read circuit by circuit, and every one is checked against its own breaker.

• Panel schedules are read off the sheet as tables — both sides of a two-sided panel
• Connected load stated in VA, watts or kVA is converted to amperes using the panel’s own voltage and the circuit’s pole count
• Every circuit is checked against 80% of its breaker rating, the OESC continuous-load limit
• A circuit whose panel states no voltage is reported as unchecked rather than passed — a guessed voltage is how a 600V panel gets a false overload

Every electrical rule, and which of them read the drawing →

A mechanical takeoff is only as good as the structure underneath it, so this one will check.

The rule is written and the report surface is built. What is not built is the stage that reads equipment weights off the mechanical schedule, so this check does not yet fire on a real drawing.

• Roof-mounted equipment is cross-referenced against the structural drawings for dunnage
• No support found anywhere in the structural set is flagged before the roof is framed
• The spatial mapping runs in its own microservice, off the request path

A device count doesn't catch a run that's too long to work — this will measure the actual path.

The 90 m limit is written as a rule. Measuring the pathway from an IDF to each device requires plenum routing the extraction does not do yet.

• Exact point-to-point cable length is calculated through the ceiling plenum
• Every run is measured from its IDF closet to the device
• A run past the limit forces the closet addition into the bid, ahead of any change order

A fire rating is only real with the hardware it was tested with, so the hardware will get checked too.

Door schedules and their fire ratings are already read. Matching a separate hardware schedule onto each door is the part still being built, and until it is the check reports every rated door as unverified rather than compliant.

• The hardware schedule is cross-referenced against the life-safety and egress sheets
• A fire partition without a labeled, fire-rated closer is flagged before hardware ships
• An egress door missing its panic hardware is caught the same pass

For a foundational trade, a model guessing at volume is dangerous, so this one does the math instead.

• Cubic yards come from strict deterministic math on footing, wall and slab dimensions
• The result is cross-checked against the geotech report's allowable bearing capacity, once that figure is on the estimate
• Historical takeoffs cache locally first, syncing only once encrypted

Every concrete & structural rule, and which of them read the drawing →

It needs no fire drawings. Every check it can answer is egress geometry — stairs, doors, windows and separations that are already on the architectural sheets.

• Exit doors are checked for 860mm clear width and 1980mm height
• Exit stairs are checked against the same rise, going, width and landing limits as the architectural audit, because they are the same stairs
• Sleeping rooms are checked for a compliant egress window
• The garage-to-dwelling separation is checked for both the assembly and its 30-minute rating, and a fire-rated door for a labelled, rated closer

Every fire protection rule, and which of them read the drawing →

The statistics block on the site plan is read by position, and the numbers in it are checked against the by-law, with bounds that stop a setback being invented.

• Lot area, frontage, gross floor area and setbacks are read from the statistics table on the site plan
• Front, rear and side setbacks are checked against RD-zone minimums — 3.0m, 7.5m and 0.9m a side
• Lot coverage is checked against 33% and floor space index against 0.6
• A figure the sheet does not state is reported as missing, never assumed — an invented setback is how a compliant lot fails an audit
• Landscape and hardscape — driveways, pools, decks, retaining walls — aren’t parsed as their own line item, but any square footage the site plan folds into its lot-coverage or setback figures is caught by the same checks above

Every site & civil rule, and which of them read the drawing →

SB-12 sets a minimum effective RSI. Drawings mostly state nominal batt ratings, and the two differ by about a third, so this check refuses to compare them.

• Above-grade walls are checked against RSI 4.03 effective for Climate Zone 6
• Attic and ceiling against RSI 10.14, foundation wall against RSI 3.85, slab perimeter against RSI 1.76
• Only a stated effective RSI, or one the drawing explicitly labels effective, is compared
• A nominal figure is returned for review — comparing nominal against effective fabricates CRITICAL failures on walls that comply

Every energy & envelope rule, and which of them read the drawing →