Built-Form Cost Tool · prototype · introduction

Where the GEA goes

Every m² of gross external area: area by use, then circulation and services. Areas are measured to exterior faces, so each use carries its share of the walls. The lines add back to GEA.

Suites

Whole suites that fit in the net residential area, split by the mix. Doors and fixtures come from each type's rooms.

Floor by floor

Corridor vs point access (same massing)

The same building under each egress approach. Eliminating corridors and stairs turns common area into sellable area.

Envelope & massing

Pick any ⓘ figure to light up its surfaces in the model and see its working.

Exterior doors

Counted by type, each with its rule. Doors are not cut out of the wall areas. Exits at grade and roof access come off the stairs here, so they are not counted twice.

Partitions

Wall area on one face. Your partition ratios (Core & egress step: overall, parking, retail / office) set the building total; the measured walls are backed out and the rest is carried as other partitions.

Foundations & excavation

Measured from the column grid and the lowest plate; drawn below grade in the model (footings, pads, walls, stubs, and the dig outline).

Trade packages

The same components grouped by tender package, in division order. Scope boundaries vary by region and by builder: copy a template, re-cut which items go where, and mark each item included, excluded or by others. ▸ opens a package: its items, their rates (enter your own here) and the scope checklist.

Elemental cost

Each element is built from components (draft assemblies in data/assemblies.js); ▸ opens one. This view shows where the cost sits. Rates are reviewed and entered on the trade side: switch to By trade package and open a package.

Add-ons & all-in total

Applied in order on the running total; escalation compounds annually to the construction midpoint. Enter your own % to override.