Build a house system by system and learn the real engineering behind every piece you place. This is not a construction game or a generic 3D viewer - it is a hands-on simulator where each component you add teaches why it exists, what has to come before it, and what calculation governs whether it works.
WHAT YOU BUILD
Choose from 11 real construction disciplines, each color-coded and organized into a hierarchical catalog:
Site / Civil
Structural
Architectural
Electrical
HVAC
Plumbing
Fire Protection
Fire Alarm / Life Safety
Low Voltage / Communications
Energy / Envelope
Renewable / EV
Every catalog item is a real engineering object, not just an icon - footings, foundation walls, studs, beams, joists, trusses, wall assemblies, service panels, ductwork, piping, fixtures, and more.
LEARN BY PLACING
Selecting a component opens its full Engineering Card: what it is, its purpose, where it is used, its inputs, installation considerations, dependencies, connected systems, common mistakes, and inspection points. Placing certain components triggers a live, contextual engineering calculation with a clear PASS or FAIL result:
Footing bearing capacity check
Beam span and load check
Dwelling electrical service load calculation
Branch circuit load check
Duct sizing and airflow check
Plumbing fixture-unit and pipe sizing
Envelope R-value check
Solar array output and inverter sizing
GUIDED TUTORIAL
A full 14-step guided tutorial walks you through an entire build in real construction sequence - Project Setup, Site, Excavation, Foundations, Structural Frame, Building Envelope, Roofing, Plumbing, HVAC, Electrical, Fire and Life Safety, Communications, Finishes, and Testing / Completion. Each step places the right components automatically and shows you the engineering check as it happens. Try to build out of order and the app blocks the move with a plain-language explanation of the real dependency you are missing.
FREE BUILD MODE
Open every discipline at once and build however you want. A live rules engine keeps watching your work in the background and flags issues as you go - an unsupported beam, a fixture with no sanitary connection, a circuit that never reaches the panel, an incomplete thermal envelope. Overlapping systems from different disciplines raise a Coordination Conflict panel with Reroute, Resize, Review, or Undo options.
SEE THE WHOLE SEQUENCE
A Construction Sequence view lists every placed component in real build order. A Construction Timeline slider lets you scrub from Site through Foundation, Frame, Rough-In, Enclosure, Finish, and Complete, revealing and hiding systems exactly as they would appear on a real job site at each stage.
WHO IT IS FOR
Built for engineering, construction, and trades students, educators, and anyone curious about how a house actually goes together. It is an educational simulation with simplified assumptions for teaching purposes - not construction documents, and not a substitute for project-specific professional engineering or design.
Works on iPad and Mac.
