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Specifications

Edit specfications.
Most units are inches.

Enclosure

Width
Depth

Exterior Walls

Front Height
Stud OnCenter
Stud Material Thickness
Stud Material Width
Stud Material
Bottom Plate Material
Bottom Plate Material Max Len
Top Plate Quantity
Top Plate Material Max Len
Top Plate Min Stagger
Sheath Material
Sheath Orientation
Sheath Stagger Bays

Roof

Roof Type
Slope (degrees)
Eave Projection
Rafter Material
Birdsmouth Seat Depth
Rafter OnCenter
Rafter Tail Max Plumb Height
Lookout Orientation
Lookout Material
SubFascia Material
SubFascia Thickness
SubFascia Plumb Height
SubFascia Material Max Len
Decking Material
Decking Stagger Bays
Ceiling Joist Material
Ridge Beam Material
Ridge Beam Plys
Ridge Beam Ply Max Len
Ridge Beam Drop
Gable Bottom Plate Material

Floor

Floor Type
Decking Material
Joist Material
Joist OnCenter
Joist Orientation
Decking Stagger Bays
Rim Material
Rim Material Max Len

Foundation

Foundation Type
Material
Mudsill Material
Mudsill Material Max Len
Slab Height
Slab Position
Wall Height
Wall Thickness
Footing Height
Footing Width
Footing Depth
Girder Material
Girder Plys
Girder Ply Max Len
Girder Max OnCenter
Joist Over Girder Cantilever
Girder Over Pier Cantilever
Bracket Length
Bracket Standoff
Bracket Part
Pier Max OnCenter Exterior
Pier Max OnCenter Interior
Pier Diameter
Pier Height
Pier Depth
Pier Material

Openings

Model
Wall
X→
Z↑

Materials

Edit available materials.

Doors and Windows

Model
Width
Height
Cost

Board Lumber

Name
Class
Thick
Width
Length
Cost

Sheet Lumber

Name
Thick
Width
Wgap
Length
Lgap
Cost

Concrete

Name
Cost per Yard

Connectors

Type
Name
Cost

About

BuildFreely is an experimental CAD tool for generating a building model and plans algorithmically.

Use at your own risk.

This tool may generate designs which are unsafe to build and don't adhere to proper building codes.

Video: Talk @PTWD

For feedback: email dan at this domain.

Change Log

Sun May 3 01:39:30 UTC 2026
  • Adds fancy incremental reveal of parts for initial load of 3D model.
Sat Jan 3 02:16:14 AM UTC 2026
  • Simplifies gable end wall, no longer employs top and bottom plates in triangular portion of wall.
  • New code for sheath staggering
Tue Dec 9 05:03:49 AM UTC 2025
  • Adds "skid" foundation type (aka girder only).
  • Fixes pier foundation bugs regarding cantilever, and now allows negative cantilever.
  • Fixes some lookout and subFascia bugs.
Fri Dec 5 07:08:39 AM UTC 2025
  • Fixes interference of top plates of adjacent walls.
  • Fixes errors in shed roof top plates where plates were generated too thin.
  • Adds foundation mudsill material max length specification so long mudsill boards will be split to smaller size.
  • Reduces mouse control zoom and rotate rate for more precise control.
Wed Jan 29 07:53:13 PM UTC 2025
  • Better BOM scaling, and dimension label positioning.
Sat Jan 25 03:46:52 AM UTC 2025
  • Adds concrete foundation type.
  • X Positioning of opening supports mutliples and percents.
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