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Cost: -
Height: - inches

Saved Designs

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Design

Edit design specfications.
Most units are inches.

Enclosure

Width
Depth
Height

Walls

Stud OnCenter
Stud Material
Stud Material Thickness
Stud Material Width
Bottom Plate Material
Bottom Plate Material Max Len
Top Plate Quantity
Top Plate Material Max Len
Top Plate Min Stagger

Sheathing

Material
Orientation
Stagger Bays
Adjust Top
Adjust Top Gable
Adjust Bottom

Roof

Roof Type
Slope (degrees)
Top Plate Orientation
Eave Projection
Birdsmouth Seat Depth
Rafter OnCenter
Rafter Material
Fly Rafter Material
SubFascia Material
Lookout Material
Rafter Tail Max Plumb Height
Fly Rafter Max Plumb Height
SubFascia Max Plumb Height
SubFascia Material Max Len
Fly Rafter Material Max Len
Lookout Orientation
Decking Material
Decking Stagger Bays
Gable Bottom Plate Material
Rafter Tie Material
Collar Tie Material
Collar Tie Drop
Ridge Beam Material
Ridge Beam Plys
Ridge Beam Drop
Ridge Post Material
Ridge Post Plys

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 a CAD tool for generating a building model, plans, bill of materials, and cost estimate from your parameters and materials.

It does not use AI. All code was written manually by its creator.

Currently, it can generate only one story, rectangular structures with either a gable or shed roof.

It's possible to generate designs which are unsafe and don't adhere to proper building codes.

Use at your own risk.

Video: Talk @PTWD

For feedback, email
←Dan at this domain.

Known Bugs

Sun May 24 22:24:56 UTC 2026
  • An opening with impossible header may prevent successful rendition.

Change Log

Fri Jun 19 16:50:54 UTC 2026
  • Gable roof design now generates lookouts.
  • Rafter tail max plumb height now working for gable roofs.
  • Fascia and fly rafter max plumb heights can now be specified.
  • Improved console messages when rendering.
Tue Jun 9 20:25:29 UTC 2026
  • Windows can now be stacked above each other.
Fri May 29 22:10:16 UTC 2026
  • Fixes bug in common stud placement and crippling when overlapping opening.
Fri May 29 04:42:13 UTC 2026
  • Add support for ridge beam posts in gable wall.
  • Improved BOM part grouping, so parts of similar shape are more likely to appear together in same part cut plan.
  • Shed roof now support walls with flat top plate and birdsmouth cut in rafters (instead of top plates sloped to match rafter angle).
  • Gable roofs now include optional collar ties. Ceiling joists renamed to rafter ties.
  • Sheathing now covers gable walls of gable roof.
Sun May 24 22:24:56 UTC 2026
  • Bug fixed regarding loading new design over current one, was resulting in messed up openings.
Sun May 24 00:02:38 UTC 2026
  • Opening X values now describe position of center of opening (previously was left edge of opening for non-percentage values).
  • Opening Z values can now be negative to express distance from top of wall to top of opening.
  • Maximum height above grade of structure is now reported (see top left corner of screen).
Wed May 20 17:08:19 UTC 2026
  • Enclosure dimensions now describe dimensions of exterior of framing (previously included sheathing).
  • Sheathing no longer laps sheathing of adjacent wall. (might add this back as an option later, would be nice especially for thicking sheating that includes insulation layer).
  • Better layout of sheathing and roof decking to ensure edges of wall and roof begin with large panel for greater strength.
  • Sheathing is now optional
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.
Part Details
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The bill of materials will go here
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