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Design
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Most units are inches.
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 NonGable
Adjust Top Gable
Adjust Bottom
Roof
Roof Type
Slope (degrees)
Eave Projection
Birdsmouth Seat Depth
Rafter Material
Rafter OnCenter
Rafter Tail Max Plumb Height
SubFascia Material
SubFascia Max Plumb Height
SubFascia Material Max Len
SubFascia Splice On
SubFascia Drop
Fly Rafter Material
Fly Rafter Max Plumb Height
Fly Rafter Material Max Len
Lookout Material
Lookout Orientation
Top Plate Orientation
Gable Bottom Plate Material
Rafter Tie Material
Collar Tie Material
Collar Tie Drop
Hip Rafter Material
Hip Rafter Plys
Hip Rafter Drop
Align Rafters with Studs
Ridge Beam Material
Ridge Beam Plys
Ridge Beam Drop
Ridge Post Material
Ridge Post Plys
Decking Material
Decking Stagger Bays
Floor
Floor Type
Decking Material
Joist Material
Joist Max Span
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 Pocket Bearing
Girder Pocket Gap
Girder Max Span
Girder Ply Max Len
Pier Diameter
Pier Height
Pier Depth
Pier Material
Post Material
Girder Material
Girder Max Span Exterior
Girder Max Span Interior
Girder Plys
Girder Ply Max Len
Joist Over Girder Cantilever
Girder Over Pier Cantilever
Bracket Length
Bracket Standoff
Bracket Part
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 lists.
Known Bugs
Wed Aug 19 00:34:51 UTC 2026
- BOM part plans sometimes display poorly rotated parts causing difficultly in measuring lumber and often causing associated lumber material to be "Unknown".
- Openings above openings not fully supported -- framing intersects other window.
- An opening with impossible header may prevent successful rendition.
Change Log
Fri Aug 21 04:04:57 UTC 2026
- Better phone support.
- Improves part edges in 3D client.
- Adds hip roof support (still a work in progress).
- Concrete foundations can now be generated with central girders to support long floor joists.
- 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.
- Windows can now be stacked above each other.
- Fixes bug in common stud placement and crippling when overlapping opening.
- 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.
- Bug fixed regarding loading new design over current one, was resulting in messed up openings.
- 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).
- 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
- Adds fancy incremental reveal of parts for initial load of 3D model.
- Simplifies gable end wall, no longer employs top and bottom plates in triangular portion of wall.
- New code for sheath staggering
- Adds "skid" foundation type (aka girder only).
- Fixes pier foundation bugs regarding cantilever, and now allows negative cantilever.
- Fixes some lookout and subFascia bugs.
- 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.
- Better BOM scaling, and dimension label positioning.
- Adds concrete foundation type.
- X Positioning of opening supports mutliples and percents.
Part Details
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