LotSpec LT

LotSpec LT

Win32 and 64, English

Options Management software for Home Builders. Automatically configure "Lot Specific" plan sets in minutes by selecting Options from a menu.

General Usage Instructions

LotSpec is "Rule Based" Options Management software geared for Home Builders. Within an Autodesk®  AutoCAD® Archtiecture/Autodesk® AutoCAD® MEP project users define a list of building "Design Options" then assign logic or "Option Rules" to individual or groups of objects within project drawings (Elements, Constructs, Views). Once all drawings are complete with Option Rules defined, users can automatically configure "Lot Specific"(aka "Customer Specific" or "Job Start") plan sets in minutes by selecting options from a menu.

LotSpec YouTube Channel 

LotSpec for AutoCAD Demo Project

To get started...

  • Download and install the LotSpec App.
  • Create a new AutoCAD Architecture Project from scratch.
    • Do NOT select a Project Template.
    • Make sure "Use Relative Xref Paths" and "Match Sheet View Layers to View" are both set to "Yes".
  • From the LotSpec ribbon select "Edit Options".
    • Use the Edit Options palette to add Option Groups and Option Selections to your project. Perhaps start by adding 1 Group ("Elevations") with 3 Options with Codes ("elevA", "elevB" & "elevC").
  • Create a new Construct ("1st Floor") assigned to Level 1.
    • Open the 1st Floor Construct and draw a simple 30'x30' floorplan using ACA Wall Objects.
    • Break/Split sidewalls 24" back from front of floorplan allowing the front to be copied 3 times in the negative Y direction (delete the original).
    • Give each of the 3 copied fronts a unique look by adding jogs to the walls or adding Doors and Windows.
    • Next use the Poly Option tool to add a Poly Option around each front elevation design. Give each Poly Option a distinct rule ("elevA", "elevB", "elevC") along with setting the points to move FROM and TO so that walls are back in their original location.
      • Either type "elevA" in "Move If" box to define rule, or select "..." button to use rule builder dialog.
    • Select the "+" on Poly Option panel to show Option Labels.
  • Select "Solve Drawing" from LotSpec ribbon, check only the Elevation A option then hit "Ok".
    • This will copy your 1st Floor Construct, add -SOLVED to the filename, and configure the drawing for Elevation A
    • Close the -SOLVED drawing and repeat for Elevations B & C. Notice the floorplan for each -SOLVED drawing represents selected elevation design.
  • Next create a new View Drawing ("First Floor Plan") and select the 1st Floor Construct as Content.
    • This View is required in order to place floorplan on a sheet.
    • Nothing needs to be done to this View right now, close the file if opened.
  • Select "Solve Project" from the LotSpec ribbon, check only Elevation A, make sure all Project Files are selected on right side, then hit "Ok".
    • This will solve both 1st Floor Construct and First Floor Plan View creating a -SOLVED file in the SOLVED Category under Constructs and Views.
  • Now create a new Sheet Drawing ("A-1 FIRST FLOOR PLAN") and open the file.
    • From the Views tab on Project Navigator, drag the "First Floor Plan-SOLVED" View onto your new sheet.
  • Finally, repeat Solve Project for each Elevation Option, reloading Xref on new sheet after each solve. Notice the floorplan update to match selected elevation design.
  • Repeat these steps creating new Constructs, Views, Sheets and Options for other plans to complete your project.

To convert an existing project, repeat steps above while creating Constructs, Views, Sheets and Options as needed. Copy drawing objects from existing project(s) into Constructs\Views and assign option logic as needed.


Ribbon/Toolbar Icon Command Command Description


Shows information about the current LotSpec version.


Allows user to add/edit Poly Option. For new Poly Options, pick 2 points to define corners of polyline then define Option Rule along with FROM and TO points. Add multiple conditions in order to move objects to alternate locations based on rules. Leave FROM and TO blank in order to create an "Option Nest" to simplify logic on nested Poly Options. Select the Stretch Checkbox to instruct Poly Option to stretch objects instead of move. To edit existing Poly Option enter "E" for Edit, then select polyline. Poly Options are evaluated during solve drawing process with contents of each Poly Option being Moved, Stretched or Deleted accordingly. Note: For irregular shaped polylines first create polyline using typical tools then use E to edit existing polyline.


Solves the current drawing(Element, Construct or View). Prompts user to select Options, Mirror Plan(Yes/No) along with Xrefs to be solved(for Views only). Current drawing(and selected xrefs) are copied to the "Solved Drawing Category" with "Solved Drawing Suffix" being added to file name. Copied drawing file(s) are opened and solved with all Object & Poly Options being evaluated against selected options, drawing mirrored as needed and update of Sections, Elevations and Schedules performed.


Labels all Poly Options in the drawing. An arc and label is drawn for each Poly Option condition showing the FROM and TO points along with Option Rule.


Labels all Object Options in drawing. A multileader with Option Rule is added near each object with an assigned Object Option.


Shows dialog to edit LotSpec Project Settings.


Deletes existing Poly Options labels from drawing.


Adds all option labels to active drawing.


Deletes existing Object Option labels from drawing.


Opens the Edit Options palette for editing available project Option Selections. Use this palette to define Option Groups and Selections, assign Default Options to Groups, and apply Selection Rules to Conflicting Options.


Solves all selected project files (Elements, Constructs and Views). Prompts user to select Options, Mirror Plan(Yes/No) along with all Project Files to be solved. Each selected project file is copied to the "Solved Drawing Category" with "Solved Drawing Suffix" being added to file name. Copied drawing file(s) are opened and solved with all Object & Poly Options being evaluated against selected options, drawing mirrored as needed and update of Sections, Elevations and Schedules performed.


Deletes all option labels from active drawing.


Allows user to assign Option Rule to individual drawing objects. Assigned rules are evaluated against selected options during solve drawing process with objects returning a False result being deleted. When selecting multiple objects, "like" Object Options are grouped and edited together. A selection dialog is shown when multiple distinct Object Options are found. The multiple selection dialog can be used to remove Object Option from object(s) by right-clicking and selecting Remove.


The installer that ran when you downloaded this plug-in from Autodesk App Store has already installed the plug-in. You may need to restart the Autodesk product to activate the plug-in. To uninstall this plug-in, click Control Panel > Programs > Programs and Features (Windows 7/8/8.1/10) or Control Panel > Add or Remove Programs (Windows XP), and uninstall as you would any other application from your system.

Additional Information

Known Issues


Company Name: LotSpec
Support Contact: jalbert@lotspec.com

Author/Company Information


Support Information

For support email jalbert@lotspec.com

Version History

Version Number Version Description


Version: 1.0.18 -Now checking for current open solved drawing before solving. -Added solving dialog during solve process. -Added test rule feature to rule builder dialog. -Now creating selected options CSV files in root project folder when solving (for scheduling purposes on sheets). Version: 1.0.17 -Fixed bug with rule error near double open parentheses. -Fixed bug where object option rule builder deleting rule when hitting cancel. Version: 1.0.16 - 1.0.15 -LotSpec for Autodesk® AutoCAD® changes only. Version: 1.0.14 -Fixed issue with auto save file naming. Version: 1.0.13 -Now deleting "Don't Mirror" lines after solve when mirror not selected. -All LotSpec layers now created as not plottable by default. Version: 1.0.12 -Added regen during solve after all layers turned on to ensure stretch options pick up all objects. Version: 1.0.11 - 1.0.10 -LotSpec for AutoCAD changes only. Version: 1.0.9 -Fixed bug with re-path of data links during solve option sets. Version: 1.0.8 -LotSpec Server updates only. Version: 1.0.7 -Revised ribbon layout -Added top level menus where right-click functions available


Revised LotSpec LT Ribbon Ensure compatibility with "Linked Options" in LotSpec for AutoCAD Added Codes to Option Groups for use in Rules


Fixed crashing during solve process caused by AutoCAD® 2018.1 update.


Minor changes to LotSpec LT ribbon.


Renamed App from "LotSpec" to "LotSpec LT" Support for LotSpec for Autodesk® Revit® Support for LotSpec for AutoCAD File and Text Options


Fixed bug with anchored Tags (and other non-hosted anchored AEC objects) not moving with Poly Option during Solve Process.


Support for Autodesk® AutoCAD® Architecture® 2018. Support for LotSpec Pro Style & Property Options. Minor User Interface changes.


Initial release
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