Alphabetical by name of thing. Please suggest improvements and additions. Note: I change the date whenever I update this, so it will pop up every now and then. Rest assured it's not all new. Big changes will have a post of their own.
Updated for 10. You will see these changes in the templates when you start a project in 10. I figured now is the time to make changes. Nothing too major:
• +Z SK Title is gone. SK titles should be placed in the layout only.
• Most +L layers become +C instead. C=Civil and is more standard.
• +L House Outline becomes +C Footprint.
• Z Light is new, for sun and sky objects for LightWorks rendering.
• We're going to use real section markers:
+Z SE & Detail Object becomes +Z SE Print. Use this layer for sections that print.
+Z S/E Tool becomes +Z SE Hide. Use this layer for junk sections and others you don't want to see in plan. (At the beginning of the project, all the markers are on the hidden layer. Move them to the Print layer as needed.)
• +A Roof Plan Line is gone. Use A Roof2.
| Item | Layer | Note |
| Area Calculation Fill | Z Measurement | Consider zones instead. |
| Baseboard | F Trim Int Lo | |
| Bathtub | P Fixture | |
| Beam, Structural | S Beam | Control 3D/Section display in object settings. |
| Beam, Structural | S Framing | Hidden in 3D. Alternate to setting control above. |
| Bench | A Cabs2 | |
| Bookshelves | A Cabs2 | |
| Bracket | F Trim Int/Ext Hi/Lo/Mid | |
| Builtins | A Cabs2 | |
| Builtin Labels ("Bench") | +A Arch Note Reg Scale | |
| Cabinet | A Cabs2 | To display in Plan & 3D; use thin, dotted line |
| Cabinet | A Cabs3 | To display in 3D only |
| Car; Plan | F Furniture | |
| Ceiling | A Ceiling3 | |
| Ceiling Finish | F Clg Fin3 | Drywall, panels, etc. |
| Centerline Object | +A Arch Note Reg Scale | To display in Plan, otherwise ! Guide |
| Centerpoint Object | ! Guide | |
| Chimney Parts | A Fireplace | To display in Plan & 3D |
| Chimney Parts | A Chimney3 | To display in 3D only |
| Clip Line (Ceiling) | A Soffit2 | |
| Closet Shelf | A Cabs2 | |
| Coffer Beams | A Soffit2 | Use a dotted line for the beam or slab. |
| Column, Decorative | F Trim Int/Ext Mid | To display in 3D only |
| Column, Decorative | F Trim2 | To display in Plan & 3D, not in structure |
| Column, Structural | S Column | |
| Column, Steel in Basement | S Col Steel | To show in Foundation plan |
| Cooktop | A Appl | |
| Counter | A Cabs2 | |
| Crown | F Trim Crown | To display in RCP, otherwise F Trim Hi |
| Cutline, Stair | A Stair2 | |
| Deck Railing | A Deck2 | |
| Deck Railing | A Deck Railing | To hide in Structure Plan |
| Deck Structure | S Deck | |
| Deck Surface | A Deck2 | To display in Plan & 3D |
| Deck Surface | A Deck3 | To display in 3D only |
| Drawing Area (Object) | +Z Drawing Area | |
| Drawing Title | Note layer of drawing type | |
| Driveway (Mesh) | L Drive3 | |
| Elec Fixtures | Complicated. | |
| Elec Fixture Symbols, Wall & Floor | E Fixt2 | To display in Elec Plan |
| Elec Fixtures, Wall & Floor | E Fixt3 | To display in Elec Plan, Int Elevs, Views |
| Elec Fixture Symbols, Ceiling | E Fixt Clg2 | To display in EP, RCP |
| Elec Fixtures, Ceiling | E Fixt Clg3 | To display in EP, RCP, Int Elevs, Views |
| Elec Fixtures, exterior, modeled | E Fixt Ext3 | To display in EP, 1/4" Elevs, Views |
| Elec Fixtures, exterior, ceiling, modeled | E Fixt Ext Clg3 | To display in EP, RCP, 1/4" Elevs, Views |
| Elevator | +A Arch Note Reg Scale | |
| Energy Calculation Fill | Z Measurement | |
| Firebox | A Fireplace | |
| Floor Finish Fills | F Floor Fin2 | |
| Flooring, Finish | F Floor Fin3 | |
| Flue Parts | A Flue | |
| Footing | S Footing | Use a dotted line for the slab. |
| Foundation Perimeter on Site Plan | +C Footprint | |
| Foundation Walls & Piers | S Wall2 | To display in Plan & 3D |
| Foundation Walls | S Wall3 | To display in 3D only |
| Furniture | F Furniture | |
| Gross Area Calc Fill | Z Gross Area | Don't use zones. |
| Gutter | F Gutter | |
| Hearth | A Cabs2 | |
| Hotspot (Drawing Aid) | ! Guide, ! Site Guide | Not needed, use sparingly, reconsider. |
| Hotspot (Plan Alignment) | Archicad Layer | |
| Hotspot (Other Alignment) | Note layer of drawing type | |
| House on Site Plan | +C House Line | |
| Joists, 2D Fill | S Framing | |
| Joists, Modeled | S Framing3 | Non-print; S2 Model only. Optional. |
| Mask Fills, S/E | +A Misc Line | |
| Mechanical Fixtures | M Fixture | To display in 3D |
| Mechanical Fixtures | +M Elec Note | To display in Mechanical Plan only |
| Note Leader | Note layer of drawing type | |
| Note Text | Note layer of drawing type | |
| Object Resources | Z Object Lab | |
| Oven, wall | A Cabs3 | To hide in plan. The cabinet goes on Cabs2. |
| Oven, wall | A Appl | To display in plan. |
| Panels | F Trim Int/Ext Mid | The wall with the panel windows. |
| Panels, trim, in slabs/roofs | F Trim Int/Ext Hi | Hidden in RCP |
| Panels, trim, in slabs/roofs | F Trim Crown | To display in RCP |
| Patches | Layer of patched elements | In S/E, use +A Misc Line |
| Picture (Scanned) | Z Image Scan | |
| Pool | A Deck2 | |
| Rafters, Modeled | S Framing3 | Non-print; S2 Model only. As needed. |
| Refrigerator | A Appl | |
| Roof | A Roof2 | To display in plan & 3D |
| Roof | A Roof3 | To display in 3D only |
| Roof Overhead (dotted) | A Roof2 | |
| Roof Plan Fills | F Floor Fin2 | Almost obsolete; use real roofs! |
| Roof Structure (Thick) | A Roof | |
| Roof, Cutting | X Cutting Roof | |
| Room Name Object (Plan) | +Z Zones | Use zones instead |
| Section/Elevation Elements | +Z SE Print | SE cutters to print, and SE/Detail Objects |
| Section/Elevation Elements | +Z SE Hide | Non-printing SE cutters |
| Shower Head | P Fixture | |
| Shower Pan | P Fixture | |
| Sink, Bath | P Fixture | |
| Sink, Kitchen | P Fixture | |
| Site (Mesh) | L Grade | |
| Site Boundary | +C Site Line.E | |
| Site Contour, existing | +C Contour.E | |
| Site Contour, new/modified | +C Contour.N | |
| Site Contour Labels | +C Site Note | |
| Site Cutting SEO Operators | X Site Cutting | |
| Soffit, Exterior | A Soffit3 | |
| Solid Element Operators | X SEO General | |
| Stair Arrow | +A Arch Note Reg Scale | |
| Stair Newel | A Stair Railing | |
| Stair Railing | A Stair Railing | To hide in Structure Plan |
| Stair Stringer (Wall, Object) | A Stair2, A Stair3 | |
| Stair Tread (Slab, Roof) | A Stair2, A Stair3 | |
| Sun, Sky Objects (Lamps) | Z Light | |
| Switch Path (Electrical) | +E Elec Note | |
| Toilet | P Fixture | |
| Title Block, Main | +A Arch Note Reg Scale | |
| Tree, Model | L Tree3 | |
| Tree, To remain, Symbol | L Tree2.E | |
| Tree, Remove, Symbol | L Tree2.D | |
| Tree, Show in Arch Plan | L Tree A.E | Model or symbol |
| Vanity Top | A Cabs2 | |
| Wainscot | F Trim Int Lo/Mid | |
| Wall Poche Mask | +A Wall Mask | |
| Washer/Dryer | A Appl | |
| Zone for Room | +Z Zones | |