How to Use the Offset Tool in SketchUp (F)

Pressing F activates the Offset tool, which creates a parallel copy of a selected face's or edge loop's outline at a specified distance inward or outward — mathematically exact at every point along the boundary, including around curves and corners, which is genuinely difficult to replicate by hand with any other tool. **Basic usage**: with the Offset tool active, hovering over a face highlights it, and clicking and dragging either inward or outward creates a new, parallel outline at whatever distance you drag to — dragging inward shrinks the outline within the original face's boundary, dragging outward expands it beyond the original boundary. **Getting an exact offset distance**: typing a specific numeric distance immediately after starting the drag and pressing Enter overrides the freehand drag with that precise value, the same Value Control Box pattern used throughout SketchUp's other tools — essential for tasks like creating a wall of an exact, specified thickness rather than an approximate one. **The classic use case: turning an outline into a wall**: offset a floor plan's outer boundary inward by your intended wall thickness, which creates a new inner outline running parallel to the original at a uniform distance everywhere, including around any corners or curves in the original shape. Select the resulting ring-shaped face between the original outline and the new offset outline, then Push/Pull that ring upward to create actual three-dimensional wall geometry with a precisely controlled, perfectly consistent thickness on every side — a two-tool combination (Offset then Push/Pull) that's one of the most common and useful sequences in architectural SketchUp modeling. **Why this beats manually drawing a second outline**: attempting to manually draw a second, smaller outline by eye at what looks like a consistent distance from the first is genuinely difficult to get right, especially around curves or non-rectangular corners, where the true mathematically correct offset distance perpendicular to the boundary isn't the same as simply moving each point inward by the same straight-line amount. Offset calculates the geometrically correct result automatically, handling curves and irregular corners with the same precision as straight edges. **Offsetting an edge loop that isn't a closed face**: Offset also works on a series of connected edges that don't form a closed face, producing a parallel line at the specified distance rather than creating a new bounded face — useful for tasks like adding a border line alongside an existing path without needing that path to already be a closed shape. **Related tools**: Push/Pull (P), covered in its own action page, is the natural next step after most Offset operations, since Offset alone only creates flat 2D geometry — turning that offset ring into an actual wall or frame with real thickness in three dimensions requires extruding it afterward. **Mistake to avoid**: offsetting outward on a shape with tight interior corners can sometimes produce self-intersecting or overlapping geometry at those corners if the offset distance is large relative to the corner's own tightness — SketchUp generally handles this reasonably well automatically, but it's worth visually double-checking the result at complex corners rather than assuming every offset distance will produce clean, non-overlapping geometry regardless of the original shape's specific proportions.