Linear metres on every edge, ready for skirting and trim

The perimeter of every room is broken down per edge in linear metres. That is the number you want when you are quoting skirting, beading, scotia, transition strips or any other product priced by the metre. No extra workflow — draw the room and the edge lengths are already there.

Each edge supports a per-edge override. If your scale is slightly off for one wall because of how the architect dimensioned it, or you want to force an edge to a known measurement without re-tracing, you can apply a correction term to that edge alone. The polygon stays intact; only the reported length changes. See the linear metres glossary entry for how the trade uses the number.

The trade convention for skirting and trim is to subtract door openings from the wall-by-wall perimeter — a 5 × 4 m lounge has 18 linear metres of wall but might quote 16.2 linear metres of skirting once two 900 mm doorways are deducted. AreaSum keeps the raw per-edge figure intact so you can do that deduction in the quote rather than burying it in the takeoff. For multi-trade jobs that need separate transitions between flooring types, the flooring transition glossary entry covers the standard products.

Broadloom carpet is also priced by linear metre off the roll, not just by square metre on the floor. The per-edge figure is one input into that conversion; the other is roll width. The carpet broadloom calculator and the carpet cut list calculator both run the conversion once you have room dimensions out of the takeoff.