How Much Lumber Waste Should You Allow?
There is no single correct lumber-waste percentage. Waste depends on the quality of the stock, project complexity, cut layout, grain direction, defects and how selective you need to be.
What creates waste?
Common causes include knots or checks, end trimming, saw kerf, tear-out, mistakes, grain matching, short offcuts and the need to straighten or square a board. Sheet goods have similar issues because cuts may leave unusable strips or small corners.
A practical starting point
For a simple construction-style project, a modest allowance may be enough. For furniture, face frames, visible panels or projects requiring matched grain, you may want a larger cushion. The important point is to choose the percentage deliberately rather than automatically using the same number for every job.
Waste is not the same as inefficiency
If your cut plan produces a large amount of avoidable scrap, increasing the waste percentage only hides the problem. Re-arranging the cut order or choosing a different stock length can often save more money than shaving a few percentage points off the allowance.
Budget with MakeGauge
Use the Lumber Cost Calculator to compare a base estimate with a waste-adjusted estimate. Then use the lumber planning guide to work backward from your cut list.