The terms are often used loosely. The practical difference is the level of structure, classification and professional formality around the measured quantities.
A quantity take-off extracts measurable construction scope from drawings. It may list areas, lengths, volumes or counts by trade and can include notes about assumptions and exclusions. Its main purpose is to provide a measured basis for estimating or quote comparison.
A formal bill of quantities usually goes further. It can classify and describe work in a structured bill, often using defined measurement conventions, so tenderers can price against a common document. Depending on the purpose, it may be prepared by a quantity surveyor or other suitably qualified professional.
If the task is early residential pricing, checking one trade quote or establishing approximate material quantities, a practical take-off can be enough. If the document is being relied on for formal tender comparison, financing, claims, dispute work or another purpose requiring professional certification, a more formal BOQ or QS service may be appropriate.
MeasureBuild provides high-level residential quantity summaries with scope notes, assumptions and exclusions. It is designed for pricing support and scope review. It does not present the standard service as a certified QS bill of quantities.