Variation Order Generator

Why this interactive tool is unavailable

This tool currently depends on UK-specific tax, law, regulation, standards or source data. A US URL is available so your journey stays in the US section, but the interactive result is paused until a separate American method has been checked.

Builder Tools has disabled the interactive result while the method, source material, assumptions and edge cases are independently reviewed. We will not present an unverified number as a design recommendation. Existing saved results should not be relied on for purchasing, installation, certification or alteration work.

What to do instead

Use the code and official guidance adopted by the project jurisdiction, and ask the appropriate licensed professional or authority having jurisdiction to verify the project-specific decision.

This page explains the review status only and deliberately provides no substitute result.