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MaterialsEstimator
Every tool

Groundwork and paving

Everything that gets poured, compacted or laid on the ground

Floors

Inside, from the subfloor up

Walls and ceilings

Board, paint and what goes behind them

Roof and exterior

The outside of the building and the water coming off it

Outdoor structures and landscape

Decks, fences and everything green

Sizing the systems

Heating, cooling and hot water

Framing and carpentry

Cut lists, layout and the code that constrains them

Measuring and costing

The tools that feed every other one

Appearance

How this is worked out

Trust

Corrections

When a number here turns out to be wrong, it is not quietly edited. It is published: what it said, what it says now, how it was found, and how far off it was.

Maintained by Pablo Ruiz Quintero · Last reviewed 2026-09-16

Nothing to report yet

This log is empty because the site is new, not because it is perfect.

It is published empty on purpose. A corrections page that appears after the first mistake is a page someone decided to write; one that exists from the first day is a commitment made before there was anything to hide. When the first entry lands, there will be no decision to take about whether to log it.

What counts as a correction

A figure that was wrong, a formula that was wrong, or a default that was wrong for the case it was applied to. Anything that would have changed what you ordered or what you expected to pay.

Routine updates are not corrections — a price that moves because the market moved, or a dataset that publishes a new year, goes in the changelog instead. The difference is whether the old number was wrong at the time it was published, or simply old.

How to report one

Name the page and the number. If you can, say what you think it should be and why — a data sheet, a code clause, a supplier quote. We will check it against the source and, if it is wrong, it appears here with the date it was fixed.