1. Published references are not interchangeable estimates
A published reference is a figure reported by an identified publisher with a defined scope. An estimate applies rules to information about a particular project. The current U.S. bathroom tool does not create that kind of project-specific estimate: it returns an exact published scenario and labels it as a national reference.
| Value type | What it means here | What it does not mean |
|---|---|---|
| Published range | A source’s stated lower and upper values for its defined project scope. | A guaranteed interval for every local project. |
| Reported average | An arithmetic average explicitly reported by that source. | A Ramefor average or the midpoint of another range. |
| Reported median spend | The middle homeowner-reported spend in the described study group. | An average, a contractor estimate, or a current price prediction. |
2. Sources remain separate
Angi, This Old House, and Houzz Research do not necessarily measure the same population, project definition, time period, or statistic. Ramefor does not average incompatible ranges, reported averages, or medians. A difference between them can reflect methodology and scope rather than an error.
Each U.S. registry entry stores a stable source ID, publisher, title, URL, the publisher’s publication or update date, Ramefor’s verification date, individual value IDs, scope notes, and a usage limitation.
3. How the bathroom calculator works
The bathroom remodel calculator validates one of four published size bands and resolves that selection through a registered source ID and value ID. It returns the exact This Old House row.
- It does not multiply square feet by a dollar rate.
- It does not interpolate between bands or extrapolate beyond them.
- It does not combine the source with Houzz medians or Angi figures.
- It does not add location, plumbing, labor, permit, quality, or premium-work multipliers without a usable published rule.
Layout and premium/custom answers only add warnings that the selected national scenario may fit poorly. They never change the numeric range.
4. Why a local quote can fall outside a national reference
National references cannot inspect existing plumbing, concealed damage, access, local labor availability, taxes, permits, product specifications, contractor overhead, schedule, or the final written scope. A local contractor may therefore quote below or above a published range without either figure being inherently wrong.
5. Source freshness and reverification
The current threshold is 180 calendar days. Automated checks calculate age from verifiedAt in UTC, not merely from the publisher’s older publication date. This allows a still-relevant source to remain current after Ramefor has reviewed it again.
When a reference exceeds the threshold, tests identify it for reverification. The verification date changes only after the source has actually been checked; the publisher date changes only when the publisher changes it.
6. Corrections and changed sources
If a publisher changes a figure, scope, date, or page, the typed registry, dependent explanation, and tests must be reviewed together. Ramefor corrects the stored value and its visible context rather than silently substituting a different source or blending the old and new values.
Questions about these principles belong with the product’s accountable organization. See About Ramefor for the product’s role and limits.