Research method

How At-Cost will publish project cost data

The privacy, sample, field, and versioning rules that must be met before At-Cost publishes completed-project cost observations.

Author: By At-Cost Roofing editorial team
Editorial review: Organization editorial review complete
Dates: Published August 31, 2026 · Updated August 31, 2026

Official records, labeled calculations, and evidence limits follow our editorial methodology.

Define one completed-project record

A usable record needs the market and completion period; measured roof area; roof system; removal and deck scope; supplier, crew, permit, equipment, approved-change, and facilitation amounts; and a clear status showing that the project reached closeout. Planning ranges, abandoned estimates, claim allowances, and unpaid proposals do not become completed-project costs.

Remove identifiers before analysis

Names, street addresses, contact information, contract numbers, photographs with identifying details, free-text notes, and rare combinations that could point back to one household stay out of the analysis table. De-identification is a risk-management process, so the fields and combinations must be reviewed again before each release.

Disclose the sample and exclusions

Every published table should name its date range, geography, included roof systems, sample size, unit, calculation, and excluded records. Small groups should be combined or withheld when they risk identifying a project or when one unusual job would make the result misleading.

Separate description from prediction

A completed-project median or distribution describes the qualifying sample; it does not quote another house or predict a future price. Product, market, measurement, access, permit, deck, flashing, ventilation, supplier, crew, and timing differences still belong in the new property's written scope.

Version the result instead of silently changing it

A release should carry a publication date, dataset cutoff, method version, field definitions, correction history, and responsible reviewer. Later jobs create a new version. They should not rewrite an older observation without leaving a record of what changed and why.

What this method does not establish

There is no At-Cost project benchmark on this page today. The method is published first so future numbers cannot appear without a traceable population, privacy review, calculation, date range, and limitation statement.

Common questions

Answers to check before you decide

What does How At-Cost will publish project cost data provide?

At-Cost tool summary: The privacy, sample, field, and versioning rules that must be met before At-Cost publishes completed-project cost observations.

What does this page not replace?

At-Cost methodology boundary: it does not replace a property measurement, current official requirement, named product instruction, or written project proposal.

Editorial method

At-Cost Roofing editorial team

At-Cost separates official source material, local public records, transparent calculations, and approved operating facts. We label illustrative arithmetic, correct the reviewed record when evidence changes, and do not infer project outcomes, local availability, or customer experience from product literature. The At-Cost Roofing editorial team completed the recorded editorial review before publication.

Read the editorial methodology

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