How we compare

We have not tested these; we compare published specs and independent sources.

Criteria before rankings

A comparison states the criteria that matter for the decision. For buildings this can include the shell, base requirement, roof, floor, access, openings, usable layout, treatment and assembly. Every specification needs a maker source and checked date. Our head-to-head comparisons put the criteria in a table before giving a verdict.

We do not use star ratings, Review schema, copied retailer claims or a winner chosen to fit an affiliate programme.