Contact
This is a reading resource rather than a business, and it does not run a contact desk.
Hiring Well
The usual checks are still the ones that matter. Put the same written specification to every firm, so the prices that come back are actually comparable.
Accuracy Over Time
Where a guide is factually wrong, it gets corrected. Standards change, materials are discontinued, and prices move, and a guide that has not kept up is actively misleading rather than merely stale.
Guides, Not Services
Nothing here is an offer of service. Anyone wanting the work carried out needs a contractor, which this site is not.