Terms of use

Educational use

Content is provided for general information and early project planning. It is not a substitute for permits, inspections, engineering, product instructions or trade advice.

No project relationship

Using the site does not create a contractor, designer, engineer, inspector, legal or advisory relationship.

Your responsibility

You are responsible for confirming property rights, rules, safety requirements, professional qualifications and product suitability before work.

Availability

Content and tools may change, move or be withdrawn without notice. We do not guarantee uninterrupted access or error-free calculations.