VERT / GREEN
Product, quantity and availability date are coordinated with installer.
Owner-supplied materials: who is responsible for what?
Write down who selects, measures, orders, transports, stores, absorbs waste, handles returns and carries warranty before saving on supply.
JAUNE / YELLOW
Purchase savings can shift measurement, delay, damage or warranty risk to the owner.
ROUGE / RED
Incompatible, insufficient or non-compliant product: do not force installation; clarify responsibility and change in writing.
Checkpoint before proceeding
What the professional checks
Contractor and owner define in writing the boundaries for supply/install, measurement, storage, waste, returns, schedule and warranty.
Sources and references
Vérifié / checked: 2026-08-23
Related path
Continue with the right tools
These links connect this page to the next useful checks and decisions without repeating the full content.
Build a project budgetBreak down labour, materials, equipment, permits, overhead and contingency.Open →Compare contractor quotesCompare scopes and exclusions instead of only the final total.Open →Review material pricesFilter dated observations and compare prices on a common basis.Open →Escalate an older costUse two values from the same official series to update an amount.Open →Compare renovation returnsTest costs, savings, service life, added value, NPV and ROI.Open →
V16
Advanced diagnostics to cross-check
V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.