Begin with a room-by-room heat load to size loops, manifolds, and heat sources correctly. Document zones, square footage, target temperatures, and design conditions relevant to your province. Decide where radiant complements, replaces, or integrates with existing systems. A precise scope prevents oversizing, avoids cold spots near exterior walls, and sets clear expectations for installers, making quotes comparable and avoiding costly mid-project changes.
Break out tubing or cables, manifolds, pumps, boiler or heat pump, controls, insulation, vapor barrier, underlayment, self-leveling compounds, and finish-floor work. Separate demolition, waste disposal, and electrical upgrades from hydronic or electric components. Include permit fees and commissioning time. When materials and labor are itemized, you can evaluate substitutions, value-engineer details without sacrificing performance, and ensure bids actually reflect the same scope and quality standards.
Set a contingency of 10–20% for retrofits where subfloor surprises and height transitions are common. Consider phasing—starting with bathrooms or main living areas to spread costs and learn from the first zone. Time installation before floor finishes to reduce labor. This approach manages cash flow, ensures lessons improve later phases, and creates confidence that comfort and efficiency goals remain intact as the project scales.
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