A low headline price is not always the lowest complete project cost. Use WattCostLab to compare scope, permits, electrical work, warranties, commissioning and exclusions across home-energy quotes.
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Each project has a different cost structure. Use the right checklist before comparing totals.
System size, roof work, inverter, interconnection, electrical upgrades and storage.
Solar cost guide →Load sizing, ductwork, electrical capacity, controls, backup heat and commissioning.
HVAC replacement guide →Circuit length, panel capacity, trenching, permits, charger hardware and commissioning.
EV installation guide →Panel versus full service upgrade, utility coordination, meter equipment and grounding.
200 amp guide →Equipment, electrical or gas work, venting, condensate, plumbing changes and removal.
Water heater guide →Product performance, installation method, air sealing, prep work, cleanup and warranty.
Efficiency guides →Enter prices and mark what each contractor includes. WattCostLab summarizes documented scope without pretending to choose the contractor for you.
Open quote comparisonBuild one household electrification budget, add contingency and incentives, and estimate simple payback from your own savings assumption.
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