What the appraiser is actually doing
A licensed, independent appraiser (lenders order through blind panels; nobody hand-picks a friendly one) inspects the home and compares it with recent nearby sales, adjusting for size, condition, lot, and upgrades. In Southern California, where one street can separate school districts and two blocks can separate price tiers, comp selection is the whole game, and local appraisers know it.
Preparing a home to appraise well
Selling or refinancing, the checklist is the same: make every improvement visible and documented. A one-page list of upgrades with dates and costs, permits for finished work, easy access to all rooms and the garage, and basic presentation. Appraisers are professionals, not judges of housekeeping, but documented improvements they cannot see cannot be counted.
When the value comes in low
It happens, especially in fast-moving markets where comps lag prices. Your options, in order: a reconsideration of value with better comps (this works more than people think when the comps are genuinely stronger), renegotiating price with the seller, increasing your down payment to bridge the gap, or switching loan structure. A low appraisal killed none of Jackie's recent purchases; strategy did the saving each time. On refinances, timing the application to your neighborhood's sales cycle can add real appraised value.