Quickly estimate value from the neighborhood reference average with floor, orientation, renovation and age adjustments.
以同小区参考均价为基准，叠加楼层、朝向、装修、年限等修正系数，快速估算房产价值
市场比较法：以近期同小区成交均价为基准，根据个体差异叠加修正系数。
评估单价 = 参考均价 × 楼层系数 × 朝向系数 × 装修系数 × 学区系数 × (1 + 其他修正%) × 房龄折损
房龄折损：每年约折损 0.5%（封顶 20%）
评估总价 = 评估单价 × 建筑面积
注：本工具为快速估算参考，实际交易价格受市场行情、楼层户型、税费、谈判等多因素影响，请以专业评估机构报告为准。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Sales-comparison adjustments | Adjusted price = comp × conditions × date × location × property factors | GB/T 50291-2015 Valuation Standard |
| Comparable requirements | Comps must be nearby, recent (≈within 6 months) and arm's-length | GB/T 50291-2015 Chapter 4 |
| Adjustment limits | Single adjustment ≤15%, cumulative ≤25% (guidance values) | GB/T 50291-2015 explanatory notes |
| Final value | Average or median across comps, weighted by comparability | Valuation-report practice |
二手房评估工具采用市场比较法，以同小区参考均价为基准，叠加楼层、朝向、装修、房龄、学区等多维修正系数，快速估算房产价值。