Key points
  • Measure the same surfaces
  • Name method and protection
  • Separate allowances and exclusions

Start with one scope

Give each provider the same measured surfaces, materials, stains, access constraints, and desired result. A house square-foot figure is not automatically the exterior wall area.

Make method visible

Record the proposed pressure, temperature, chemistry, test area, dwell time, rinse, and plant or fixture protection without assuming that a marketing label defines the process.

Close the exclusions

Ask whether water, lifts, recovery, disposal, oil or rust treatment, windows, gutters, sealing, and return visits are included.