As-Built Surveys verify compliance with approved design plans and provide a legacy record for both internal and external use. Frequently, as built surveyors will use precise lasers to determine the measurements. They use these measurements to create a rendering that shows the exact layout and dimensions of the building. Along with the survey you should be considering your punch list to make sure everything actually gets done. As-Built Surveys are necessary during progressive phases of the construction process. This monitors the correct building of the structure as it occurs. Project managers may use this precise information to extend deadlines or.