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Most surveys are done by field visit, not looking at street view images
As far as deciding 1 or 2 stage , it depends on what already exists and observed at survey, for example, overhead , usually single stage , but if ( for example ) the location of the fixing at the property we’re above a flat roof , current rules would dictate a hoist , or possibly a 2 stage install ,(scaffold , movable platform, etc ) is required, so neighbouring property’s, one could be single stage yet next door is 2 stage.
An underground duct service area , if the existing duct can be verified as usable , single stage , where the duct hits the property is unclear ( a building extension now covering the existing duct for example) a 2 stage , the surveyor would pick the appropriate solution.
In some cases ( DIG estates where no duct exists to properties) new civils job is planned to provide new infrastructure .
Planning ( the creation of job packs from the survey returns ) can be done anywhere , and offshore is the norm
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