Here's an example of that: when I built a house, we had the following characteristics:
1 A geotechnical exclusion zone at the front of the house whose exact location was unknown.
2 Three strange angles (one for solar access, two marking out the block size) making measurement tricky thus tricky locating the exclusion zone.
3 A brick house base and a steel frame to go on top. There was 5 centimetre tolerance for the location of the steel beams.
Get #1 wrong, and start building all over again.
Get #3 wrong, and it's time to re-fabricate the frame.
Could have been costly. Went well but took a lot of care, attention and coordinating across 5 groups of contractors.
As a side note, one of my occasional hobbies is performing super-sketchy surveying methodology. It turned out that my extermely non professional, totally un-certifiable methodology was within 10cm of the actual exclusion zone (whose length is around 10 metres from the front of the block of land).
1 A geotechnical exclusion zone at the front of the house whose exact location was unknown. 2 Three strange angles (one for solar access, two marking out the block size) making measurement tricky thus tricky locating the exclusion zone. 3 A brick house base and a steel frame to go on top. There was 5 centimetre tolerance for the location of the steel beams.
Get #1 wrong, and start building all over again. Get #3 wrong, and it's time to re-fabricate the frame.
Could have been costly. Went well but took a lot of care, attention and coordinating across 5 groups of contractors.
As a side note, one of my occasional hobbies is performing super-sketchy surveying methodology. It turned out that my extermely non professional, totally un-certifiable methodology was within 10cm of the actual exclusion zone (whose length is around 10 metres from the front of the block of land).