Read carefully all documentation - eg the Geotechnical report

When we were at Clarendon for the meeting to consider Tender and estimates of costs, we were presented with the geotechnical report on our block of land. This determines what kind of slab is required for your house. Clarendon gives as standard a M class slab but in most cases this needs to be upgraded to a H class slab due to soil condition and trees and so on.
When I read through our report it stated that our block had grasses and numerous trees. but our block was recently mown by myself and had one solitary wattle tree about 2m high in the middle. So I rang the geotech to ask about it.
The difference between a Class P and Class H site:-
He informed me that the Class P which is what my block was rated indicated to the Clarendon engineer that there were things on the block that had to be checked, whereas a class H would not require checking by the engineer.
OK, so where were the numerous trees? He told me that i should take photos and email them to him. And further that a site classification is effected by having trees within 30 meters which could even be saplings and up to 30m high trees.

So I went back to my block to take pictures and found no bore holes for the soil testing that should have taken place. But on the block next door there were the bore holes. THEY HAD BORED THE WRONG BLOCK!
That's why you read carefully and check everything.
Of course now with the block next door having lots of grass and saplings it influences my classification. Clarendon nor the geotech company do not know how long the site next door will be left before being built upon nor if they will keep some of the trees and have 6m trees in their garden. I will still get a Class H slab because the soil type is the major influence. And anyway I want peering under the slab so as to minimise movement.
But what if someone had begun to build on the wrong site!