Just so you know, here comes a layman's opinion and your redactions are pointless ;)
I think there are better conditions. The foundations need to be a bit deeper than the usual 80cm, the house also needs to be set higher because the groundwater is high and the soil stays waterlogged up to the property boundary during rainfalls. Water cannot seep away but must be completely drained from the property. The terrain needs to be shaped because the subsoil is uneven, partly soil has to be replaced. Topsoil is completely missing on the property, you will need to bring it in for planting, especially if the house is set higher. You can replace some of it with the excavation, but topsoil is needed afterwards. Or is it stored somewhere?
Sounds like additional costs. Let me know what Danwood wants to charge for that.