ᐅ Offer for Earthworks and Foundation Slab

Hello everyone,

Our construction project is progressing, and now that we have the soil report and the building permit / planning permission has been submitted, we have received an initial quote for the earthworks (foundation slab). Additional quotes have been requested.

Despite extensive online research, we are unsure whether this is a good offer or if any important items might be missing. It would be great to receive some feedback to better assess it. The listed unit prices are net amounts.

1. Site setup
€450 (flat rate)
2. Profile-appropriate soil loosening – 75m3 (99 cubic yards)
€337.50 (unit price €4.50)
3. Removal and proper disposal of soil class Z0 – 150 tons (165 tons)
€1,854 (unit price €12.30)
4. Contingency item: Removal and proper disposal of soil class Z1.1 – 1 ton (1.1 tons)
€23.80
5. Creation of a soil planum on the base – 150m2 (1,615 square feet)
€270 (unit price €1.80)
6. Delivery and installation of a sub-base layer of HSK 0-45 – 75m3 (99 cubic yards)
€2,970 (unit price €39.60)
7. Creation of a fine planum – 150m3 (196 cubic yards)
€270 (€1.80)
8. Delivery/installation of an inspection shaft up to 2.00m (6.6 feet) depth including earthworks
€950 (flat rate)

Total: €8,440.08 (€7,092.50 net)

Final billing will be based on actual measurements and weight tickets. All additional work can only be charged based on actual effort.

This last point makes us a bit cautious. Of course, we understand that the m2 and m3 figures are only estimates from the plans and may vary, but what kind of additional work might this refer to, and what further costs could we potentially face?

Thank you very much in advance for your help.

Best regards and have a nice Sunday!

Are you sure about the Z0 classification? For the disposal of more than 100 tons (100,000 kg), soil analysis might be necessary.

Marvinius schrieb:
Are you sure about the Z0 classification? For the disposal of more than 100 tons, a soil analysis might be required…

The soil report states the following:
Based on the chemical analyses conducted to determine the LAGA classification, the existing fill soils are classified as category Z1.1, while the naturally occurring soils fall under category Z0.

I understand this to mean that both types are present, and the quote likely only includes an estimate or uses the Z0 classification because it is significantly cheaper to dispose of?

In position 4, you have the price for 1 ton of Z1.1 as a provisional item. You really need to check which category your excavation falls into. Is there perhaps a drawing in the soil report? Can you possibly store the excavated material on the property?

On the other hand, your prices for waste disposal and the inspection chamber are somewhat lower than ours...

Marvinius schrieb:
In item 4, you have the price for 1 ton Z1.1. listed as a required item. You really need to check which class your excavation material falls into. Is there maybe a drawing in the geotechnical report? Can you possibly store the excavation material on the property?

Ok, thanks very much already.

What advantage would it bring us to store the excavation material on the property? The report states that it is likely not reusable. Also, I am not quite clear on how the two classes can actually be separated during the work. Probably that’s not possible and you pay the higher price by default?

At the end, there is a drawing, but it only shows how deep this fill soil is and when the next layer starts. There is nothing about the classes.

So, to make more precise estimates, would we need to have another investigation done to classify the excavation material exactly?