Assessment of Additional Construction Costs - Have I considered everything?

hmm.. then I was a bit mistaken there. I think I got a little confused, for KFW40+ the system is simply necessary.

If you only want to build the minimum (to save money), there are regulations that can be found with KfW. For 110m², that will be just barely over 2 kWh of battery and a mini photovoltaic system. However, I recommend fully equipping the roof. Even with the currently meager approx. 9 cents / kWh feed-in tariff, the system pays off eventually. But usually, it still runs and the self-consumption is free (except for operating costs). The roof shape / inclination can be optimized for this as long as there are no other disadvantages.

I'm not entirely sure if our numbers are correct, but we have been given costs from the surveyor (binding) of almost exactly 2400 euros in total for the batter boards and the surveying after construction completion. We are building in NRW. That's why I think the 2500 should fit. Or have I overlooked something?

It depends on what is already included in your construction services. Surveying services are often already included.

Normally, however, you have to have an official site plan prepared for your property for the building application (or check whether a non-official one suffices). That alone already costs 2130 euros + VAT (fixed, according to the fee schedule).

Or the property already has a site plan with all elevation details, etc. But this is usually only the case if a building application has been submitted for the property in the recent past.

Aah, O.K. that clarifies a lot. We are building according to the simplified procedure (exemption) there in the new development area with a development plan. We probably don't need it there.

If you only want to build the minimum (to save money), there are regulations that can be found at the KfW. At 110m², that will be just over 2kWh of battery and a mini photovoltaic system. However, I advise filling the entire roof. Even with the current meager roughly 9 cents/kWh feed-in tariff, the system will pay off eventually. But usually it still runs afterward, and the self-consumption is free (except for operating costs). The roof shape / pitch may be optimized for this as long as it doesn't cause any other disadvantages.

Good morning,
that's exactly how I planned it. The roof is to be fully covered and the storage only the minimum to obtain the KFW subsidy.

Anyone who can read is clearly at an advantage... unfortunately, I have to blame myself for that.

I can add the following to my calculation.

The supply lines for rainwater, wastewater, drinking water, electricity, and broadband/fiber optic cables will be laid approximately one meter onto the parcel in question.
Inspection shafts for wastewater and rainwater will also be laid up to about 1 meter on the property.

Fortunately, this reduces my costs by a multiple. I have distributed the saved costs a little to other points.

Also, part of the surveying costs is already included in the purchase contract of the property.

The costs of surveying and transfer into the cadastre as well as the costs of placing boundary stones are borne by the seller, who will arrange the placement of boundary stones in due time.
The costs of building surveying are borne by the buyer.

Where did I increase the costs as a buffer?

[*
Electrical - extras
[LIST]
[*]LAN sockets
[*]Server/switch cabinet
[*]Switch
[*]Wall outlets for outdoor lighting
[*]Lighting fixtures and lamps inside and outside


[*]Drainage planning and implementation
[*]Possibly even a quick starter program for a swift start to the construction work.
[*]I am still considering a building expert and builder’s legal protection insurance.
[*]What I unfortunately have not yet been able to find out is the construction scaffold.

So, these were the current informations on my ancillary construction costs.

Supply must still be laid to the house, 1 meter is only the transfer point from which the costs of the providers are usually calculated.