ᐅ Shell construction company builds basement smaller than in the approved building plans

Hello everyone,

A shell construction company was commissioned to build the basement with in-situ concrete according to the existing factory plan (14.0 x 6.66 m (46 ft x 21.8 ft)). However, the company missed the dimensions and built the basement about 4 cm (1.6 inches) smaller. This applies to both the exterior and interior measurements.

Dimensions according to factory plan
Target house width: 6.66 m (21.8 ft)
Target width of basement concrete walls exterior: 6.525 m (21.4 ft)
Target width of basement concrete walls interior: 6.025 m (19.8 ft)

Actual width of basement concrete walls exterior: 6.48 m (21.3 ft) (-0.04 m (-1.6 inches))
Actual width of basement concrete walls interior: 5.96 m (19.6 ft) (-0.06 m (-2.4 inches))

I measured myself using various tape measures and a laser distance meter.

What should be done in this situation?
Price reduction due to smaller total area? If so, how much? Are there any standard tables or guidelines for this?

It is especially unfortunate that the house was built smaller on the narrow side (maximum size restricted by the zoning/land-use plan), where every centimeter counts.
This also has consequences such as the possible need to adjust the factory plan (staircase, adjacent walls, support columns no longer fit).

Best regards

Just to be clear: You want compensation over a 1% deviation and are worried you might have to redo all the planning?

"What is the difference between a draftsman, a concrete worker, and a bricklayer? – The draftsman works in millimeters – the concrete worker in centimeters – and the bricklayer is happy just to stay within the property line!"

Basement (KG) and ground floor (EG) floor plans are attached.

SoL schrieb:

Just to clarify: You want compensation due to a 1% deviation and are worried about having to replan everything?

I want to clarify the legal situation.
As far as I know, 4–6 cm (1.6–2.4 inches) over 6.66 m (21.85 feet) is beyond the acceptable building tolerance.

For acceptable tolerances, refer to DIN 18202, and yes, deviations of 4–6cm (1.5–2.5 inches) are too large. However, no one will pay for a demolition because of this, and significant compensation is unlikely. The stair builder will come to take measurements anyway and will build according to the actual dimensions on site. He knows that the rough builders are not very precise, and that a layer of plaster of 1–3cm (0.4–1.2 inches) will be added to the walls, depending on the masons’ accuracy and the plasterer’s mood 😉

domino55 schrieb:

A shell construction company was commissioned to build the basement from in-situ concrete according to the existing factory plan.

Who put the project out to tender, who commissioned it, and who are you exactly (owner, buyer)?

The drawing refers to the neighboring building on one side as existing, but it seems to me that it actually means the simultaneously constructed "opposite semi-detached house." One and a half centimeters (sheet ???) of insulation in between will never perfectly match between planned and actual conditions; the neighboring house would have to be built by watchmakers for that to happen.

We know far too little about your construction project to give detailed advice. Honestly, I also get the impression that you are looking for support in calculating a discount request.

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