ᐅ Cost Support Using L-Shaped Concrete Blocks

Hello,

Since our carport driveway would probably be too steep if we build the carport level with the house (or with the adjacent room used as a "basement replacement"), we want to position it lower, at street level in this location. The height difference to the "basement room" would be about 75cm (30 inches) at most. Could this be supported with (proven) L-shaped retaining walls over a length of around 5m (16 feet), and if so, what costs might be expected, including for the foundation of the walls?

We would not connect the carport directly but place it about 2m (6.5 feet) away, so the necessary stairs would not be within the actual carport area, while also creating a strip where, for example, trash bins or a bicycle could be stored. I hope my explanation is clear?

You can also build a 5 meter (16 ft) long and 75 cm (30 in) high structure yourself using attractive anthracite-colored hollow blocks. I managed to do about 25 meters (82 ft) for 3,000 €.

I believe 75 cm (30 in) high L-shaped blocks do not have reinforcement inside. However, you can't move them by hand, so you always need heavy equipment or a company for that.

We paid for the materials including installation in the summer:
L-shaped concrete blocks 1m x 1.55m (3ft 3in x 5ft 1in): €327
L-shaped concrete blocks 1m x 1.80m (3ft 3in x 5ft 11in): €440
L-shaped concrete blocks 1m x 2.05m (3ft 3in x 6ft 9in): €490

These are gross prices. The work was carried out by our structural builder.

HilfeHilfe schrieb:
You can also build a 5-meter (16.4 feet) long and 75 cm (30 inches) high wall yourself using attractive anthracite-colored hollow blocks. I managed about 25 meters (82 feet) for 3,000 €.

I believe 75 cm (30 inches) high L-shaped blocks don’t have reinforcement inside. However, you can’t move them by hand—you’ll always need heavy machinery or a company.

We definitely don’t want to build it ourselves, because the foundation of the room, which is connected to the main house (a shared concrete slab), needs to be properly supported... professionals should handle that. We don’t want cracks or anything like that after a short time.
Is it possible to get enough stability with hollow blocks?

anat79 schrieb:
We paid for the materials including installation in the summer:
L-shaped concrete blocks 1m x 1.55m (3.3ft x 5.1ft): €327
L-shaped concrete blocks 1m x 1.80m (3.3ft x 5.9ft): €440
L-shaped concrete blocks 1m x 2.05m (3.3ft x 6.7ft): €490

Prices include VAT. The work was carried out by our shell builder.

Ah, okay, thank you very much. If similar prices are charged here, it should be financially feasible, which is good. We have a meeting with the architect from the construction company directly at the site on Tuesday... let’s see what he says.

anat79 schrieb:
We paid in summer for the materials including installation:
L-blocks 1m x 1.55m (3.3ft x 5.1ft): €327
L-blocks 1m x 1.80m (3.3ft x 5.9ft): €440
L-blocks 1m x 2.05m (3.3ft x 6.7ft): €490

These are gross prices. The work was done through our shell construction contractor.

I am already paying quite a lot for my L-blocks (in the Nuremberg area), which I am currently having installed (with reinforcement, 12cm (5 inches) thick, with foundation and installation). But from 1.55m (5.1ft) height upwards, they really overcharged you.

- L-blocks 1m x 0.80m (3.3ft x 2.6ft) = €190 net, €226 gross
- L-blocks 1m x 1.05m (3.3ft x 3.4ft) = €211 net, €251 gross
- L-blocks 1m x 1.30m (3.3ft x 4.3ft) = €229 net, €272 gross
- L-blocks 1m x 1.55m (3.3ft x 5.1ft) = €248 net, €295 gross
- L-blocks 1m x 1.80m (3.3ft x 5.9ft) = €290 net, €345 gross

For 5m (16.4ft), that doesn’t hurt much, but if, like me, you need to install 63m (206.7ft) of L-blocks at a height of 1.3m (4.3ft), the costs add up quickly.

If you measured 75cm (30 inches) yourself, you will end up with 1m (3.3ft) L-blocks considering excavation, leveling, and foundation work.