Civil Engineering – Projects and Qualified Teams

Civil engineering covers all work below ground level: earthworks, excavation pits, trenches, house connections for water, power, and telecommunications, sewerage, drainage, backfilling and compaction, retaining and angle walls. The trade comes at the start of every construction project and is the prerequisite for buildings, roads, and paving work. Key requirements are observing soil classes per DIN 18300, proper shoring of trenches deeper than 1.25 m (protection against collapse), correct layered compaction, and exposing and protecting utility lines. Example Germany: ATV DIN 18300 (earthworks), DIN 4124 (excavations and trenches), the EUB guidelines, and BG BAU accident prevention rules on shoring and safety apply.

FAQ

How much does civil engineering cost per m³ or lm as subcontracted work?

Which soil class needs which effort?

From what depth is shoring mandatory?

Which compaction for which use?

Which permits and notifications are required?

How long does a house connection take?

How much does civil engineering cost per m³ or lm as subcontracted work?: Example Germany: excavation soil class 3–5 8–20 €/m³, backfilling with compaction 12–25 €/m³, sewer trench with shoring 80–180 €/lm at 1.5–2.5 m depth, water connection 1,500–4,000 € flat rate, drainage at building 40–80 €/lm. In Poland typically 30–40 % below German rates.
Which soil class needs which effort?: Example Germany per DIN 18300: BK 1 topsoil, BK 2 flowing, BK 3 easily extractable (sand, gravel), BK 4 moderately (loam, marl), BK 5 difficult (firm rock, dense loam), BK 6/7 easily/hard rock. Higher class = greater machine and time effort.
From what depth is shoring mandatory?: Example Germany: from 1.25 m per DIN 4124 shoring or sloped excavation is mandatory. Vertical walls up to 1.75 m with timber shoring, from 2 m with sheet piling or Berlin shoring. Slope angle 45° (loose) to 80° (rock). Safety takes precedence over cost.
Which compaction for which use?: Example Germany: base course under paving and concrete DPr ≥ 100 % (Proctor), backfill against components DPr ≥ 95 %. Layered compaction with vibrating roller or rammer, max. 30 cm lift height. Water-permeable materials (crushed stone, gravel) preferred to prevent settlement.
Which permits and notifications are required?: Example Germany: excavation in public areas (road, pavement) requires municipal permit. Utility lines must be located before excavation via plan inquiry with all utilities (power, gas, water, telecom). Larger interventions: building permit and stability certificate.
How long does a house connection take?: Example: water/sewer/power connection for a single-family house with 15 m trench to the road: 2–4 working days for excavation, laying, shoring, backfilling. Plus 4–8 weeks lead time for permits and utility appointment. Weather-dependent (frost stops work).

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