Single-family house assessment 170m² - construction cost overview underestimated?

Hello everyone,

I have an offer from an architect (in-house architect of a construction company).

The plot is available (slope location) - planned single-family house with approx. 170m² living space.

The cost overview seems a bit low to me. What is not considered here? Could there be additional costs? Please help me:

Shell construction works
Scaffolding work 4,000.00
Earthworks 13,500.00
Masonry including clinker 58,000.00
Reinforced concrete work 52,000.00
Total shell construction works 127,500.00
Interior finishing works
Carpentry and timber construction works 8,500.00
Roof covering 8,500.00
Roof windows with shutters 2,500.00
Plumbing work 7,500.00
Thermal insulation of roof and
Cladding of the roof interior 6,500.00
Garage roof waterproofing 1,800.00
Metalworker work 2,500.00
Plaster and stucco work 12,500.00
Tiling and wall panel work 3,000.00
Screed work 2,500.00
Floor covering work 11,000.00
Heating, gas, water, wastewater installation 22,000.00
Solar system 7,500.00
Electrical installations 11,000.00
Ready-made windows with shutters 17,000.00
Front door 2,500.00
Garage door (up-and-over door) 700.00
Ready-made door elements 2,500.00
Total interior finishing works 130,000.00
Shell + interior finishing 257,500.00
Outdoor facilities

Garden facilities 3,000.00
Terrace 1,800.00
Pathways 3,000.00

Total outdoor facilities 7,800.00
Incidental construction costs

Architect / engineer services 5,000.00
Surveying costs site plan 2,000.00
Fine staking out 800.00
Building location measurement 1,100.00

Total incidental construction costs 8,900.00
House connection costs
Gas 2,500.00
Water 2,500.00
Wastewater 4,200.00
Electricity 2,400.00
Telecom 600.00
Total house connection costs 12,200.00
Total construction costs 286,400.00
Plot costs
Plot 500m2 x €195.50 97,750.00
Acquisition costs, notary, etc. 8,400.00
TOTAL COSTS 392,550.00

Well, in my opinion everything is set too low. For the house I would have estimated around €325,000, but without knowing the equipment and the region. If the company builds it for you for that money and everything is included – very good price. Outdoor facilities way too low, especially due to the hillside location. Additional construction costs too low. Edit: Is the garage also included in the price? I would also like to build with them if that works [emoji6]

Well, in my opinion, everything is set too low. For the house, I would have estimated around €325,000, but without knowing the equipment and region. If the company builds it for that money and everything is included – very good price. Outdoor facilities far too low, especially due to the hillside location. Additional construction costs too low.

Thank you very much for your assessment. The equipment is "standard" .. so no upscale extras.

Do you think something has been forgotten here? Or is it presented as "move-in ready"?

Region is Wuppertal / Remscheid

Well, I'm not really an expert either, I only know the numbers for our construction. At first glance, it doesn't look like anything is missing to me, but the respective amounts are very low. Painting is probably intentionally missing? Roughly estimated: House: 170 x €1,800 = €306,000 (however, we would be at €2,000/sqm turnkey) Garage: €30,000 Additional construction costs: €40,000 Outdoor facilities: €20,000 This totals about €100,000 more than your amount.

Let's be honest: the flooring work is just what we had to pay as an extra charge. We also have much more for the outdoor area, even though it's only done with gravel. Is the material included everywhere at all, or are only the labor costs indicated? [emoji15]

Let's be honest: the floor covering work is just what we had to pay as an additional cost. We also have much more for the outdoor area, even though it was only done as gravel. Is the material included everywhere or are only the wages indicated? [emoji15]

The wages are included :/ hm.. The assessments so far match my feeling (that it's too "cheap")..