[I live in a STILL affordable area and even here €2,000 per sqm is the absolute minimum you have to calculate with. Realistically, it’s more like €2,200 per sqm. Then you have additional construction costs, ancillary purchase costs for the plot and outdoor facilities (terrace, paving, lawn, fence, trees, shrubs, external cables, shed, carport) plus furnishings including the kitchen.
House: 2,200 x 150 sqm = €275,000
Additional construction costs: €50,000
Furnishings: €15,000
Outdoor facilities: €15,000
Plot: €120,000
Purchase incidental costs: 8.5% x €120,000 = €10,000
TOTAL: €485,000
You MUST at least calculate with this total for a 140-160 sqm house without a basement and no fancy extras.
And based on your details I see this as not feasible for you. Because I believe the expenses will be higher on average per year than you have indicated. But the household budget book will show this when it has been kept continuously for 12 months.]
We are currently gathering offers. So far, in solid and prefabricated house construction, we have only found one provider each offering higher-end finishes at about €2,300-2,400 per sqm. But those are pure house costs without ancillary costs. So without much fuss and everything standard, €2,100-2,200 is definitely doable. But honestly, if I’m building a house for €280k, I don’t want doors that I can lift with one hand. Or tiles that look like they are 20 years old after 3 years. Cheap is unfortunately cheap. And a manufacturer who is high-quality as standard costs at least €2,300 per sqm again. There are no limits upwards!]