Cost estimation for renovating a 70s bungalow, any experiences?

If I don’t consider external facilities, notary, etc., I come to 370k for about 165sqm of living space, so about 2242€/sqm with photovoltaics, kitchen, etc. However, also with a good share of own work (walls, ceilings, old radiators, water pipes, cables removed, installing floors and doors myself, cutting grooves and installing boxes for the electrician...) and the living space is calculated including the hallway. I don’t know how you calculate that. The kitchen is included, new furniture not yet but we have quite similar costs there.

We are at 2150€/sqm including kitchen and terrace for our major renovation. Minus subsidies hopefully around ~1950€/sqm.

We did everything except the facade insulation, because it was already there, and basement drying, because we do not need the basement as living space.

With 195sqm living area:

Roof: approx. 170sqm roof area, gable roof completely new except for the roof frame, and we also have an approx. 11sqm canopy, which was newly sealed --> 60k
Electricity: 24k
Windows: 34k (wood, approx. 50sqm window area, total 16 elements, including 2 elements 2.5x2.3m with a normal door, one 6m sliding door element, 4 three-part elements 2x1.8m, plus real wood front door, interior and exterior window sills new)
Shell construction: 35k (including new drainage connection, porta-potty for 1 year, lots of steel, terrace foundations, ...)
Architect: 37k
Kitchen: 21k (appliances purchased ourselves)
Terrace: 11k
Tiles: 8k (including bathroom underfloor heating, tiles partially self-purchased)
Structural engineering: 3k
Radiators: 18k (wanted to keep the old floorboards)
Basic installation (drinking) water: 22k
Heat pump: 31k (10kW)
Bathroom equipment: 10k (fittings, 2 showers, 1 bathtub, partition walls, glass, cabinets, towel radiator, etc.)
Rebuilding chimney for fireplace + installation of our old fireplace: 4k
Photovoltaics: 18k (12kWp without storage)
Painting work: 60k (repairing clay plaster, new top plaster throughout the house, painting, covering steel beams, drywall cladding of pipes, sanding and repairing floors, lowering ceilings, exterior painting ...)
Laying new floor: 4k
Insulating basement ceiling: 5k
Partially new interior doors: 3.5k (7 pieces)

In addition, lots of small things, energy consultant, heating load calculation + hydraulic balancing, 5 containers of demolition waste (the most expensive was 800€), mailbox / doorbell, network technology (switch + access points), new sofa, ceiling spots (self-purchased, 20 pcs).

Basically, we had budgeted many items like that. What really blew us away was the painting work. Here we had to pay a lot of money (>15k) for hourly work (drywall and plaster repairs, preparations on the facade, insulating steel beams, etc.) that we did not expect before. And additionally, all the small stuff, which easily sums up to another 10k. One should always have that in mind...

Oh, by the way: funding somewhere between 40 and 50k, depending on where they might possibly cut. Partly Bafa (roof, heating), partly local city subsidies (photovoltaic, roof), partly tax declaration (windows)

And the costs are relatively final, we are moving in a month and already have some final invoices (roof, photovoltaic, heating and water, windows, painter, ...).

It would be nice if only the renovation costs were mentioned in the price per square meter. In particular, the following items do not belong there and ruin comparability:
- Kitchen
- Photovoltaic system
- Furniture
- Terraces/outdoor facilities
: Without these costs, which initially have nothing to do with a house renovation, your approx. €250/sqm for the pure renovation is cheaper. So after the subsidy at €1,700/sqm. I find that a really good price, considering that everything was done.

We are currently working on the construction financing.

For the major renovation, the architect has called for 300,000 euros, plus 30,000 euros for [Photovoltaik].

Of the 300,000 euros, 200,000 euros are planned for energy-efficient renovation.

The house has 136 sqm.

With 300,000 euros, I come to 2205 euros per sqm.

We are not done with the [Sanierungsfahrplan] yet, it is still coming. That is why I am currently trying to get a sense of the costs. We have time, want to obtain enough offers and compare them. We will do the demolition work ourselves, with the rest it will only become clear over time what we want/can do ourselves ([Schlitzen], [Bodenbeläge], …).