Interior finishing costs - total cost planning

Hello dear ones,

first of all: many thanks to everyone who reads this (long) post and even replies!!! We are always looking for "our house" - a plot of land is available.

We now have an offer and it would be great if you could take a look to see if we are roughly correct with our "overall cost planning" or if we have forgotten something important! Many, many thanks!
It would also be great if you could tell us if you consider the amount from the construction company reasonable and if our "estimated amounts" are realistic. We have tried to calculate the individual items to get an approximate view of the total sum... my goodness, this is quite difficult... maybe someone has built a similarly sized house and has experience?

The offer is for a "closed shell" for a 140 m² house without a basement including
roof covering,
foundation slab,
windows with shutters, sliding door to the terrace, some floor-to-ceiling windows, front door, window sills,
colored exterior plaster,
gas heating, underfloor heating, fireplace, solar system,
floating screed,
stairs to the first floor (solid),
foundation slab for the garage.
For around 127,000 euros.

We want to do the interior finishing ourselves (thanks to many craftsmen in the close family circle as well as a talented man ), we are not under any time pressure.

Interior finishing means for us (here it would be great if you could
a) tell us if we have forgotten anything
b) take a look at the estimated costs, as we want to base our (overall) financing on this.

Surveys: 3000 euros
Building permit: 800 euros
Insurances: 1000 euros (including construction helpers realistic?)
Construction electricity: 1000 euros

independent building surveyor: ???????????????

House connection costs: 6000 euros (inquired, excavation will be done by the developer)

This is "only" about the materials:
Electrical installations: 5000 euros
Plastering walls: 5000 euros
Ceiling coverings: 2500 euros

Sanitary fixtures: 5000 euros
Tiles/wallpaper/floor covering: 5000 euros
Interior doors: 2000 euros

Stairs to the attic: 5000 euros
Attic finishing: 2500 euros

Machine purchase/rental: 20000 euros

Outdoor facilities/garden: 5000 euros

Garage: 10000 euros (without foundation slab, probably a "solid concrete garage", self-built is probably much more expensive?!)

And then you of course need a "buffer"... here I have found different statements between 5 - 20% of the total sum...
20% would of course be enormously much... do you have any advice?

Best regards and thanks for your effort!!!

Hello,

does closed shell mean without or with exterior plaster?
What is the goal: a low-energy house (standard 1996) or a KFW 55 or 70 efficiency standard?

What about the insulation in the attic - is it included or does it have to be done separately?

The costs seem well estimated, except for the exterior area: what is the ground condition around the property - fully leveled or a mess?

I would set a buffer at 10%.

Hello Cmajere,

thank you very much for your response!

The offer is an Effizienzhaus 70. The exterior plaster (colored) is included in the "closed" shell construction.

Whether the insulation for the roof is included is a good question... I will ask the developer.

The outdoor facilities are actually still a mess (although it really is "weed" and we will soon start to "clean it up" ourselves). There are no large trees or similar that need to be removed. The 5000 euros are budgeted "after completion" of the shell construction, i.e. the work and disposal costs "before" are not included.

Buffer 10% of "everything," i.e. after material costs etc.? That would be around 20000 euros... sounds like a lot... but is probably realistic... The bank will certainly not co-finance a buffer, meaning we would have to "reduce" our equity; right?

Where we are very uncertain is the interior plaster, here we have, as mentioned, budgeted 5000 euros + 2500 euros for the ceiling covering (although I am just wondering what exactly my husband meant by that, I have to ask again).

Hello,

I am also not sure about the interior plaster, but I prefer to have it done and then have a guarantee on it, these are fundamental things. What do you do if the plaster suddenly falls off the wall?

I think it's good that colleagues help at the construction site, I hope my colleagues will help me too, although I prefer to have things like wallpapering or tiling done by others. Applying plaster so that it is horizontal and no depressions or bulges occur seems difficult to me.

In the worst case, this can lead to serious disputes if, as in the example, the plaster doesn’t hold after all—who then bears the costs?

So the bank included our buffer. We have a 7,000 buffer in it and another approximately 5,000 in cash as a reserve.

Whereas our house will be ready for wallpapering at handover.

Regarding the gas boiler, think about it, there were again news about gas price problems as well as the note that we mainly get gas from Eastern countries; I wouldn’t want to be so dependent on that.

See if a heat pump might be possible for you too, since you are planning underfloor heating anyway.
Depending on the building size, you can get up to 4,500 euros cash back from the government for the heat pump if it meets certain annual performance factors.

Best regards

We have already "practiced" a bit of plastering (in a garage) and once you get the hang of it, it goes quite well. So when he comes down again, we have to handle it ourselves, since we won't do it with father-in-law... if it really doesn't work out, we'll just have to "bite the bullet" and hire someone. But as I said, since we aren't under any time pressure and can really save a lot here, we'll try it ourselves first...

Take a look if a heat pump might also be possible for you, since you're planning underfloor heating anyway.
Depending on the building size, you can get up to 4500 euros cash back from the state for the heat pump, provided it meets certain annual performance factors.

We thought about the heating system for a long time and informed ourselves. Among other things, we went to the consumer advice center for energy consulting. Originally, we wanted a heat pump (with deep drilling). After long calculations, etc., we came to the conclusion that it does not pay off for us. A heat pump (with highly estimated gas prices) only "pays off" after about 20 years (I had calculated it very precisely once, including interest we would pay for a higher loan, etc., I don't have the exact number at hand right now). And since heat pumps also have a limited service life (which is not even exactly known, the average is supposedly 15 years), in the worst case it doesn't pay off at all.
Alternative heaters like pellet, air, etc. are somewhat "cheaper" but simply don't appeal to us (for various reasons).
The energy consultant advised us to take gas and underfloor heating & fireplace — that way we're well "equipped" for later (maybe something completely different will come up soon).

The heating topic is super difficult. We thought long and hard and have decided for now.

Greetings!! I want to give my two cents *gg* I have a few questions about materials Electrical installations.) does that include the main connection (power pole supply line etc.) as well or only inside the house..? Plastering walls.) I’d say it really depends on whether you use machine plaster+(execution) or plaster by hand Ceiling covering what materials are used here and approximately the m² amount Staircase What material is it made of Attic conversion what materials are used and approximately the m² amount Sanitary objects. How many bathrooms and WCs will be created or execution. Interior doors What material which fittings. And last but not least about the garage I think and believe that you’d be much cheaper if you build your own garage Regards.