Purchase of an existing single-family house prefabricated house year built 2000

Hello, after a long search we found a suitable house for us and wanted to ask for your opinion on whether my plan can work out like this?
A child is planned in the future, so one has to expect that an income will be reduced over a certain period of time. In general, I think it can be said that the financing is possible without problems until the first child. Until then, my plan would be to set aside a buffer again, in which money could become tight! It is planned that my wife can stay at home for about 2 years, and then if possible work 70-80 percent! (Depending on how it works out financially)
The plan was made for 35 years so that I have enough monthly buffer in case of a pregnancy. The goal would be to get down to 25-30 years through special repayments, but due to inheritance it would be over at the latest after 30 years (rather earlier)! Regarding the plan after the fixed interest period, I considered taking out a building savings contract, the interest rates there are still at 1.5 percent, but I still have to discuss that in detail!
What do you think, is it feasible?

Regards

General information about you:

[*]Who are you? Married couple
[*]How old are you? 27, 32
[*]Are there children? no
[*]Are children planned? yes, one
[*]Are you employed? Both permanent
[*]How many hours do you work? 40h

Income and asset situation:

[*]What income do you have (gross/net)? She 2100.- net, he 3000,-€ plus 13th salary and bonus (2000,-€)
[*]Income with child? 3300,-€ plus 650,- parental allowance for 2 years and child benefit 219,-
[*]How much equity do you have? 260,000€
[*]How much equity do you want to invest in the house project? 240,000€

Housing costs:

[*]current gross rent 75sqm 950,-€
[*]electricity 80.-€
[*]phone, internet, mobile 110.-€
[*]garage 80€

Mobility costs:

[*]car loan (or savings rate for new car) 250,-€
[*]insurance 75,-€
[*]taxes 20,-€
[*]fuel 200,-€
[*]motorcycle insurance 27,- €

Insurance costs:

[*]liability insurance 7€
[*]accident insurance is paid by employer
[*]household insurance 5,-€
[*]legal protection insurance 25€
[*]pet health insurance 18€

Living expenses:

[*]groceries 400€ (set a bit higher due to inflation)
[*]personal care/drugstore 40€
[*]pets 150€
[*]clothing 100€
[*]Netflix, TV license etc. 40€
[*]expenses during work 100,-€

Savings contributions:

[*]vacation is paid through bonus
[*]house 1400€

Other expenses:

Income and expenditure totals:

[*]total income: 5100,-€
[*]total expenses: 4077€
[*]balance 1033€
[*]of which cold rent and dispensable savings 2330€

General information about the property:

[*]How big is the plot? 600sqm
[*]What is the standard land value? approx. 300€
[*]New building, old building (year built), house type? old building year 2000
[*]Garages? double garage
[*]How big is the house? (living space / usable area) 115sqm
[*]What market value do the plot and house have after completion? 620,000€

Construction or purchase costs:

[*]Acquisition incidental costs (notary, court, land transfer tax, broker) 55,000€
[*]Renovation and/or repair costs: none planned for now

Other costs:

[*]kitchen is available
[*]furniture, lamps, decorations will be taken over

Cost summary:

[*]total costs 675,000€
[*]deductible equity 240,000€
[*]financing amount 435,000€

Necessary credit details:
(if several components, specify for all components, if several variants, please clearly distinguish):

[*]loan amount 435,000
[*]type of loan annuity loan
[*]interest rate (p.a. nominal, otherwise effective) 3.4%
[*]fixed interest period 20 years
[*]remaining debt at end of fixed interest period 250,000€
[*]assumed total term until full repayment 35 years
[*]initial repayment rate 1.49%
[*]monthly installment 1800,-

[*]Loan amount 435,000 [*]Loan type annuity loan [*]Interest rate (p.a. nominal, otherwise effective) 3.4% [*]Fixed interest period 20 years [*]Remaining debt at the end of the fixed interest period €250,000 [*]Imaginary total term until full repayment 35 years [*]Initial repayment rate 1.49% [*]Monthly installment 1800,-

Is this a real offer from a bank / an intermediary? In other words – does someone actually give you the 1.5% repayment rate, or would you just like it that way? I would have expected more like 2% as the minimum repayment. Otherwise, I consider the installment and the loan amount rather too high for your income. Unless both of you work in the public sector, then one could currently take a higher risk.

Positive is the amount of equity and the potential inheritance. During parental leave, however, it becomes very tight. If the parental leave lasts longer than two years (for example due to a lack of daycare places), it becomes even tighter. Is the property really worth the money? €620,000 purchase price minus €180,000 standard land value makes €440,000 for 115m², so just under €3,800/m² for a 20-year-old house.

Not unimportant, does the house have a [WP] or a gas boiler? Also, do repairs possibly need to be carried out? Because a 50,000 € additional financing, for example, could already break your neck.

Is this a real offer from a bank / an intermediary? In other words - does someone actually give you the 1.5% repayment, or is that just what you would like? I would have expected 2% as a minimum repayment.
Otherwise, I consider the rate and the loan amount too high for your income. Unless both of you work in the public sector, then you could currently take a higher risk.

Well, anyway, my bank advisor sent it to me like that! (house bank) I think we will have to say goodbye to 2% repayments in the future! But maybe he only offers the repayment because of the high equity, as the bank obviously has little risk there!

Positive is the amount of equity and the potential inheritance.
However, it will be very tight during parental leave. If parental leave lasts longer than two years (lack of daycare places for example), even tighter.

Is the property really worth the money?
620,000€ purchase price less 180,000€ land value equals 440,000 for 115m², so just under 3,800€/m² for a 20-year-old house.

Within a radius of 20 km (rural area) there is not a single habitable house under 600,000,- with an upward trend, at least so far!

Not unimportant, does the house have a heat pump or gas boiler? Also, do repairs possibly need to be made? Because a 50,000 € additional financing, for example, could already break your neck.

The bathroom was completely renovated 2 years ago for 35,000,-, a central oil heating system is installed + wood stove, as far as I know there is no gas connection! Whether a heat pump is possible, I cannot say at the moment; according to the energy certificate the final energy consumption is 70 kWh. At the latest in 8 years the heating system will have to be replaced, in whatever form!

What also needs to be said is that my alternatives here in the area are not really big! If I rent here in the area, I am paying between 1500-1800 cold rent, sometimes even 2000 cold is demanded for a semi-detached house! It’s not much better for apartments, where 100 sqm costs 1300-1400 cold plus additional parking spaces for the car at 1450,-

Since there are surely experts here. What kind of costs should I roughly expect for the new heating system in a few years? I have now estimated around 15-20k?