Calculate own contribution for house construction

Hello experts,

we want to build next year and are looking for construction financing. I have already bought the plot.

156,000 euros including incidental costs (equity 30,000 euros) - financed 126,000 euros but initially a variable loan

House - city villa with 189 sqm - two full floors plus basement

I still have 20,000 euros equity

The house costs without

painting work
tiles
tiling work
floor coverings
sanitary prefabricated assembly bathroom and guest WC
interior doors in basement/ground floor and upper floor
front door
French balcony railings
balcony railings

would cost the house 280,000 euros. My question now is, how do I calculate own work for painting services, attaching WC and bathroom fixtures, tiling work, laying floor coverings, installing interior doors, plastering the basement, making balcony railings.

Should I request quotes from different craftsmen and submit an offer to the bank for the calculation of own work or how do I do that?

Which banks actually include own work in the financing calculation?

Does it make sense to include the three KfW subsidies: Living with child, KfW 70 subsidy, and home ownership subsidy

totaling 150,000 euros?

Many thanks in advance!

Regards

Jayden

Pay attention to the short terms and sometimes interest-only periods with KFW. This can backfire with €150,000.

Hi,


how do I calculate my own contribution so that I can declare it as equity?

Regards

There is this page (which I can send you via private message) where this is described.

I am posting with the note that this was copied.

The personal contribution in house construction with a developer You need to consider in advance which personal contributions you can carry out during the house construction, both in terms of craftsmanship and time. The personal contributions in your house construction require the necessary knowledge, skills, and above all a lot of time.

For implementing the personal contributions, you should definitely get help from a construction expert.

In personal contributions, the builder usually manages at most half the work of professionals. However, the personal contributions help the builder save costs.

The personal contributions must be listed precisely before signing the contract and with the support of a construction expert to determine which personal contributions the builder will provide in the house construction.

If personal contributions by the builder are planned during the house construction, someone is needed for technical construction supervision.

Who is liable for the builder’s personal contributions if damages occur and the developer subsequently cannot continue building?
Time factor The time factor for the builder’s personal contributions must be integrated into the construction schedule to avoid construction delays at the house.

The time factor in personal contributions is significant and strains the nerves of the whole family.

The time factor in personal contributions determines your move-in date.
The earlier you can move into your house, the more rent costs you save.

The personal contributions should be completed before the final inspection.
Finances Personal contributions already engage prospective builders at the first financing discussion because they will be asked about them.

It should be noted that the builder can save at most about €25,000 through personal contributions when building a single-family house with three floors, 139 sqm living space, and net construction costs of €270,000. Personal contributions should be defined in advance of the house construction and, if possible, calculated very precisely.

Only labor costs may be accounted for in personal contributions, as the materials still have to be purchased.

Moreover, developers purchase at significantly better conditions, which clearly reduces the savings.

To save about €25,000 with personal contributions, the builder must work about 800 hours on the construction site. This should not be underestimated.

The following is a possible time allocation:

Days	Hours	Hours per week	Total hours
Mon-Fri (6 weeks)	5 days × 4 hrs	20 hrs	120 hrs
Sat (6 weeks)	1 day × 12 hrs	12 hrs	72 hrs
Sun (6 weeks)	1 day × 12 hrs	12 hrs	72 hrs
Vacation 30 days	30 days × 12 hrs	84 hrs	360 hrs
Sat/Sun during vacation (7 weekends)	14 days × 12 hrs	24 hrs	168 hrs
Total	12 weeks	-	782 hrs

This corresponds to about 3 months of working time during the entire construction period of the house.
Builder helper insurance [B]Be sure to take out private builder helper insurance.[/B]
[B]Professional association (BG – The costs are compulsory contributions) The builder’s personal contributions are hardly manageable without the help of relatives and friends. And this is where the professional association comes into play![/B]

[B]For personal contributions by acquaintances and relatives, the builder must take out builder helper insurance with the professional association and pay about €2 per hour; otherwise, there is no protection under the statutory accident insurance.[/B]

[B]The builder’s personal contribution is burdened here and quickly amounts to €1,000 or more for insuring the helpers in an average construction project.[/B]
[B]Example calculation €1,000 / €2 = 500 hrs / 10 helpers = 50 hrs per helper)[/B]
[B]Due to the compulsory contribution to the professional association, you incur costs.[/B]
[B]Personal contributions save you costs.[/B]
[B]You must now deduct the costs of the statutory builder helper insurance (compulsory contribution) from the total amount saved by your personal contributions.[/B]
[B]You should also calculate these costs very precisely in advance. This can and will affect your decision for or against personal contributions in your house construction.[/B]
[B][B]The following personal contributions can be carried out in your house construction:[/B][/B]
[B][B]See the individual checklists here Exterior basement insulation Light well installation Electrical empty conduits for communication cables Plasterboard filling Painting work Wooden ceiling Floor coverings Tiling Door frames[/B][/B]

I do not guarantee that this is still all correct (just quickly used Google)

Regards
Markus

Hello,

I am trying to bring the topic back up...

We want to build next year. We plan to have a shell house placed on our already existing plot.

Can someone tell me where I can find help on the Internet for calculating the additional costs?

Thank you very much!

Hello,

We want to build next year. We plan to have a shell house placed on our already existing plot. Can someone tell me where I can find help online for calculating the further costs?

That will not work, since each construction project must be considered on its own; it cannot be compared with other projects. Moreover, internet prices lag behind because they only reflect the pure material cost; the desired equipment must of course also be installed. If you want to purchase a shell house, who will handle the tendering of the necessary trades? Rhenish regards