You want to take on part of the renovation yourself and thereby spend less money. For private planning a second question is important as well: what happens financially if your time or the planned help is not available? The following recommendations organise this scenario. They are neither a how-to for trades nor a statement about which personal work a bank recognises.
Describe the DIY work as a concrete task
Do not just enter a lump-sum amount “Eigenleistung” in the overview. Specify which task is meant, who is intended to carry it out according to the current plan and which prerequisites still need to be clarified. Work that requires professional expertise is distinguished from suitable persons; this article does not describe any activity as a safe DIY task.
Also set out the expected cash outflows: materials, actually required tools and agreed external services. A task carried out by yourself is no guarantee that no further payments will arise. Which items occur in your specific project must be clarified on the basis of the planning.
Make time shortage visible as a variant
Draw up a second version in which the planned personal work only succeeds partially. Perhaps a helper is not available or you can use fewer days off. Ask during the professional planning what effects the postponement may have on other tasks. Do not adopt made-up construction-sequence or cost assumptions as confirmation.
Finanznavi describes household planning as a combination of documentation, planning and control. [BUDGET] Our suggestion is to apply this control view also to the assumption “We will do this ourselves”. The idea checks a dependency and does not replace a professional calculation.
Example: a leisure task becomes an external contract
A couple plan to carry out a coordinated simple preparatory task themselves. A work appointment prevents the planned days off. For the second plan variant they ask about a suitable external execution and the price actually offered for it. They do not simply apply an arbitrary percentage to the total costs.
If the external solution exceeds the available budget, the scope of the project or the timetable is discussed professionally again. A later occupation date must not appear more secure merely because the first table was prepared that way.
Include private capacity in the calculation
Also think about what other expenses the period of personal work may entail: for example actually necessary additional journeys or a temporary different living arrangement. Enter only items derived concretely. General online amounts are not a personal cost confirmation.
If the same free time is already intended for a move, childcare or another job, it cannot be scheduled several times over. Record such overlaps in the overview and discuss a realistic allocation.
The check is not meant to argue against personal work in principle. It makes transparent which part of the saving depends on time, skill, help and the sequence. Only when a less favourable variant is also sensibly assessed does the planning serve as a basis for discussions about money and implementation.