Extension to an existing "multi-family house" - boundary distance?

There is not even an invoice yet. If someone from the forum also feels called upon to address this question, he/she is welcome to get in touch, but I fear that only the preliminary building inquiry will bring me legally binding enlightenment. Regarding the question "windows in the upper floor new construction," I had hoped for more opinions to make progress with the floor plan drawing. But of course, the final say lies with my colleagues from the responsible building authority.

Beyond your clearance area - whether it would be used with a garage or not - you should be able to enjoy views, regardless of whether they are worthwhile.

and now the million-dollar question: How large/long/wide is this clearance area?

With a cultivation obligation of zero; and in the worst case half the eaves height of Grandpa's house and likewise yours, I would say. Qualified statements on such questions can be found here from , from a professional competence perspective I have seen only "opinions" on this.

as border development

That means you are aiming for a real division?

It is clear that an encumbrance would have to be registered

No. Here is a solution without an encumbrance:
[ATTACH alt="Lageplan.png" type="full"]46544[/ATTACH]
The house is quite small (9m*10m). Whether it is enough, you have given too little information regarding your wishes.

Grandpa hasn't had his for about 10 years

And is there a permit for the conversion?

Let's put this side issue aside for now.

You are explicitly asking about the building law aspects. Planning law makes up at least half of that.

however, I fear that only the building inquiry will bring me legally binding enlightenment there.

Yes. Actually, the development plan must be changed or partially repealed. The municipality will probably not want to do that. Your designer will have to come up with a creative solution with the authorities. Since neighboring rights will hardly be affected, a legally not entirely watertight solution might be considered.

"Windows in the upper floor new building"

... mean 5m free space in NRW. Lower Saxony’s §30 is very short and not very concrete. Since fire protection is not my area of expertise, I have to pass on that.

How large/long/wide is this clearance?

§§ 5-7 Lower Saxony Building Code. If you read through these three paragraphs, you will find that this question is not so easy to answer. What I consider probable is shown above (distance from the ridge 5.15m). But then there is also §66 Lower Saxony Building Code, which could certainly come into question because of the existing fire wall.

My advice: Build directly adjacent, possibly with an integrated garage in the house. Everything else is a waste of space, because the plot is not that big after all.

So you are aiming for a real division?

That’s the plan, the issue was already discussed here in a similar way in the thread by the pianist.

The house is quite small (9m*10m). Whether it’s enough, you gave too few details regarding your wishes.

I’m afraid the distances to the street on the left were not observed there, otherwise of course it’s worth considering. We’d have to take a look at the access then. But thanks already for the creative input.

Yes. Actually, the development plan must be changed or partially repealed. The municipality will probably not go for that. Your planner will have to come up with a creative solution with the authorities. Because neighbor law will hardly be affected, a legally not entirely watertight solution could be considered.

What legally not entirely watertight idea do you have in mind?

... mean 5m of open space in NRW. Lower Saxony’s §30 is very short and unspecific. Since fire protection is not my area of expertise, I have to pass.

I will try to use my contact at the fire department, maybe someone there has an idea...

§§ 5-7 Lower Saxony Building Code. If you read these three paragraphs, you will see that this question is not so easy to answer. What I consider likely is shown above (distance from the ridge 5.15m). But then there is also §66 Lower Saxony Building Code, which could be relevant due to the existing firewall.

That’s why I would actually like to talk to the building authority, face2face would of course be best to be able to sketch something right away or so. Currently of course difficult, hmm.

My advice: Build directly adjoining, possibly with a garage integrated into the house. Anything else is a waste of space, since the plot is not that big anyway.

Yes, that is probably the best solution. Maybe it doesn’t fit at all with my (not sufficiently presented here) wishes (Hello questionnaire, I will probably have to fill you out yet)

Thanks so far, I know I skipped some questions, I will inquire accordingly.