Hello everyone,
we are just starting to consider adding a rooftop terrace. Here are the details:
- Single-family house, rooftop terrace already exists and was built over the carport, living room, and a storage room for garden tools (solid construction)
- Roof is flat and sealed with bitumen membranes
- There is no building permit/planning permission for the rooftop terrace, so this would need to be obtained beforehand
We have spoken with an architect who offered the following:
1) Review, integration, site visit
2) Evaluation and updates
3) Draft design preparation
4) Permit/planning approval including any variances
Total cost: 4300€
Photos of the terrace and drawings are attached. The terrace photo is not ideal, so I will upload more later.
We would like to have the terrace resealed and the slope adjusted (currently there are puddles forming) — meaning all necessary surface work, then terrace slabs installed. A railing will be required as well as a small sun terrace at the doors leading to the terrace. A lighting concept is also needed.
Now my questions:
1) Would you get multiple quotes from architects?
2) How do you evaluate this offer?
3) Should separate quotes be obtained for different work stages, or should everything be done in one go?
4) What costs can be expected for a project like this?
I am still quite "lost" with this topic and not sure what the right approach is 🙂. Additionally, there are some questions we need to clarify ourselves (usage concept, lighting concept, etc.).



we are just starting to consider adding a rooftop terrace. Here are the details:
- Single-family house, rooftop terrace already exists and was built over the carport, living room, and a storage room for garden tools (solid construction)
- Roof is flat and sealed with bitumen membranes
- There is no building permit/planning permission for the rooftop terrace, so this would need to be obtained beforehand
We have spoken with an architect who offered the following:
1) Review, integration, site visit
2) Evaluation and updates
3) Draft design preparation
4) Permit/planning approval including any variances
Total cost: 4300€
Photos of the terrace and drawings are attached. The terrace photo is not ideal, so I will upload more later.
We would like to have the terrace resealed and the slope adjusted (currently there are puddles forming) — meaning all necessary surface work, then terrace slabs installed. A railing will be required as well as a small sun terrace at the doors leading to the terrace. A lighting concept is also needed.
Now my questions:
1) Would you get multiple quotes from architects?
2) How do you evaluate this offer?
3) Should separate quotes be obtained for different work stages, or should everything be done in one go?
4) What costs can be expected for a project like this?
I am still quite "lost" with this topic and not sure what the right approach is 🙂. Additionally, there are some questions we need to clarify ourselves (usage concept, lighting concept, etc.).
I am missing a drawing of the plot itself, including the neighboring plots.
Could it be that the building with the flat roof is a garage located on the property line?
If so, a terrace on top would trigger setback requirements and make implementation (almost) impossible.
Please provide the relevant drawings, then you can certainly expect better information. 😉
Could it be that the building with the flat roof is a garage located on the property line?
If so, a terrace on top would trigger setback requirements and make implementation (almost) impossible.
Please provide the relevant drawings, then you can certainly expect better information. 😉
Hi everyone,
sorry! Yes, that's correct.
To the right, there is a plant nursery, so that wouldn’t be an issue. To the left, we have neighbors, so we need to clarify things with them. Otherwise, the boundary would need to be moved further inward to maintain the required distance. Signatures definitely need to be obtained, but as I said, in my opinion, this is not impossible.

sorry! Yes, that's correct.
To the right, there is a plant nursery, so that wouldn’t be an issue. To the left, we have neighbors, so we need to clarify things with them. Otherwise, the boundary would need to be moved further inward to maintain the required distance. Signatures definitely need to be obtained, but as I said, in my opinion, this is not impossible.
S
SaniererNRW12319 Oct 2022 13:51Nuyshen schrieb:
I am still quite "lost" on this topic and don't exactly know what is the right choice Basically, I usually advise against having a roof terrace on a single-family house. What would you use it for if you already have a garden? During the day until evening, people normally stay in the living room and don’t go upstairs just to use the roof terrace.
Nuyshen schrieb:
... To the right there is a plant nursery, which would not be a problem. To the left, we have neighbors; we need to clarify this with them, otherwise a boundary line would have to be moved inward to maintain the required distance. Signatures would definitely have to be obtained, but as I said (in my opinion), this is not impossible. Phew, the drawing is quite "challenging."
And why do you think it’s not a problem?
Setback distances do not only apply to "private" neighbors!
As far as I know, they require entries in the land registry; a plant nursery won’t just agree to that without further formalities!
So before hiring an architect, I would first post complete and proper information here.
And then the matter will probably already be resolved if I have interpreted the drawing correctly.
Trying to extract information from someone is unproductive and not enjoyable 😳
@SaniererNRW123
Yes, I know exactly what you mean, so we still need a realistic usage concept. The roof terrace is adjacent to the two children's bedrooms, which could be a possible use scenario in the future. Of course, it also gets full-day sun. However, the roof terrace currently just doesn’t look good at all. Additionally, puddles form, and the bitumen membranes sizzle in the sun with a slightly chemical smell.
@i_b_n_a_n
1) We have a very good relationship with the nursery, so I assume this won’t be a problem.
2) Before I hire an architect, I want to first gather complete and proper information here – where can I get that info? An appointment at the building authority / planning department?
3) As I said, I’m still very much at the beginning. It’s not that I’m lazy, but I just need help with how to start this topic, then I can proceed (I just don’t want to head in the wrong direction…).
4) If experienced builders could give me one or two tips for the first steps, that would be very helpful.
Attached is what I consider to be a better drawing of the site plan.
Thanks and best regards

Yes, I know exactly what you mean, so we still need a realistic usage concept. The roof terrace is adjacent to the two children's bedrooms, which could be a possible use scenario in the future. Of course, it also gets full-day sun. However, the roof terrace currently just doesn’t look good at all. Additionally, puddles form, and the bitumen membranes sizzle in the sun with a slightly chemical smell.
@i_b_n_a_n
1) We have a very good relationship with the nursery, so I assume this won’t be a problem.
2) Before I hire an architect, I want to first gather complete and proper information here – where can I get that info? An appointment at the building authority / planning department?
3) As I said, I’m still very much at the beginning. It’s not that I’m lazy, but I just need help with how to start this topic, then I can proceed (I just don’t want to head in the wrong direction…).
4) If experienced builders could give me one or two tips for the first steps, that would be very helpful.
Attached is what I consider to be a better drawing of the site plan.
Thanks and best regards
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