ᐅ Structural Shell Contractor / Structural Shell Cost Estimation – How Do They Calculate?

Basically, the drainage should work fine.
The downpipe doesn’t have to go straight vertically; it can initially run with a slight slope within the ceiling. However, a bend in between is not ideal, but I don’t see any in your design.
Is the sewer connection at the end of the pipe?

Regarding your expectation to save costs through your ‘pre-planning’ with the architect:
The opposite is true.
Instead of starting from scratch on a greenfield site using the room program and zoning regulations, the architect also has to somehow accommodate your already quite detailed ideas.

Honestly, I would let them start from zero. Then take a look at their designs. If you then conclude that yours is better, you can still use yours.

If you are already fixed on your plans and are certain they comply with the zoning regulations, you are better off with a building designer authorized to submit plans, who can handle the detailed construction planning for you.

I really had to look closely to see where the newer plan differs. When it comes to toilet drainage, forced ventilation always plays a role; this goes up through the roof, or rather through the rooms above. And the single green shaft isn’t sufficient for all the kitchens and bathrooms.

But that was just one issue I noticed. The structural calculations are also not considered. Some walls are not aligned properly, for example.

And the basement garage being rotated 180 degrees on the plan doesn’t help with the assessment.

Regarding saving on the architect: unless they are a specialist you know personally, they will likely charge you more rather than less. At least, I wouldn’t see any reason why they would be more accommodating.

Hello,

This is exactly how I have done it so far. I found a certified structural engineer who prepared the plans in a clear format for a low cost. The building permit / planning permission process is currently underway. It is a 34cm (13 inch) wall construction (no development plan).

Unfortunately, the attic floor must be set back. This makes drainage a bit more complicated.
The offset is 1m (3.3 ft). To accommodate this, you have to extend the drainage horizontally through the ceiling... the windows below will also need to be designed differently.

I need a vent pipe for every continuous drainage stack, right?

Regards, AvH

Structural engineering: evaluated by a local structural engineer → the offset in the load-bearing walls is not an issue
Architect: I have someone who is proficient with SketchUp (my software). He takes my model and converts it into CAD
Ground floor layout: you are right. It will be adjusted.

Hello,

attached is the new design. The floor plans have been rotated. I have adjusted the windows concerning the drainage of the bathroom in the attic. We plan to build using Neopor formwork blocks. The drainage pipes will be embedded in the concrete. Rainwater will remain outside.

I am currently working on the parapet for the roof terrace. The insulation and waterproofing membranes should be continuous... which raises the question of how to anchor the parapet...

Maybe someone here has a tip...

Regards, Alex

The internal drainage system does not work at all. Here are a few examples:

• Is the wastewater from the bathroom in the attic supposed to run down into the room below? Wastewater pipes are never channeled through exterior walls. They are always located within drywall constructions or service ducts/boxed-in areas. I don’t see anything like that in the bedroom below.
• The same applies to the kitchen in the attic. Although there is a bathroom underneath, the upper side of the kitchen wall looks like only a half-height drywall partition.
• In the second bathroom (the right one), either two soil stacks are required now (one for the toilet and sink; another for the shower/tub). There is no room around the corner allocated for a drywall installation; at the same time, there is no boxed-in duct for venting upwards, which would be necessary in this workspace niche.
• The kitchen stack on the right side of the upper floor emerges in the roof terrace?

At the moment, I see five soil stacks running down to the garage level. Four of these should have air admittance or vent pipes. None of this is shown in the plans.

This really affects your layout because these boxed-in ducts can significantly limit furniture placement; at the same time, they don’t look good in the intended locations. Also, the windows in the attic workspace corner would not be feasible as planned.

We haven’t even started on electricity and heating yet…
(for example, the small apartment will need a distribution board with the necessary circuit breakers for the units. I don’t see space allocated for that anywhere.)