Parametric dormer addition with unclear geometry and regulations

I’d like to share a recent case where Grasshopper really helped streamline a small but tricky project.
The task was to design a dormer for an existing house. At the start, nothing was fully defined:

-Dimensions were not precise.
-Orthogonality of the existing roof was compromised.
-Regulations were from another country, not fully clear.

To handle all this uncertainty, I set up a parametric workflow in Rhino + Grasshopper:

-Geometry controlled via a guide curve and sliders.
-Angles, joints, and timber connections resolved parametrically.
-Fabrication files exported directly from the definition.

This allowed quick iterations as regulations and client decisions evolved, without redrawing from scratch. It also helped avoid errors and reduced time/cost on the fabrication side.

Here are some images of the process and results:

Curious to hear:
How would you approach this kind of “uncertain geometry + unclear regulation” scenario?
Any ideas to make the workflow even more efficient?

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