ᐅ "Extension" of a townhouse – just before construction begins...

Created on: 9 Jan 2021 17:29
J
JonasK.
Hello dear forum,

My wife and I are planning to build an urban villa of just under 170sqm (1,828 sq ft) together with our two children. We have found a nice plot with hardly any restrictions in the development plan, a great architect, a floor plan that works well for us, the building permit (in the building notification procedure) is in place, and we want to start in the next few days. So far, everything sounds great...

...if only my wife and I hadn’t received an unexpected Christmas gift and now need an additional child's bedroom :p 😎 although unplanned, of course we are really happy, but we now have to rethink. Our architect is still on vacation and will be back on Tuesday, but this whole thing is weighing on my mind, maybe someone still has an idea...

[B]Option 1 – Bigger house, completely new floor plan
[/B]
This is only an absolute last resort for us; we actually don’t want to build bigger since our eldest is “already” 14, so it won’t be three kids forever...

Option 2 – Basement
Not an option due to costs and the required redesign.

Option 3 – Adjust existing floor plan
We have already tried this, but we don’t want to make the children’s rooms smaller either. Although we have planned an office, it is also needed as such.

Option 4 – Our favorite
We have a hipped roof with a pitch of 25 degrees, initially designed as a cold roof (is that the correct term?), with a folding ladder. We planned to insulate it ourselves later (although I have now read that “simply insulating” is not a good option regarding mold, but that is another topic...) and use it as storage space.
Our current idea would be
  • to partition off 8sqm (86 sq ft) of the walk-in closet from the bedroom as a separate room and install a staircase from there to the attic
  • to turn the current office into a bedroom, and use the attic as an office/guest room
For this, the roof pitch would increase from 25 degrees to 35 degrees; two roof windows on one side are already planned, and possibly later adding a dormer or similar. The attic would be insulated accordingly, and the upper floor ceiling checked for structural capacity and sound transmission. The attic would be connected to the ventilation system, and in the lower room, the underfloor heating would be installed with very close spacing (5cm (2 inches) apart) to partially heat the upper room as well (since warm air rises). Partition walls with drywall would be installed in the attic to create storage spaces behind them.

Is this feasible—or a totally crazy idea?! 🙄

At first, I would just need to notify the building authority about the changed roof pitch (is that complicated? A completely new building notification? We will still remain within the development plan with this modification) — the static calculations would have to be redone... but I estimate this option to have the lowest cost and time effort.
What about escape routes...? Is there anything to consider?

Of course, I will discuss this with our architect, but I wanted to get some feedback before I get stuck on this idea...

Thanks for your suggestions!
K1300S10 Jan 2021 13:54
Converting the attic into living space is definitely possible, although it won’t come free, of course. However, I would point out that a hip roof with a 35-degree pitch looks completely different from one with a 25-degree pitch. To me, the former lacks elegance.
A
apokolok
10 Jan 2021 17:27
You should be able to fit three children's rooms into 170m² (1830 sq ft).
It's nice to see that you are happy.
Just the thought of starting over again with such a huge gap sends chills down my spine.