ᐅ Is it practical to build a prefabricated house using a solid construction floor plan?

Created on: 23 Sep 2024 22:50
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Skya2020
Hello everyone,

We have just purchased a plot of land in NRW. The previous owners had already hired an architect to fully oversee the construction using traditional masonry methods and have already paid over €50,000 (about $54,000) for phases 1-6. There is already a building permit / planning permission, so construction could start almost immediately.
However, we are planning to build using prefabricated construction and are now wondering how to proceed best. The previous owners have offered to sell us their plans. Either way, we would still need to modify them (aside from the exterior dimensions) to fit our requirements.
The plot is on a slope, and there aren’t many options for building on it, so the design would likely be very similar either way.
Does it make sense to buy the plans from the previous owners and then work with the architect to incorporate changes before approaching prefab house manufacturers? Or are the floor plans not very useful due to the different construction method, making it more reasonable to hire a different architect for a new design?
And if you were to buy the plans—how much would you pay (they don’t really have a strong bargaining position)?

We are completely at the beginning of our home-building journey, so I apologize if this is a naïve question... We just don’t really know the best way to start.
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hanghaus2023
29 Sep 2024 10:31
Minimum clearance distances should be maintained around an electrical box like this. However, this should be done on the neighbor’s property.

The driveway to the garage at the boundary requires retaining walls if it is to be brought down to basement level. To avoid this, the architect moved the garage into the house, which resulted in a basement that is too small for a proper rental apartment.

In my opinion, placing the garage at the boundary is better. You gain square meters in the basement and have a larger garden. However, this comes with higher costs for the garage at the boundary.
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hanghaus2023
29 Sep 2024 10:47
I had already redesigned the basement to include a secondary apartment.


2D floor plan of a house with garage, entrance area, stairs, and utility room




Floor plan of a house: garage with two cars, hallway, bathroom, bedroom, kitchen, living room, utility room, and storage


This even works with the house shortened by 1 m (3 feet).
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Skya2020
2 Oct 2024 08:49
hanghaus2023 schrieb:

The driveway to the boundary garage requires retaining walls if you want to bring it up to basement level. To avoid this, the architect moved the garage into the house, resulting in a basement that is too small for a comfortable granny flat.

In my opinion, having the garage at the boundary is better. You gain square meters in the basement and have more garden space. But there will be additional costs for the garage at the boundary.

However, the house will also be more expensive due to the increased square footage. We’ll see. In your example above, I would also miss a direct connection between the garage and the main house.
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hanghaus2023
2 Oct 2024 10:09
You decided on a new design. I had already sketched the basement earlier. Direct access from the garage is possible, but whether it is necessary or desirable is questionable.

Floor plan of a house with double garage, entrance, hallway, bathroom, utility room, bedroom, living room, kitchen, and technical room.


How large should the granny flat be?
11ant2 Oct 2024 14:58
Skya2020 schrieb:

In your example above, I would still expect a passageway from the garage into the main house.
Does it rain as much where you are as in London – how wet do you get covering four meters (13 feet) between the garage door and the front door?
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