ᐅ Extension to an Existing House (New Construction 2021)

Hello everyone,

we built with Town & Country in 2021 and have recently grown in size, so we realize that an additional room would be beneficial. Has anyone been through something like this and can help me understand how much it might cost?

We would like to add 30-45 sqm (320-484 sq ft), extending the living room and a hallway.

Chris1990 schrieb:

We want to add 30-45 m² (320-480 sq ft), including a living room and a hallway.

You can generally expect a six-figure amount (+/-), depending on the size of the extension and the complexity.

Chris1990 schrieb:

We built with Town & Country in 2021 and have now expanded, but we realize that an additional room would be beneficial. Has anyone gone through something like this and can help me understand what the costs might be?
We would like to add 30-45 sqm (320-480 sq ft), with a living room and a hallway.

30 to 45 sqm (320 to 480 sq ft) will cost roughly 90,000 to 135,000 EUR. It would be helpful to know the structural situation (floor plans, site plan, building envelope, zoning plan). Adding onto a gable side is quite different from adding onto an eaves side, and both options are usually less expensive than adding an extra story or raising the roof—but only rarely do the permitted building measures allow all these options. Another alternative—assuming the technical and legal requirements are met—would be to place a mobile home or tiny house (one manufacturer calls it a "flying space") next to the main building. I didn’t find a completed questionnaire in your post history—how else should we be able to answer your question?

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In 2021/2022, we added 45 sqm (484 sq ft) to the ground floor on the gable side. It is a single-story extension with 42.5 cm (16.7 inches) brick walls and a concrete ceiling. The shell construction, flat roof waterproofing, and windows probably cost around 60,000 euros. Minor work was done by ourselves (ceiling insulation).

I don’t have isolated numbers for the interior finishing because we also extensively renovated the existing 120 sqm (1292 sq ft) ground floor, and a lot of work was done by ourselves.

Teimo1988 schrieb:

We added about 45 sqm (480 sq ft) to the ground floor on the gable side in 2021/2022. It probably cost around 60,000 euros.

So rough estimates of 100,000 euros and more seem realistic.

Chris1990 schrieb:

We built in 2021 with Town & Country

I think the basic requirements need to be clarified first. Usually, building boundaries on the plot set many limits; often, the permissible floor area ratio is already fully used when building the house. Or there may be subsidies that restrict the living area or similar. Take a look at your building plans— the drawings should reveal a lot.