ᐅ Additional Costs for Dormer / Gable or Frisian Gable

Hello, I have a question about the design of the house facade. We would like to integrate a cross gable (external dimensions: 3.70×1.50 meters (12.1×4.9 feet), projecting about 180 cm (6 feet) knee wall) into our new single-family house. Alternatively, a Dutch gable starting from the eaves is also an option. At the back, we are considering adding a trapezoidal dormer about 3 meters (9.8 feet) wide. During our last meeting, the planner advised us to think carefully about this because a complex roof structure can be costly. However, we believe that since most people only build once, it should also please us. My question is whether anyone has experience with the additional costs involved. Also, what is more affordable: a Dutch gable or the cross gable?
Best regards

Hello,

Your planner is correct! Both a cross gable and a Frisian gable usually do not differ much in cost; the roof pitch with the latter is simply steeper. A trapezoidal dormer of that width can almost compete in price.

What I do not understand is your explanation of the cross gable. Typically, homeowners choose this form of additional space because the gable provides a standard ceiling height directly. How should I interpret your limitation of a 1.80 m (5 ft 11 in) knee wall?

Regards, Bauexperte

Yes, that was an estimated value from me, but you’re right, I didn’t consider that there isn’t much difference whether there are two more rows or less. I mean, the biggest cost factor in the whole project is not the masonry but the roof structure. If we leave the masonry aside and only consider the additional costs for the roof, could you give me a rough estimate of how much more it would cost compared to a standard gable roof with a 45-degree pitch and 2 roof windows?

Hello,

derstefanm schrieb:

.... could you give me a rough estimate of how much more it would cost compared to a standard 45-degree gable roof with 2 roof windows?

Aside from not knowing which federal state you plan to build in, a dormer with a gable or a Frisian dormer finished with plaster would likely add around 8.5 thousand euros (approx. $9,100) in additional costs; depending on how the sides are clad and what type of windows are installed, it could be more or less. A trapezoidal dormer would be about 6.5 thousand euros (approx. $7,000).

These figures correspond to values for North Rhine-Westphalia (NRW).

Regards, Bauexperte

Yes, I’m from North Rhine-Westphalia, almost Lower Saxony, so at the northern tip.
Do the rough costs you mentioned include the masonry? It’s not entirely clear to me.
Thanks anyway for your effort!

Sorry, I overlooked it.

derstefanm schrieb:

Apart from not knowing which federal state you plan to build in, a dormer or Frisian gable with plaster finish is likely to add around EUR 8,500 (about USD 9,000) in extra costs; depending on how the sides are clad and which windows are installed, this could be more or less. A trapezoidal dormer costs roughly EUR 6,500 (about USD 6,900). Figures correspond to prices in North Rhine-Westphalia (NRW)!

There it is.