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Gaube: costs, benefits and construction
Gaube: costs, benefits and construction

Video: Gaube: costs, benefits and construction

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Video: Cost benefit analysis 2023, February
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A dormer has many advantages. But the cost of dormers can explode quickly. We have summarized all details and information on added value and benefits as well as the various designs and types for you.

Table of contents Table of contents dormer in the roof: Information about costs, benefits and construction

  • Dormers: benefits and advantages
  • Disadvantages of dormers
  • What permits do you need for a dormer?
  • Plan dormer windows in good time
  • What types of dormers are there?
  • Tow dormer: a classic for all cases
  • Flat roof dormer: an inexpensive construction
  • Saddle roof dormer: The dormer for renovations
  • Triangular dormer: also an option as a ready-made dormer
  • Hip dormer: The trend dormer
  • Trapezoidal dormer: more space for windows
  • Bat dormer: The elegant dormer
  • Round dormer: a variable construction
  • Ready dormer or made to measure?
  • Costs for dormers and funding opportunities

Table of contents Table of contents dormer in the roof: Information about costs, benefits and construction

  • Dormers: benefits and advantages
  • Disadvantages of dormers
  • What permits do you need for a dormer?
  • Plan dormer windows in good time
  • What types of dormers are there?
  • Tow dormer: a classic for all cases
  • Flat roof dormer: an inexpensive construction
  • Saddle roof dormer: The dormer for renovations
  • Triangular dormer: also an option as a ready-made dormer
  • Hip dormer: The trend dormer
  • Trapezoidal dormer: more space for windows
  • Bat dormer: The elegant dormer
  • Round dormer: a variable construction
  • Ready dormer or made to measure?
  • Costs for dormers and funding opportunities

Such a dormer is something fine. You not only create more living quality for your attic, but also set a visual highlight. Therefore, dormer windows are becoming more and more popular with us despite the rather high costs. But dormers are not only an architectural asset as a roof structure. They also have a positive effect on well-being and conjure up more space, more light and better air in our houses. They expand the living space and at the same time create more space for windows that - another advantage - heat up less than the classic sloping windows. After all, faster and more intensive ventilation options ensure a good living climate. Ideally, dormers should be installed when building a new building. Retrofitting is not impossible, but it is often significantly more expensive. However, the costs can possibly be offset somewhat by a subsidy.

Dormers: benefits and advantages

Dachgaubenfenster
Dachgaubenfenster

A real eye-catcher: the free-standing bathtub is given a wonderful place under the long dormer window.

Photo: living4media / Van Berge, Alexander

  • Dormers create additional living space in the attic
  • Allow better ventilation of the attic
  • Offer space for natural light sources such as windows
  • Provide a great view
  • Are an architectural highlight and a visual statement
  • Lead to an increase in the value of the home

Disadvantages of dormers

There are a few things to consider when building dormers. And that discourages many builders, especially because the costs are not negligible. Because there are not only costs for the dormer window, but also costs for roof connection, insulation and sealing. If work is not carried out properly here, there is a risk of moisture damage and mold. Therefore, in most cases, you should leave the construction of dormers to a professional. Cutting costs through do-it-yourself work is difficult. Apart from that, the usual bureaucracy also applies to dormers: for example, a building permit must be obtained for the dormer window and a structural analysis must be arranged. New fire protection regulations may also apply to subsequent construction, which you must observe. However, much of this is put into perspective once the dormer is ready and used.

An absolute basic requirement for the subsequent construction of a dormer is an optimal roof condition. Here the structure and statics have to be checked. Because of the effort, building a dormer is particularly worthwhile for new buildings. But roof renovation is also a good time to build a dormer.

What permits do you need for a dormer?

In principle, the building regulations of the respective federal state apply to the construction of a dormer. Therefore, you should in any case first ask your responsible building authority whether you need a building permit or whether a notification procedure is suitable for you. In most cases you will probably need a building permit. If the dormer you are planning gives insights into the neighbor's garden or even into his house, then you will probably also have to obtain permission from the neighbor. In addition, the dormer should fit structurally into the neighborhood - otherwise approval is often denied.

Plan dormer windows in good time

If you have special requirements for your new dormer window, you should define these precisely before deciding on a dormer type. Because dormer windows are directly connected to the construction of the dormer. If you want floor-to-ceiling windows or even a door, waist-high fall protection is mandatory. And: Not every type of dormer allows every type of window. So decide in advance where your preferences are and why. Keep in mind that sacrificing a large window in favor of multiple small dormer windows can sometimes make more sense. The implementation is then easier and you achieve a more harmonious overall effect.

What types of dormers are there?

With dormer windows you can choose between four different dormer types:

  • Flat dormers
  • Pointy dormer
  • Angular dormers
  • Round dormers

Flat dormer windows (tow dormer, flat roof dormer) have a low dormer roof pitch. This creates a lot of new living space with a comfortable head height. Dormers with a pointed roof (saddle dormer, triangular dormer) are particularly suitable for retrofitting. However, there is a little less usable space here. Angular dormers (hipped roof dormer, trapezoidal dormer) appear more individual, since they are not quite as common as flat and pointed dormers. Round dormers (bat dormer, round dormer) also set a very special highlight. If all structural requirements are met, you should consider the following parameters when choosing a dormer: existing roof covering, planned dormer size, dormer window, dormer material.

Unterschiedliche Arten von Dachgauben
Unterschiedliche Arten von Dachgauben

Whether flat, pointed, square or round: You can basically choose between four types of dormer windows.

Photo: iStock / UJ Alexander

Tow dormer: a classic for all cases

The drag dormer is one of the oldest dormer types and is a widespread classic. It is a comparatively simple construction. The drag dormer is characterized by a rectangular window front and a flat roof pitch, through which rainwater can still drain well. That is why this type of dormer is mainly used for steeper roofs. Remember that the roof of a dormer must have a lower angle than the house roof. With pitched roofs with a steep angle, a direct connection under the ridge cover may be possible. Usually the same material is chosen for the roof covering of the dormer as for the house roof. It looks particularly harmonious.

Flat roof dormer: an inexpensive construction

The flat roof dormer lives up to its name because it has an almost horizontal roof. It has an average of only three to five degrees. This has advantages, but also certain disadvantages. The flat roof dormer ensures a comparatively large amount of space. In addition, construction and installation are particularly simple. However, it looks somewhat functional and is typically clad with metal. Bricks are not suitable for this type of dormer. Due to the simple design, the costs are comparatively low. The usual flat roof guidelines apply to flat roof dormers.

Saddle roof dormer: The dormer for renovations

In addition to the dormer, the saddle dormer is also extremely popular with us. This gable hood is one of the oldest types of dormer and has a triangular roof over a rectangular window front. The ridge runs straight to the actual ridge. This is equally simple, elegant and classic - especially since the dormer roof covering is usually adapted to the roof of the house. The saddle dormer has two disadvantages: It can only be installed with roof pitches from 30 degrees. And there is less usable space than with flat dormers. The simple design proves to be a real price advantage.

Triangular dormer: also an option as a ready-made dormer

This type of pointed dormer is particularly easy to recognize by its triangular roof, which also forms the window front. In Germany we see the triangular dormer less often than other dormer windows, which may be explained by the somewhat smaller window front and the lower incidence of light. The dormer looks very modern despite its simplicity. Tip: If you like it quick and easy, you can use a prefabricated dormer that is already clad and available with connection elements.

Dreiecksgaube
Dreiecksgaube

The modern triangular dormer is also available as a ready-made dormer.

Photo: iStock / UJ Alexander

Hip dormer: The trend dormer

The hipped dormer looks a bit like a cousin of the saddle dormer: the roof runs at the same angle on the sides, but in the hipped roof dormer it is additionally inclined or sloped forward. This dormer type gets its special look from an abbreviated or missing ridge and a triangular roof. The more complex construction requires a certain amount of additional effort. But the hip roof dormer is also very special and trendy. The triangular roof front, however, saves more space than other dormers.

Trapezoidal dormer: more space for windows

A special visual highlight is the trapezoid dormer. The dormer cheeks run diagonally to the roof surface and form a trapezoid. The big advantage of this dormer is the generous window front: there is even space for several windows. However, the trapezoidal dormer is not suitable for small roofs. Usually the same material is used for roofing as for the house roof. This creates a special, but still very harmonious look. Trapezoidal dormers have a similar gain in space as towed dormers, but are more complex to construct.

Bat dormer: The elegant dormer

The bat dormer is particularly recognizable by its "sinus curve". In some places it is also called "ox eye". The roof surface must be raised for the curved shape of the dormer. Here, curved woods are used. Below that is the window front in the form of a rounded opening. The bat dormer fits seamlessly into the roof, but is particularly complex to construct. There is also a limitation on the cover material: it must be small. For example, thatch, slate or beaver tail are suitable - not the cheapest materials for roofing, but chic and weatherproof. So the cost of a bat dormer is high - but so is the design factor.

Fledermausgaube
Fledermausgaube

The bat dormer is weatherproof and fascinates with its extraordinary look.

Photo: iStock / lior2

Round dormer: a variable construction

Round dormers are available in two versions:

  • Segmental dormers
  • Barrel dormers

Segmental dormers have a front with a circular cutout that rests on the sides of the dormer. They are very flexible in size. Barrel dormers have no separately visible dormer cheeks and are seamlessly connected to the semicircular roof. The curved dormer roof can also be used for particularly wide dormer windows. The roofing is usually done with metal, which makes rain noise sometimes very loud. Therefore, pay attention to good insulation. The connection of a round dormer is not particularly easy, but it can still be easily retrofitted

Ready dormer or made to measure?

Those who have very special requirements or wishes for their dormer will certainly tend towards an individually planned dormer despite the increased costs. These dormers are made on site. Homeowners are free to choose in terms of design, size and trim. But keep in mind that for an individually made dormer you not only have to plan more money, but also more time.

Prefabricated dormers, on the other hand, are ready-to-install components, i.e. ready to be placed on the roof. Here you also have a certain selection of sizes and designs. Complete offers for ready-made dormers usually also include clarifying the structural requirements and applying for permits. It's best to ask for a fixed price. Installation should take a day or two.

Costs for dormers and funding opportunities

You can get a cheap dormer in a standard size from just 1, 000 euros. On average, however, you should plan to spend around 4, 000 euros per dormer, which also applies to ready-made dormer windows. Of course there is always room for improvement in terms of costs, especially bat dormers can quickly become very expensive. Basically, the cost of a dormer depends on the following factors:

  • Dormer
  • Size of the dormer
  • Mounting material
  • insulation
  • Dormer window (number, size, characteristics)
  • Roof connection
  • transport
  • labour costs
  • Additional costs (window sills, special handles)

Good to know: If the installation of dormer windows is part of an energetic optimization or renovation, KfW (Kreditanstalt für Wiederaufbau) offers various funding options: grants of up to 5, 000 euros or discounted loans of up to 50, 000 euros.

Anja Schmidt

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