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The design of dormer windows to roofs either in bungalows or two storey drawings needs careful consideration. The conflict between gaining additional floor space internally and an acceptable architectural pleasing external appearance must be appreciated if a successful dormer addition is incorporated. Of course we can advise and help with the planning of the dormer’s that will give you practicality and be external pleasing.

The roofline of a dwelling is one of its most dominant features and it is important that any appendage to the roof does not distract from the appearance of the dwelling. This is particularly true for the front of any dwelling, being the prominent view and seen by passers by.

When considering a loft conversion, one of the first questions asked will be to install roof windows or dormer windows.


If possible a dormer should be installed to the rear of the dwelling, but this is not always possible. There may be an extension to the rear of the dwelling and the extensions roof prevents the construction of a dormer. But generally this is the preferred location. Flat roof dormers (not acceptable in front locations) can be constructed to the rear.

The traditional pitched roof dormer is generally not as wide as the flat roof dormer and often includes decorative features that add to the appearance of the building.


Traditional style dormers stem from the incorporation of vertical windows in extended height walls. These dormers are used where the external walls extend above the floor level. The eaves are usually between three and five feet above floor level.


This style is still used in modern dwellings to good effect.
The dormer windows to the front elevation should be finished in the same material as the main dwelling. The sides of the dormer should match the roof covering with slates or tiles hung vertically. Where this is not possible then the sides of the dormer may be covered in cladding materials.


The front of the dormer should not be covered in cladding. The use of low maintenance materials should be used to avoid the dormer becoming unsightly through neglect.

The size, proportion, shape, design, location and finishes of the dormer all contribute to the appearance of the dormer window, each of these need to be considered if a successful dormer design is to be achieved. Generally dormers over 2.5m wide are too wide, if possible two dormers side by side should be used instead. The converse can also be said to be true, dormers that too small can have odd appearance.
Rectangular dormers are not the type of dormers that can be fitted to a roof, Eyebrow dormers have been used for many years and give a pleasing appearance.


Eyebrow dormers, because of their shape, require large steeply sloping roofs that have small pan tiles covering. Arched dormer windows with a lead roof covering can be fitted to period dwellings. Modern dwelling can be fitted with triangular dormer windows, but care must be taken to balance these with other features of the dwelling.
With over 20 years experience we will be more than happy to advise you on your unique requirements.



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