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Dormer Windows: How to Get Them Right

     Dormer windows can be tricky to get right in design terms, yet, done well, they are ideal for creating ‘rooms in the roof’ in a loft conversion or a house that doesn’t extend to two full storeys

Dormer windows can be a tricky detail to get right. The pitch, roof line and how dormer windows interact with existing the house, as well as those around it, all need to be carefully considered.

When dormer window design goes wrong, it can ruin the entire look of a property, negatively impacting the overall design. Talk to an architect or designer when planning in some additional head-height.

Planning permission is not usually required to add dormer windows, providing they do not exceed the highest part of the roof, among other specific parameters. However, it is always best practice to check with your local planning office that the work does fall within your permitted development rights before any works begin.

If the house is in a conversation area or the materials chosen for the dormer’s exterior contrast in style to the existing house you will need building consent for any significant works. To find out more info in regards to een dakkapel laten plaatsen have a look at our page.

From the French ‘dormir’ meaning ‘to sleep’, dormer windows are vertical units within a roof of their own, positioned, at least in part, within the slope of the roof. Ideal for those who can’t extend sideways or to the rear in urban areas or for self-builds with height restrictions, dormer windows can come in all shapes and sizes depending on what is right for the house.

A gable fronted dormer is the most common type of dormer window and traditionally has a simple pitched roof sloping to two sides. A vertical frame supports the planes to form a triangular section below the roofline.

A shed dormer has a sloped single flat plane roof in the same direction of the roofline but at a shallower angle. A hip roof dormer slopes on three planes and converges at one point.

With a curved roof and no sides, the eye brow, or eyelid dormer style gradually emerges as the roof moves up and over the dormer in a flattened bell curve.