You can take it from us, if you want to transform that tired and unused attic space a dormer window is exactly what you need! This vertical window extension has become a popular edition to many homes throughout the UK and it’s not a surprise.

If you are thinking of having a dormer put into your home, take the time to read through this first and let us guide you on everything from styles and types, the do’s and don’ts, the benefits, average cost and even if you need planning permission. This can be a lot of work for some people and it’s better for you if you know what to expect!

When it comes to styles and types of dormer it can be a difficult decision for some homeowners.

From small windows to large extensions, there is quite a lot of choice, but happily the only major difference comes with the construction.

There are two main types of dormer that can be fitted in your home. A vertical window set into, and projecting from a gable ( Λ ) roof, and larger, longer extension with vertical sides/cheeks extending to the floor.

With the first option they need to be sympathetically designed to form an attractive and stylish addition to the roof, internally and externally.

The larger, longer roof extensions with vertical sides/cheeks need structural elements such as a steel I-beam to support the dormer roof section. The difference, as previously mentioned, is really in the overall construction, but the choice here lies in what will best suit your home.

Design and style often depends on your actual home and it’s structure and other factors.

Where the dormer faces, i.e. to front, side or rear, the size of loft and room required and the existing roof shape, e.g. hip end roofs gain significant useable area. It is also worth keeping in mind that planning out a budget before you start is always a great idea as the bigger the area, the more it will cost.

The most fun part for a lot of people will be when they actually get to pick the style that they want. Flat roof (box shaped), Sloping roof, Pedimented and gable end (pitched) and Hip end (pitched & sloping to front). These are just several styles and we urge you to look into whichever one you think will suit you best.  

When compared with most Velux / ridgeline conversions, a dormer window can add a lot more benefits such as, significantly greater useable floor space, Feeling of space, Vertical window design options, Versatile room use and even opens up a better furniture options!

We have to advise to choose your dormer window accordingly.

Dormers need to be an integral part of the overall house design and generally subservient to, or at least picking up the design guidelines of, the existing roof shape.

There is now a tendency for some homeowners to go over the top and add an extension that is too big and not structurally sound. Really put time and effort into planning out and being realistic with what you can have in your home.  

A lot of people also start to ask the question of whether or not they will need planning permission if they want to have a dormer fitted in their home.

The quick answer is a qualified no. They generally come under Permitted Development rights (which can be found here). The new rules assume dormers are allowed if within specified limits and conditions.

The cost of adding a dormer doesn’t have to break your bank either! As a guide, the cost is approximately £4,000 (4 metre wide) to £8,000 (8 metres wide) plus vat, but again this is all dependent on the existing structure. You can always contact local carpenters for a quote (cough, cough).

A dormer is something that, if at all possible to add to your home, is a must. It will add value to your property, free up space, transform what would be unused space, it isn’t a huge amount of money to construct, there is no planning permission needed and best of all it will look great on your property (as long as you follow our guide lines and pick your dormer appropriately.)

If you need advice or help then please feel free to give us a call or contact us