Are you looking for dormer costs to create a wonderfully spacious bedroom or a bright workplace in the attic? Read in this article about dormer prices, materials and other choices involved in buying a dormer.
What does a dormer cost?
Dormer costs start at around £6,500, including installation. For this amount, you have a plastic dormer 2.5 metres wide. Of course, prices vary depending on the size, installation method and material. The table below gives you an indication of dormer costs with different sizes and materials.
| Plastic | Polyester | Wood | |
|---|---|---|---|
| 2.5 metres | £6,500 | £7,000 | £8.500 |
| 3 metres | £ 7,000 | £ 7,500 | £ 9,300 |
| 4 metres | £ 7,700 | £ 8.200 | £ 9,900 |
| 5 metres | £ 8,500 | £ 9,000 | £ 10,800 |
| 6 metres | £ 9.400 | £ 9,900 | £ 11,800 |
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Price examples
Would you like to know which dormer is best for your budget? We will discuss some situations.
Budget-friendly
You will be cheapest if you choose to have a small hull plastic dormer installed, and thus take care of the interior finishing yourself. For such a 2.5-wide dormer window, you will spend around £6,500 including installation.
Good value for money
A larger sized prefabricated dormer window will cost you comparatively less per m2 . Polyester dormers are cast from a single piece of plastic and are therefore completely leak-proof with a high insulation value. Do you prefer to leave the entire project, including the finishing of the inside, to an experienced dormer window specialist? The dormer cost of a 4-metre polyester dormer including installation is around £8,200.
Great and luxurious
Are you planning to buy a large-format dormer to span several rooms? And would you like to go for the authentic look that wood brings? The dormer specialist will carry out the entire project for you: from installation to a luxurious finish on the inside. The price of a 6-metre wooden dormer is around £12,000.
Do you need a permit for a dormer?
It is possible to install your dormer without a permit. For this, your dormer must meet a number of conditions. These are:
- Dormer window does not face a publicly accessible area (e.g. a road, green area or waterway)
- Maximum height of 1.75 metres
- Placement at least 0.5 metres from the top, side and bottom of the roof
- Dormer window finished with a flat roof
Does your future dormer window not meet these requirements or are you in doubt? Then do the permit check at the Omgevingsloket. Whether or not you will receive a permit depends on, among other things, the zoning plan and the building regulations of your region.
How do the costs of a dormer window look like?
The dormer window prices are structured as follows:
If you are going to buy a dormer window, most of the cost consists of the dormer window itself. You can influence the amount of this price by the choices you make.
What choices will affect your dormer costs?
If you have a dormer installed, the price will be determined by the choices you make. We will cover some of those choices below:
Choice 1: Prefab or traditional dormer
The first choice that affects the price of a dormer is the method of installation.
- Prefab dormer: This is the type of dormer most people choose. The word says it all: a prefab dormer has already been assembled in the factory, and is placed on your roof in its entirety. The big advantage of this is that it is already on your roof within 1 day.
- Traditional dormer window: The traditional dormer window is built step by step on the roof. This may be preferred if the exemption for a crane is very expensive or there is no place for the crane. This is also a fine option for older houses that are no longer completely dead straight. This renovation does take longer than a prefab dormer due to the local assembly process.
Choice 2: The material of your dormer
A second choice that affects the dormer price is the type of material the dormer is made of.
- Plastic dormer: A dormer made of plastic is by far the most popular in the Netherlands. This is because it is affordable (from £6,500) and the dormer requires almost no maintenance.
- Polyester dormer: A polyester dormer consists entirely of plastic. In terms of insulation and durability, polyester is the best material of the three types. In addition, the dormer is maintenance-free and there is no risk of damage. The additional price you pay for this dormer compared to a plastic one is around £500 to £1000.
- Wood dormer: Finally, there is the wooden dormer that allows you to give your house an authentic look. A wooden dormer requires annual maintenance, but is easy to repair in case of damage. Wooden dormer costs start at around £8,500.
Choice 3: Flat or pitched roof on the dormer
A third choice that affects dormer prices is the roof as the finishing touch.
- Flat roof: The flat-roofed dormer is popular. Most dormer prices therefore include a flat roof. It is the cheapest choice, requires little modification to the roof structure and, provided you also meet the other conditions, is permit-free. The most commonly chosen form of roof covering is EPDM (lifespan 40 years).
- Sloped roof: A dormer with a sloped roof is virtually maintenance-free, as rainwater and dirt drain off the roof naturally. Roof tiles form the roofing material in most cases and therefore the pitched roof has a long lifespan (80 years). The existing roof tiles can be reused on the dormer. You do pay more for a pitched roof. This is because of the extra materials and because this project requires more labour.
On the roofing prices page you will find more information about the different types of roofing.
Choice 4: Extra options
Additions such as sun blinds, extra ventilation grids or a flyscreen are not necessary, but they are worth considering to increase your living comfort. Let the dormer specialist include them immediately during installation. You can always have a dormer quote prepared with the extras, and later choose whether or not to do certain things.
| Option | Costs | Advantages | |
|---|---|---|---|
| Ventilation grille | £8 – £12 per decimetre | – good for a healthy living environment – prevents moisture problems |
|
| Tilt and turn window | £ 125 – £ 200 each | – easy to clean – two settings: ventilate and quick-through |
|
| Insect screen | £ 75 – £ 100 each | – keeps pesky insects out – easy to install in your skylight |
|
| Roll blind/screen | £ 500 – £ 1.000 each | – sleep in complete darkness – keep out heat in summer, £40 per element |
– create extra – storage space |
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Frequently asked questions
Dormer costs differ depending on the material and dimensions, among other things. A 4-metre plastic dormer costs on average £7,700. For polyester you pay an average of £8,200, where for wood you should take into account an average of £9,900.
