With a plastic dormer window, you can transform a dark room into a bright space. By installing a dormer, you bring in more light and increase the value of your home. Want to know more about plastic dormers? Read all about the advantages, prices and choices to make in this article.
What does a plastic dormer cost?
Plastic dormer prices average £7,500 including installation. This type of dormer, unlike a polyester dormer, has a wooden basic construction, with plastic as the finish. The table below gives an indication of the cost of a plastic dormer.
| Average cost incl. installation | |
|---|---|
| 2.5 metres | £6,500 |
| 3 metres | £7.000 |
| 4 metres | £ 7,700 |
| 5 metres | £ 8,500 |
| 6 metres | £ 9,400 |
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Price examples
With the help of the examples below, we explain the dormer prices once more.
Basic dormer
Do you want a maintenance-free dormer for one room in the attic? For an average of £7,700 you can have a plastic dormer window 4 metres wide installed. This will allow you to enjoy plenty of light and extra space in no time.
Luxurious finishing
In addition to the standard plastic dormer, you can of course add many extras for a beautiful dormer finish. Here you do not only have to think about the colour of your dormer, or the type of window frames.
Do you like to sleep in a completely darkened room, for example? Then buy good shutters right away too. This option can be installed together with your plastic dormer. The total cost for a 5-metre dormer will then come down to an average of £8,500 to £10,000.
What are the advantages of plastic?
Dormer windows can be made of different materials. Plastic is one of the most popular types of material. Why do many homeowners choose a dormer made of plastic? This material has several advantages.
- Resistant
- Available in many colours
- Low maintenance
- Easy to clean
- Long lifespan
- Average 10-year warranty
Price structure of a plastic dormer
The cost of installing a dormer is structured as follows:
What choices determine the price of your plastic dormer?
The price of your plastic dormer and its installation will be influenced by your requirements. Examples of choices you make include:
- Prefab (off-the-shelf) or a traditional dormer
- Dormer with a pitched or flat roof
- Wood-look or no wood-look
- Eventual extra options
1. Prefab (ready-made) or traditional plastic dormer
If you choose a prefab dormer, the installation will take no longer than one day. Because all the individual parts have already been assembled in the factory, a specialist only needs to assemble the dormer. Besides the convenience, choosing a prefabricated dormer also ensures a cheaper total price compared to a traditional variant.
Do you have special wishes regarding your new dormer? Or do you live in an older house where everything is no longer perfectly straight? With a traditional dormer, almost all wishes and situations can be taken into account. This is because the construction of your dormer is done on site. The price tag is obviously higher as a result.
2. Flat or pitched roof on the dormer
Most dormers have a flat roof. These dormers are finished with EPDM (a thin but iron-strong layer of waterproof rubber) and do not require any additional adjustments to the roof. For this reason, a flat roof is included in the price of a dormer.
It is also possible to opt for a sloping roof. This allows the tiled roof to be extended and water is drained from the dormer through these tiles. This ensures less maintenance and a longer lifespan. The initial investment is a lot higher though.
3. Wood look or not?
Don’t fancy the maintenance that wood entails, but do you want the characteristic look? With plastic dormers you can choose a special wood-look finish that cannot be distinguished from real wood. This allows you to retain the atmosphere, but without the maintenance.
For this look, Keralit is often used. Keralit is a durable and environmentally friendly plastic product that looks a lot like wood. When requesting and comparing dormer quotations, always enquire about the options for giving your plastic dormer a wood look and how much the additional cost will be for your dormer.
4. Extra options
In addition to the most important choices, there are also extra options you can consider. The specialist can advise you on this and in many cases install the extras directly after installing the dormer.
| 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 |
|
| Roller shutter/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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