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Home » Dormer window » Dormer windows specialist

Dormer windows specialist

When you have a dormer installed, you naturally want it to be done by a dormer specialist who delivers quality. In this article you will read more about dormer specialist prices, choices that influence the costs of your project, and useful tips.

What does a dormer specialist cost?

You do not only call in a dormer specialist when you have a dormer window installed, but also when you have a dormer renovation or install a skylight, for example. Below is an overview of average dormer specialist prices.

Project Average costs
(including labour and VAT)
Dormer renovation £ 650 – £ 7.000
Dormer window installation £ 6,500 – £ 12,000

Wondering about the prices of a skylight installation? Then read our price guide: skylight costs.

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Dormer specialist

Price examples

In order to get a better idea of dormer specialist prices, you will find three price examples below.

Small dormer renovation

Is your dormer in need of a small refurbishment, but a complete renovation is not necessary? In the case of a wooden dormer, a new coat of paint can already work wonders. If you only have the roofing of your dormer replaced, this will cost an average of £50 to £100 per m2. For small-scale renovations, check beforehand whether a complete renovation would not be more economical.

Placing a plastic prefabricated dormer window

Do you not yet have a dormer window, but want to buy one? Then, out of all the types and materials, you may choose a plastic prefabricated dormer. This project will cost you an average of £7,700 for a 4-metre dormer, after which you will endlessly enjoy the extra space and light coming in.

Replace your current dormer

Do you already have a beautiful dormer, but is it at the end of its lifespan? Then choose to have your dormer replaced for a new one. This is an investment, but after this you will enjoy all the benefits of a dormer window again. A dormer specialist charges an average of £7,000 to £12,000 for this project, depending on the material and dimensions. This price includes the removal and disposal of the old dormer.

Dormer dormer specialist prices

Cost overview Dormer dormer specialist prices

What choices will affect the cost of your project?

The total cost of your project depends on a number of choices you make. See below several choices that will affect the final price.

Choice 1: Type of dormer

When you have a dormer installed or replaced, the material and type of dormer will greatly affect the price of your project. A prefabricated dormer that is lifted onto the roof by crane is generally cheaper than a traditional dormer that has to be assembled on the roof in parts by the dormer specialist. See the prices for each type of dormer and material here.

Prefab Traditional
Wood dormer from £8,500 from £9,000
Plastic dormer from £6.500 from £ 7,000
Polyester dormer from £ 7,000

Choice 2: Degree of renovation

Do you already have a dormer, but is your dormer in need of renovation? You do not have to opt for a complete renovation if it is not necessary. A partial renovation is also possible. The table below shows some examples of smaller renovations a dormer specialist can carry out.

Project Average cost
(including labour and VAT)
Replaced fascias £ 900
Replaced lead flashings £ 650

Choice 3: A local or national company

Nearly all construction companies charge call-out fees, including dormer specialists. When you hire a company that operates nationwide and has to come from far away, you have to pay higher call-out fees. A local company logically has to travel fewer kilometres. They are therefore not only faster on site, but also save you money.

Choice 4: Additional options

Give your dormer something extra with these options. Blinds can make a big difference to the heat, especially for south-facing dormers. HR++ glass makes your dormer extra insulating. Shutters can also be a nice addition, especially with a dormer in the bedroom.

Extra option Average extra price
(including labour and VAT)
HR++ glass £ 135 per m2
Roll shutters £ 200 – £ 1.050
Ablinds £ 145 – £ 1,850

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