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Joey van der Hart
Call now 06 - 29 08 07 57
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Joey van der Hart
Call now 06 - 29 08 07 57
Custom dormer window for more space and light in the attic
Do you want to get more out of your attic or upper floor? With a dormer window, you create extra headroom, natural light, and usable space under a pitched roof. This way, a space that is now mainly used as a storage attic can be transformed into a bedroom, workspace, or other full-fledged room.
Van Der Hart Timmerwerk builds custom dormers that fit the house and the space underneath. We handle the construction and carpentry work, help think through the layout and finishing, and ensure you have a single dedicated contact person throughout the project.
- Fully custom dormer window
- Craftsmanship in construction and carpentry
- A single point of contact during the project
- An eye for space, light and neat finishing
Turn your attic into a space you actually use
Beneath a sloped roof, there is often more floor space than you can practically make good use of. Along the slanted sides, standing headroom is lacking, and natural light can also be limited. A dormer window transforms precisely that part of the upper floor.
By extending a section of the pitched roof outward, sufficient standing height is created across a greater width to make the space practical to furnish. At the same time, windows provide more natural light. As a result, a dark attic can suddenly become suitable as a bedroom, office, playroom, or bathroom.
Which dormer yields the most depends on the dimensions of the roof, the roof pitch, and what you want to do with the space. Therefore, we not only look at the exterior of the house, but precisely also at what the dormer needs to deliver on the inside.
What can you create with a dormer window?
Every attic and roof construction is different. That is why we do not only look at the dimensions of the dormer, but primarily at how much extra headroom, daylight, and usable space you want to create.
A larger bedroom
A dormer window creates extra headroom along the sloped roof and more space for a bed, wardrobe, or desk. As a result, an attic that is currently awkwardly laid out can be transformed into a comfortable bedroom.
A bright home office
An attic workspace is pleasant if there is sufficient light, height, and room to move around. With a dormer window, you create a spot where a desk can fit well and where natural daylight enters.
Space for a bathroom
Would you like to build a bathroom on the upper floor? A dormer window can create the extra height and freedom of movement needed for that. Whether this is possible for your home depends, among other things, on the layout and the technical connections.
One wide dormer window for multiple rooms
A dormer window does not always have to stop at a single room. If the construction and dimensions of the roof permit, a wider dormer window can, for example, provide extra space and light to two adjacent rooms.
Wooden dormer with a look that matches your home
A wooden dormer offers a lot of freedom in sizing, detailing, and finishing. This makes wood attractive when the dormer truly needs to match the style of the home or when standard sizes do not fit. We look at the window frame layout, fascia boards, side cheeks, and other details as a single entity.
A custom dormer window for your roof and space
No roof and attic layout are exactly the same. That is why, for a custom dormer, we first look at the existing roof surface, the construction, and what you want to achieve with the extra space inside.
The width, height, and position of the dormer window directly influence the usable space. Furthermore, the window layout, ventilation, choice of materials, and connection to the existing roof determine how the dormer ultimately functions and looks.
In addition, our background in carpentry comes in very handy. We pay attention to the structural connection as well as visible details and finishing, so that the dormer window becomes a neat part of the home both outside and inside.
Dormer window or roof extension: how much space do you want to create?
A dormer window and a rooftop extension are both used to create more space at the top of the house, but they are different renovations.
A dormer window is installed in an existing pitched roof. Around the dormer, the existing roof remains recognizable, and you locally create extra headroom, daylight, and usable floor space.
With a roof extension, the intervention goes further. In this case, a larger part of the roof or the top of the house is modified to create significantly more living space or even a complete extra floor.
Isn't a dormer window enough for your space requirements? Then also check out the possibilities for a roof extension on your home. We can assess on-site which solution best fits your home and plans.
What customers say about us
A dormer window becomes part of both your roof and the space beneath it. Therefore, you want to be able to rely on good craftsmanship, neat connections, and clear agreements during execution. Read how other customers have experienced working with Van Der Hart Timmerwerk.
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MikeTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Super tevreden over Van der Hart Timmerwerk! Vanaf het eerste contact met Joey en Lindsey was alles gewoon duidelijk en goed geregeld. Zeker een aanrader!Geplaatst op Google![]()
Linda BijlTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Joey heeft deze zomer bij ons de opbouw verzorgt. De communicatie was strak, helder en mede dankzij zijn goede adviezen en meedenken in de beste oplossingen, is het resultaat fantastisch mooi geworden. Joey komt zijn afspraken netjes na, heeft echte vakmensen in dienst en doet er alles aan om tot het meest optimale resultaat te komen. En dat alles tegen een eerlijke prijs. Dat kom je niet zo vaak meer tegen, chapeau!Geplaatst op Google![]()
Alex BerendsenTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Ik ben zeer tevreden wat Joey vd Hart heeft opgeleverd (tuinhuis en leefruimte buiten) en hoe de samenwerking is verlopen. Heel flexibel en hele robuuste oplossing. Vakmanschap en hoge kwaliteit.Geplaatst op Google![]()
Tal AmirTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Top craftsmanship by top professional. Only compliments. Highly recommended.Geplaatst op Google![]()
W.A. BomgaarsTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Zeer goede ervaringen met dit bedrijf. Vakmanschap met initiatief. Kunnen dit bedrijf van harte aanbevelenGeplaatst op Google![]()
MAKSIM SERGEJEVICHTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
We zijn erg blij met ons project – 'Een berging met een naastgelegen Overkapping'. Ik kan alleen de positieve punten opnoemen. Joey is erg punctueel, netjes, transparant en zeker professioneel in zijn taak en tevens een harde werker. Joey reageert snel en is ook een meedenker (wat erg fijn is) en ons tot veel meer creativiteit en slimme (technische) oplossingen heeft gebracht. In het kort – topvakman ! Dit zal zeker voor ons niet het laatste project zijn. Zeker een aanrader!Geplaatst op Google![]()
Justin DekkerTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Fijne gozer, met goeie prijzen en netjes werk. Wij hebben ons veranda door Joey neer laten zetten en hij heeft ons hierin goed geadviseerd. Het resultaat is erg mooi!Geplaatst op Google![]()
M VhTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Joey is een fantastische timmerman die echt de tijd en moeite neemt om het project tot iets moois te realiseren. Is altijd bereikbaar voor raad en daad!Geplaatst op Google![]()
Tim van BeekTrustindex verifieert dat de oorspronkelijke bron van de recensie Google is.
Vakbekwame timmerman met een ontzettend goed oog voor detail!Google waardering: 5.0 van 5, gebaseerd op 24 recensies
From opening in the roof to neatly finished dormer window
Installing a dormer literally means creating an opening in the existing roof structure. This new structure must then be solidly, insulated, and watertight connected to the existing roof. Working carefully is especially important at those connections.
Van Der Hart Timmerwerk can handle the construction and carpentry work around the dormer window within a single project. This way, different components do not need to be organized separately from each other.
- Measuring and preparing the dormer window
- Opening and modifying the existing roof structure
- Making the required supporting structure
- Construction and installation of the dormer window
- Insulation of roof, dormer cheeks and connections
- Installing window frames and windows
- Waterproof connection to the existing roof
- Finishing fascia boards and exterior
- Carpentry and interior finishing
- Nice connection to the existing space
Do you want to tackle the complete attic or other rooms in the house at the same time? Then we can look into whether we can combine the work within a remodeling of your home.
Online
Joey van der Hart
Call now 06 - 29 08 07 57
Prefer to receive a call back?
How much does it cost to have a dormer window installed?
The cost of a dormer window depends on more than just the width. The existing roof, the construction, the choice of materials, the window layout, and the desired interior and exterior finishing also influence the total investment.
A smaller dormer window for a single room requires a different design than a wide wooden dormer window that provides multiple rooms with extra height and daylight. Custom work in window frames, detailing, and finishing can also make a difference.
That is why we first inspect your home and discuss what the dormer window needs to achieve on the inside. Based on that, we outline the necessary work and material choices so we can provide a suitable quote.
What determines the price of a dormer window?
The final investment is determined, among other things, by:
- The width and height of the dormer window
- The existing roof structure and roof pitch
- Required structural modifications
- The choice of materials for the dormer window
- The number and size of windows and frames
- The chosen window layout
- Insulation and roof finishing
- Finishing of fascia boards and side cheeks
- The desired level of interior finishing
Do you need a permit for a dormer window?
A dormer window can be installed without an environmental permit for the spatial part under certain conditions. The position on the roof, as well as the dimensions and shape of the dormer, are particularly important in this regard. For example, different options apply to a dormer at the rear than to a roof plane facing a public area.
Furthermore, building without a permit does not mean that no building regulations apply. Even a dormer window that can be installed without a permit must comply with the technical requirements that apply to structures.
Therefore, check in advance via the Permit check of the Environment and Planning Portal what applies to your address and dormer window. This way you will know before the work begins whether a permit, notification or other step is required.
See what we made for others
No project is the same, so we always deliver custom work. From complete renovations to refined patio roofs and custom woodwork projects: view a selection of our work and get inspired for your own plan.
Project in Uithoorn
- 30 September 2026
- Roof extension
Project in Amstelhoek
- August 30, 2026
- Garage extension
Project in Amsterdam
- August 17, 2026
- Roof extension
Project in Amstelveen
- April 7, 2026
- Garden shed
This is how the installation of your dormer window works
A good dormer starts with a careful look at both the roof and the space beneath it. We discuss what you want to achieve, examine the existing construction, and determine the dimensions and design that best fit. After that, we carefully prepare the work so that opening the roof and installing and finishing the dormer follow each other logically.
Step 1 – Application and introduction
You let us know what you have in mind, big or small. We will contact you to discuss your wishes, ideas, and expectations.
Step 2 – Site Visit
We will visit you to inspect the home and the available space. This gives us a clear picture of the current situation and allows us to provide targeted advice on the possibilities.
Step 3 – Proposal and non-binding quote
Based on your wishes and the situation, we will create a clear proposal. You will receive a non-binding quotation in which the discussed work is clearly described.
Step 4 – Design and preparation
Following approval, we will elaborate the plans further. We will coordinate the construction, materials, schedule, and necessary preparations with you, ensuring everything is clear before we start.
Step 5 – Construction and finishing
Our team realizes the expansion and ensures that the various activities are well-coordinated. During execution, we will keep you informed of the progress.
Step 6 – Delivery
Upon completion, we will review the work together. We will check the execution, discuss any points of attention, and ensure a neat delivery of the new space.
Why have your dormer window installed by Van Der Hart?
With a dormer window, structural work, roofing work, and precise carpentry all come together. The opening in the roof must be properly supported, while the exterior of the dormer must be able to withstand the elements and the interior must seamlessly connect to the existing space.
Van Der Hart Timmerwerk therefore looks beyond just installing the dormer window. We help you think about the space you want to gain, keep an eye on the home's appearance, and also handle the carpentry and finishing around the new structure.
We work from Uithoorn and carry out projects within a radius of approximately 40 kilometers. Throughout the entire process, you will have a single point of contact and we will make clear agreements regarding preparation, execution, and completion.
This is why customers choose Van Der Hart Timmerwerk:
- Craftsmanship in construction and carpentry
- Dormers fully tailored to the home
- Many possibilities for custom woodwork
- An eye for both construction and finishing
- Clear agreements and direct communication channels
- Single point of contact from application to delivery
Frequently asked questions about dormers
How wide can a dormer window be?
How wide a dormer window can be depends on the available width of the roof surface, the structure, and the regulations that apply to your situation. A wider dormer can provide more usable space, but also requires a larger modification to the existing roof structure. Therefore, we always determine the appropriate width based on the roof and your space requirements.
How much extra space does a dormer window provide?
That varies per home. Primarily the width of the dormer window, the pitch of the roof, and the existing height determine how much extra usable space is created. The greatest gain is often not just in extra floor space, but especially in the part of the attic where you can actually fully stand and move around after installation. The influence of width and roof pitch on the space gained is also clearly reflected in current search results on this subject.
Can a dormer window span across two rooms?
Yes, that is possible in certain situations. For example, a wide dormer window can run across two adjacent bedrooms and provide both spaces with extra headroom and daylight. Whether this is possible for your home depends on the roof structure, room layout, and available width. Dormer windows spanning two rooms are also offered and searched for as a separate application.
Can a dormer window be installed on any pitched roof?
Not automatically. The roof shape, pitch, available height, and construction determine whether a dormer window can be technically well integrated. Furthermore, a dormer belongs to an existing pitched roof surface; with a flat roof or when the roof shape changes much more drastically, you are more likely to end up with a roof extension.
How much maintenance does a wooden dormer window need?
A wooden dormer window requires periodic maintenance to properly protect the wood and paintwork against weather influences. How often maintenance is needed depends, among other things, on the location, the finish used, and exposure to sun and rain. Regular inspection and timely touch-ups prevent small damages from developing into bigger problems. Periodic inspection and paint maintenance are also specifically mentioned for wooden dormer windows.
More plans for your home?
Perhaps you also want to modify other parts of your home besides the dormer window. Van Der Hart Timmerwerk can coordinate various construction and carpentry work within a single project.
Roof extension
Do you need more space than a dormer can provide? With a roof extension, you can enlarge a much larger portion of the top floor.
More information
Home remodeling
Combine the work in the attic with a larger renovation of other rooms in your home.
More information
House renovation
Renovating existing spaces and parts of the home to make them suitable for the coming years.
More information
Carpentry
Custom work for structures, finishing trim, and other wooden components in and around your home.
More information