Converting a garage to living space

When do you need a permit for converting a garage?

Whether you need an environmental permit depends on three questions:

Does the facade change? Replacing a garage door with a frame with window or a solid wall is almost always a facade change. If the new facade deviates from the original building plan or the aesthetic review requirements, an environmental permit is required for this. During aesthetic review the municipality also assesses the appearance. Tekenpunt gets 90% of applications through aesthetic review in one round.

Does the environment plan permit the change? In many environment plans an attached garage is designated as an outbuilding or part of the home with a storage/garage function. The transition to a full residential space (living) requires a permit for an environment plan activity in most cases. Always carry out the permit check on the Omgevingsloket (omgevingsloket.nl) to be certain for your address.

Is the property a listed building or in a protected townscape? If you live in a national monument, municipal monument or protected urban or village conservation area, almost every external modification requires a permit. The requirements are then more stringent and the assessment stricter.

In summary: in most cases where you replace a garage door and fit out the space as a living room, you need an environmental permit. Exceptions are possible if the facade does not change and the environment plan already allows the function, but that is relatively rare. Always verify this via the permit check.

Structural requirements from the Bbl: what must the space comply with?

The Decree on construction works in the living environment (Bbl) sets minimum requirements for every living space. A garage does not meet these as standard. When converting you must address the following points:

Ceiling height A habitable space must have a minimum clear height. Most attached garages achieve this comfortably, but if the floor is set lower or the roof structure is low, this can be a point of attention. Check the internally available height during the design phase.

Daylighting A living space requires a minimum amount of daylight via a window or roof light. A garage door provides no daylight in the sense of the Bbl. You must therefore add a window or window frame, which also explains the facade change that is so often part of this project.

Insulation (thermal and sound) The thermal insulation requirements (Rc values) for a habitable space are considerably higher than for an unheated garage. Roof, floor and walls must be insulated to the required level. For existing dwellings the requirements for existing construction apply, but if you apply for a permit the municipality also checks whether the insulation installed meets the standards.

Ventilation A living space must be ventilated mechanically or naturally. The Bbl requirements for air renewal in a bedroom or living room are specific: sufficient fresh air must be able to enter and polluted air must be able to leave. In a former garage this system is generally absent.

Fire safety If the converted garage adjoins other rooms or a floor, additional requirements may apply for fire-resistant partitions and escape routes. This is particularly relevant if there is a door to the dwelling that is currently not fire-resistant.

Floor A garage floor is sometimes lower than the ground floor of the home and generally has no crawl space or floor insulation. Raising or insulating the floor is almost always part of the project.

The drawings that Tekenpunt produces give the contractor and the municipality insight into how the space meets all of these requirements.

The facade change: replacing the garage door with a window frame

The most visible step when converting a garage is replacing the garage door. That door disappears and is replaced by a window frame with glass, a solid facade or a combination of both. This is a facade alteration that almost always requires an environmental permit.

Why does the municipality assess this? A facade alteration affects the streetscape. In neighbourhoods with an aesthetic review policy, a review committee assesses whether the new facade fits the architecture of the area and the existing home. Tekenpunt makes facade drawings that show what the new facade will look like, including materials, window layout and the relationship to the surrounding facades.

What does Tekenpunt draw for you? For a permit application where the facade changes, the following drawings are generally required:

• Site drawing (overview of the property on the plot)
• Floor plan existing and new (before and after the modification)
• Facade drawing existing and new (including the new window opening)
• Cross-section (height, roof build-up, any structural adjustment)

With that set of drawings the application is complete for most municipalities. Tekenpunt also handles the submission to the municipality as a package component.

Structure: is a steel structure required?

When converting a garage, a steel structure is by no means always necessary, but there are situations where it is.

When is a steel beam or other structural element required? If you modify the load-bearing structure of the garage, install a large glass section in the new facade, or remove the existing garage opening and replace it with a new configuration in which the frame width exceeds what the existing surround allows, a structural calculation is required. Sometimes the existing parapet wall (the wall section next to the garage door) is no longer present after the renovation, making a new horizontal support structure necessary.

When is it simpler? If you simply brick up the garage door opening or place a frame that fits within the existing concrete or steel surround, a steel structure is generally not required. The opening remains the same size and the load-bearing capacity of the facade does not change.

Structural calculation As soon as you doubt whether anything changes in the load-bearing capacity, a structural calculation is advisable and sometimes legally required. Tekenpunt works with its own structural engineer who prepares the calculation based on the drawings.

The process: from idea to completion

Converting a garage into living space proceeds in a number of steps. Tekenpunt helps with the drawings and the permit application; the execution is done with a contractor or building firm of your choice.

1. Intake and wishes You share your plans via WhatsApp or the quote form. Tell us what you want: a living room, bedroom, office or something else. If possible, send existing drawings or provide the dimensions.

2. Permit check Before Tekenpunt gets started, it is wise to carry out the permit check on the Omgevingsloket. This tells you whether an environmental permit is required and which activities fall under that application.

3. Drawings Tekenpunt makes the required drawings: floor plan existing and new, facade drawing existing and new, site plan and cross-section. You receive a draft version with the opportunity to provide feedback.

4. Permit application (optional as a package component) If an environmental permit is required, Tekenpunt handles the complete application with the municipality. The municipality legally has 8 weeks to reach a decision on a standard application.

5. Execution With the final drawings and the permit in hand, the contractor can get to work. The drawings contain all information about the new facade, the floor, the ceiling and the finish needed to bring the space up to Bbl requirements.

Delivery time Tekenpunt delivers by arrangement as standard (see your quote). If you are in a hurry, rush handling is available with a shorter delivery time, for a surcharge. Tekenpunt has existed since 2016 and has completed 930 projects.

Costs: drawing and package components

A construction drawing at Tekenpunt for converting a garage starts from €549 incl. VAT. The exact price depends on the scale of the project and the number of drawings required. Via the quote form on Tekenpunt.nl you will receive a tailored quote within 1 working day.

Besides the basic drawings there are package components you can add:

When do you need which package component?

• Environmental permit: in most cases this is required for a garage conversion, especially when the facade changes or the function of the space changes. Tekenpunt handles the complete application with the municipality.
• Structural calculation: required when the load-bearing capacity of the facade or the window opening changes, or when the municipality requires it as part of the permit application.
• 3D visualisation: useful if you want to see in advance how the new facade and furnished space will look, or if you want a contractor to provide a quote based on a visual reference.
• Rush service: choose this if you need to submit the application quickly or want the contractor to get started soon.

A municipality also charges fees for processing an environmental permit. The amount varies by municipality and depends on the construction costs. These are costs that are separate from the Tekenpunt price.

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