Building a Balcony: How Much Does It Cost?

Adding a balcony later costs an average of €10,850.

In general, the price for retrofitting a balcony ranges between €6,900 and €14,800.

A balcony addition is a true luxury feature for your home. If you own a house or an apartment and wish to have a balcony, the process may be easier than you think.

For instance, you can choose a self-supporting (freestanding) balcony, available as a prefabricated kit. Partially or fully load-bearing balconies are more expensive since they require more construction work.

It’s highly recommended to get professional assistance, to ensure the balcony is structurally safe and compliant with building regulations—especially for partially or fully load-bearing balconies, where the static calculations are complex.

Factors Affecting the Total Cost

• Type of balcony

• Structural features of your building

• Chosen railing

• Type of balcony door

• Labor costs (depending on skill and experience)

Do I Need a Building Permit?

Yes, in most cases a building permit is required. You can apply for it at your local building authority.

For condominiums, you’ll also need approval from all property owners before construction can begin.

Material Costs

The largest portion of expenses in a balcony addition usually comes from materials, which include:

• The balcony itself

• The railing

• The balcony door

Your choices here significantly affect the total cost. Not every type of balcony fits every building, so it’s best to follow the advice of an experienced contractor who can recommend feasible options.

▫️ Self-Supporting (Freestanding) Balcony

A self-supporting balcony starts at around €1,000 per m².
It stands on four posts and is only anchored to the façade for stability — making it simpler and more affordable to install.

▫️ Partially Self-Supporting (Attached) Balcony

If you prefer fewer support posts, a partially self-supporting balcony (also called an attached balcony) is a good choice.
It usually has two posts and is anchored into the house wall.

Expect to pay around €1,200 per m².

▫️ Cantilever Balcony

If supports are not possible (e.g., over driveways, pathways, or water), a cantilever balcony is an option.
It requires no posts, but is structurally complex — a structural engineer must verify the load-bearing capacity of the walls and ceilings.

This complexity is reflected in the price: €5,000–€6,000 on average.

Balcony Railing Costs

Balcony Door Costs

Labor Costs

In addition to materials, labor costs are required for the construction and installation.

For a prefabricated or attached balcony, including wall anchoring, expect €3,000–€3,500.

A cantilever balcony is significantly more expensive — professional firms typically charge around €5,000 or more.

Creating a wall opening and installing the balcony door costs €600–€1,000.
If a radiator must be removed, add about €200.

Possible Additional Costs

Other extra costs may include:

• Structural analysis: €500

• Building permit: €400–€600

• Travel costs: €40–€60

• Delivery costs (depending on supplier)

Example Calculation: Adding a Balcony

Example: Retrofitting a 3 m² balcony to an existing house.