Building Legalization 2026: Conditions, Costs, and Procedure
If you have an illegally constructed building in Croatia, the most important thing to clarify right away is this: not every building can be legalized.
Legalization is the procedure by which an illegally constructed building is incorporated into the legal system, but exclusively if it meets the conditions prescribed by law.
Status of Legal Amendments (2026)
At the time of writing this text, the announced amendments to the legal framework regarding legalization have not yet come into force.
These are proposed amendments which, among other things, foresee the removal of the time limit for submitting requests and additional digitalization of the procedure.
Although the amendments are not yet active, their direction is clear, and in practice, it means that a new cycle for submitting requests will open at some point.
Experience from previous similar processes shows that in such situations, the following occurs:
- a sudden increase in the number of cases in a short time
- longer processing times at the competent offices
- increased demand for surveying and design services
Therefore, it is generally recommended that preparatory actions (checking documentation and the possibility of legalization) be done in advance, so that the procedure can be started without delays when the amendments come into force.
Can you legalize your building?
A building can be legalized if it was built by June 21, 2011, and if it meets the basic conditions of visibility and construction.
In practice, this means:
- it was built before June 21, 2011
- it is visible on official orthophoto images
- it has basic building elements (walls and roof)
- it is not on maritime domain, public area, or a protected area
If any of these conditions is not met, legalization is not possible.
How much does legalization cost?
The cost depends on the size and complexity of the building, but in practice it falls within the following ranges:
- smaller buildings: €800 – €1,500
- family houses: €3,000 – €7,000
- larger buildings: €6,000 and up
The cost consists of:
- surveying elaboration
- project documentation (if required)
- utility contribution
- water contribution
The largest part of the total cost is typically made up of statutory contributions, not the documentation itself.
How long does the procedure take?
The duration of the procedure cannot be precisely determined in advance because it depends on several factors:
- the number of requests received at the competent office
- the workload and capacity of the services
- the tidiness and completeness of the documentation
- the complexity of the building itself
According to the announced amendments to the legal framework, requests will be submitted digitally, which should speed up the initial administrative processing. However, the total duration still depends on the system's workload at the time the case is processed.
What does the procedure look like?
In practice, the procedure proceeds through several phases:
- checking the possibility of legalization
- creation of a geodetic survey
- creation of necessary documentation
- submission of the request
- issuance of a decision
- entry into the cadaster and land registers
The most important step is always the initial check, because only then can the cost-effectiveness and feasibility of the procedure be realistically assessed.
What if the building was extended?
If the building was extended or reconstructed after June 21, 2011, that intervention cannot be legalized.
For such interventions, it is necessary to obtain a building permit, because under current regulations, they are considered new construction or reconstruction.
Most common situations
- building built before 2011 → can be legalized
- building partially extended → building permit required
- building built after 2011 → cannot be legalized
- building built before 1968 that was extended before 2011 → can be legalized
- building built before 1968 partially extended after 2011 → building permit required
When does it make sense to start the procedure?
The biggest mistake in practice is waiting until legalization becomes an urgent obligation.
At that point, the procedure usually comes under time and financial pressure, and the ability to choose contractors and the optimal solution decreases.
If you know the building is illegal and plan to use it long-term, it is rational to start the procedure before it becomes a condition for:
- selling the property
- a loan or mortgage
- resolving property legal relations
Frequently Asked Questions
Can a building be legalized without a building permit?
Yes, if it meets the conditions prescribed by law. That is the basic purpose of the procedure.
What if the building is not visible on the images?
If the building is not visible on the official images, the procedure becomes more difficult and may be impossible. In that case, it is necessary to gather additional documentation and contact the competent administrative body for construction to determine acceptable evidence and the possibility of continuing the procedure.
Can an extension be legalized?
No, if it was carried out after June 21, 2011. For such construction, a building permit is required.
Is legalization worth it?
In most cases, yes, because an illegal building has limited market and legal value.
Conclusion
Legalization is possible only if the building meets the legal conditions and is correctly positioned within the record-keeping system.
The most important decisions are made at the beginning:
- can the building be legalized?
- what is the estimated cost?
- how feasible is the procedure in your specific case?
If these answers are clear, the procedure is predictable. If not, the first step is always a professional check before any investment of time and costs.
