Apartment Renovations in Czechia: When Permits and Design Projects Apply

18.3.2026 | ARROWS law firm

Many apartment owners believe they can do whatever they want in their own apartment, but the Czech Building Act clearly sets out the rules for modifications that can be carried out without a permit as well as those requiring a design project. A wrong decision may expose you to a fine of up to CZK 2 million, an order to remove the construction, or legal disputes in the Czech Republic, so in this article we explain how to proceed correctly and when it is better to consult a specialist.

In the image, we see a specialist consulting on apartment renovation works.

Article contents

When you already need to apply for a permit
Interventions in load-bearing structures: Why a design project is required
Owners’ association and SVJ consent
Unauthorised construction and subsequent permitting
How to proceed correctly – step by step

Quick summary

Routine maintenance and most interior alterations (floor replacement, painting, new electrical outlets, and often even changes to non-load-bearing partitions) do not require a permit in the Czech Republic, provided they do not affect load-bearing structures, fire safety, or the external appearance of the building.
Interventions in load-bearing structures, changes to the external appearance (windows, façade), or a change of use require a permit from the Czech building authority (stavební úřad) (the so-called “project permit” / povolení záměru).
Not knowing the rules can cost you hundreds of thousands of Czech crowns in fines and in the costs of legalisation or demolition.

How to navigate the rules of the Czech Building Act

The Czech Building Act (No. 283/2021 Coll.) introduced changes to how building alterations in apartments are assessed in the Czech Republic. It abolished the previous dual-track system of “notification” (ohlášení) and “building permit” (stavební povolení) and introduced a single project permit (povolení záměru) (for simpler cases, a so-called accelerated procedure may be used).

The decisive factor is whether your planned alteration affects the building’s load-bearing structures, changes the appearance of the building, requires an environmental impact assessment, or affects fire safety. The practical issue is that the line between what qualifies as a so-called “minor structure” (drobná stavba) (no permit) and what already requires administrative proceedings can be thin. Czech building authorities assess impacts on structural integrity and safety strictly.

The attorneys at ARROWS, a Prague-based law firm, deal with Czech construction law on a daily basis and know what to watch out for in practice. Navigating these nuances is not easy – and a mistake can be expensive.

Building alterations that can be done without a permit

The basic principle is: maintenance works and building alterations that do not affect load-bearing structures, do not change the appearance of the building, do not require an environmental impact assessment, and do not negatively affect fire safety do not require a permit or notification to the Czech building authority. This falls within the category of so-called minor structures (drobné stavby). In practice, this means you can usually carry out without issues:

Replacing flooring and tiles – provided there is no major change in load on the floor structure.
Painting and wallpapering.
Replacing wall and floor cladding/tiling.
A new coat of paint on internal doors and frames.
Replacing electrical outlets and switches.
Installing interior lighting.
Replacing internal bathroom or kitchen fittings.
Alterations to non-load-bearing partitions – provided they do not serve a fire-safety function and do not affect structural integrity (we always recommend consulting a structural engineer).

A key condition is that the works must not compromise the stability of the building, fire safety, people’s health, or the appearance of the property. If you are unsure whether, for example, removing a partition could affect the building’s structural integrity or fire compartments, an expert assessment is essential.

When you already need to apply for a permit

Once your plans go beyond the threshold of a “minor structure”, you must obtain a project permit (povolení záměru). The Czech Building Act allows, in straightforward cases, for the permit to be issued in an accelerated procedure, which is procedurally simpler and has a 30-day decision period, provided you submit the consents of all parties and complete documentation.

You will typically need a permit if:

You intervene in load-bearing structures – demolishing load-bearing walls, creating new openings in load-bearing walls (“a door to the next room”), interventions in ceilings.
You change the appearance of the building – replacing windows with a different shape/division/colour, intervening in the façade (e.g., installing an air-conditioning unit on the façade), glazing a loggia/balcony.
You change the use – for example, converting non-residential premises into an apartment or vice versa, setting up business premises.
You affect fire safety – e.g., changing the apartment entrance door (fire doors), interventions in service shafts/risers.

Crucially, if you intervene in the common parts of the building (load-bearing walls, façade, vertical risers), you will need the consent of the unit owners’ association (SVJ) or the other co-owners. For the permit, you will need project documentation prepared by an authorised professional (designer), and the Czech building authority will assess compliance with applicable regulations.

Interventions in load-bearing structures: Why a design project is required

As soon as your plans affect structural integrity (load-bearing walls, ceilings, foundations), the law is uncompromising under Czech legislation. You must have a project permit supported by project documentation and a structural engineer’s report.

This includes:

Demolishing or weakening load-bearing walls.
Enlarging openings in load-bearing walls.
Increasing the load on the floor structure (e.g., a concrete floor instead of a wooden one, a heavy hot tub on a terrace).
Interventions in shared utility networks (main vertical risers for water, waste, gas).

The project must be prepared by an authorised engineer or architect. This is not a mere formality – the aim is to ensure the building does not collapse, and the Czech building authority verifies the safety of the solution in the permitting process.

Table of risks and sanctions for building alterations without a permit

Risks and penalties	How ARROWS can help (office@arws.cz)
Fine for construction alterations without a permit	Legal representation in administrative offence proceedings: ARROWS, a Prague-based law firm, will represent you, negotiate mitigation of penalties, and verify whether the authority’s procedure was procedurally correct under Czech law.
Order to remove the construction	Proceedings for a retroactive permit: The ARROWS Czech legal team will prepare and file the application for a retroactive permit and provide a legal analysis of whether legalisation is possible in the Czech Republic.
Problem when selling an apartment	Legal audit and settlement: ARROWS will help verify the legal status of the property and bring the documentation into line with the actual condition.
Compensation for damage to neighbours	Negotiation and court representation: We will negotiate compensation for damage and defend you against unjustified claims in Czech courts.
Loss of insurance coverage	Preparing and conducting a dispute with the insurer: ARROWS will assist with asserting the claim and interpreting the insurance terms and conditions.

Owners’ association and consent of the SVJ

If you own an apartment as a unit in a building, you must distinguish between the public-law level (the building authority) and the private-law level (relationships within the building). The Civil Code provides that a unit owner may not carry out alterations that endanger, change, or damage the common parts without the consent of the person responsible for managing the building (SVJ) or the other owners.

The SVJ (i.e., the meeting of owners) typically must approve alterations that:

Affect load-bearing structures.
Change the appearance of the building (windows, loggias/balconies, air conditioning on the façade).
Affect common utility lines (risers/vertical shafts).

Without this consent, you expose yourself to the risk of a lawsuit seeking an injunction or restoration to the original condition, even if you hypothetically had a stamp from the building authority (however, the authority usually requires such consent for a permit application). We recommend discussing the plan in advance with the SVJ committee. If the SVJ refuses consent without justification, a court may substitute its decision.

Illegal construction and a retroactive permit

If you carry out an alteration requiring a permit “under the table”, you risk the initiation of proceedings to remove the construction. The Building Act (Act No. 283/2021 Coll.) tightened the conditions for retroactive legalisation in the Czech Republic.

If the authority discovers unauthorised construction, it will initiate proceedings for its removal. Within these proceedings, you may apply for a retroactive permit. However, you must prove that the construction is not contrary to the zoning plan, the general requirements for construction, and that you have paid the fine for the administrative offence. If you do not meet the conditions, the authority will order the removal of the alterations.

Our attorneys in Prague at ARROWS can help you with a legal analysis of whether a retroactive permit is realistically achievable, and guide you through the legalisation process to minimise damage.

How to proceed correctly – step by step

Determine the scope of the alteration – am I affecting load-bearing walls? Am I changing the appearance of the building? Am I changing the layout and affecting fire safety?
Consult a specialist – a designer or structural engineer will tell you whether the intervention is technically feasible and whether it requires a permit under Czech law.
Inform the SVJ – if you are affecting common parts, obtain their consent.
Prepare the project documentation – if a permit is required, have the documentation prepared by an authorised professional.
Submit an application to the building authority – use the form for permitting the intended project (or apply for an accelerated procedure if you meet the conditions).
Wait for the decision – do not start construction before the permit becomes final and effective.
Carry out the construction and then obtain occupancy approval – if required for the type of construction, notify the commencement of use after completion or apply for an occupancy approval decision.

ARROWS, a Prague-based law firm, will guide you through the entire process. We have extensive experience in Czech construction law and know how to prevent complications.

Conclusion

Construction alterations to an apartment are not purely your private matter if they affect the building’s structure or the rights of others. The new Building Act brought a unification of permitting processes, but also stricter penalties. Taking the risk of building without a permit does not pay off.

If you are planning a renovation and want to be sure you are proceeding correctly under Czech law, contact us. Simply write to office@arws.cz and we will provide legal advice to protect you.

FAQ – Most common legal questions about apartment alterations without a permit

1. Can I buy materials without a permit?
Yes, purchasing and storing materials in an apartment is not subject to the Building Act in the Czech Republic. However, carrying out the construction works themselves is.

2. What if I find out that my apartment has unauthorised alterations from the previous owner?
As the current owner, you are responsible for the condition of the property. The authority may conduct proceedings against you. We recommend addressing the situation proactively—through legalisation (a retroactive permit). Contact us for an analysis of the appropriate steps under Czech law.

3. Do I need a permit for the insurance company?
Yes, insurers often exclude coverage in their terms and conditions for damage arising from constructions that were not carried out in compliance with legal regulations.

4. How high can the fine be?
For carrying out construction without a permit, an individual may face a fine of up to CZK 2,000,000 in the Czech Republic. The amount depends on the seriousness and scope of the construction.

5. Does replacing a prefabricated “umakart” core with masonry require a permit?
If you keep the layout and the new masonry (e.g., Ytong) does not cause a static overload of the slab (to be verified by a structural engineer) and you do not interfere with installation shafts (fire safety), it may qualify as minor works without a permit. However, if you change the layout, interfere with load-bearing elements, or shafts, a permit is required.

Notice: The information contained in this article is of a general informational nature only and is intended to provide basic guidance based on the legal situation as of 2026. Although we take maximum care to ensure accuracy, legal regulations and their interpretation evolve over time. We are ARROWS advokátní kancelář, an entity registered with the Czech Bar Association (our supervisory authority), and for maximum client protection we maintain professional liability insurance with a limit of CZK 400,000,000. To verify the current wording of regulations and their application to your specific situation, it is necessary to contact ARROWS advokátní kancelář directly (office@arws.cz). We accept no liability for any damages arising from the independent use of the information in this article without prior individual legal consultation.

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