Minor Structure

What is a minor structure under Slovakia's current Building Act?

A minor structure (drobná stavba) is a small, single-story building that can be constructed under simplified procedures in Slovakia. Under the Building Act 25/2025 (effective April 1, 2025), a minor structure is defined as a building with a maximum floor area of 50 m² and a maximum height of 5 m that does not substantially affect its surrounding environment or character. Examples include garden sheds, summer kitchens, detached garages, tool storage, small family cottages, and utility structures for keeping animals. The significance of the minor structure category lies in its streamlined approval process: instead of navigating full Building Intent proceedings, owners need only submit a notification to the building authority and can proceed once verification is obtained or the 30-day review period expires.

How did the definition and thresholds change under the 2025 act?

The 2025 Building Act significantly expanded the minor structure category, reflecting a policy shift toward reducing administrative burden on small projects. Under the old Building Act 50/1976, a minor structure was limited to 25 m² of floor area. The new Act 25/2025 doubled this threshold to 50 m², effective April 1, 2025. This change means that many structures—such as family cottages, larger sheds, and residential outbuildings—that previously required a full building permit now qualify for streamlined notification procedures. The expansion reflects recognition that structures up to 50 m² typically pose minimal planning or urban-design impact and do not warrant the months-long formality of traditional building permitting. This transition has been particularly significant for residential property owners in Slovakia seeking to add ancillary structures to their land.

Aspect	Old Act (50/1976)	New Act (25/2025)
Maximum floor area for notification-only approval	25 m²	50 m²
Exemption threshold (no permit or notification required)	15 m² (with setback, varies by source)	25 m² (with 2 m setback from property boundary)
Maximum height	Not explicitly stated	5 m for surface structures; 3 m depth for underground
Approval procedure for 25–50 m² structures	Full building permit required	Simplified notification (30-day review)
Owner self-execution permitted	Limited; professional involvement required for most projects	Yes; owner can self-execute minor structures directly
Effective date	1976 (50 years in force)	April 1, 2025

Structure Type	Size/Depth Limit	Required Procedure	Notable Conditions
Surface minor structures (sheds, garages, cottages, etc.)	Up to 50 m² floor area; up to 5 m height	Notification to building authority	Must comply with local zoning and obtain binding statements from utilities
Very small surface structures	Up to 25 m² floor area; up to 5 m height	No notification or permit required IF at least 2 m from property boundary	Exemption from authority notification; must still respect setback requirement
Underground structures (basements, pools, septic tanks)	Up to 25 m² floor area; up to 3 m depth	Notification to building authority	Typical for residential utilities and recreational features
Fencing	Up to 1.6 m (opaque); up to 2 m (transparent/lightweight)	Notification or exemption depending on height	Height limits may vary by local regulations and proximity to property lines

What are the procedural and documentation requirements for building a minor structure?

Unlike Building Intent proceedings, which require comprehensive design documentation and formal proceedings, minor structure notification follows a simpler path. The owner must prepare a "project of structure for notification" (ohlásenie stavby na ohlásenie), which includes architectural and technical drawings sufficient to identify the structure's location, dimensions, and essential design parameters. Before submitting the notification, the owner should obtain binding statements and opinions from affected authorities—typically network operators (water, electricity, gas, telecommunications), heritage protection authorities if the property lies in a protected zone, and hygiene inspectors if required by local rules. The notification, along with proof of ownership (cadastral extract) and the project drawings, is submitted to the municipal building office, either electronically through the URBION information system or in paper form. The building authority then has 30 days to verify the notification and issue a verification decision. If the authority does not issue a decision within this period, the verification is deemed to have been issued automatically, recorded in the information system, and construction may commence. Importantly, the owner may self-execute the minor structure without hiring a professional contractor, though professional construction supervision (stavbyvedenie) is not mandatory as it is for larger projects.

What structures are exempt from notification or permit requirements?

Not all small structures require notification. The Building Act carves out a category of structures not requiring a building permit, and minor structures up to 25 m² qualify for exemption under specific conditions. Any single-story structure with a floor area not exceeding 25 m² that is situated at least 2 m away from the property boundary requires neither a building permit nor notification to the building authority. This exemption reflects the principle that very small, setback structures pose negligible planning impact. However, even exempt structures must comply with all other applicable regulations, including local zoning rules, heritage protections, and building codes. Owners should verify local municipal requirements, as some municipalities may impose stricter conditions or require advisory consultations even for exempt structures. Additionally, structures that exceed 50 m² in floor area, exceed 5 m in height, or violate setback requirements are no longer classified as minor structures and must proceed through full Building Intent proceedings, which require comprehensive design documentation and formal authority review.

How do minor structures differ from other simplified building procedures?

The minor structure notification procedure sits at the simpler end of Slovakia's building approval spectrum. Structures that exceed minor structure thresholds but remain relatively simple—such as residential buildings under 300 m² or certain recreational structures—are classified as "simple buildings" and require formal Building Intent proceedings with comprehensive design documentation and final inspection, even though the procedures are streamlined compared to major projects. This distinction is crucial: not every structure up to 50 m² is automatically a minor structure; functional use and design complexity matter. A 45 m² residential cottage, for instance, might be classified as a "simple building" rather than a minor structure, triggering full approval requirements. Additionally, structures in heritage zones, protected landscapes, or areas subject to special building restrictions (such as flood plains or utility protection zones) may require upgraded procedures regardless of size. The minor structure category is defined by both dimensional thresholds and functional characteristics—it encompasses only those buildings genuinely incapable of substantial environmental or planning impact.

What common misconceptions exist about minor structures?

A frequent misunderstanding is that size alone determines classification. Many property owners assume any structure under 50 m² qualifies for notification procedures; in reality, the 2-meter setback requirement and functional classification can override size. A small cottage located only 1 m from a property line, for example, would not qualify for the exemption and would require notification instead. Another misconception is that notification is optional; in fact, structures between 25 and 50 m² must notify the authority—failing to do so constitutes an unpermitted structure. Some owners also believe that minor structure notification eliminates all documentation and authority review; while the process is streamlined, binding statements from utilities and compliance with zoning and heritage rules remain mandatory. Finally, some assume the 30-day verification period is a deadline for starting construction; in practice, the owner should wait for explicit verification or confirmation that 30 days have elapsed before mobilizing on site, as starting work without authority awareness creates legal risk. For structures in Slovakia's growing sustainable housing sector, minor structure designation may seem attractive, but designers should verify whether energy performance documentation, airtightness testing, or other requirements apply based on local subsidy programs (such as Obnov Dom) or voluntary passive-house certification—these overlays may impose additional documentation beyond the basic notification requirement.