STR 1.01.03:2017 – Classification of Buildings and Premises in Lithuania
The technical construction regulation STR 1.01.03:2017 titled Statinių ir patalpų klasifikavimas (Classification of Buildings and Premises) is a mandatory regulatory instrument issued by the Ministry of Environment of the Republic of Lithuania. This consolidated version, effective from May 21, 2025, incorporates amendments including those from Order No. D1-197 of June 14, 2024. The document functions under the legal authority of Article 4, Part 3 of the Law on Construction and serves as the official framework for registering real estate objects in the Real Estate Cadastre and Real Estate Register.
The regulation governs the classification of buildings, individual premises formed as separate real estate objects, and engineering structures based on their intended use, functional characteristics, and technical parameters. It provides the definitive criteria for categorizing structures into Extraordinary (ypatingieji), Simple (nesudėtingieji), and Non-extraordinary (neypatingieji) buildings. The document is structured into several chapters and six comprehensive annexes that detail specific classification codes, technical thresholds for building categories, and the procedure for changing the recorded primary use of a building or room.
Professional users, including architects and municipal planners, rely on this regulation to determine project requirements, permit procedures, and compliance with zoning laws. The following sections detail the core classification principles and the technical thresholds defined within the official annexes of the regulation.
General Classification Principles
Buildings are classified into two primary types: Residential and Non-residential. These are further subdivided into purpose groups and specific uses. For buildings containing rooms of various purposes, the primary use is determined by the largest total area of a specific use type.
- Monofunctional Buildings: Structures where rooms of a different purpose group occupy no more than 1/5 of the total floor area.
- Polyfunctional (Mixed) Buildings: Structures where rooms from other purpose groups exceed 1/5 of the total floor area.
- Sub-blocked Buildings: Two or more buildings touching through external walls but possessing independent foundations, walls, and engineering systems.
Technical Criteria for Extraordinary Buildings
Annex 4 of the regulation defines specific technical parameters that require a structure to be classified as Extraordinary. This status applies to both residential and non-residential buildings meeting any of the following thresholds:
- Height: Buildings reaching 20 meters or more.
- Depth: Underground structures reaching 7 meters or more below the average ground level.
- Spans: Buildings with load-bearing structures spanning more than 12 meters between supports.
- Cantilevers: Structures with load-bearing cantilevered parts protruding more than 3 meters from the facade.
- Area: Buildings with a total area exceeding 2000 square meters.
Simple Structures and Categorization
Simple structures are divided into Group I and Group II based on their dimensions and complexity. Annex 5 provides the maximum height and area limits for these categories.
- Single-family and Duplex Houses: Classified as Group II if they do not exceed a height of 5.0 meters and a total area of 50 square meters.
- Farm Buildings: Group I limits are 5 meters height and 50 square meters area; Group II limits are 8.5 meters height and 80 square meters area.
- Garden Houses: Classified as Group I with a maximum height of 5.0 meters and area of 50 square meters.
Engineering Structure Groups
Engineering structures are classified into groups including communication lines, engineering networks, and hydrotechnical structures. Each group is detailed in Annex 3 with specific descriptions for cadastre registration.
- Communication structures: Roads, streets, railways, and airport runways.
- Engineering networks: Oil, gas, water, heat, and electricity supply lines, including telecommunications.
- Hydrotechnical structures: Dams, hydroelectric plants, and embankment walls.
- Renewable energy: Wind power plants and solar energy collectors.
Frequently Asked Questions
What defines a building as 'Extraordinary' based on its height?
A building is classified as extraordinary if its height is 20 meters or more, as specified in Annex 4 of the regulation.
How is the primary use of a mixed-use building determined?
The primary use is determined by the largest total floor area of the specific room types formed as separate real estate objects within the building.
What is the area limit for a Group II simple farm building?
A Group II simple farm building without residential rooms (excluding greenhouses) has a maximum total area of 80 square meters.
At what span length does a building become classified as extraordinary?
A building becomes extraordinary if the distance between its load-bearing supports (openings) exceeds 12 meters.
What are the restrictions for basements in simple structures?
Basements in simple structures cannot extend beyond the building's perimeter and must not exceed one story in height.
When is a structure considered a 'Sub-blocked building'?
When two or more buildings touch via external walls but each has its own foundations, walls, roofs, and independent engineering system inlets.
What is the '1/5th rule' for mixed-use buildings?
If rooms belonging to other purpose groups occupy more than 1/5 of the building's total area, it is considered a mixed or polyfunctional building.
Are wind turbines classified as buildings or engineering structures?
Wind turbines are classified as engineering structures under the category of 'Other engineering structures' specifically for renewable energy production.
