Finland’s new Building Act, together with the Ministry of the Environment (YM) and the Helsinki metropolitan area building authorities (RAVA / RAVA3Pro), require a standard-compliant data model. Our design target is a BIM model attached to the building permit application that can be used directly for authority checking, energy assessment and the national Ryhti data system.
A target, not an approval: this page describes the generator’s design targets. The permit and the data model are always approved by the competent building authority.
Legislation
Two requirements define what a permit attachment’s data model must deliver.
Drawings are submitted as an open-standard IFC data model. Municipal building authorities validate the model and forward its data automatically to the national Ryhti system maintained by the Ministry of the Environment and Syke.
Our design target is a model the receiving authority can inspect without manual interpretation: geometry, units and space data in one schema-compliant structure.
The model is designed to contain the main drawing data (floor areas, volumes), the input values for the energy assessment (envelope areas, U-values, orientations) and the material and mass basis required by the climate report and material schedule.
When the inputs live in the model instead of separate spreadsheets, the same data serves permit handling, energy calculation and later maintenance of the project.
RAVA3Pro
Four technical blocks that municipal model checks rely on. Open a section to see how the generator is designed to deliver it.
The primary requirement is IFC4 (Reference View V1.2). Length is expressed in exact metres (.METRE.) with three-decimal tolerance, so municipal area calculations are not distorted the way they often are in millimetre models.
The unit assignment is written at project level (IfcUnitAssignment), so every element is interpreted at the same scale.
An intact hierarchy: Project, Site, Building, Storey. Storey elevation corresponds to the N2000 height system at floor level.
No orphan elements: every wall, slab, roof and opening is linked to its storey through IfcRelContainedInSpatialStructure, so a checker always finds an element under a storey.
Every room is modelled as its own IfcSpace object and grouped into thermal zones. Municipal automated checks compare these against the areas in the 2D drawings.
Lamit models are sized with the target that room areas match the main drawings, so discrepancies do not surface during permit handling.
The external envelope is separated strictly (IsExternal = TRUE). Base slabs are typed with BASESLAB and roofs with ROOF.
Windows and doors are cut into walls with proper IfcOpeningElement relations rather than direct wall breaks, keeping envelope geometry and areas intact.
Mapping
Line by line: what the authority requires, the standard criterion, and how the generator is designed to deliver it.
| RAVA / YM requirement | Standard criterion | A-Nodes 2D-to-IFC generator | Target |
|---|---|---|---|
| IFC schema | IFC4 Reference View | Written directly as FILE_SCHEMA(('IFC4')) | Met |
| Units | Length: metre (.METRE.) | IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.) | Met |
| Height system | N2000 floor level per storey | Storey.Elevation = 45.5 read from the section | Met |
| Base slab type | Ground contact identifiable | IfcSlab.PredefinedType = .BASESLAB. | Met |
| U-value data | Present on envelope elements | Pset_SlabCommon, Pset_WallCommon, Pset_RoofCommon | Met |
| Space data | Room-by-room breakdown | 1+n IfcSpace objects (LIV/R, BED, WORK etc.) | Met |
| Thermal design | Machine-readable design values | Pset_SpaceThermalDesign (T_i, W, W/m²) | Exceeds code |
The matrix describes the generator’s design targets and implementation. It is not an authority approval and does not guarantee passing automated checking: final approval always rests with the building authority, and every project is validated separately.
Climate report
So that the model also serves the climate report required by the new Building Act and full permit readiness, Lamit’s generator uses the Talo 2000 building classification (IfcClassificationReference). True north is bound to the model coordinate system for passive solar calculations. Masses and volumes are derived directly from the model’s construction layers (concrete, timber, insulation) into the material schedule of the statutory carbon footprint calculation.
IfcClassificationReference binds building parts to the national code list, making quantities and materials machine-readable.
True north rotation is part of the model coordinate system, so passive solar and shading calculations repeat on the same geometry.
Masses and volumes are derived from construction layers into the carbon footprint material schedule without separate take-off work.
Tell us the format of your source material (paper drawing, 2D PDF/DWG or native IFC) and we will walk through the RAVA targets and the delivery format for your project.