Norwegian Building Regulations: One National Rule Book on Chippy Tools

Norway Minimum Roof Fall (TEK17 §13-12): The 1:40 Rule

Mon, 10 Aug 2026 00:00:00 +0000

The requirement

For membrane roofing, Norway’s minimum fall is 1:40 (about 2.5%, or 1.4 degrees). That number sits in DiBK’s guidance under TEK17 §13-12, not in the rule itself. The clause only asks for “tilstrekkelig fall”, meaning sufficient fall. Tile and metal get no number here.

Roof fall is how steep a roof is. Lay it too flat and water sits on the roof instead of running off. TEK17 §13-12 “Nedbør” (precipitation) covers this. It is a performance rule. The roof must have enough fall so rain and meltwater drain away. Water must not pool or work back under the roofing. How much fall counts as “sufficient” sits in the guidance below the clause.

Norway's Wet-Room Rules: TEK17 §13-15, a Real Statutory Clause

Mon, 10 Aug 2026 00:00:00 +0000

The requirement

TEK17 §13-15 is Norway’s wet-room clause. It asks for three things. The floor must fall to the drain. Leak water must be led to a spot you can see. Weak surfaces must be waterproofed, with every hole sealed. The clause gives no figures. Those sit in Våtromsnormen and the SINTEF Byggforsk 520-series.

Norway stands out here. The wet room gets its own named clause in the building law itself. The UK’s Approved Document C says nothing about wet rooms. Ireland’s TGD C is silent too. Norway’s clause is TEK17 §13-15, “Våtrom og rom med vanninstallasjoner” (Wet rooms and rooms with water installations). It sits in the Byggteknisk forskrift, the national building regulation. DiBK (Direktoratet for byggkvalitet) runs that regulation. DiBK also attaches guidance (veiledning) to §13-15. The guidance spells out what the clause covers. It stops short of giving a number.

Norwegian Foundation Depth & Width: Why TEK17 Sets No Fixed Number

Mon, 10 Aug 2026 00:00:00 +0000

The requirement

TEK17 sets no fixed footing depth, width, concrete grade or rebar cover. There is no frost-line rule and no metre figure in the code. §10-2(3) hands all of it to design under the Eurocode standards. Depth and width come from your site’s ground and loads, not from the regulation.

Foundation design sits under TEK17 Chapter 10, the structural safety chapter, at §10-2. That clause covers the basic requirements for a structure’s mechanical resistance and stability, including ground conditions. It routes them to the Eurocode series with the Norwegian National Annexes. That means NS-EN 1990 for the basis of design, plus NS-EN 1991 through NS-EN 1999. For footings and ground, the key one is NS-EN 1997, Eurocode 7. It covers the geotechnical design. No metre figure is printed in TEK17 or its official guidance, the veiledning.

Norwegian Ramp Gradients: TEK17 §12-16

Mon, 10 Aug 2026 00:00:00 +0000

The requirement

The maximum ramp gradient in Norway is 1:15. A short ramp can be steeper: 1:12 is allowed when the run is under 3.0 m. That is TEK17 §12-16(2). The same rule covers every ramp on a dwelling. There is no separate figure for an accessible ramp.

Norway sets one rule for ramps, not several. TEK17 §12-16 covers them all. Some countries split “general” ramps from “accessible” ones. Norway does not. Get the gradient right here and it holds for any ramp.

Norwegian Room Height, Light & Ventilation Rules (TEK17)

Mon, 10 Aug 2026 00:00:00 +0000

The requirement

A habitable room in a Norwegian dwelling needs a ceiling height of at least 2.4 m. TEK17 §12-7(2)(a) fixes that number. Rooms you do not live in, such as a hallway or store room, need 2.2 m (§12-7(2)(b)). Small one-storey homes get a lower figure. And there is no minimum room area at all.

A habitable room (rom for varig opphold) means a bedroom, a living room or a kitchen. Parts of a room may sit lower than the minimum, say under a sloped ceiling. TEK17 puts no limit on how much of the room can be lower. The room as a whole still has to work (§12-7(2)(d)).

Norwegian Stair & Guard Rules: Going, Headroom, Handrails (TEK17)

Mon, 10 Aug 2026 00:00:00 +0000

The requirement

A Norwegian stair needs a going of at least 0.25 m on the walking line. Riser and going must fit 2R + G = 0.62 m ± 0.02 m. Headroom is 2.1 m, or 2.0 m inside a single dwelling unit. Stair guards need 0.9 m. It all sits in TEK17: §12-14 for stairs, §12-15 for guards.

TEK17 is the Byggteknisk forskrift, the building rule for all of Norway. Direktoratet for byggkvalitet writes the veiledning to those sections. It holds the numbers a kommune accepts without argument. Build to them and you are safe.