In a brick or panel building, a cable hidden inside a chased channel under plaster is surrounded by non-combustible material. In a wooden house, that same concealed routing puts the wire inside or right next to a combustible structure, so any local overheating or damaged insulation has a better chance of turning into a fire that is hard to spot early.
Because of this, the approach to wiring a wooden house differs from a standard apartment — and the difference is not only about materials, it is about the whole logic of how the cable is routed.
Why wood changes the requirements for wiring
Wood is combustible, and if a cable overheats or a poor connection sparks, fire spreads faster and more invisibly inside this kind of structure than through brick or concrete. Concealed wiring inside a wooden wall or floor limits how heat escapes from the cable and makes it harder to visually check the insulation's condition — a fault can go unnoticed until there is a smell of burning or smoke.
That is why codes and practice around wiring wooden houses emphasize routing methods that minimize the cable's contact with combustible material and let a problem be spotted quickly.
Surface-mounted wiring in cable channels — why it's often chosen
Surface mounting — running the cable along the wall surface inside a protective trunking or cable channel instead of hiding it inside the structure — is preferred over concealed wiring in many wooden houses. This approach has several practical advantages: the cable is accessible for inspection and replacement without opening up walls, a connection point or damage is easier to find, and the channel itself adds a layer of protection by physically separating the wire from the wood.
Surface-mounted wiring does not have to be an aesthetic compromise — modern cable channels can be matched to wall color or routed along the baseboard and corners, so the solution stays practical without becoming a visual problem.
Concealed wiring in wood — when and how it's done
Giving up concealed routing entirely is not always possible or necessary — sometimes it is still used, but with extra measures: the cable runs inside a metal conduit or non-combustible casing that physically isolates the wire from the wood and can contain a spark from a short circuit. This raises the cost and labor of installation compared with surface mounting, but it preserves the usual clean look of the walls where that matters.
Breakers, RCDs, and the panel in a wooden house
Protective devices get extra attention in a wooden house: working breakers and a correctly sized RCD cut power to a circuit on overload or current leakage before a fault has a chance to turn into a fire. The panel itself, where possible, is not mounted directly onto a wooden wall without a non-combustible backing, and its condition — solid connections, no signs of scorching — is worth checking more often than in a brick house.
Comparing surface and concealed mounting in a wooden house
| Criterion | Surface mounting (cable channel) | Concealed mounting (conduit inside the wall) |
|---|---|---|
| Inspection and maintenance | Cable is visible, easy to check and replace | Requires opening the wall for access |
| Contact with wood | Minimal — the channel separates the wire from the wall | Wire sits inside the structure, needs extra conduit protection |
| Cost and time | Usually lower and faster | Higher due to the conduit and chasing |
| Appearance | Channel is visible, can be matched to the interior | Wall stays completely clean |