Restoration of building carpentry in protected and heritage buildings

Not all carpentry work is about building new. A large part of the trade is done on buildings that have already stood for decades or centuries, and where the task is not just to repair but to preserve. Denmark has around 355,000 heritage buildings and approximately 7,100 listed buildings, which place special demands on the craftsmanship carried out on them.

§Protected or conservation-worthy — what's the difference?

A protected building requires prior permission from the Slots- og Kulturstyrelsen (Palace and Cultural Authority) before any changes may be made to it — even carpentry work like replacing windows or stairs. A building of preservation value is instead registered by the municipality based on a so-called SAVE assessment and typically has local planning requirements for how changes must be made without requiring the same permission as with a protected building.

§Window cultural historical value

A window's profiles, divisions, glass type, and hardware tell something about when it was made and therefore have significant cultural-historical value in an older building. A new window with modern profiles and single-pane glass can markedly alter an old building's appearance, even if it is an energy improvement.

§Secondary glazing as a solution

The Slots and Cultural Heritage Agency often recommends secondary windows or coupled windows as a solution for protected and heritage buildings. The solution provides a marked energy improvement without changing the building's original appearance because the original window is preserved as a visible outer surface.

§Materials and methods in restoration work

• 01Use of heartwood, which has better durability than sapwood
• 02Recreation of traditional profiles and cut surfaces
• 03Glazing or glass glazing where it is historically correct
• 04Historically correct glass in the most valuable categories of buildings (category 1-4)

§The carpenter's role in preservation work

To work with restoration requires more than ordinary carpentry — it requires an understanding of material history cooperation with conservation authorities and often a patience that new production does not place the same demands on. For many building carpenters restoration work becomes a specialization that combines craftsmanship with a form of detective work in the building's history.