A roof renovation covers all the work needed to bring an existing roof back into sound condition. Depending on its state, this includes renewing the covering (tiles, concrete tiles, sheet metal or flat-roof waterproofing), the sub-roof, the thermal insulation and the metalwork such as gutters, valleys and flashings. The goal is a watertight, well-insulated and durable roof.\n\nThe process usually starts with a condition survey by a roofer or roofing specialist. This is followed by a quote, scaffolding, removal of the old layer, any repairs to the structure, laying of insulation and the sub-roof membrane, and finally the new covering including metalwork. Weather protection during construction is essential so that no moisture enters the building.\n\nA renovation becomes necessary in the case of leaks, weathered or broken tiles, moss growth, poor insulation, or simply when the roof has reached the end of its service life. The opportunity is often used to add better insulation or a photovoltaic system.\n\nLook for a qualified contractor with references, a detailed quote listing materials, correct insulation values and clean flashings. Common mistakes include a missing vapour barrier, inadequate ventilation and cutting costs on the sub-roof. Clarify building permits and possible subsidies early on.
Roof renovation
A roof renovation is the comprehensive repair or renewal of an existing roof to restore its water-tightness, insulation and structural integrity. It ranges from re-covering individual areas to fully renewing the covering, sub-roof, insulation and metalwork.
Example
In a 1970s single-family home in the Zurich Oberland, damp patches appeared on the bedroom ceiling after a storm. The roofing contractor who was called in found broken tiles and a missing sub-roof. As part of the roof renovation, the roof was re-covered, a diffusion-open sub-roof was installed and the on-roof insulation was reinforced, which also lowered heating costs.
Frequently asked
When does a roof need to be renovated?
Signs include leaks, damp patches on ceilings, broken or slipped tiles, heavy moss growth and noticeably poor insulation. Age also matters: many roofs reach the end of their service life after several decades. When in doubt, a professional condition survey is worthwhile.
How much does a roof renovation cost?
Costs depend heavily on the roof area, roof shape, chosen materials, insulation, the condition of the structure and the scaffolding required. Simply re-covering is cheaper than a full renovation with new insulation. Obtain several detailed quotes so you can compare prices properly.
Do I need a building permit for a roof renovation?
This depends on your municipality and canton as well as the scope of the work. Simply re-covering in the same colour and shape is often permit-free, whereas changes to the appearance, roof structures or a photovoltaic system may require notification. Clarify this in advance with your municipality or contractor.