Why Solar Panels Can Change a Roof Refurbishment Project

Solar panels are becoming an increasingly common feature on commercial, public-sector and residential buildings. While they offer significant long-term energy benefits, they can also introduce additional considerations when roofing works are required.

Many building owners assume solar panels can simply be installed onto an existing roof structure. However, in reality, solar installations often influence refurbishment decisions, structural requirements and long-term maintenance planning.

Understanding these factors early can help avoid unexpected costs and delays during roofing projects.

The Existing Roof Must Be Suitable

Before solar panels are installed, the condition of the existing roof should be assessed.

Common considerations include:

• Remaining roof lifespan

• Waterproofing condition

• Structural integrity

• Existing defects

• Maintenance requirements

Installing solar panels onto a roof nearing the end of its service life can create significant complications if refurbishment becomes necessary shortly afterwards.

A professional Roof Survey can help identify whether the roof is suitable for a future solar installation or whether refurbishment should be completed first.

Additional Weight Must Be Considered

Solar panels add loading to the roof structure.

While individual panels may not appear particularly heavy, the combined weight of:

• Panels

• Mounting systems

• Ballast systems

• Associated equipment

can create additional structural demands.

Older buildings may require further investigation to ensure the roof can safely accommodate the proposed installation.

Refurbishment Projects Often Reveal Hidden Issues

One of the challenges with older roofs is that hidden defects may only become apparent once works begin.

These can include:

• Deteriorated decking

• Structural movement

• Moisture-damaged substrates

• Historic repairs

• Timber deterioration

Addressing these issues before solar panels are installed can help protect the long-term performance of both the roof and the solar system.

Waterproofing Must Remain a Priority

Solar panels do not eliminate the need for a high-performing roofing system.

In fact, the roofing system beneath the panels often becomes more important because future repairs can be more complex once solar infrastructure is in place.

Many organisations choose to undertake Pitched Roofing Solutions or refurbishment works before installing solar panels to maximise the lifespan of both systems.

Real Projects Demonstrate the Importance of Planning

Our Fortune House Case Study highlights how solar panel installations can influence a refurbishment project.

During the refurbishment of the ageing pitched roof system, structural strengthening works were required to ensure the building could safely support the new PV installation. Additional investigations also identified substrate issues that needed to be addressed before the roof could provide reliable long-term performance.

By dealing with these challenges during the refurbishment programme, the building was left with a durable roofing system capable of supporting its future energy requirements.

Planning Early Helps Avoid Costly Changes

The most successful solar projects are those where roofing and structural considerations are assessed from the outset.

Early investigation can help identify:

• Structural requirements

• Roof condition issues

• Waterproofing concerns

• Access constraints

• Future maintenance needs

This reduces the risk of unexpected discoveries once installation works are underway.

Solar Panels and Roofing Should Be Considered Together

Solar panels can provide significant long-term benefits, but they should never be viewed separately from the roof beneath them.

A well-planned refurbishment programme can ensure the roofing system, structure and solar installation work together to deliver long-term performance, energy savings and asset protection for years to come.