In-roof vs on-roof solar is primarily a choice about how the array fits into the building. On-roof panels sit above the existing covering on a designed mounting system. In-roof panels form part of an integrated weatherproofing arrangement.
Which suits an existing roof?
On-roof mounting can be a practical option where the covering is sound and suitable. A survey should still assess structure, fixings, access and the roof’s likely remaining life. Installing solar shortly before major roof work may create avoidable removal costs.
Which suits a new build or reroof?
Integration can be considered alongside the roofing programme. It may replace some conventional covering and provide a lower-profile appearance. Compare the total roof-and-solar cost, not just the panel price.
Does either design generate more?
Generation depends on panel capacity, layout, shade and operating conditions. Ventilation and temperature can differ between mounting arrangements. Ask for a forecast specific to the proposed design rather than assuming a fixed percentage difference.
What about wind and maintenance?
Both arrangements need a suitable structural and weather design. In-roof systems are not immune to wind uplift. Future access and panel replacement may affect roofing work, so clarify responsibilities and warranty terms.
How should you decide?
Balance appearance, existing roof condition, timing of building work, installed cost and expected annual generation. Read our integrated roof design guide for detailed questions to ask.
Solar panels use light to generate electricity; roof integration does not change that principle. Batteries and power-cut backup are separate design choices.
Solar design for your property
Renew-Able Solutions assesses roofs and electricity use across Edinburgh, East Lothian and wider Central and East Scotland. Explore our solar PV installation service or contact us for an assessment.
Reviewed 27 September 2026.
