Integrated solar panels (also called in-roof panels) sit flush with your roof tiles rather than mounted on top of them, replacing a section of the roof covering in the area the array occupies. They cost more than standard on-roof panels for the same output, but noticeably less than full solar shingle roofs, and they’re the middle option for anyone who wants a neater look without going all the way to a tile-replacement system.
What Are Integrated Solar Panels?
An in-roof, or integrated, system uses standard photovoltaic panels – the same underlying technology as a normal on-roof array – but fits them into a frame that sits level with the surrounding tiles, rather than raised on mounting rails above them. The roof tiles are removed in the area the panels will occupy and replaced with a weatherproof flashing kit that the panels sit into, so from a distance the array reads as a smooth, dark section of roof rather than a raised block of panels.
Integrated (In-Roof) vs On-Roof Solar Panels Compared
| Factor | Integrated (in-roof) | Standard on-roof |
|---|---|---|
| How they’re fitted | Flush, replacing tiles in that area | Mounted on rails above the existing tiles |
| Underlying panel technology | Same standard PV cells as on-roof panels | Same standard PV cells |
| Typical cost | Higher than on-roof, lower than full solar shingles | Lowest of the three options |
| Visual impact | Low – sits level with the roof | More visible, raised profile |
| Airflow underneath | Less, which can slightly increase operating temperature | Better airflow, helps keep panels cooler |
| Retrofit complexity | Involves removing tiles in that section | Simpler – no tile removal needed |
How Installation Differs From a Standard Array
Fitting an integrated system means removing tiles across the exact area the panels will cover, fitting a flashing kit designed for that specific panel size, then setting the panels into it so they sit level with the surrounding roof. It takes longer than a standard on-roof fit because of the extra tile removal and flashing work, and it’s a job best left to installers with specific in-roof experience rather than any general MCS installer, since getting the flashing wrong risks leaks that a raised on-roof system doesn’t have to worry about in the same way.
Cost Differences Between Integrated and On-Roof Panels
Expect an integrated system to cost noticeably more than an equivalent on-roof array, mainly down to the extra labour of removing tiles and fitting a proper flashing kit, plus a smaller pool of installers experienced enough to quote it confidently. It’s still generally cheaper than a full solar shingle roof, where every tile itself is a photovoltaic cell rather than just the panels being recessed – see our guide to solar shingles vs solar panels for how that compares.
Pros and Cons of Integrated Solar Panels
The main advantage is appearance: a flush, level array reads as far less obtrusive than raised panels, which matters if kerb appeal or a strict conservation area aesthetic is a priority. The trade-offs are real, though – higher cost, less airflow underneath the panels (which can very slightly reduce output on hot days, since panels perform best when cooler), a smaller pool of experienced installers, and more complexity if a panel ever needs replacing, since the surrounding flashing has to be disturbed to get it out.
Are Integrated Solar Panels the Same as Solar Tiles?
No, and this is a common mix-up. Integrated panels are standard rectangular PV panels fitted flush with the roof; solar tiles (or shingles) are individual roofing tiles that are each a photovoltaic cell in their own right, replacing the entire roof covering rather than just recessing a panel array into it. Integrated panels sit between standard on-roof and full solar tiles on both cost and how much they blend into the roof.
Is an Integrated System Right for You?
Integrated panels make the most sense if appearance matters enough to justify the extra cost, but a full solar shingle roof is more than you need or want to spend, particularly if you’re not already replacing the whole roof. If cost and maximum output per pound are your priority, a standard on-roof system remains the more straightforward choice for most UK homes – our solar panel costs guide breaks down what a standard installation typically costs for comparison.
Frequently Asked Questions About Integrated Solar Panels
Are integrated solar panels less efficient than on-roof panels?
The panels themselves use the same technology and efficiency rating as on-roof panels. The main difference is reduced airflow underneath, which can very slightly increase operating temperature and marginally reduce output on hot days, though this is a small effect rather than a major efficiency gap.
Can integrated solar panels be fitted to an existing roof?
Yes, though it involves more work than a standard on-roof retrofit since tiles need removing and a flashing kit fitting in the array’s exact location. It’s a realistic retrofit option, just a more involved and costly one than fitting panels on top of your existing tiles.
Do integrated solar panels cost more to maintain?
Routine cleaning is much the same as any panel, but repairs can be more involved if a panel needs replacing, since the surrounding flashing has to be carefully removed and refitted to keep the roof weathertight. This is worth factoring into your decision alongside the upfront cost difference.
Why would I choose integrated panels over a full solar tile roof?
Mainly cost and installer availability. Integrated panels use widely available standard PV technology and cost less than a full solar shingle roof, while still giving a much flatter, less visible result than raised on-roof panels – a practical middle ground for most homeowners who want a neater look without the price and limited installer choice of full solar tiles.
