In-Roof Solar Panels — Integrated Solar PV Systems
In-roof solar panels replace your roof tiles and sit flush with the roof surface — producing clean energy and acting as your weatherproofing layer simultaneously. They cost similar to traditional on-roof panels when installed during a roof replacement or new build, produce about 3% less energy due to reduced airflow, and are the best-looking solar option available for UK homes.
Key Takeaways
- In-roof (integrated) solar panels replace roof tiles and sit flush with the roof surface — no raised rails or visible mounting hardware.
- Cost: £5,000–£8,100 for a 4kW system when combined with a roof replacement or new build — similar to on-roof panels because the tiles they replace offset the integrated mounting cost.
- Output is approximately 3% lower than equivalent on-roof panels due to reduced airflow and higher panel operating temperature.
- Best suited to new builds, self-builds, and roof replacements. Not recommended as a retrofit on a sound roof (stripping adds cost without benefit).
- Planning permission is rarely required — integrated panels sit flush so they automatically satisfy the 200mm permitted development rule. Exception: listed buildings and conservation areas.
- All in-roof systems qualify for the Smart Export Guarantee when installed by an MCS-certified installer.
- Battery storage is fully compatible — pairing with a 9.5kWh GivEnergy battery raises self-consumption from ~40% to 70–80%.
What Is the Difference Between In-Roof and On-Roof Solar Panels?
Standard solar panels in the UK are installed as on-roof (overlay) systems: aluminium rails are anchored to the rafters, and panels are clipped to the rails, sitting 5–15cm above the existing roof tiles. This creates a natural air gap that keeps panels cool and maximises output.
In-roof (integrated) systems work differently: the tiles are stripped in the solar array zone and replaced by a waterproof tray system. The solar panels clip into this tray and sit flush with the remaining roof surface — no raised edges, no visible mounting hardware, no gap between panel and roof.
The result looks like the panels grew from the roof. For aesthetics-conscious homeowners, architect-designed self-builds, and conservation-adjacent properties (where a lower-profile system is preferred), in-roof solar is the industry's cleanest solution.
✓ Advantages of In-Roof Solar
- Flush, seamless aesthetic — no visible rails
- Dual function: energy generation + weatherproofing
- Better suited where planning requires low-profile
- No gaps under panels — reduced wind lift risk
- Cost-neutral when fitted during roof replacement
✗ Disadvantages of In-Roof Solar
- ~3% lower energy output than on-roof
- Panels run hotter — faster degradation long-term
- Requires tile strip if retrofitting — added cost
- Fewer panel brand choices within integrated systems
- More complex to service or replace individual panels
How Much Do In-Roof Solar Panels Cost in the UK?
The cost of in-roof solar panels has converged significantly with on-roof over the past three years. When installed during a new build or roof replacement, the integrated mounting system replaces tiles that would otherwise need to be purchased — keeping overall costs competitive.
| System Size | Panels | In-Roof Cost | On-Roof Cost | Annual Output |
|---|---|---|---|---|
| 3 kW | 7–8 | £4,500–£6,000 | £4,500–£5,500 | 2,500–2,900 kWh |
| 4 kW | 10–11 | £5,500–£7,500 | £5,000–£7,000 | 3,300–3,880 kWh |
| 6 kW | 14–16 | £7,500–£10,000 | £7,000–£9,500 | 5,000–5,800 kWh |
| Retrofit strip cost | — | + £500–£1,500 | Not required | — |
All prices above include 0% VAT (standard for solar panels in England). Solar panel cost guidance across all system types is available on our full cost guide.
When Should You Choose In-Roof Instead of On-Roof Solar?
In-roof solar panels make the most sense in four situations:
New builds and self-builds: Integrating solar at build stage avoids scaffolding costs, eliminates a second contractor visit, and lets you plan cable routes from the start. Standard solar panel installation is almost always the right choice for completed properties — but for new builds, in-roof is the premium option worth considering.
Roof replacement: If your roof needs new tiles anyway, the marginal cost of in-roof solar versus on-roof is small — and you get a much cleaner finish. Greentech Renewables can coordinate with your roofing contractor or handle the full project.
Conservation-adjacent properties: Where full planning permission is required (e.g., listed buildings or conservation areas), a flush in-roof installation can sometimes achieve planning approval where raised on-roof panels cannot, because the visual impact is lower.
Premium aesthetics: Some homeowners simply want the cleanest possible finish. If that is your priority and the additional cost or marginal output reduction is acceptable, in-roof delivers the best-looking solar installation available.
Do In-Roof Solar Panels Require Planning Permission?
Under the Town and Country Planning (General Permitted Development) Order 2015, solar panels on residential rooftops are permitted development — no planning application required — provided they do not protrude more than 200mm from the roof surface. In-roof integrated panels sit flush with the roof and automatically satisfy this condition.
Exceptions where planning permission is always required: listed buildings and properties within designated conservation areas. Greentech Renewables carries out a planning check as part of the free site survey for any Greater Manchester property.
Get a Free In-Roof Solar Panel Quote
We design bespoke in-roof solar systems for new builds, self-builds, and roof replacements across Greater Manchester. Fixed price, 0% VAT, MCS certified.
Book Free Survey Instant EstimateFrequently Asked Questions — In-Roof Solar Panels
What is the difference between in-roof and on-roof solar panels?
Are in-roof solar panels less efficient than on-roof?
Do in-roof solar panels cost more than on-roof panels?
Do in-roof solar panels need planning permission?
Are in-roof solar panels suitable for all roof types?
What are the best in-roof solar panel systems in the UK?
Do in-roof solar panels qualify for the Smart Export Guarantee?
Can I add battery storage to an in-roof solar system?
Methodology note: Output comparison (in-roof vs on-roof) based on Viridian Solar field research 2024 and MCS yield calculations for Greater Manchester (1,340 sunshine hours/year). Cost ranges sourced from Greentech Renewables installation data 2025–2026 and The Eco Experts UK solar cost tracker. Planning rules from TCPA (General Permitted Development) Order 2015.
MCS-certified solar panel installers specialising in both on-roof and in-roof integrated systems across Greater Manchester. We serve Stockport, Bolton, Rochdale, and the wider North West. Rated 4.9★ on Trustpilot. Read reviews →
