In-roof solar (sometimes called "integrated solar" or "BIPV-lite") sits flush with the roofline rather than on rails above it. The panels effectively replace tiles or slates over their footprint. There are four main products on the UK market in 2026; the best one depends on your roof material, planning constraints, budget, and aesthetic priorities.
We fit all four regularly across [Alderley Edge](/locations/alderley-edge/), [Prestbury](/locations/prestbury/), [Bowdon](/locations/bowdon/), [Hale Barns](/locations/hale-barns/), [Lymm](/locations/lymm/), and [Saddleworth](/locations/saddleworth/) — the conservation-area-heavy parts of our coverage where on-roof systems often aren't an option.
Why in-roof at all?
Three reasons drive customers to in-roof over on-roof:
1. Planning consent — Conservation Areas with Article 4 directions and most Listed Building Consents will only approve solar where it sits flush. In-roof is the pragmatic answer.
2. Aesthetics — even where on-roof is permitted, customers in the Cheshire Golden Triangle and Trafford wealth corridor often want the flush look. It looks more like a designed roof and less like a bolted-on retrofit.
3. Hail and wind resistance — in-roof systems sit lower so present less lift in high winds. Useful on exposed Pennine sites like [Saddleworth](/locations/saddleworth/) and rural Cheshire.
The trade-off is cost — in-roof adds £1,000–£2,000 to a typical 4 kWp install vs on-roof — and slightly lower yield (the panels run a few degrees hotter without the airflow under them). For most premium installs the trade is worth it; for cost-driven installs it isn't.
Viridian Clearline Fusion
What it is: UK-made integrated solar system. Frame replaces tile area, panels click into the frame.
Strengths: - The most-recognised heritage solar product in the UK — most conservation officers know it - Genuinely flush — sits about 5mm above adjacent tile surface - All-black aesthetic (panel + frame) for clean look - 25-year product warranty (frame), 30-year power warranty (panels) - Compatible with Welsh slate, clay tile, concrete tile
Weaknesses: - Premium pricing — typically £1,800–£2,200 more than on-roof for 4 kWp - Slightly slower install (full day vs half day for on-roof) - Limited panel choices — must use Viridian-approved modules
Best for: Conservation Area properties, Article 4 areas, listed buildings. Premium Cheshire/Trafford installs.
Typical price: 4 kWp Clearline Fusion fitted, £8,200. 8 kWp, £14,800. 12 kWp, £21,600.
GSE In-Roof
What it is: French-designed plastic-tray in-roof system. Trays replace tile area, panels slot into the trays with rubber gaskets.
Strengths: - Lower cost than Clearline Fusion — typically £600–£900 cheaper for equivalent kWp - Faster install — half-day to day faster than Clearline - Works with most panel brands (more module flexibility) - Strong track record across Europe (~1m installs)
Weaknesses: - The plastic tray edges are slightly visible vs Clearline's framed look - 20-year warranty on trays vs 25 on Clearline frame - Less well-known to UK conservation officers — sometimes need to educate on pre-app
Best for: Cost-conscious in-roof installs where aesthetic is important but Article 4 doesn't force premium spec.
Typical price: 4 kWp GSE In-Roof fitted, £7,400. 8 kWp, £13,200.
Plug-In Solar In-Roof
What it is: UK-made integrated frame system, similar concept to Clearline but with a slightly different mounting frame and module fixing.
Strengths: - Strongest on Pennine stone slate roofs (Saddleworth, Ramsbottom, parts of Cheshire) — the frame depth accommodates thicker stone slates better than Clearline - Genuinely UK-manufactured - Compatible with a wider range of panels - 20-year warranty on frame
Weaknesses: - Less brand recognition than Clearline - Aesthetic is good but Clearline still slightly cleaner side-by-side
Best for: Stone slate roofs in Pennine areas, Saddleworth, Ramsbottom, rural Cheshire.
Typical price: 4 kWp Plug-In Solar In-Roof fitted, £7,800. 8 kWp, £14,000.
Tesla Solar Roof
What it is: Whole-roof replacement with Tesla-manufactured solar tiles (active) and matching non-solar tiles (passive). Integrated with Tesla Powerwall 3 + Tesla Wall Connector via the Tesla app.
Strengths: - The ultimate aesthetic — looks like a designed slate roof, not a solar installation - Higher active-tile output than any other in-roof product - Full Tesla ecosystem integration (Powerwall 3, Wall Connector, app) - Re-roof + solar in one project — saves separate re-roof cost on properties needing roof work anyway - 25-year tile warranty (industry-leading)
Weaknesses: - Cost — £35,000–£60,000 for typical homes vs £8k–£21k for traditional in-roof options - Only viable on full re-roof — not retrofittable to existing roof - Tesla-only ecosystem (battery, app, charger)
Best for: New build, full re-roof projects, ultra-premium [Prestbury](/locations/prestbury/) / [Alderley Edge](/locations/alderley-edge/) installs where aesthetic trumps cost.
Typical price: Whole-house Solar Roof, £35k–£60k. Includes Powerwall 3 in most quotes.
Side-by-side: 8 kWp on a Cheshire detached home
For a typical 8 kWp install on a detached Cheshire property:
| Product | Fitted price | Premium vs on-roof | Install time | Planning recognition | |---|---|---|---|---| | Standard on-roof | £11,500 | — | 1 day | Need consent in Article 4 | | GSE In-Roof | £13,200 | +£1,700 | 1.5 days | Moderate | | Plug-In Solar In-Roof | £14,000 | +£2,500 | 2 days | Moderate | | Viridian Clearline Fusion | £14,800 | +£3,300 | 2 days | Excellent | | Tesla Solar Roof (incl re-roof) | £45,000 | +£33,500 | 5–7 days | Strong (new product) |
Add Tesla Powerwall 3 to any of the first four: +£8,400.
Our recommendation matrix
We typically recommend:
- Heritage rear-elevation install with planning consent: Viridian Clearline Fusion. The product conservation officers want to see.
- Article 4 area, looking for value: GSE In-Roof. 90% of the aesthetic at 80% of the cost.
- Pennine stone slate property: Plug-In Solar In-Roof. The frame design suits stone slates best.
- Full re-roof project + Tesla ecosystem: Solar Roof. Worth the premium when you're re-roofing anyway.
- Standard non-conservation property: On-roof rail-mounted. Save the £2k unless aesthetics are critical.
What we install most
Across our 11,000+ installs, the split is approximately: - On-roof: 78% (most properties; cost-driven and PD-eligible) - GSE In-Roof: 9% - Viridian Clearline Fusion: 8% - Plug-In Solar In-Roof: 4% - Tesla Solar Roof: 1% (growing — three projects in 2026 so far)
In the [Cheshire Golden Triangle](/blog/solar-panels-cheshire-golden-triangle-2026/) and Trafford wealth corridor specifically, the in-roof split inverts — we install in-roof on ~60% of premium jobs in [Alderley Edge](/locations/alderley-edge/), [Prestbury](/locations/prestbury/), and [Bowdon](/locations/bowdon/).
Get an in-roof solar quote: [book a survey](/contact/) — we'll quote on-roof and in-roof side by side so you can compare.