Solar roof tiles are individual photovoltaic units that replace conventional roof tiles or slates 1-for-1, providing weatherproofing and electricity generation in a single integrated layer.
UK 2026 cost: £2,400-£3,200 per installed kWp (vs £1,150-£1,290/kWp for conventional in-roof solar panels). Worth the premium in Conservation Areas, Article 4 zones, listed-curtilage plots and premium custom builds.
What solar roof tiles are
A solar roof tile is a single photovoltaic unit, typically 600×300 mm to 600×400 mm, containing one or two PV cells producing 22-35W of electricity. The tile has the same form factor and weatherproofing characteristics as a conventional roof tile or slate — overlapping at the perimeter, interlocking electrically with neighbouring tiles in the same course, and laid in courses up the roof pitch like any heritage covering. The visual profile is identical to the surrounding non-PV roof at typical viewing distances.
By contrast, conventional solar panel arrays use ~1.7 m² modules of 425W each, mounted either on rails above the roof (on-roof) or flush-mounted in a tray below the tile line (in-roof). Both are clearly distinguishable from the surrounding roof, especially in oblique street-elevation views.
UK solar roof tile brands compared
| Product | Origin | £/kWp installed | Best for |
|---|---|---|---|
| Marley SolarTile | UK (Lichfield) | £2,400 | New-build estates with tile rooflines |
| GB-Sol PV Slate | Wales (Cwmbran) | £2,750 | Conservation Areas with slate roofs |
| Tesla Solar Roof | USA (UK delivery) | £3,200 | Premium custom builds, full-roof installations |
| Viridian Clearline Fusion | UK (Cambridge) | £1,950 | Panel-form roof-integrated alternative to tile |
All four products are MCS-certified and accepted by NHBC, LABC, Premier Guarantee and Buildmark structural warranties. All deliver FHS-compliant generation when sized to the 40% ground floor area rule.
When solar roof tiles make sense
Four scenarios where solar roof tiles are the right specification rather than conventional in-roof panels:
- 1Conservation Areas: Local Planning Authorities frequently condition conventional solar panels to rear-only roofs or refuse them outright. Solar roof tiles indistinguishable from the surrounding slate or tile are usually approved.
- 2Article 4 directions: Permitted development for solar PV is removed; both BIPV and panel installations require planning consent, but BIPV is much more likely to be approved.
- 3Listed-curtilage plots: New builds within the curtilage of a listed building need Listed Building Consent for external alterations. BIPV matching heritage materials is usually acceptable.
- 4Premium custom builds: On a £600k-£1m self-build, the £4,000-£8,000 BIPV premium over conventional in-roof is 0.4-1.3% of build cost — small enough that aesthetic preference often wins.
For the full BIPV vs conventional comparison see our BIPV vs in-roof page; for a Conservation Area worked example see the Cotswolds Conservation case study.
Solar roof tiles and FHS compliance
The Future Homes Standard Approved Document L 2026 does not distinguish between BIPV and panel installations for the 40% PV requirement. Solar roof tiles count by their PV-active area, which is typically 65-75% of the physical tile area depending on product. A 178-tile GB-Sol PV Slate installation provides ~5.2 kWp of FHS-counted generation — sufficient for a typical 4-bed detached at 65 m² ground floor area. For sizing detail see the 40% PV rule page.
Installation and warranty
Solar roof tile installation typically takes 3-5 days for a 5 kWp system, compared to 1-2 days for an equivalent in-roof panel array. The slower install reflects the per-tile electrical interconnection and weatherproofing detail. NHBC, LABC, Premier and Buildmark all accept BIPV installations without warranty reserve provided the product holds BBA or equivalent certification.
For a fixed-price BIPV quote, request a free consultation. For an indicative sizing based on your ground floor area, use the FHS PV calculator.