Building Integrated Photovoltaics (BIPV) are solar products that replace conventional building materials while generating electricity. Unlike traditional solar panels that mount on top of existing roofs, BIPV products become the roof, façade, or window themselves. Solar roof tiles replace conventional tiles, solar glazing replaces standard glass, and solar cladding replaces traditional façade materials – each serving a dual function as both building envelope and power generator.
The appeal of BIPV is primarily aesthetic. For heritage properties, conservation areas, or homeowners who simply prefer a cleaner look, BIPV offers solar generation without the visible panels. However, this comes at a cost – BIPV typically costs 2-4 times more than conventional panels per watt installed, generates 10-30% less electricity due to design compromises, and has fewer installer options. For most UK homes, traditional panels remain the practical choice.
This guide explains the different types of BIPV, their costs and performance, planning advantages, installation considerations, and helps you decide whether BIPV makes sense for your property.
Quick Overview
| What BIPV is | Solar products that replace building materials |
| Main types | Solar tiles, solar glazing, solar cladding |
| Primary benefit | Aesthetics – no visible panels |
| Cost vs panels | 2-4× more expensive per watt |
| Efficiency vs panels | 10-30% less output typically |
| Best suited for | Heritage; conservation areas; new builds |
What Makes BIPV Different
BIPV vs BAPV
| Type | Description |
|---|---|
| BIPV (Building Integrated) | Replaces building material |
| BAPV (Building Applied) | Mounts on existing structure |
| Traditional panels | BAPV – added to roof |
| Solar tiles | BIPV – become the roof |
The international BIPV definition – “if removed, the PV module would have to be replaced by an appropriate building component” – comes from the IEA-PVPS Task 15 work on Enabling Framework for the Development of BIPV, which is the standard reference for BIPV definitions, classifications and barriers to adoption.
Dual Function
| Function | Requirement |
|---|---|
| Building envelope | Weatherproofing; insulation; structure |
| Power generation | Convert sunlight to electricity |
| Both required | Must perform as building material first |
| Design compromise | Often means lower solar efficiency |
Material Replacement
| BIPV Type | Replaces |
|---|---|
| Solar tiles/slates | Roof tiles or slates |
| Solar glazing | Windows; skylights; atria |
| Solar cladding | Façade panels; rainscreen |
| Solar canopy | Carport; shade structure |
Types of BIPV
Solar Roof Tiles/Slates
| Aspect | Details |
|---|---|
| Appearance | Resemble conventional tiles or slates |
| Installation | Replace all or part of roof covering |
| Sizes | Individual tile size or larger modules |
| Brands | Tesla Solar Roof; Marley SolarTile; GB Sol |
In-Roof Solar Systems
| Aspect | Details |
|---|---|
| Design | Standard panels integrated into roof plane |
| Flashing | Special trim creates weathertight seal |
| Appearance | Flush with roof; no visible gap |
| Brands | GSE; Viridian; various in-roof systems |
Solar Glazing
| Type | Application |
|---|---|
| Semi-transparent | Windows; skylights; atria |
| Spandrel panels | Opaque sections between windows |
| Curtain wall | Full glass façade integration |
| Canopy | Entrance covers; walkways |
For the wider class of see-through PV technology – including the cell-level approaches that make solar glazing possible – see our guide to transparent solar panels.
Solar Cladding/Façade
| Type | Details |
|---|---|
| Rainscreen panels | Ventilated façade system |
| Composite panels | Solar cells in cladding material |
| Coloured BIPV | Custom colours for aesthetics |
| Orientation | Vertical or angled façade |
Solar Roof Tiles in Detail
How Solar Tiles Work
| Component | Function |
|---|---|
| Solar cells | Generate electricity |
| Tempered glass | Protection; weather seal |
| Tile body | Structural; interlocking |
| Electrical connections | Link tiles together |
Tile Types
| Style | Description |
|---|---|
| Flat tile | Modern; slate-like appearance |
| Profiled tile | Traditional clay tile look |
| Slate-style | Mimics natural slate |
| Shingle | US style; less common in UK |
Active vs Dummy Tiles
| Type | Purpose |
|---|---|
| Active tiles | Contain solar cells; generate power |
| Dummy tiles | Match appearance; no generation |
| Why both | Cover shaded areas; edges; north side |
| Cost saving | Dummy tiles cheaper than active |
Popular Solar Tile Products
| Product | Key Features |
|---|---|
| Tesla Solar Roof | Premium; full roof replacement; limited UK |
| Marley SolarTile | UK manufacturer; integrates with Marley tiles |
| GB Sol | Welsh manufacturer; various styles |
| Nulok Solar | Interlocking system; steel construction |
| Solarcentury C21e | In-roof system; slate appearance |
Solar Glazing in Detail
Types of Solar Glazing
| Type | Characteristics |
|---|---|
| Crystalline cell | Visible cells; spaced for transparency |
| Thin-film | Uniform appearance; semi-transparent |
| Dye-sensitised | Coloured; decorative options |
| Perovskite | Emerging; tuneable transparency |
For the technology behind tuneable-transparency BIPV glass, see our guides to perovskite solar panels and quantum-dot solar cells – both are research-stage technologies with strong BIPV potential.
Transparency Levels
| Transparency | Light Transmission | Power Output |
|---|---|---|
| Opaque | 0-10% | Highest |
| Low transparency | 10-30% | Good |
| Medium transparency | 30-50% | Moderate |
| High transparency | 50-70% | Low |
Applications
| Application | Typical Type |
|---|---|
| Skylights | Medium transparency |
| Atria | Low to medium transparency |
| Spandrel panels | Opaque (between windows) |
| Curtain wall | Mix of types |
| Conservatory | Low transparency |
Performance Trade-off
| Factor | More Transparency | Less Transparency |
|---|---|---|
| Daylight | More natural light | Less natural light |
| Power output | Lower generation | Higher generation |
| Heat gain | More solar heat | Less solar heat |
| Views | Better views | Obscured views |
Solar Cladding and Façades
Façade BIPV Types
| Type | Description |
|---|---|
| Ventilated rainscreen | Panels with air gap behind |
| Curtain wall | Non-structural glass/panel façade |
| Double-skin façade | Outer BIPV layer; inner wall |
| Louvres/brise soleil | Shading devices with PV |
Vertical vs Tilted
| Orientation | Output vs South Roof |
|---|---|
| Vertical south | ~60-70% |
| Vertical east/west | ~50-60% |
| Tilted façade | Better than vertical |
| North façade | ~25-35% |
Advantages of Façade BIPV
| Advantage | Explanation |
|---|---|
| Different peak times | Morning/afternoon vs midday |
| Self-shading benefit | Reduces cooling load |
| Vertical = no snow | Snow slides off |
| Large surface area | Tall buildings have lots of wall |
Coloured BIPV
| Aspect | Details |
|---|---|
| Technology | Coloured filters; special coatings |
| Colours available | Various – terracotta; grey; green; etc. |
| Efficiency impact | 10-30% lower than black |
| Application | Match existing building materials |
Costs and Economics
Cost Comparison
| System Type | Cost per kWp (Installed) |
|---|---|
| Traditional roof-mount panels | £1,500-2,000 |
| In-roof panel system | £2,000-3,000 |
| Solar tiles (active + dummy) | £4,000-8,000 |
| Tesla Solar Roof | £6,000-10,000 |
| Solar glazing | £3,000-6,000 |
Why BIPV Costs More
| Factor | Explanation |
|---|---|
| Dual function | Must work as building material too |
| Custom design | Often bespoke for building |
| Lower volume | Less mass production |
| Complex installation | Roofing + electrical skills |
| Certification | Building material + electrical standards |
Total Cost Consideration
| Scenario | Cost Analysis |
|---|---|
| New build | BIPV replaces roofing cost anyway |
| Re-roof needed | Solar tiles vs tiles + panels |
| Existing good roof | BIPV much more expensive |
| Net cost | Deduct material being replaced |
Example: Re-Roofing Scenario
| Option | Cost |
|---|---|
| New slate roof | £15,000 |
| Plus traditional 4kW solar | £7,000 |
| Total conventional | £22,000 |
| Solar slate roof 4kW | £28,000-35,000 |
| Premium for BIPV | £6,000-13,000 |
Efficiency and Performance
Efficiency Comparison
| Product Type | Typical Efficiency |
|---|---|
| Standard panels (2026) | 20-23% |
| Solar tiles | 15-20% |
| In-roof systems | 18-22% |
| Semi-transparent glazing | 5-12% |
| Coloured BIPV | 12-18% |
Why BIPV Has Lower Efficiency
| Factor | Impact |
|---|---|
| Smaller cells | Fit tile format |
| More connections | Losses at each junction |
| Heat build-up | Less ventilation than rack-mount |
| Transparency | Less light absorbed |
| Aesthetic compromises | Non-optimal cell placement |
Output Comparison
| System | Annual Output (4kWp, South UK) |
|---|---|
| Traditional panels | ~3,800-4,200 kWh |
| In-roof system | ~3,500-4,000 kWh |
| Solar tiles | ~3,200-3,800 kWh |
| Reduction | 5-20% less than panels |
In-Roof Temperature Penalty
| Factor | Effect |
|---|---|
| No air gap | Heat can’t dissipate |
| Higher cell temperature | 5-15°C hotter than rack-mount |
| Output reduction | 2-5% less due to heat |
| Mitigation | Some systems have ventilation |
For more on how heat affects panel output – and why ventilation behind panels is so important – see our guide to can solar panels get too hot.
Planning and Regulations
Permitted Development for BIPV
| Aspect | BIPV Advantage |
|---|---|
| Protrusion limit | BIPV often doesn’t protrude |
| Flush installation | May meet more conditions |
| Conservation areas | May be more acceptable |
| Still check | Rules vary; confirm with LPA |
Conservation Areas
| Factor | BIPV Consideration |
|---|---|
| Traditional appearance | Solar tiles match existing |
| Less visual impact | No “bolt-on” appearance |
| Planning support | Often preferred over panels |
| Still need approval | Application usually required |
Listed Buildings
| Requirement | Details |
|---|---|
| Listed building consent | Required for any changes |
| BIPV may help | Less visual alteration |
| Case by case | Each application assessed |
| Heritage officer | Early consultation advised |
Building Regulations
| Regulation | BIPV Requirement |
|---|---|
| Part L (Energy) | Contributes to energy performance |
| Part B (Fire) | Must meet fire safety standards |
| Part P (Electrical) | Competent person installation |
| Structural | Load calculations required |
For the electrical-safety side specifically, see our Part P building regulations guide.
Installation Considerations
Installer Requirements
| Skills Needed | Reason |
|---|---|
| Roofing expertise | BIPV is the roof covering |
| Electrical qualification | Solar system installation |
| Product training | Manufacturer certification |
| Warranty requirement | Often needs approved installer |
Finding BIPV Installers
| Source | Notes |
|---|---|
| Manufacturer list | Product-specific trained installers |
| MCS database | Filter by BIPV capability |
| Specialist companies | Focus on integrated systems |
| Fewer options | Less common than panel installers |
Installation Complexity
| Factor | BIPV vs Panels |
|---|---|
| Installation time | Longer – more connections |
| Weatherproofing | Critical – is the roof |
| Coordination | Roofing and electrical together |
| Quality control | Higher stakes if wrong |
Maintenance Access
| Issue | Consideration |
|---|---|
| Individual tile failure | May need multiple tiles removed |
| Replacement parts | Must be available for 25+ years |
| Roof repairs | More complex with integrated solar |
| Warranty | Check manufacturer longevity |
Warranties and Longevity
Typical Warranties
| Component | Typical Warranty |
|---|---|
| Solar tiles product | 20-30 years |
| Performance warranty | 25-30 years |
| Weatherproofing | 10-25 years |
| Compare: Standard panels | 25-30 years product |
Long-Term Considerations
| Factor | Consideration |
|---|---|
| Manufacturer stability | Will they exist in 20 years? |
| Replacement availability | Can you get matching parts? |
| Technology evolution | Future tiles may not match |
| Roof lifespan | Should match or exceed tiles |
Established vs New Products
| Product Age | Consideration |
|---|---|
| Established (10+ years) | Track record; known issues |
| Newer products | May have unknown issues |
| Very new | Limited real-world data |
| Risk assessment | Balance innovation vs proven |
When BIPV Makes Sense
Good Candidates for BIPV
| Scenario | Why BIPV Works |
|---|---|
| New build | Design from start; roof cost anyway |
| Re-roofing needed | Replacing tiles regardless |
| Conservation area | Planning may require it |
| Listed building | May be only acceptable option |
| Aesthetic priority | Appearance matters most |
Less Suitable for BIPV
| Scenario | Why Panels Better |
|---|---|
| Existing good roof | No need to replace covering |
| Budget constrained | Panels much cheaper per watt |
| Maximum output priority | Panels more efficient |
| DIY consideration | Panel systems more accessible |
Decision Framework
| Question | If Yes |
|---|---|
| Is re-roofing needed anyway? | Consider BIPV |
| Is planning restrictive? | BIPV may be required |
| Is appearance critical? | BIPV worth premium |
| Is budget unlimited? | BIPV is fine |
| If no to all | Traditional panels likely better |
UK BIPV Market
Available Products
| Product | Availability |
|---|---|
| Marley SolarTile | Good – UK manufacturer |
| GB Sol | Good – Welsh manufacturer |
| Tesla Solar Roof | Limited – few UK installers |
| In-roof systems (GSE etc.) | Good – widely available |
| Solar glazing | Specialist – commercial mainly |
Market Trends
| Trend | Observation |
|---|---|
| Growing interest | Aesthetics increasingly valued |
| New build uptake | Developers offering BIPV |
| Price reduction | Gradual – still premium |
| More options | Product range expanding |
Government Support
| Incentive | BIPV Eligibility |
|---|---|
| Smart Export Guarantee | Yes – same as panels |
| 0% VAT | Yes – same as panels |
| Planning relaxation | May benefit from changes |
| Building regs credits | Yes – counts for Part L |
For more on the SEG side, see our SEG calculator – BIPV exports are valued at the same SEG tariffs as conventional panel exports.
Frequently Asked Questions
Basic Questions
| Question | Answer |
|---|---|
| Are solar tiles worth it? | If aesthetics or planning require it |
| How much more do they cost? | 2-4× more than panels per watt |
| Do they work as well? | 10-30% less output typically |
| Can I get them in the UK? | Yes – several options available |
Technical Questions
| Question | Answer |
|---|---|
| Are they waterproof? | Yes – they are the roof |
| How long do they last? | 25-30 years warranted |
| Can I mix with normal tiles? | Yes – matching dummy tiles available |
| What if one breaks? | Individual replacement possible |
Summary
| Aspect | Key Point |
|---|---|
| What BIPV is | Solar products replacing building materials |
| Main types | Solar tiles; solar glazing; solar cladding |
| Primary benefit | Aesthetics – blends with building |
| Cost premium | 2-4× more than traditional panels |
| Efficiency | 10-30% less output than panels |
| Best for | New builds; re-roofs; heritage; planning |
| Installation | Specialist installers required |
| Verdict | Worth it when appearance matters most |
Building Integrated Photovoltaics offer a way to generate solar electricity without the “bolt-on” appearance of traditional panels. Solar tiles, solar glazing, and solar cladding can all look like conventional building materials while producing power. For properties where aesthetics are paramount – heritage buildings, conservation areas, or simply homeowners who prefer a seamless look – BIPV provides a solution that traditional panels cannot.
However, this aesthetic benefit comes at a substantial cost. BIPV typically costs 2-4 times more per watt than conventional panels, generates 10-30% less electricity due to design compromises, and requires specialist installers who are less common than regular solar installers. For most UK homes with good existing roofs, traditional panels remain the practical and economical choice.
The calculation changes when a roof needs replacing anyway. If you’re re-roofing, the cost comparison becomes solar tiles versus (new tiles plus panels) – narrowing the premium significantly. New builds can incorporate BIPV from the design stage, offsetting the roofing cost entirely. In these scenarios, BIPV becomes more competitive.
Planning requirements may also make BIPV the only viable option. Conservation areas often resist traditional panels, and listed buildings may only get approval for solutions that minimise visual impact. In these cases, the “premium” for BIPV is really the cost of being able to have solar at all.
BIPV decision shortcut. Ask three questions in order. (1) Is the existing roof in good condition with at least 15 years of life left? If yes, BIPV is hard to justify economically – choose conventional panels. (2) Are planners restricting visible solar (conservation area, listed building, or strict design code)? If yes, BIPV may be the only consented option, so the “premium” is really the cost of having any solar at all. (3) Is appearance the top priority and budget secondary? If yes, BIPV’s aesthetic benefit is real and worth paying for.
If you’re considering BIPV, get quotes from at least two manufacturer-trained installers – the UK pool is small and prices vary widely. Ask specifically about replacement tile availability, warranty transfer on resale, and whether the system uses a standard inverter (good – swappable later) or proprietary electronics (less ideal long-term).
