In roof solar panels

Find out the costs, pros and cons, and extra information about in roof or integrated solar panels.

What Are In-Roof Solar Panels?

In-roof solar panels, also known as integrated solar or building-integrated photovoltaics (BIPV), replace traditional roof tiles rather than sitting on top of them. They create a sleek, flush finish that many homeowners find more aesthetically pleasing than conventional on-roof systems.

How They Differ

Traditional panels:

• Mount on rails above existing tiles
• Create a raised profile
• Easier to install and maintain
• Better ventilation

In-roof panels:

• Replace roof covering
• Sit flush with roofline
• Weatherproof the roof
• Seamless appearance

Types of In-Roof Solar Systems

Solar Tiles

Individual tiles with integrated PV:
• Size: Similar to regular tiles
• Coverage: Entire roof possible
• Efficiency: Generally lower
• Cost: Premium option

Integrated Panel Systems

Larger panels replacing tile sections:
• GSE Integration: Market leader
• Viridian Solar: Popular UK option
• SolarCentury C21e: High efficiency
• Solarwatt: Glass-glass design

Hybrid Systems

Combining tiles and panels:
• Active and dummy tiles
• Cost-effective coverage
• Maintains uniform appearance
• Flexible design options

Costs of In-Roof Solar

Price Comparison

Typical UK installation costs:

#### Standard On-Roof System

• 4kW system: £5,000-£7,000
• Installation: 1-2 days
• No roofing work needed

#### In-Roof Integrated System

• 4kW system: £7,000-£10,000
• Installation: 2-4 days
• Includes roofing work

#### Premium Solar Tiles

• 4kW equivalent: £10,000-£15,000
• Installation: 3-5 days
• Complete roof integration

Cost Factors

Additional expenses include:
• Roofing labor
• Flashing kits
• Waterproofing materials
• Planning requirements
• Longer installation time

Advantages of In-Roof Solar

Aesthetic Benefits

• Sleek appearance: Flush with roofline
• Uniform look: No raised profile
• Property value: Enhanced curb appeal
• Planning friendly: Conservation areas
• Modern finish: Contemporary homes

Practical Advantages

• Weatherproofing: Replaces tiles
• New builds: Cost-effective
• Re-roofing: Two jobs in one
• Longevity: Protected components
• Security: Harder to remove

When Most Beneficial

Ideal situations:
• New build properties
• Major roof renovations
• Listed buildings (sometimes)
• Premium developments
• Design-conscious owners

Disadvantages of In-Roof Solar

Technical Drawbacks

• Reduced efficiency: Less cooling airflow
• Higher temperatures: 5-10°C hotter
• Power loss: Up to 5% reduction
• Maintenance access: More difficult
• Expansion limited: Fixed installation

Financial Considerations

• Higher upfront cost: 30-50% more
• Specialist installers: Limited availability
• Longer payback: Due to costs
• Insurance: May affect premiums
• Repairs: More complex

Installation Challenges

• Weather dependent
• Requires roofing skills
• Longer disruption
• Warranty complexities
• Limited retrofitting

Installation Process

New Build Installation

• Roof structure prepared
• Battens installed to level
• Mounting frames positioned
• Panels integrated with tiles
• Flashing ensures weatherproofing
• Electrical connections completed

Retrofit Installation

• Existing tiles removed
• Roof structure assessed
• Modifications if needed
• Integration system installed
• Weatherproofing critical
• Surrounding tiles adjusted

Performance Considerations

Heat Management

In-roof panels run hotter:
• Standard panels: 25°C above ambient
• In-roof panels: 30-35°C above ambient
• Performance impact: -0.4% per °C
• Annual loss: 3-5% typically

Mitigation Strategies

• Choose heat-tolerant panels
• Ensure roof ventilation
• Consider hybrid systems
• Use optimizers
• Monitor performance

Planning Permission

Generally Permitted

In-roof usually allowed under PD if:
• Not exceeding roofline
• Minimal visual impact
• Not in conservation area
• Building not listed

When Permission Needed

• Listed buildings
• Conservation areas
• National parks
• Significant visual change
• Local restrictions

Best In-Roof Products

GSE Integration System

• Market leader
• Universal compatibility
• Proven weatherproofing
• 10-year warranty
• Wide installer network

Viridian Clearline Fusion

• UK-designed
• Easy installation
• Cost-effective
• Good aesthetics
• Strong support

SolarCentury C21e

• Premium option
• High efficiency
• Excellent build
• Long warranties
• Professional grade

Maintenance and Repairs

Routine Maintenance

Similar to standard panels:
• Annual inspection
• Performance monitoring
• Occasional cleaning
• Electrical testing

Repair Considerations

More complex than on-roof:
• Panel replacement harder
• Roof access required
• Weather dependent
• Specialist needed
• Higher costs

Suitability Assessment

Ideal Candidates

In-roof works best for:
• New build homes
• Roof replacement projects
• Design-focused buyers
• Conservation properties
• Premium developments

Less Suitable For

Consider alternatives if:
• Existing good roof
• Budget constraints
• DIY maintenance planned
• Maximum efficiency needed
• Future expansion likely

Real-World Examples

New Build Success

Modern development features:
• Integrated from design
• Cost absorbed in build
• Uniform appearance
• High property values
• Buyer satisfaction

Retrofit Challenges

Older property issues:
• Complex integration
• Higher costs
• Extended timeline
• Mixed results
• Some efficiency loss

Future Developments

Technology Advances

Coming improvements:
• Better heat management
• Improved efficiency
• Easier installation
• Modular systems
• Smart integration

Market Trends

• Growing popularity
• Reducing costs
• More options
• Better training
• Standardization

Making the Decision

Choose In-Roof If:

• ✅ Building/renovating
• ✅ Aesthetics priority
• ✅ Long-term ownership
• ✅ Premium budget
• ✅ Planning restrictions

Choose On-Roof If:

• ✅ Existing roof good
• ✅ Budget conscious
• ✅ Maximum efficiency
• ✅ Quick installation
• ✅ Future flexibility

Professional Advice

Specialist Installers

Essential requirements:
• Roofing experience
• Electrical qualifications
• Product training
• Insurance coverage
• Warranty backing

Key Questions

Ask installers:
• Previous installations?
• Weatherproofing guarantee?
• Performance projections?
• Maintenance requirements?
• Total project timeline?

Conclusion

In-roof solar panels offer an aesthetically superior solution for those prioritizing appearance and building integration. While they cost more and may perform slightly less efficiently than traditional on-roof systems, they're ideal for new builds, renovations, and properties where visual impact matters.

The decision between in-roof and on-roof ultimately depends on your specific circumstances, budget, and priorities. For existing homes with good roofs, traditional panels usually offer better value. For new builds or re-roofing projects, in-roof systems can be cost-effective and visually stunning.

CRG Direct installs both in-roof and on-roof solar systems. Our experts can assess your property and requirements to recommend the most suitable solution. Contact us for an honest evaluation of whether in-roof solar panels are right for your home.