BIPV Design for Architects: Facades and Roofs

Last updated: November 2026

SurgePV publishes this post and sells solar design software.

Every square meter of building envelope is a potential power plant. For architects, that idea has moved from theoretical to practical: building-integrated photovoltaics (BIPV) now ships as roof tiles, curtain wall glass, facade panels, and overhead canopies that generate electricity while doing the weatherproofing and shading jobs of conventional materials. Market forecasts for BIPV vary widely by research firm, so this guide avoids quoting one. What matters to a project team is simpler: building energy rules in many markets are pushing solar onto more buildings, and facades often offer more area than roofs.

This guide covers what architects need to specify, design, and coordinate BIPV: the five main product categories, design principles for orientation and shading, the design process from concept to permit, cell technology options, cost logic, code coordination, and daylighting trade-offs. Where a number depends on the product, region or edition of a standard, the guide says so and points you to the source to check.

In this guide:

• BIPV vs. BAPV and why the distinction matters for cost analysis
• Five BIPV product categories and what to check for each
• Design principles: orientation, shading, thermal management, structural loads
• A 9-phase BIPV design process
• Solar cell technology options for BIPV
• Net cost logic and payback method
• US and EU code coordination
• Daylighting trade-offs in BIPV glazing
• Built-project examples and market trends

The counts above describe this guide’s structure. They are not market data.

BIPV vs. BAPV: Why the Distinction Matters

BIPV replaces a building component, while BAPV adds panels to an existing surface. That one difference changes cost analysis, permitting and design timing.

BAPV (building-applied photovoltaics) mounts solar panels on top of an existing building surface. The roof or wall already exists and performs its weather-sealing function independently. Most residential and commercial rooftop solar installations are BAPV.

BIPV (building-integrated photovoltaics) replaces the conventional building material. The BIPV product is the roof, the facade panel, or the window. Remove it and the building envelope is incomplete.

This changes the cost comparison. A BIPV roof product can look expensive per watt next to a rack-mounted panel, but it also replaces roofing material that would have been bought anyway. The incremental solar cost is the difference between the two, which is usually closer to conventional panel economics than the gross price suggests.

BIPV also has a regulatory implication. Because the product is a building component, it falls under electrical codes and building codes together. The AHJ review is usually more involved than for BAPV, which is mainly an electrical permit.

Types of BIPV Products and Applications

Five product categories cover current commercial BIPV applications. Each has its own performance, design constraints and cost profile, and every figure below should come from the manufacturer’s datasheet for the exact product.

1. Solar Roof Tiles and Shingles

Solar roof tiles replace conventional clay, concrete, or asphalt roofing. The solar cells are embedded in the tile body, and non-solar tiles of matching appearance fill the gaps between active zones to keep a uniform look.

What to check for this category:

• Cell type and rated efficiency (monocrystalline silicon is common)
• Fire rating of the complete roof assembly, not only the module
• Product and power warranty terms
• Weight per area, then confirm structural capacity with the engineer

Best applications: Residential new construction, high-visibility institutional buildings, heritage areas with tile roof requirements, and situations where a rack-mounted array would be rejected on aesthetic grounds. Products on the market include Tesla Solar Roof and GAF Timberline Solar; check each maker’s own site for current availability and specifications.

The main limitation is orientation. Tiles follow the roof plane, so a north-facing pitch in the northern hemisphere produces little energy. Compare each pitch in a yield simulation before deciding which ones get active tiles.

2. Solar Facades and Curtain Wall Systems

Solar facade modules integrate into the vertical envelope, replacing cladding panels, spandrel glass, or curtain wall units. Facade area often far exceeds roof area on tall commercial and institutional buildings, which makes this a significant BIPV segment.

What to check for this category:

• Rated efficiency and the temperature behavior of the module type
• Ventilated gap behind the module, as specified by the manufacturer
• Structural attachment and design wind load for your location
• Cost per square meter from a project quote

Best applications: Commercial towers, office buildings, and public institutions where facade replacement is already planned and sun-facing exposure exists.

The EU’s 2024 recast of the Energy Performance of Buildings Directive pushes solar onto more buildings. The European Commission’s EPBD page says solar installations will become the norm for new buildings and will be rolled out for certain existing non-residential buildings. Read the directive text and your national transposition for exact deadlines, and see our guide to the EU solar rooftop mandate and EPBD for the country picture.

3. Solar Glazing: Windows and Skylights

Semi-transparent BIPV glazing replaces standard glass in windows, curtain walls, atriums, and skylights. Solar cells are laminated between glass panes, and visible light transmission (VLT) is set by cell density and spacing.

What to check for this category:

• VLT and the matching power output (lower VLT means more cells and more output)
• Thermal performance of the complete insulated glazing unit
• Available formats: fixed panels, spandrel units, roof lights
• Daylighting and glare impact on the occupied space

Best applications: Atriums, canopy roofs, sun-facing curtain walls, skylight replacements, and transit shelters, where glare control and energy generation overlap.

The trade-off is daylighting quality. A BIPV unit transmits less daylight than standard glazing, so supplemental artificial lighting may be needed. Model this in your energy analysis, because reduced solar heat gain can offset part of the extra lighting energy through lower cooling load.

4. Solar Canopies and Shading Systems

Canopies, pergolas, awnings, brise soleil, and louvre systems generate power while shading occupants and reducing cooling loads. These are often the most straightforward BIPV integration, because they are distinct architectural elements and not part of the weatherproofing envelope.

What to check for this category:

• Module type and whether it is frameless or framed
• Structural design for snow, wind, and live loads under local code
• Drainage and cable routing through the structure

Best applications: Parking structures, transit stations, school grounds, commercial plazas, covered walkways, and balconies that face the sun.

Canopy BIPV is also where solar carports have expanded, because parking canopies turn unproductive land above cars into generating area. Read the commercial solar carport design guide for a full walkthrough.

5. Solar Spandrel Panels and Cladding

Spandrel panels fill the zone between vision glass and floor slabs in curtain wall systems. They are opaque and already need to be weathertight, so they are a natural place for BIPV: the panel sees the same orientation as the vision glass above and below.

What to check for this category:

• Colour options and any efficiency penalty from custom colours
• Module dimensions that match the curtain wall grid
• Premium over the non-solar spandrel panel, from a quote
• Output rating per unit, from the datasheet

Best applications: Glass curtain wall buildings with spandrel zones, high-rise commercial, and mixed-use towers.

Key Design Principles for BIPV Integration

Orientation and Tilt

Yield depends on how much irradiance a surface receives, so orientation and tilt decide which surfaces are worth activating. Architects face three choices: which surfaces to activate, how to tilt non-roof surfaces if at all, and what yield penalty to accept for non-optimal orientations.

The relative order below applies at mid-latitudes in the northern hemisphere, and the gaps depend on latitude and climate, so simulate before relying on it.

A vertical facade yields less per square meter than a well-tilted roof. For tall buildings with far more facade than roof area, total facade output can still be larger in absolute terms. A deeper look at tilt angles and local irradiance is in the optimal tilt angle for solar panels guide. The ranking above breaks down at high latitudes and in cloudy climates, so always run a location-specific simulation.

Shading Analysis

Shading is a major variable in BIPV performance. Shade on part of a string can reduce the output of the whole string unless module-level power electronics are used. Facades in dense urban settings, where BIPV is architecturally most interesting, often see severe shading from adjacent towers, setbacks, and overhangs.

Run shading analysis at the earliest stage:

• Horizon profile: Define the obstruction angle in each azimuth direction
• Self-shading: For canopies and overhangs, adjacent rows can shade lower modules
• Seasonal variation: Winter sun angles are lower than summer angles, so winter shading is often worse

Use solar shadow analysis software to model annual shading loss before locking in module placement. A facade that looks well sited on a south elevation drawing can be shaded heavily in winter in a dense urban canyon.

Consider module-level power electronics, such as micro-inverters or DC power optimizers, for any facade with partial shading. With string inverters, one shaded panel can pull down the output of its whole string.

Thermal Management

PV cell output falls as temperature rises. The module datasheet lists a temperature coefficient that tells you how much. Facade modules can run hot on summer afternoons, so the operating output can be well below the nameplate rating at standard test conditions.

Ventilation behind the module is the usual fix. A ventilated cavity between the BIPV module and the building structure:

• Lowers module operating temperature
• Recovers some of the otherwise-lost generation
• Can also act as a thermal break for the wall

For roof tiles, ventilation is usually part of the assembly. For facade curtain wall systems, specify the cavity depth explicitly in the BIPV system documentation, using the manufacturer’s recommended value. Some curtain wall packages omit this to simplify the assembly.

Structural Integration

BIPV modules add dead load to the structure. Roof tiles can be heavier than asphalt shingles, facade panels add load to the curtain wall, and canopy structures must be designed for snow, wind, and module weight as a combined load case.

For new construction, these loads go into the structural design from the start. For retrofits, commission a structural assessment before specifying BIPV, because older roofs may need extra support. Wind loads usually govern facade BIPV structural design, so confirm that the curtain wall system carries a rating for the local design wind speed under the wind-load standard your jurisdiction adopts.

The BIPV Design Process: Step by Step

BIPV runs through the whole project delivery sequence and is not a plug-in decision. This is the process used on well-run BIPV projects.

Phase 1: Site and Energy Analysis (Pre-Schematic). Establish the site’s solar resource and envelope potential. Pull TMY (typical meteorological year) weather data for the location, map every potential BIPV surface, and calculate annual incident irradiance for each. Use the result to prioritize which surfaces justify BIPV. The solar irradiance data guide explains how to read GHI, DNI, and DHI.

Phase 2: BIPV Strategy Decision (Schematic Design). Select product categories from the site analysis and client priorities. Define target generation as a share of building energy demand, confirm budget parameters, and decide which surfaces carry active BIPV. This is the last low-cost chance to change surface geometry to improve solar yield.

Phase 3: Product Selection (Design Development). Specify products with vendor-provided performance data. For each product, obtain the STC power rating, temperature coefficient, warranty terms, fire rating, certification documents, dimensional tolerances, colour options, and BIM files. Request simulation-ready PAN files for energy modeling.

Phase 4: Energy Modeling (Design Development). Build a PV system simulation using the actual building geometry, product specs, and site weather data. Model each surface separately, with its own shading and orientation. Calculate annual energy production per surface, system losses (wiring, inverter, soiling, mismatch, temperature), performance ratio, and self-consumption ratio. The generation and financial tool can model BIPV system economics, including feed-in tariff revenue, self-consumption savings, and payback.

Phase 5: Electrical System Design (Design Development). Design the DC collection system: string configuration, wiring routes, and combiner locations. Facade BIPV needs vertical wiring chases built into the curtain wall, so coordinate with the curtain wall drawings early. Choose the inverter approach (micro-inverter, power optimizer with string inverter, or central inverter) from shading complexity and system scale, and set the inverter clipping ratio with the engineer of record.

Phase 6: Structural and Thermal Coordination (Design Development and Construction Documents). Give the structural engineer of record the dead load, wind pressures at corner, edge and field zones, and snow loads where they apply. Coordinate the ventilation cavity with the curtain wall or roofing specification and keep it clear at slab edges and penetrations.

Phase 7: Permit Package Preparation (Construction Documents). BIPV permit packages usually need both building and electrical documentation. Typical documents include the roof plan or facade elevation showing BIPV extent, a single-line electrical diagram, module spec sheets and certification, structural calculations, fire rating documentation for the roof assembly, a labeling plan, and the utility interconnection application. Check your AHJ’s checklist for the exact list.

Phase 8: Construction Administration. Inspect the ventilation cavity during curtain wall or roofing installation, because it is easy to compromise on site. Verify module placement against the electrical string design, and commission the inverter system before substantial completion: check string voltages, confirm monitoring, and test rapid shutdown as the adopted electrical code requires.

Phase 9: Post-Occupancy Monitoring. Monitor for at least 12 months and compare actual and modeled generation. A large deviation points to shading missed in the model, module mismatch in a string, inverter underperformance, or soiling. Fix problems in the first year, while the contractor is still on site.

BIPV Technology: Which Solar Cell Type to Specify

Not all BIPV products use the same cell technology, and the choice affects efficiency, form factor, colour, and transparency. Use manufacturer datasheets for exact efficiency; the table gives the general trade-offs.

For most architectural uses, monocrystalline silicon gives the best efficiency per area and the longest commercial track record. Thin-film products such as CdTe and CIGS suit projects where uniformity, flexibility, or custom dimensions matter more than peak efficiency.

Perovskite is the technology to watch because it allows colour tuning without the efficiency penalty of coloured crystalline silicon, but commercial availability and durability data are still limited. The TOPCon vs. HJT vs. perovskite comparison covers the cell trade-offs in depth. For glazing, amorphous silicon is a common choice because it is semi-transparent and looks uniform, while crystalline silicon in glazing appears as a grid of opaque cells.

BIPV Cost Analysis: What Architects and Clients Need to Know

BIPV costs are best understood in two layers: gross cost and net cost after material substitution. No single price per watt applies across products and regions, so get project quotes.

Gross vs. Net Cost Framework

Net incremental solar cost equals the installed BIPV cost minus the cost of the building material it replaces. The table lists what to subtract for each product.

Canopies are often the most financially attractive BIPV option, because the structure would be built anyway and the net solar premium can be modest. Glazing tends to be the most expensive on a net basis, although it also delivers shading and heat-gain reduction that can cut cooling loads. Check this with a building energy model for your climate.

An illustrative example, not market data: if a BIPV facade module costs 300 units per square meter installed and the cladding it replaces costs 180 units per square meter, the net incremental cost is 120 units per square meter. Divide that by the module’s rated watts per square meter to get net cost per watt.

Regional Pricing Differences

Prices differ by region because of market scale, product standardization, and local labor. Hardware is only part of the installed cost of a facade system. Electrical labor and curtain wall integration can be a large share, so a cheap module does not guarantee a cheap installed system. Ask suppliers for installed project quotes in your region.

Payback Analysis for Architects

When presenting BIPV economics to clients, use the net incremental cost as the investment base, and model three revenue streams:

1. Electricity generation savings or feed-in tariff revenue
2. Avoided cost of the building material replaced
3. Any applicable incentive or tax credit

Payback varies by product, climate, electricity price, and incentive, so no general range is reliable. Canopies and roof products often have the cleanest net-cost case, and glazing the weakest, but model each project.

Energy Yield: What Performance to Model

Model yield per surface from site weather data and the product’s datasheet, because published yield per square meter depends on climate, orientation and module efficiency. Use the formula: annual yield (kWh) = surface area (m²) x annual irradiation on that surface (kWh/m²) x module efficiency x performance ratio.

Yield per square meter is not the only metric. For tall buildings, the total facade area can be several times the roof area, so facades can matter more in absolute terms. Model each surface separately and sum them.

Model system-level losses separately. Key BIPV loss factors:

• Temperature losses: Higher for non-ventilated facades
• Wiring and DC losses
• Inverter efficiency loss
• Soiling: Often lower on vertical facades because rain cleans them, but site-specific
• Module mismatch
• Shading losses: Site-specific, so model them explicitly

Use the performance ratio as a check on the model and on measured results, not as a target number from a rule of thumb. For roof BIPV, the solar panel layout design guide covers spacing and orientation principles that apply to roof-integrated tiles as well as rack-mounted systems.

BIPV and Building Codes: What Architects Must Know

BIPV sits at the intersection of electrical codes, building codes, and fire safety standards. The electrical engineer handles electrical code compliance, but the architect of record is responsible for building code and fire compliance. Standards change by edition, so check the edition your jurisdiction has adopted rather than relying on a number from a guide.

US Code Framework

• NEC Article 690 covers PV system wiring, grounding, overcurrent protection, disconnecting means, and rapid shutdown. Rapid shutdown requirements differ by NEC edition, so check the adopted edition for the conductor boundary and voltage and time limits.
• NEC Article 705 applies when the BIPV system is an interconnected power production source connected to the grid.
• IBC and IRC (building codes) govern structural loads, fire-resistance ratings for roof assemblies, and exterior wall assemblies. Verify the rating of the whole assembly. A module rating alone is not enough where the code regulates the roof assembly.
• Product certification: Check which module safety standard your AHJ requires and ask the manufacturer for the certificate. Facade and glazing products may need further certifications, such as safety glazing and curtain wall testing.
• NFPA 855 applies if the BIPV project includes integrated battery storage. See adding battery storage services for more.

EU Code Framework

• EPBD (2024 recast): Solar installations are to become the norm for new buildings and are to be rolled out for certain existing non-residential buildings, per the European Commission. Read the directive and your national transposition for deadlines.
• EN 50583: The European standard for photovoltaics in buildings, with a part for BIPV modules and a part for BIPV systems. See the EN 50583-2 listing for scope, and buy the current edition from CENELEC or your national standards body before you cite requirements.
• IEC module standards: Check the module qualification and safety standards that apply to grid-connected PV products in the country of the project.

AHJ Coordination

The Authority Having Jurisdiction review is often the practical gating item for BIPV projects. Many AHJs have limited experience with BIPV and may apply rack-mounted PV requirements that do not fit integrated products. Common friction points:

• Fire setback requirements written for rack-mounted roof panels may or may not apply to integrated roof products, and the AHJ may ask for variance documentation
• Curtain wall BIPV may need review under both the building permit and a separate electrical permit
• Solar glazing classified as a structural element may need an engineering letter from the professional of record

Engage the AHJ at pre-application stage, before design development, and bring the manufacturer’s technical documentation.

Daylighting, Thermal Comfort, and Occupant Experience

Architects often treat BIPV glazing as a straightforward swap for standard glass. It is not, and the occupant experience in BIPV-glazed spaces needs analysis.

Daylighting Trade-offs

Check the minimum recommended illuminance for each space type against the lighting standard or guide your project follows (for example the IES recommended practice), instead of relying on a number from a general article. Then model daylight autonomy and useful daylight illuminance for the BIPV-glazed spaces.

The problem is usually the winter overcast case. A skylight that delivers plenty of light at summer midday can fall short on a dark December day, especially in the lower part of a deep space. If BIPV glazing pushes the space below your daylight target, count the extra lighting energy in the net energy balance, because it can offset part of the generation gain.

Glare Control

Semi-transparent BIPV glazing can distribute light more evenly than clear glass, which may reduce glare. At low transmission with high exterior illuminance, glare can still be a problem when occupants have direct sightlines to the glazing. Switchable glazing options exist but add product cost, so ask manufacturers for current pricing.

Thermal Comfort

A BIPV facade with a ventilated cavity can reduce heat gain compared with a dark cladding, because the cells convert part of the absorbed sunlight to electricity and the cavity carries heat away. In warm climates this can lower cooling loads, which may reduce HVAC sizing and partly offset the BIPV premium.

In cold climates the same effect can be a liability, because the facade intercepts solar radiation that might have contributed to passive solar heating. Run building energy simulations for both heating and cooling seasons before finalizing facade BIPV extent.

Real-World BIPV Projects

Public BIPV projects show what the technology can do and where it struggles. Figures for each project should come from the owner or designer, so check their own documentation before quoting numbers.

• SwissTech Convention Center, Lausanne. A facade using dye-sensitized solar cells in different colours. It is best known for demonstrating non-silicon, coloured BIPV at building scale, with aesthetics as the priority over yield.
• CIS Tower, Manchester. A retrofit in which solar cladding replaced the original facade on an office tower. It shows that facade BIPV retrofits are possible at commercial scale, and that urban shading is a major driver of actual output.
• Ludesch community centre, Austria. A canopy-style BIPV installation at a public building entrance. It is a useful example of treating the PV as part of the structure that would have been built anyway.

BIPV Market Trends and What Architects Should Track

Several trends shape BIPV design decisions, and each is a direction to watch, not a forecast with a date.

Solar in building codes. The EU EPBD recast makes solar installations the norm for new buildings. The US has no equivalent federal mandate, but some states and cities have their own solar requirements for new construction. Architects in regulated jurisdictions will increasingly meet BIPV as a compliance path.

Colored and textured BIPV. First-generation BIPV was mostly dark blue or black. Crystalline silicon products now offer textures and colour variation, and perovskite may extend colour options if it reaches commercial durability.

Curtain wall manufacturer integration. Some curtain wall system makers offer BIPV-integrated units, where solar cells are installed in the factory before shipping. This reduces on-site integration complexity.

BIPV plus storage. Battery storage co-located with BIPV allows self-consumption optimization, storing midday facade generation for evening use. The solar plus storage glossary entry covers the architecture options.

BIM integration. BIM-integrated BIPV objects can carry performance, structural, and energy model data in one file, which eases coordination between architect, structural engineer, and electrical engineer.

BIPV is entering the standard toolkit for architects working on net-zero and high-performance buildings, so the specification skills here are increasingly part of normal practice.

Designing BIPV with Solar Software

Solar design software handles simulation complexity that spreadsheets struggle with: multi-surface energy modeling, shading analysis for facades with adjacent obstructions, string design for non-standard module dimensions, and financial modeling that accounts for material substitution. SurgePV supports 3D roof modeling, solar array layout, shading analysis, energy-yield modeling, and financial modeling. Whether a given BIPV product can be modeled depends on its available module data, so ask for a test with your chosen product in a demo.

Key software requirements for BIPV design:

• 3D building geometry input, not just a flat roof plane
• Facade-specific shading analysis (horizon profile and building self-shading)
• Custom module dimension support, since BIPV products rarely come in standard panel sizes
• String design for vertical, non-homogeneous arrays
• Multi-surface output reporting (roof, facade, and canopy as separate systems)

Conclusion

BIPV is where architecture and energy generation meet. When one product does two jobs, shelter and power, the economic and design case can be stronger than either function alone. Three actions for architects taking BIPV from concept to project:

• Engage BIPV at schematic design. Surface geometry, orientation, and ventilation cavity decisions made early are difficult and expensive to reverse in construction documents.
• Run net cost analysis, not gross. Present BIPV economics as the incremental cost above the building material being replaced. That is the accurate comparison for a client.
• Model before specifying. Annual yield, shading losses, and performance ratio vary by surface and location. Simulation before product selection prevents expensive underperformance after construction.

Ready to test your own surfaces? Book a SurgePV demo or read more about solar design software.

Frequently Asked Questions

What is the difference between BIPV and BAPV?

BIPV (building-integrated photovoltaics) replaces a building material such as roofing, cladding or glazing with a solar-generating product. BAPV (building-applied photovoltaics) adds panels on top of an existing surface. BIPV has a higher gross cost, but the cost of the replaced material can offset part of it.

How much does BIPV cost compared to conventional solar?

BIPV usually costs more per watt than rack-mounted panels, but the fair comparison is net cost: the BIPV price minus the cost of the roofing, cladding or glazing it replaces. Prices vary by product, region and project, and no single figure applies. Ask manufacturers for project quotes and compare on a net basis.

What are the main types of BIPV products for architects?

The five main categories are solar roof tiles and shingles, solar facades and curtain walls, solar glazing for windows and skylights, solar canopies and shading systems, and solar spandrel panels. Each has different efficiency, transparency, structural and cost trade-offs, so pick the category from the surface and the design goal.

What building codes apply to BIPV in the US?

BIPV is covered by both electrical and building rules. The NEC articles for PV systems and interconnected power sources, the building and fire codes your jurisdiction has adopted, and product certification all apply. Check the adopted edition of each standard with your authority having jurisdiction (AHJ) before design development.

Can BIPV completely replace conventional roofing materials?

Some BIPV roof products are designed to act as the roof covering, but only if the complete assembly has the weatherproofing and fire rating your jurisdiction requires. Check the manufacturer’s documentation and the AHJ’s requirements for the whole roof assembly, not just the module.

What is the payback period for BIPV?

Payback depends on net cost, local irradiance, electricity prices and incentives, so no general figure is reliable. Calculate it from the net incremental cost above the replaced material, using a site-specific yield simulation. Confirm tax credit eligibility with a tax advisor before showing payback to a client.

How does BIPV affect daylighting inside a building?

BIPV glazing reduces visible light transmission compared with standard glass, because cells block part of the light. Architects must balance generation against minimum illuminance for the space. Model daylight autonomy and the extra lighting energy before finalizing glazing extent.