Sample Quote – Photovoltaic Roof Tiles for 120m2 House

Choosing photovoltaic roof tiles is a decision about your home’s energy financing model for the next 30-40 years. It’s not just about roof covering—it’s a decision about operating cost structure, property value, and energy independence. For a 120 m² home with a gable roof of approximately 160-180 m², estimating photovoltaic roof tile installation requires understanding several decision layers you must navigate before even talking to a contractor.

Below I present a cost and consequence analysis model that will help you assess whether photovoltaic roof tiles are the right solution for your project, budget, and how you’ll use your home.

Decision sequence model: what you must determine before getting a quote

Photovoltaic roof tile pricing doesn’t start with asking the price per m². It starts with establishing parameters that determine both the cost and economic viability of the investment. Here’s the sequence of decisions you must make before receiving a credible quote.

Decision 1: Home energy demand

The first step is determining how much energy your home will consume. For a 120 m² home with a heat pump, mechanical ventilation, and standard appliance use, annual demand typically ranges from 6,000-9,000 kWh. If you’re planning to charge an electric vehicle, add another 3,000-4,000 kWh annually. This figure determines what system capacity you need.

Photovoltaic roof tiles like Electrotile generate approximately 130-150 Wp per m². For a 170 m² roof (typical for a 120 m² home), you can achieve a 22-25 kWp system, which under Polish sunlight conditions produces about 20,000-23,000 kWh annually. That’s enough to fully cover your demand with significant surplus that you can store or feed into the grid.

Decision 2: Type of photovoltaic roof tile

There are two main types: integrated metal roof tile with photovoltaics and standing seam metal roofing with PV integration. The choice depends on aesthetics, roof construction, and expected durability. Standing seam (such as Electrotile Standing Seam) is a premium solution—more watertight, more durable, visually minimalist. Integrated metal tile is cheaper to install but requires more precise detail work.

This choice affects pricing by 20-30%. It’s not about saving money—it’s about matching the architecture and roof structure.

Decision 3: Energy storage—now or later

Photovoltaic roof tiles without energy storage is a halfway solution. You produce energy during the day, but peak consumption occurs in the evening and night. A 10-15 kWh storage system enables 70-80% self-consumption, which radically changes the installation’s economics. Storage costs 25,000-40,000 PLN, but without it you’re feeding energy into the grid that you later buy back at a higher price.

If you’re not installing storage immediately, ensure the system is prepared for future addition—appropriate inverter, wiring, space in the distribution board. Changing this decision after construction is complete costs an additional 5,000-8,000 PLN.

Cost Structure: What the Quote Includes

A quote for solar roof tiles on a 120 m² house comprises several cost layers that you need to understand separately to properly evaluate a contractor’s offer. Below is a typical structure for a 22 kWp installation with standing seam metal roofing like Electrotile.

Layer 1: Roofing with Integrated PV

Cost of solar roof tiles (metal roofing + integrated modules): 120,000-160,000 PLN. This includes materials, delivery, and installation. The price depends on the type of metal roofing, module power output, manufacturer, and roof complexity (number of slopes, pitch angle, details around chimneys and skylights).

This price covers complete roof coverage — you don’t add traditional tiles or separate metal roofing. This is crucial when comparing to a conventional roof + add-on solar panels, where total costs typically run 90,000-110,000 PLN, but with inferior aesthetics, lower durability, and leak risks.

Layer 2: Electrical Installation and Inverter

Hybrid inverter (ready for energy storage), DC/AC wiring, protection devices, connection to distribution panel: 15,000-22,000 PLN. This cost cannot be reduced — inverter quality determines the entire system’s efficiency and future expansion capability.

Layer 3: Energy Storage (Optional)

10-15 kWh battery with installation and integration: 25,000-40,000 PLN. If you opt for storage immediately, you gain complete energy independence and the shortest payback period. If you postpone this decision, budget for it down the road.

Layer 4: Documentation and Formalities

Installation design, grid operator notification, prosumer agreement, technical acceptance: 3,000-5,000 PLN. Some contractors include this in the installation price, others bill separately. Ensure the quote covers full administrative support — this isn’t an area to cut corners on time.

Total (without storage): 138,000-187,000 PLN
Total (with storage): 163,000-227,000 PLN

Investment Priority Matrix: How to Assess if It Makes Sense

An amount of 160,000-220,000 PLN is a significant line item in a construction budget. The decision about solar roof tiles isn’t a decision about a roof—it’s a decision about the home’s energy model. Below, I present a tool that will help you assess whether this investment aligns with your priorities.

Priority: Operating Costs

Solar roof tiles with energy storage reduce electricity bills by 80-90%. For a home consuming 9,000 kWh annually (costing approximately 7,000-8,000 PLN/year at current prices), return on investment occurs after 20-25 years. Without subsidies. If energy prices rise (which is likely), the payback period shortens to 15-18 years.

This isn’t a speculative investment—it’s a decision about cost predictability for the coming decades.

Priority: Property Value

A home with a solar roof and energy storage is a home without technological debt. Buyers won’t need to invest in energy upgrades for the next 30 years. In the premium segment, this is a standard that increases property value by 10-15% compared to a home of identical size with a traditional roof and gas heating.

Priority: Aesthetics and Architecture

Solar roof tiles like Electrotile create a uniform surface without protruding panels, cables, or mounting structures. For modern architecture—minimalist, barn-style, flat roof with accents—it’s the only solution that doesn’t compromise the building’s form. If aesthetics is a priority, the difference between a roof with mounted panels and integrated solar tiles is disproportionate to the price difference.

Priority: Independence and Flexibility

Solar roof tiles with storage are the foundation of a self-sufficient home. You can add a heat pump, car charger, air conditioning—without worrying about rising bills. It’s flexibility you can’t buy later—either you build a home with the future in mind, or you’ll be retrofitting in 10 years, wasting time and money.

Checklists for Contractor Discussions

A quote isn’t just the final number on an estimate. It’s a set of assumptions you need to verify before signing a contract. Below are control questions that will help you assess whether the offer is complete and if the contractor understands the specifics of integrated installation.

Questions About Quote Scope

• Does the quote cover complete roof covering, or only photovoltaic modules?
• Does the price include installation, transport, scaffolding, and site security?
• Does the quote include a hybrid inverter prepared for energy storage?
• Are documentation and formalities (grid operator notification, prosumer agreement) included in the price?
• What’s the warranty scope — separate coverage for roofing, PV modules, inverter, and labor?

Technical Specification Questions

• What’s the system capacity (kWp) and estimated annual production (kWh)?
• What type of solar roofing is planned (standing seam metal, metal tile)?
• Which module manufacturer and what cell efficiency?
• Is the system scalable — can I add energy storage in a year without reconstruction?
• What are the module power warranty terms (standard 25 years, minimum 80% initial capacity)?

Implementation Questions

• What’s the timeline — when’s installation, inspection, commissioning?
• Who coordinates with other contractors (carpenter for skylights, roofer for chimneys)?
• Does the contractor provide post-warranty service and what’s the response time?
• Are there additional costs if roof structure reinforcement becomes necessary during installation?

Investment Summary

A solar roofing quote for a 120 m² house isn’t just a figure of 160,000-220,000 PLN. It’s a decision about your home’s energy balance for the next 30-40 years. The key is understanding you’re not buying roof covering — you’re buying an energy financing model, independence from rising electricity prices, and value that doesn’t depreciate over time.

The most important decisions must be made before talking to contractors: determine energy requirements, choose roofing type, decide on energy storage. Only then does a quote become a tool for comparing offers, not a source of confusion.

At Rooffers, we believe a premium home is one without technological debt. Solar roofing is an investment that settles the energy question once for the building’s lifetime. If you’re building a new home, this is the only moment you can make this decision without compromises and without reconstruction costs. Use it.