Are you thinking about fitting your 100m² house with solar panels and wondering how much it will cost? It’s a question many homeowners ask themselves. With the constant evolution of technologies and available assistance, it’s not always easy to see clearly. In this article, we’ll detail the solar panel price for a 100m2 house, with an estimate for 2025, based on seven essential points. The aim is to give you a precise idea of the expenses to be expected and the savings that can be made.

Key Points to Remember about solar panel price

• The cost of a solar installation for a 100m² house varies greatly, between £6,000 and £19,000, depending on the power and brand of the panels.
• A 100m² house needs, on average, a 3 kWp installation, which represents around 8 solar panels.
• It’s important to carry out a thermal assessment with a professional to properly size your installation and get the best value for money.
• Assistance such as the self-consumption premium and the resale of surplus to EDF OA can reduce the total cost of your project.
• For an exact estimate, request several quotes from certified RGE installers. This will help you avoid unpleasant surprises.

1. Solar Panels

Investing in solar panels is an important decision, especially when it comes to powering a 100m² house. It’s essential to understand the various aspects linked to these devices in order to make an informed choice. In 2025, the solar panel market continues to evolve, offering a variety of options in terms of technology, performance and cost.

It’s important to note that the price of solar panels can vary considerably depending on several factors, including the type of panel, its power, and the manufacturer.

Here are a few points to consider:

• Type of panels: There are mainly three types of solar panels: monocrystalline, polycrystalline and thin-film. Monocrystalline panels are generally more efficient, but also more expensive. Polycrystalline panels offer a good compromise between cost and performance. Thin-film panels are cheaper, but their efficiency is often lower.
• Power: The power of solar panels, expressed in Watt-peak (Wp), determines the amount of electricity they can produce under optimal conditions. For a 100m² house, it’s generally recommended to install a system with a power of between 3 and 6 kWp, depending on your energy consumption.
• Efficiency: The efficiency of a solar panel indicates its ability to convert sunlight into electricity. Higher efficiency means greater electricity production for a given surface area.

It’s also important to consider the nomadic applications of flexible solar panels, which can complement a fixed installation for specific needs. Don’t forget to consult a certified RGE installer for a personalised study and a precise quote. Solar panel prices vary, but on average, expect to pay between £350 and £600/m² for photovoltaic panels, according to information available in 2025.

2. Installation

The installation of solar panels is a crucial step in guaranteeing the performance and durability of your system. It’s essential to understand the different phases and associated costs in order to best anticipate your project.

Installation costs

Installation costs can vary considerably depending on several factors. The complexity of the project, the geographical location and the type of mounting directly influence the final price. A roof installation, for example, may prove more expensive than a ground installation due to technical constraints and the need for specialised labour. It’s therefore important to assess these aspects carefully before getting started. For a 100m2 house, an solar installation with a power of around 3 kWp is required on average.

It’s strongly recommended that you request several quotes from qualified RGE (Reconnu Garant de l’Environnement – Recognised Guarantor of the Environment) installers. This approach will enable you to compare offers and choose the one that best suits your needs and budget.

Additional technologies

The integration of storage batteries and energy managers represents a larger initial investment, but these technologies considerably improve self-consumption and the overall efficiency of your installation. Batteries store excess energy produced during the day for later use, particularly in the evening or on cloudy days. Energy managers optimise the distribution of electricity according to your needs, reducing your dependence on the public grid.

Administrative procedures

Before proceeding with the installation of your solar panels, it’s essential to carry out certain administrative procedures. For a detached house, it’s crucial to check for any local restrictions regarding the installation of external systems. In a flat, the agreement of the co-ownership is often necessary to avoid any conflict. It’s also important to make a prior declaration of works to your local town planning department. This step is crucial as the external unit may not comply with local regulations. The local authority has one month to reply. If there is no reply, your application is considered accepted. Don’t forget to consult the co-ownership regulations to check authorisations.

Choosing the right installer

Choosing the installer is a crucial step in guaranteeing the success of your solar project. It’s important to select a qualified and experienced professional who can advise you on the sizing of your installation, the choice of equipment and the administrative procedures to be carried out. Don’t hesitate to ask for references and check the installer’s certifications before signing a contract. A 6 kWp installation with 350 Wp solar panels will require 17 350 Wp panels. This installation will therefore cover 30 m² of surface area. Estimate the amount of your installation in 2 clicks!

Here are a few points to consider when choosing your installer:

• Check their qualifications and certifications (RGE, QualiPV, etc.).
• Ask for references and contact former customers.
• Compare quotes and guarantees offered.
• Make sure they have professional indemnity insurance.

3. House

The suitability of solar panels for your 100m² house is a determining factor in estimating the price. Several aspects of your home influence the total cost of the installation. It’s important to consider the orientation of the roof, its inclination, and any obstacles that could cast shadows on the panels. These elements directly affect the amount of solar energy your installation can capture.

Type of Roofing

The type of roofing plays an important role in the cost and complexity of the installation. A tiled roof will be easier to equip than a slate or zinc roof, which can influence the final price. In addition, the condition of the roof is an element not to be neglected. If your roof is old and needs repair, you’ll need to budget extra for renovation before installing the solar panels. It’s crucial to ensure that the roof can support the weight of the panels and withstand the weather.

Orientation and Inclination

The ideal orientation for maximum solar energy production is due south. An inclination of around 30 to 40 degrees is also recommended. However, it’s possible to install solar panels on roofs facing east or west, although energy production will be slightly lower. The inclination of the roof can also be adjusted using specific supports, but this can incur additional costs. It’s therefore important to assess the orientation and inclination of your roof to optimise solar energy production and estimate the cost of the installation. To optimise the comfort of your home, choose air conditioning adapted to the surface area to be cooled.

Available Surface Area

The available surface area on your roof is a determining factor in the amount of energy you can produce. For a 100m² house, the roof area needed to install solar panels will depend on your energy consumption and the power of the panels chosen. In general, you need between 20 and 40 m² of solar panels to cover a significant proportion of the consumption of a house of this size. It’s therefore important to measure the available surface area on your roof and compare it to your energy needs to determine the number of panels required. Don’t forget to take into account any obstacles such as chimneys, roof windows or trees that could reduce the available surface area. Regulations in France and Europe are pushing for the construction of more energy-efficient buildings, these systems are becoming essential.

It’s important to note that installing solar panels can also increase the value of your home. In fact, a house equipped with solar panels is more attractive to potential buyers, as it reduces energy bills and contributes to environmental protection. It’s therefore an investment that can be profitable in the long term.

Obstacles and Shading

Shading from trees, neighbouring buildings or even elements of your own home (chimney, aerials) can considerably reduce the energy production of your solar panels. It’s therefore important to assess any shading and minimise it as much as possible. If trees are causing the shading, it may be necessary to prune or fell them. If neighbouring buildings are casting shadows, it may be more difficult to find a solution, but it’s possible to optimise the location of the panels to minimise the impact of the shading. The ideal orientation for maximum solar energy production is due south. An inclination of around 30 to 40 degrees is also recommended. However, it’s possible to install solar panels on roofs facing east or west, although energy production will be slightly lower. The inclination of the roof can also be adjusted using specific supports, but this can incur additional costs. It’s therefore important to assess the orientation and inclination of your roof to optimise solar energy production and estimate the cost of the installation. For a detached house, it’s crucial to check for any local restrictions.

4. Energy Consumption

It’s essential to accurately assess the energy consumption of your 100m² home before considering the installation of solar panels. This step allows you to correctly size your installation and optimise your investment. Several factors influence this consumption, including the number of occupants, consumption habits, the type of heating used and the quality of insulation.

Assessment of Electrical Needs

To determine the number of solar panels required, it’s essential to assess your electricity needs. Several elements must be taken into account:

• The number of occupants and their presence in the home: The more people there are and the more time they spend at home, the higher the consumption.
• The type of heating and the quality of insulation: Electric heating consumes more than gas heating, and poor insulation increases needs.
• The electrical appliances used: Refrigerator, freezer, washing machine, tumble dryer, air conditioning… Each appliance has a specific consumption.

It’s recommended that you consult your electricity bills from previous years to obtain an accurate estimate of your annual consumption. You can also use online tools or call on a professional to carry out an energy audit.

Factors Influencing Consumption

Several factors can influence the energy consumption of a 100m² house:

• The age of the building: Houses built before 1975 tend to be less well insulated and therefore more energy-intensive. In fact, a house built before 1975 consumes an average of 17,228 kWh per year, compared with 12,828 kWh for a house built after 1975.
• The number of occupants: A family of four consumes more than a couple. It’s therefore important to take into account the composition of your household.
• Consumption habits: Some people are more attentive to their consumption than others. It’s important to adopt simple measures to reduce your consumption, such as turning off lights when leaving a room or unplugging appliances on standby.

Calculation of Required Power

To calculate the required power of your solar installation, you need to divide your annual consumption by the number of days in the year. For example, for a house built before 1975, this gives: 17,228 kWh / 365 days = 47.2 kWh per day. For a more recent house, the calculation is as follows: 12,828 kWh / 365 days = 35.2 kWh per day. Your solar project will therefore need to produce at least 50 kWh per day (38 kWh for a more recent house) for total self-consumption. It’s important to note that these figures are averages and may vary depending on your personal situation. For a more accurate estimate, it’s advisable to call on a professional. Don’t forget that for total self-consumption, it may be necessary to equip yourself with solar batteries in order to store the electricity produced during the day and be able to use it at night.

Average Consumption and Solar Panels

A 100 m² house without electric heating consumes between 1,800 and 4,500 kWh per year. It’s therefore relevant to ask whether solar panels can cover this consumption. For a 100m2 house with two occupants, the estimated average electricity consumption is 8,442 kWh per year. It’s therefore important to assess your needs carefully before choosing the power of your solar installation. Don’t hesitate to consult a Solencia expert to help you with your project.

5. Energy Savings

Reducing your electricity bill is pretty much everyone’s goal, isn’t it? With solar panels, it’s entirely possible. Installing solar panels, even if it doesn’t cover all of a household’s consumption, represents a considerable boost for the wallet. There’s a clear reduction in the electricity bill, not to mention the benefit to the planet with energy production that emits no greenhouse gases. It’s a bit like combining business with pleasure.

The ambition is clear: to achieve a 60% reduction in energy consumption by 2050 compared with 2010. To achieve this, intermediate targets have been set: -40% in 2030 and -50% in 2040.

How to maximise your energy savings with solar power?

To really take advantage of energy savings, you need to optimise your installation. This involves several steps:

1. Size your installation correctly: There’s no point in going too big if your consumption is low. A properly sized solar project is key.
2. Monitor your consumption: Identifying the most energy-intensive appliances allows you to adapt your habits and reduce your overall consumption.
3. Regularly maintain your panels: Clean panels capture sunlight better and produce more electricity.

The impact of energy consumption on savings

The energy consumption of a 100 m² house varies considerably depending on its year of construction and insulation. For example:

• House built before 1975: average consumption of around 17,228 kWh per year.
• House built after 1975: average consumption of around 12,828 kWh per year.

These figures show that good insulation is essential to reduce consumption and, consequently, increase savings from solar panels. Think about thermal insulation, the choice of materials and regular maintenance. In addition, the integration of innovative and intelligent technologies offers new perspectives for optimising these performances. Finally, energy efficiency and sustainability are key aspects to consider.

Selling surplus: an additional income

A 6 kWp installation is perfectly suited to a 100 m² house. It can produce around 10,000 kWh per year, which represents a saving of more than half of the energy consumption. But that’s not all! With the surplus sales system, the surplus produced is directly reinjected into the national grid and therefore resold. This is a significant additional income.

Financial aid: a boost for investment

Installing solar panels represents a significant initial investment. Fortunately, numerous financial aids are available to alleviate this burden. It’s important to find out about the financial aid available and put together a solid application to benefit from it. This aid can considerably reduce the cost of installation and make the project more accessible.

6. Heat Pump

The heat pump (HP) is an increasingly popular alternative for domestic heating, and for good reason. It offers an energy-efficient solution that can significantly reduce your bills while minimising your environmental impact. But how does it fit into the context of a 100m² house and what is its estimated cost for 2025?

Heat Pump: The Basics

A heat pump, unlike a traditional heating system, does not generate heat. It transfers it from one place to another. There are different types of heat pumps, including air-to-air, air-to-water and geothermal heat pumps. Each has its own advantages and disadvantages, and the choice will depend on your specific needs and budget.

Types of Heat Pumps and Estimated Costs

• Air-to-air heat pump: This is often the most affordable option. It captures heat from the outside air and diffuses it inside your home. The cost of air-to-air heat pump installation for a 100m² house is generally between £5,000 and £7,500.
• Air-to-water heat pump: It also uses outside air, but transfers the heat to a central water heating system (radiators, underfloor heating). The cost is higher, between £6,500 and £10,000 for a 100m² house.
• Geothermal heat pump: This is the most efficient, but also the most expensive. It draws heat from the ground, where the temperature is more stable. Installation can cost between £12,500 and £21,000 for a 100m² house.

Factors Influencing Cost

Several factors can influence the cost of a heat pump for your 100m² house:

1. The type of heat pump: As mentioned above, geothermal pumps are more expensive than air-to-air pumps.
2. The brand and model: Prices vary considerably from one brand to another.
3. The complexity of the installation: If your house requires significant modifications for the installation, the cost will increase.
4. Financial aid: Government aid and tax credits can significantly reduce the initial cost. It’s important to find out about the government aid available.

Heat Pump and Solar Panels: A Winning Combination

Combining a heat pump with solar panels is an excellent way to maximise your energy savings and reduce your carbon footprint. Solar panels can provide the electricity needed to run the heat pump, reducing your dependence on the electricity grid and your bills. It’s a larger initial investment, but one that can be very profitable in the long term.

Installing a heat pump is an important investment, but one that can save you money on your energy bills in the long term. What’s more, it helps reduce greenhouse gas emissions, which is good for the environment.

In conclusion, the cost of a heat pump for a 100m² house in 2025 will depend on several factors. It’s important to do your research, compare offers and take into account the financial aid available before making a decision. Don’t hesitate to ask for quotes from several installers to obtain an accurate estimate tailored to your situation.

7. Solar Heating

Solar heating is an interesting alternative for reducing your dependence on traditional energy sources. There are two main types of systems: active and passive. The choice will depend on your needs, your budget and the characteristics of your home. A preliminary assessment is recommended to determine the most suitable solution.

Solar heating can significantly reduce your energy bill, while contributing to a more sustainable environment.

Here are a few things to consider:

• The type of system (active or passive).
• The surface area available for solar collectors.
• The orientation and inclination of your roof.
• Your current energy consumption.

An active solar heating system uses collectors to capture heat from the sun and transfer it to a heat transfer fluid, which then distributes it throughout your home. A passive system, on the other hand, uses the design of the building and the materials to maximise the absorption and distribution of solar heat. For a 100m2 house, it’s important to size the system correctly so that it’s effective. It’s possible to combine solar heating with other systems, such as a heat pump, to optimise your thermal comfort.

Solar heating is an environmentally friendly and economical long-term solution. It’s important to find out about the financial aid available to reduce the cost of installation. Don’t hesitate to contact a professional to obtain a personalised quote tailored to your needs. Remember to check the costs of solar panels for a solar heating installation.

Solar heating is great for the planet and your wallet! Imagine: the sun heats your house, and you save money on your bills. To find out more about how it works and whether it’s right for you, visit our website now.

In summary: solar energy, a choice that counts

As we’ve seen, installing solar panels on a 100 m² house in 2025 is a project that requires careful thought. You need to take quite a few things into account: the size of the installation, the type of panels, and of course, your energy consumption. But in the end, it’s an investment that can really pay off in the long term. Not only do you save money on your bills, but you also participate in something bigger: the energy transition. It’s good for your wallet and for the planet. So, if you’re still hesitating, remember that solar power is a solution for the future, and there’s help available to give you a boost. Don’t forget to ask for several quotes to find the offer that suits you best!

Frequently Asked Questions

How many solar panels are needed for a 100 m² house?

For a 100 m² house, a solar installation of around 3 kWp is generally required, which corresponds to roughly 8 solar panels. However, the exact number depends on your electricity consumption and the specific features of your house.

What is the price of a solar panel installation for a 100 m² house?

The cost of a solar panel installation for a 100 m² house generally varies between £6,000 and £19,000. This price can change depending on the power of the installation, the number of panels and their brand.

Is there any help available for the installation of solar panels?

Yes, there are several forms of financial aid available. You can benefit from the self-consumption premium, paid one year after commissioning, and from the resale of surplus electricity production to EDF Obligation d’Achat. The amounts depend on the power of your installation and are updated regularly.

How much can a 100 m² solar panel installation earn?

A 100 m² solar panel installation can produce around 20 kWp. This can generate up to £2,500 per year, depending on the purchase price of electricity, the amount of sunshine in your region and the orientation of your panels.

How do I determine the solar power needed for my house?

To find out how much power you need, you need to estimate your annual electricity consumption. Take into account the number of people in your household, your lifestyle, your heating method and all your electrical appliances. A professional can help you carry out an accurate thermal assessment.

Should I choose self-consumption or total resale of my solar electricity?

The choice depends on your objectives. Self-consumption allows you to consume the electricity you produce and reduce your bills. Total resale consists of selling all your production to a supplier. Surplus resale combines the two: you consume what you need and sell the rest. Each option has its financial advantages.

Who should install the solar panels?

It is strongly recommended that you use a certified RGE (Reconnu Garant de l’Environnement – Recognised Guarantor of the Environment) installer. These professionals are qualified and ensure that your installation complies with standards, which is often a condition for benefiting from financial aid.

How do I get an accurate estimate of the cost of my installation?

To obtain an accurate estimate tailored to your situation, it is advisable to request at least three quotes from different qualified installers. This will allow you to compare offers and choose the most advantageous solution for your project.