M&E Contrax Resources
Solar Panel Costs
Resource Highlights:
Solar PV pricing depends on system size, roof complexity, and component choice.
Batteries add cost but can improve savings by increasing self consumption.
The best quotes are clear on what is included, warranties, monitoring, and any grid connection requirements.
What You Can Expect to Pay
Solar panels are a long term investment, so it makes sense to understand the costs properly before you commit. The price of a solar PV system varies from property to property because every roof, usage pattern and design requirement is different.
This guide explains what affects solar panel costs, what is usually included in a professional quote, and how to compare installers so you get the right system, not just the cheapest headline figure.
What affects the cost of solar panels?
System size and number of panels
One of the biggest cost drivers is the system size, often described in kilowatts (kW). More panels generally means a higher upfront cost, but it can also mean higher generation and improved long term value when the system is matched to your usage.
A good installer designs the system around:
how much electricity you use
when you use it
how much roof space and usable area you have
Panel quality and efficiency
Not all solar panels are the same. Higher efficiency panels can generate more electricity per square metre and may be a better option where roof space is limited. Differences in build quality and warranty terms can also affect price.
When comparing panels, look for:
efficiency rating
manufacturer warranty terms
performance warranty, how the output is expected to hold up over time
Inverter choice
The inverter is the component that converts solar electricity into usable power. It also affects monitoring and system performance. The type of inverter needed depends on your design and whether you want battery storage now or later.
Common options include:
string inverters
hybrid inverters, battery ready
microinverters or optimisers, often used where shading is an issue
Battery storage
A battery does not increase how much your panels generate. Instead, it stores surplus electricity so you can use it later, typically in the evening.
Battery costs vary depending on:
storage capacity
power output
brand and warranty
system design, including whether you need a hybrid inverter
For some properties, adding a battery provides a strong improvement in savings. For others, solar PV alone may be the best first step.
Roof type, access and scaffolding
Installation costs are influenced by how easy it is to work safely and efficiently on your property.
This includes:
roof height and pitch
roof material such as slate, tile or metal
complexity, dormers, chimneys, multiple roof faces
access requirements and scaffolding
A professional quote should clearly state whether scaffolding is included and what type of access is required.
Electrical work and consumer unit upgrades
Some properties need additional electrical work to ensure the system is safe and compliant.
This may include:
isolator switches
upgrades to the consumer unit
additional cabling runs if the inverter location is far from the array
installation of monitoring equipment
A good installer will identify this during the survey so there are no surprises later.
DNO approvals and export limitation
Some systems require notifications or approvals for connection to the local network, especially larger systems or those with battery storage.
Your installer should manage:
any required notifications or applications
documentation and commissioning
export limitation controls if needed
This does not always add cost, but it can influence timelines and design choices.
Common mistakes that increase costs
Choosing a system size without considering usage patterns
Over sizing a battery that will not be used effectively
Ignoring shading and then paying later to retrofit optimisers
Not addressing roof condition first, leading to removal and refit costs
A proper survey and honest design discussion avoids most of these issues.
What should a solar quote include?
A clear solar quote should cover:
system size and expected generation estimate
panel brand and model
inverter and battery (if needed) specification
mounting system details
scaffolding and access
monitoring and app setup
warranties and workmanship guarantee
commissioning and handover documentation
any assumptions or exclusions
If a quote is missing detail, it is hard to compare properly.
How to compare solar panel quotes properly
When quotes vary, it is usually due to differences in:
system sizing and design assumptions
panel and inverter quality
battery inclusion and capacity
access and scaffolding requirements
monitoring and aftercare support
The best question to ask is not “which is cheapest”, it is:
“Which system design best matches how I use electricity, and which installer will support it long term.”
Frequently Asked Questions
Pricing moves with equipment costs and demand. The best approach is to focus on value, design quality and warranties rather than timing the market.
Not always. Batteries tend to provide the most value when evening usage is high, or where you want greater energy independence. Many people install solar first and add storage later.
It varies, but solar can improve running costs and energy efficiency, which many buyers see as a positive feature.
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