Solar Panel Installation, Step by Step: What UK Homeowners Need to Know
Everything you need to know about solar panel installation: how to plan your roof survey, check your installer, and get paid for spare power.
In short
- Check your installer holds a valid MCS certificate, only MCS-certified installations qualify for Smart Export Guarantee payments.
- Residential solar installation is zero-rated at 0% VAT to 31 March 2027, reducing the net cost on a typical £5,000 to £10,000 system.
- On our calculation, a 4 kWp south-facing roof is worth around £523 to £603 a year in bill savings and SEG export payments and an east-facing roof £435 to £495, if you buy your electricity from the supplier paying 12p per kWh for exports; at an open rate of about 4p, south-facing is worth around £299 to £333.
- Panel warranties vary by manufacturer; most inverters have a warranty of at least five years, which can often be extended, and inverter replacement is the most common long-term cost.
- On our calculation, payback runs about 11 to 16 years on a south-facing roof with a 12p export rate from your own supplier, or about 20 to 28 years at an open rate of about 4p; east-facing, shaded or battery-paired systems may take longer.
Why so many UK homes are going solar right now
The numbers tell a clear story. According to The Guardian (2026), 142,536 solar installations were added in Great Britain in just the first half of 2026, approaching the previous half-year record of 167,316 set in 2011. E.ON Next reported a 151% rise in customers installing solar panels over the same period.
High energy prices and a temporary VAT relief are the main drivers. Residential solar installation is currently zero-rated for VAT at 0% (zero-rated to 31 March 2027), which removes a meaningful slice of upfront cost on a typical system priced at £5,000 to £10,000 (Energy Saving Trust, Jul 2026).
For most households the appeal is straightforward: cut what you buy from the grid, earn a payment for what you export, and lock in a system that carries a long warranty. Understanding how the installation process works helps you ask the right questions before you commit.
People want to engage with their energy use, take control of their bills and rely less on the grid, and solar gives them a practical way to do that,
Is your roof ready for solar panels?
The survey stage begins with your roof, and four factors shape the outcome: orientation, pitch, shading and age. A south-facing roof at a pitch of 30 to 40 degrees captures the most energy across the year. East- or west-facing roofs still work, but the annual benefit is lower. On our calculation, a 4 kWp system without a battery is worth around £523 to £603 a year on a south-facing roof and £435 to £495 east-facing, if you also buy your electricity from the supplier that pays 12p per kWh for exports; at an open export rate of about 4p, a south-facing roof is worth around £299 to £333 (household using 2,500 kWh a year).
Shading from chimneys, trees or neighbouring buildings cuts output, sometimes significantly. A good installer will model shading across different times of day and seasons rather than simply eyeballing the roof.
Roof age matters too. If your tiles or felt are within five years of needing replacement, it is worth doing that work before panels go on, since removing and refitting a system adds cost. The surveyor will flag any structural concerns at this stage.
MCS accreditation and why it matters
MCS stands for Microgeneration Certification Scheme, the UK's quality standard for small-scale renewable energy. An MCS-certified installer has demonstrated competence, carries the right insurances and follows a defined installation code of practice.
Certification matters for two practical reasons. First, only an installation certified under MCS or an equivalent scheme qualifies for Smart Export Guarantee (SEG) payments. Under the SEG, electricity suppliers with at least 150,000 domestic customers must offer an export tariff; the rate is supplier-set and must always be above zero, so comparing tariffs across suppliers is worthwhile. Second, getting at least three quotes from certified installers before committing lets you compare prices and proposed system designs on equal terms.
Always ask to see an installer's MCS certificate number before signing a contract. You can verify it on the MCS website.
Most homeowners cite lower bills as the reason to go solar
Share of survey respondents giving each reason for going solar
| Lower energy bills | 71% |
|---|---|
| Worried about trustworthiness | 61% |
Concern about the trustworthiness of quotes is also high, making MCS accreditation a reassuring safeguard when choosing an installer.
energysavingtrust.org.uk - What do people think about solar power?
Permitted development, planning permission and building rules
Most domestic rooftop solar installations in England fall under permitted development rights, meaning no formal planning application is needed. The Government's General Permitted Development Order (GPDO) sets the conditions: panels must not protrude more than 200mm beyond the roof plane and must not be installed above the highest part of the roof (excluding chimneys).
Permitted development does not apply in every case. If your home is a listed building, or sits in a conservation area, you will need to apply for planning permission from your local authority before work begins. Some local authorities also have specific aesthetic rules about panel colour or positioning. Ground-mounted systems and frame-mounted installations frequently need permission regardless of location.
Your installer should confirm the planning position for your specific property at the survey stage, and should handle or advise on any notifications required.
Permitted development versus full planning: key conditions differ
Domestic rooftop solar in England
DNO notification and the grid connection
Before your panels are switched on, your installer must notify your Distribution Network Operator (DNO), the company responsible for the local electricity network. For systems up to 3.68kW single-phase, most DNOs operate a simple notification process rather than a full application, and the work can usually proceed without waiting for a formal approval. Larger systems, or those connecting to a three-phase supply, may require an G98 or G99 application and a longer lead time.
The DNO notification is part of what your MCS-certified installer handles as standard. It protects the safety of the grid and ensures your system is registered correctly for export purposes. Without it, your SEG application will not be accepted by your chosen electricity supplier.
Once notification is confirmed and the installation is complete, your installer will provide you with an MCS certificate for the system. You will need this document when you apply for a SEG tariff.
Battery storage: when does it improve the numbers?
A battery stores surplus solar generation that would otherwise be exported, letting you use it in the evening when the panels are idle. The financial case is strongest when you consume a lot of electricity outside daylight hours, or when your SEG export rate is low relative to your import tariff.
The battery case is weaker if you are at home during the day and already using most of what your panels produce, or if your roof is shaded and total generation is modest. A battery also adds to the upfront cost, so the payback calculation changes. On our calculation, panels without a battery pay back in about 11 to 16 years on a south-facing roof if you also buy your electricity from the supplier that pays 12p per kWh for exports, or about 20 to 28 years at an open export rate of about 4p; adding a battery typically extends the payback unless your evening consumption is high enough to offset the extra cost.
Ask each installer to model your system with and without storage, using your actual consumption data, so you can make a direct comparison.
Maintenance, warranties and long-term performance
Solar panels are low-maintenance by design, with no moving parts. An annual visual check for dirt, debris or physical damage is usually sufficient, along with monitoring your inverter's output data to catch any drop in performance early.
Panel warranties vary by manufacturer and usually cover product defects and a minimum output level; check the term and the output floor on each quote. Most inverters have a warranty of at least five years, which can often be extended, according to the Energy Saving Trust, and inverter replacement is the most common maintenance cost over a system's life. Check what your installer's workmanship warranty covers and for how long, as this is separate from the product warranty.
Home insurance policies vary in how they treat solar panels. Inform your insurer before installation, and confirm the panels are covered under your buildings policy. Some insurers include them automatically; others require a policy extension.
The solar installation process, step by step
- Request quotes from certified installersContact several MCS-certified installers and ask each for a written proposal based on your home's details. Getting at least three quotes lets you compare system sizes, equipment brands and prices on equal terms.
- Roof and home surveyA qualified surveyor visits to assess roof orientation, pitch, shading, structural condition and your current electricity consumption. This survey determines the system size that suits your home and flags any remedial roofwork needed before installation.
- Design, proposal and contractThe installer produces a system design showing panel layout, inverter choice and estimated output. Review the proposed warranty terms, workmanship guarantee and what happens if output falls short before you sign.
- DNO notification or applicationYour installer notifies your Distribution Network Operator before work begins. For most domestic systems this is a straightforward G98 notification; larger or three-phase systems may need a G99 application with a longer lead time.
- Installation dayA certified team fits the mounting system, panels and inverter, typically completing a standard domestic installation in one to two days. The system is wired, tested and the inverter commissioned before the team leaves.
- MCS certificate and SEG registrationYour installer issues an MCS certificate for the completed system. Use this certificate to apply to your preferred electricity supplier for a Smart Export Guarantee tariff, so you are paid for any surplus power you export.
Five Things to Check Before You Sign
- Confirm the installer's MCS certificate number is current and matches the company name on your contract.
- Check whether your property needs planning permission, listed buildings, conservation areas and ground-mounted systems are not covered by permitted development rights.
- Ask whether the system size is based on your actual annual consumption data, not a generic estimate.
- Make sure the quote lists all costs: scaffolding, DNO application fees and any roof repairs, so nothing is added on the day.
- Check that your buildings insurance will cover the panels once they are fitted, and that the workmanship warranty is stated separately from the panel and inverter product warranties.
Common mistakes to avoid
- Choosing on price aloneThe cheapest quote may use lower-grade equipment or skip detailed shading analysis. Compare proposals on system design, component warranties and MCS certification, not just the headline figure.
- Skipping the DNO notificationFailing to notify your Distribution Network Operator before switch-on means your system is not registered for export, which blocks SEG applications and may void your installer's workmanship warranty. Confirm your installer handles this before work starts.
- Ignoring roof conditionFitting panels to a roof that needs work within the next few years means paying to remove and refit the system later. Have the roof assessed honestly at survey stage and factor in any remedial costs.
- Not comparing SEG tariffsExport rates are supplier-set and vary widely; the obligation is only that the rate is above zero. Checking the current rates from several SEG-licensed suppliers after installation can meaningfully improve your long-term return.
Get quotes from certified installers
Fill out one short form about your home and energy use, and MCS-certified installers will contact you with personal quotes tailored to your roof and consumption.
Frequently asked questions
Answers to the most common questions.
Do I need planning permission for solar panels in the UK?
Most domestic rooftop installations in England fall under permitted development rights and need no planning application. Exceptions include listed buildings, conservation areas and ground-mounted systems, which usually require permission from your local authority. Your installer should confirm the position for your property at the survey stage.
What does MCS certification mean for my installation?
MCS (Microgeneration Certification Scheme) is the UK quality standard for small-scale renewables. An MCS-certified installation is required to qualify for Smart Export Guarantee payments, and it confirms your installer has met defined competence and insurance requirements. Always verify an installer's MCS certificate number before signing a contract.
How long does a solar panel installation take?
The physical installation typically takes one to two days for a standard domestic system, once surveys, DNO notification and any necessary permissions are in place. The full process from initial survey to switch-on, including DNO paperwork and MCS certification, usually takes several weeks in total.
What is the Smart Export Guarantee and how do I apply?
The Smart Export Guarantee (SEG) requires electricity suppliers with at least 150,000 domestic customers to pay you for surplus power you export to the grid. Rates are supplier-set and vary, so it is worth comparing tariffs. You apply directly to your chosen supplier after installation, using your MCS certificate as proof of eligibility.
How much does solar panel installation cost in the UK?
A typical domestic system costs £5,000 to £10,000 installed (Energy Saving Trust, Jul 2026), before any applicable support. The exact figure depends on system size, roof complexity and the equipment specified. VAT is zero-rated at 0% on residential installations to 31 March 2027, which reduces the net cost compared with a standard 20% VAT rate.
Can I install solar panels myself?
DIY installation is possible in theory but carries significant practical risks: working at height, electrical sign-off requirements and, critically, the loss of MCS certification. Without MCS accreditation you cannot access Smart Export Guarantee payments. Most mortgage lenders and insurers also expect a certified installation, so a professional installer is strongly advisable.