1-2 days
Typical installation time
4-8 weeks
Quote to switch-on
MCS
Certificate issued on completion
The Installation Process: Step by Step
A typical domestic solar installation follows this process from first contact to final paperwork.
Get Quotes
Request quotes from multiple MCS-certified installers. A good installer will visit your property for a site survey before providing a final quote.
Pre-Installation
Your installer handles scaffolding arrangements, DNO pre-notification, and any planning requirements. Most domestic installations fall under permitted development.
Installation Day
The installation team fits the mounting rails, panels, inverter, and wiring. A typical 3-4 kWp system takes one to two days for a team of two engineers.
Commissioning
The system is tested, the inverter is configured, and monitoring is set up. Your installer explains how to read your system output.
Post-Installation
Your installer submits the MCS certificate, notifies your Distribution Network Operator (DNO), and you can apply for the Smart Export Guarantee.
Pre-Installation Steps in Detail
The work done before your installation day is what ensures the job runs smoothly.
Site Survey
A qualified engineer assesses your roof structure, pitch, orientation, shading from trees or chimneys, and existing electrical setup.
Planning Permission
Most domestic solar installations are permitted development. Listed buildings, conservation areas, and larger commercial systems may need planning permission.
Structural Check
Older properties may need a structural engineer to confirm the roof can bear the additional load of solar panels (typically 10-15 kg/m2).
Scaffolding
Your installer arranges scaffolding, which is typically erected the day before or the morning of installation. Budget one to two weeks for scaffolding to be arranged.
DNO Pre-notification
For systems over 3.68 kW, your installer must notify your Distribution Network Operator before installation. This can take one to three weeks.
Metering
Discuss meter requirements with your installer. A smart meter or generation meter will be needed to record exported electricity for Smart Export Guarantee payments.
What Happens on Installation Day
Here is a typical schedule for a two-engineer team installing a 3-4 kWp system on a standard pitched roof.
| Time | Activity |
|---|---|
| Morning | Scaffolding final check, roof penetrations prepared, mounting rails fitted |
| Mid-morning | Solar panels fixed to rails, DC cables run to inverter location |
| Afternoon | Inverter installed, AC wiring connected to consumer unit |
| Late afternoon | System commissioned and tested, monitoring app set up, walkthrough with homeowner |
Timings vary depending on system size, roof complexity, and access. Your installer will give you a more precise schedule.
After Your Installation
MCS Certificate
Your MCS-certified installer registers the installation on the MCS database. You receive an MCS certificate within a few days of completion. Keep this document safe — it is required for Smart Export Guarantee applications, insurance claims, and when you sell your home. Read our MCS certification guide to understand what this certificate means.
DNO Notification
Your installer notifies your Distribution Network Operator (DNO) after completion. The DNO accepts the connection and sends a G98 or G99 acceptance letter, depending on your system size. Your installer should provide you with a copy of this acceptance.
Smart Export Guarantee
Once you have your MCS certificate, you can apply to an energy supplier for Smart Export Guarantee payments. Suppliers are obliged to offer a tariff if they have 250,000 or more customers. You will be paid for each unit of electricity you export to the grid. Rates vary between suppliers, so compare before applying.
Meter and Tariff Setup
A smart meter or generation meter records your exported electricity. If you do not already have a smart meter, contact your energy supplier after installation. Consider switching to a smart tariff such as Octopus Go or Intelligent to maximise savings alongside your solar system.
Home Insurance Notification
Notify your home insurance provider that you have solar panels. Most policies cover panels installed by a MCS-certified installer as a permanent fixture, but some insurers require a premium adjustment. Confirm your policy covers the system for accidental damage and storm damage. See our solar installer insurance guide for more detail.
When You May Need Planning Permission
Most residential solar installations are permitted development, but there are exceptions:
- Listed buildings require listed building consent
- Properties in designated areas such as National Parks may have restrictions
- Panels that project more than 200mm beyond the roof surface
- Ground-mounted systems may require planning permission
- Flat roofs in some conservation areas
Your installer should advise you before work begins. If in doubt, contact your local planning authority for a pre-application query.
How to Choose the Right Installer
The quality of your installation depends on the installer. Here are the key factors to evaluate.
MCS Certification
Essential. MCS certification is required to issue your certificate, which unlocks Smart Export Guarantee payments and maintains your home insurance cover.
Experience and Reviews
Look for installers with a track record of similar-sized domestic installations. Read independent reviews on Trustpilot or Which? Trusted Traders.
Detailed Written Quote
A good quote specifies the exact panel model, inverter, mounting system, and warranty terms. Avoid vague quotes that only list wattage.
Aftercare and Monitoring
Check what monitoring is included and how faults are handled. Reputable installers offer remote monitoring and prompt call-out response.
Questions to Ask Your Installer Before Signing
Before committing to an installer, ask these questions to ensure you are making an informed decision:
- Are you MCS-certified, and can I see your certificate number?
- What panel and inverter brands do you use, and why?
- What warranties come with the panels, inverter, and your own workmanship?
- Do you carry public liability and professional indemnity insurance?
- Who handles the DNO notification and MCS registration?
- What monitoring system is included, and how do I access it?
- What is your process if something goes wrong after installation?
Understanding Your Quote
A professional quote should include a full breakdown of components and costs. Watch out for vague quotes that describe the system only in kilowatt-peak (kWp) without specifying the exact panel model and quantity.
Compare at least three quotes before deciding. A lower price is not always better — a cheaper installation using lower-grade panels or a cut-price inverter may cost more in the long run through reduced output and higher maintenance costs.
What the MCS Certificate Means for You
When your installer is MCS-certified and registers your installation on the MCS database, you receive a certificate that:
- Proves the installation meets quality and safety standards in the UK
- Is required to apply for the Smart Export Guarantee
- May be required by your home insurer to confirm coverage
- Adds verifiable evidence of a quality installation when selling your home
- Gives you access to the MCS Consumer Code dispute resolution process
Learn more in our detailed MCS certification guide.
How Long Does the Whole Process Take?
From your first quote request to having a working, certified system, expect four to eight weeks in most cases. The main variables are:
- Installer availability: Popular installers can be booked several weeks in advance
- DNO notification period: For systems over 3.68 kW, the DNO has up to 28 days to respond
- Scaffolding lead times: These can add one to two weeks depending on availability in your area
- Weather: Roof work is weather dependent and may be rescheduled
Warranties to Expect After Installation
A complete installation should come with three types of warranty coverage. Read our full solar warranties guide for more detail. In summary:
- Panel product warranty: Typically 10-25 years against manufacturing defects
- Panel performance warranty: Typically 25-30 years guaranteeing a minimum output level
- Workmanship warranty: Covers the installer's work for typically 2-10 years
Get Free Solar Quotes
Compare prices from MCS-certified installers in the UK. Free, no-obligation quotes tailored to your home.