Solar Panel Installation Survey: What to Expect UK
Check Your Eligibility for Boiler Upgrade Scheme (BUS)
Complete your details below to check your eligibility.
Thank you
We've received your details and will be in touch shortly.
Quick answer: what happens during a solar panel installation survey?
During a solar panel installation survey, a surveyor assesses the roof, usable area, orientation, pitch, shading, roof covering, structural suitability, access and likely panel layout. They also review the electricity supply, consumer unit, meter position, earthing, cable routes and suitable locations for the inverter and any battery.
Your energy use and future plans, such as an EV or heat pump, may also be discussed. The findings should feed into the final system design, generation estimate, installation method, DNO process and quotation.
A remote assessment can be useful early on, but site-specific issues may still need confirming before installation. Current MCS guidance specifically recognises the limitations of remote evaluation.
Solar Panel Installation Survey: What Happens Before Your UK Solar Installation?
A solar panel installation survey turns an initial estimate into a property-specific solar design. It checks whether your roof is suitable, how many panels can realistically fit, how shading may affect output, whether the electrical setup is ready, and where equipment and cables can go.
Satellite imagery and online calculators cannot reveal every issue. Roof condition, unusual structures, awkward access, hidden shading and electrical upgrades can all change the final design or price. By the end of a good survey, you should have a clearer panel layout, realistic generation estimate and written installation scope.
If you are still comparing options, Get Free Quote can help you understand the wider process, while its solar panel quote comparison service lets you compare installation proposals before deciding whether to proceed.
Compare solar panel quotes based on the actual survey findings, not just the headline price.
What does a solar panel installation survey check?
| Survey area | What is checked | Why it matters |
|---|---|---|
| Roof | Condition, covering, pitch, orientation, usable area and structure | Confirms whether panels can be fixed safely and where they can go |
| Shading | Trees, chimneys, dormers and neighbouring buildings | Affects estimated annual generation and panel layout |
| Electrics | Consumer unit, supply, meter, earthing and cable routes | Identifies connection requirements and possible upgrades |
| Equipment | Inverter, isolators and battery where relevant | Helps keep cable runs practical and equipment accessible |
| Access | Scaffolding position, roof access and obstacles | Affects installation method, safety and cost |
| Household needs | Electricity use and future EV, battery or heat pump | Avoids designing solely around today's electricity demand |
Desktop survey or on-site survey?
Desktop design is useful for early-stage quoting. Satellite imagery and design software can estimate roof dimensions, direction and possible panel positions. However, it remains an estimate.
The current MCS MIS 3002 Solar PV Standard says drawings, maps or photographs can be used to determine inclination and orientation. However, accurate estimation of shading will typically require a site visit. Where a site has been evaluated remotely, customers must also be made aware when site conditions could materially alter the estimated performance.
| Desktop assessment | On-site assessment |
|---|---|
| Useful for feasibility and indicative pricing | Confirms physical conditions at the property |
| Can estimate roof geometry and layout | Checks roof covering, structure, access and obstructions |
| May model shading remotely | Can identify site-specific shading |
| Cannot always confirm cable routes or electrics | Can inspect the consumer unit, meter area and cable path |
A remote quote is not automatically a problem. The key question is what remains estimated and what will be confirmed before the design and price become final.
Visual suggestion: side-by-side graphic showing a desktop satellite design and the information added during an on-site solar survey.
1. Roof condition and structural suitability
The survey should identify the roof covering, visible defects, available fixing points and signs that repair may be needed before solar is installed.
Slate, plain tiles, concrete tiles, metal roofs and flat roofs can require different mounting methods.
Under MCS MIS 3002 Issue 6.0, the roof structure must be checked by a suitably competent person to ensure it can withstand the loads imposed by the solar PV system. Where the structure is unusual or there is doubt about its suitability, MCS says a qualified structural engineer should be consulted. Examples include structural distress, previous alterations, shallow pitches and certain roofs with hips or valleys. MCS Certified
That does not mean every home automatically needs a separate structural engineer’s report. The level of assessment depends on the roof.
For flat roofs, the design questions are different. The Get Free Quote guide to solar panels on flat roofs can cover those issues in more detail without duplicating them here.
2. Roof measurements, orientation and shading
The surveyor should confirm the usable roof area, not simply the total roof dimensions.
Chimneys, roof windows, vents, dormers and edge zones can reduce the space available. MCS also places specific requirements around panels fitted near domestic roof edges because wind uplift and other factors can become more significant. MCS Certified
The Energy Saving Trust solar guidance notes that an unshaded south-facing roof is ideal, but east- and west-facing roofs can also work. Shading from trees, buildings or chimneys may substantially affect performance. Energy Saving Trust
Trees and buildings can also create different shadows throughout the day and year. MCS therefore incorporates a shade factor into its standard generation calculation. Where shading is present, it should be reflected in the estimate supplied to the customer. MCS Certified
If two installers predict very different annual generation from similar systems, compare their orientation, pitch and shading assumptions rather than automatically accepting the larger figure.
Visual suggestion: sun-path diagram showing seasonal shade from a chimney, tree and neighbouring property.
3. Electrical checks and cable routes
Solar is both a roofing project and an electrical installation.
The survey should consider the consumer unit, incoming electricity supply, meter position, earthing and the likely route between the panels, inverter and electrical connection point. MCS also requires the applicable G98 or G99 grid-connection procedures to be followed. MCS Certified
Cable routing is easy to overlook during an initial quotation. However, it can affect appearance, installation time and whether additional work is required.
Agree where visible cables and equipment will go before installation starts.
For the stages that follow the survey, use the dedicated solar panel installation process guide rather than turning this article into another step-by-step installation page.
4. Inverter, battery and future electricity demand
The survey is also the right time to discuss where the inverter will go and, if storage is being considered, where a battery could be installed.
Tell the surveyor about planned changes such as:
- an EV charger
- a heat pump
- battery storage
- an extension
- working from home more often
- other major electrical loads
Current electricity consumption is useful, but a system should not be designed around today’s usage if you already know your demand will change materially.
Panel choice can also affect how much capacity fits on a restricted roof. Where space is tight, compare physical dimensions and efficiency using the best solar panels UK guide rather than assuming every panel creates the same possible layout.
5. Planning, grid connection and installation access
Planning rules differ across the UK, so the property’s location matters.
In England, domestic rooftop solar often qualifies as permitted development when the relevant conditions are met. However, additional restrictions can apply to listed buildings, conservation areas and other designated locations.
Importantly, the Planning Portal’s current domestic solar guidance confirms that England’s permitted-development rules were updated on 27 August 2026, with a 12-month transitional period running to 27 August 2027. Planning Portal
The survey should also identify the relevant Distribution Network Operator process. Energy Saving Trust states that home solar installations must be registered with the DNO and that the installer will usually handle this. Energy Saving Trust
Finally, access matters. Scaffolding position, delivery space, conservatories, extensions, narrow passages and other obstacles can affect the installation method and final quotation.
How to prepare for a solar panel survey
Have recent electricity bills or annual consumption figures available. Tell the surveyor about future EV, heat-pump or battery plans.
Mention any known roof leaks, previous structural work, roof repairs or remaining roof-covering warranty.
It is also worth deciding where you would prefer visible equipment and cables to go. Your preferred position may not always be technically suitable, but discussing it before the design is finalised is much easier than changing it on installation day.
Useful questions to ask include:
- Which parts of this design are still provisional?
- How has the roof structure been assessed?
- How was shading calculated?
- Could the price change following this survey?
- Who manages the DNO process?
- Is scaffolding included?
- Are electrical upgrades included?
- Does any roof work need completing first?
What should you receive after the survey?
A useful survey should lead to a written proposal specific enough to compare with another installer.
Look for the proposed:
- system capacity in kWp
- number and model of panels
- roof layout
- inverter specification
- estimated annual generation
- shading assumptions
- battery specification, if applicable
- mounting method
- electrical work
- scaffolding arrangements
- exclusions and possible additional costs
Get Free Quote’s current solar quote guidance similarly recommends comparing equipment, generation assumptions, scaffolding, mounting, electrical work, DNO responsibilities and warranties instead of focusing on headline price alone. getfreequote.co.uk
If the survey changes assumptions used for the original quote, request the revised design and price in writing before committing.
Common problems a good survey can uncover
A detailed survey may identify damaged roof coverings, fewer usable panel positions than expected, significant seasonal shading, awkward cable routes, unsuitable equipment locations, electrical upgrade requirements or more complicated scaffolding.
Recent UK homeowner discussions illustrate why this matters. Some customers report reaching installation day before problems with roof coverings or proposed layouts were identified. These accounts are anecdotal rather than controlled evidence, but they highlight the practical consequences of relying too heavily on an initial remote assessment.
Get Your Free Air Source Heat Pump Quote
Find the right air source heat pump solution for your home. Tell us a few details and our team will help you explore suitable options at a competitive price.
Quick to complete. No obligation.
Get your quote
Enter your details below and one of our team will get back to you.
Frequently asked questions
Find clear answers to common questions comparing air source and ground source heat pumps, including efficiency, installation and running costs, winter performance, noise, land requirements and borehole depth.
A property-specific assessment is important before the installation design is finalised. MCS allows some information to be gathered remotely, but roof structure and other site-specific factors still need appropriate assessment. MCS Certified
Yes. Remote tools can support an initial design and quotation. However, MCS requires customers to be informed where estimated orientation, inclination or shading could make actual performance different. MCS Certified
There is no universal survey duration. A straightforward domestic assessment may take around an hour or two, while complex roofs, battery projects or unusual electrical arrangements can take longer. Some UK installers explicitly allow up to two hours for a detailed residential survey. ChargedEV
There is no standard UK charging model. Some installers include surveys within their quotation process, while others charge a survey fee or refund it if the installation proceeds. Independent technical surveys may also be charged separately. Vertex Renewable Energy Surveys
They may need loft access where it helps establish the roof construction, condition or suitability. The exact inspection depends on the property and proposed mounting system.
No. MCS requires the roof to be checked by a suitably competent person. A qualified structural engineer is required where the roof is unusual or there is doubt about structural suitability. MCS Certified
Yes. Flat roofs can require different checks for fixing methods, wind loading, ballast and structural capacity. MCS gives separate requirements for mechanically fixed and ballasted systems. MCS Certified
It should form part of the performance assessment. MCS says accurate estimation of shade effects will typically require a site visit and includes a shade factor in its standard calculation. MCS Certified
Yes. Energy Saving Trust says east- and west-facing roofs can work, although their annual output will normally be lower than an equivalent unshaded south-facing system. Energy Saving Trust
The electrical installation needs to be considered when planning solar PV. A technical survey commonly checks the consumer unit, supply, meter arrangements, earthing and practical connection route.
The installer normally handles the relevant Distribution Network Operator registration or application. Energy Saving Trust confirms that solar systems must be registered with the DNO. Energy Saving Trust
Not always. In England, many domestic installations qualify as permitted development when all conditions are met. Rules and exceptions differ across the UK, particularly for listed buildings and designated areas. Planning Portal
Yes. Even if the battery will be added later, discussing it can help with inverter choice, electrical design, equipment positioning and future cable routes.
You should expect enough information to understand the proposed system, including layout, system capacity, major equipment, estimated generation, important assumptions and the work included in the quotation.
Ask the installer for the revised layout, performance estimate, specification and price in writing. MCS requires relevant site-based variations discovered after remote assessment to be notified to the customer and dealt with appropriately.
Conclusion
A solar panel installation survey should test the assumptions behind the initial quotation and turn them into an installable design.
The strongest survey connects roof condition, structural suitability, shading, electrics, cable routes, access and household energy requirements into one clear proposal.
Remote tools are valuable for initial estimates. However, unresolved site conditions should be identified and checked before the final design is agreed.
When comparing quotations, ask each provider three simple questions: What has the survey confirmed? What remains provisional? What is included in the final price?
