A solar project can look simple from the ground: panels on the roof, an inverter on the wall and lower reliance on grid electricity. In practice, the solar permits required depend on the building, the size of the system, its location and the way it connects to the electricity network. Getting this stage right protects your investment, prevents avoidable delays and ensures the system is safe to operate for years to come.
For many homes, the permissions process is straightforward. For commercial sites, flats, listed properties and larger battery-backed systems, more checks may be needed. A professional installer should identify these requirements before work is booked, rather than discovering them once equipment has arrived on site.
Which solar permits are required for your property?
“Permits” is a useful catch-all term, but solar projects in the UK usually involve three separate areas: planning permission, Building Regulations compliance and approval or notification to the local electricity network operator. They are not interchangeable.
Planning considers how the installation affects the appearance and setting of a building. Building Regulations cover structural and electrical safety. The Distribution Network Operator, or DNO, manages the local electricity network and needs to know how your generation and battery equipment will export power to it.
The rules also differ across the UK. This guide focuses mainly on the process property owners are likely to encounter in England, including London. Your installer should confirm the precise requirements for your local authority, building type and network area.
Planning permission and permitted development
Most domestic roof-mounted solar panel installations in England can be installed under permitted development rights, meaning a full planning application is not normally needed. That does not mean there are no conditions. Panels should generally be positioned to minimise their effect on the building’s external appearance and the area around it, and equipment should not project excessively from the roof surface.
Planning permission is more likely to be required when a property is listed, in a conservation area, subject to a planning condition or covered by an Article 4 direction that limits permitted development rights. Ground-mounted arrays, particularly larger installations, can also require formal planning consent. If panels are proposed on a flat roof, a prominent façade or an outbuilding close to a boundary, the design deserves careful review before assuming it is permitted.
Commercial premises need the same early assessment, but the questions can be wider. A warehouse roof may be visually unobtrusive yet still need consideration of plant screening, roof alterations, neighbouring properties and any conditions attached to the original planning permission. For hospitality, retail and food-production sites, it is also sensible to plan installation work around trading hours and site access.
Listed buildings, conservation areas and shared ownership
Listed buildings require particular care. Consent may be needed for work that affects the building’s character, even where panels are not readily visible from the street. Local authorities will often consider the panel layout, cable routes, inverter location and whether the installation can be reversed without undue damage to historic fabric.
A conservation area does not automatically stop a solar installation, but it changes the conversation. Visibility, roofline design and the position of associated equipment matter. Early consultation is far less costly than redesigning a system after an application has been submitted.
For flats, residential blocks and leasehold homes, permission from a freeholder, managing agent or other relevant owner can be just as important as statutory consent. The roof is often a shared asset, and the route for cables, meters and fire-safety equipment may pass through communal areas. Landlords and developers should establish responsibility for approval, future maintenance and system ownership before design is finalised.
Building Regulations for solar installations
Solar panels add weight to a roof and create new electrical connections. Building Regulations are therefore central to a properly delivered project, even where planning permission is not needed.
The installer must assess whether the roof structure can safely support the panels, mounting system and the wind and snow loads that act on them. Older properties, roofs with existing defects and commercial roofs with lightweight construction may need a more detailed structural review. Waterproofing is equally important. A well-designed mounting system should protect the roof covering, not compromise it.
Electrical work must be designed and installed safely, with suitable isolation, protection and labelling. The inverter, battery and cabling must be located appropriately for the property and accessible for inspection and maintenance. Battery storage introduces additional design decisions around ventilation, clearances, fire considerations and the suitability of the chosen location.
In many cases, a suitably registered competent person can self-certify the work and provide the relevant compliance certificate after installation. Where this route is not available, Building Control may need to be involved. Either way, keep the completion documents with your system information. They can be useful when selling, refinancing, insuring or maintaining the property.
DNO approval: the step that protects the local grid
Your solar array is connected to your building, but it also interacts with the public electricity network. On bright days, unused generation can be exported beyond your meter. The DNO needs to ensure this export will not affect local network safety or voltage quality.
For smaller installations, the process is often a G98 notification. This commonly applies where the inverter’s export capacity is within the relevant small-scale threshold, typically up to 16 amps per phase. The installation can usually proceed before the notification is submitted, provided the equipment and installation meet the applicable requirements. The installer then notifies the DNO after commissioning.
Larger systems generally need a G99 application and approval before installation. This is common for bigger homes with substantial arrays, three-phase properties, commercial buildings and projects that combine solar with higher-capacity battery storage. The DNO may approve the proposal as submitted, request technical information or specify network works and costs where local capacity is constrained.
The key point is that panel size alone does not determine the route. Inverter export capacity, phase arrangement, existing generation and battery operating settings all matter. Export-limiting equipment can sometimes enable a project where unrestricted export would not be accepted, but it must be correctly designed, tested and documented.
Why batteries and EV chargers need to be considered together
A battery can make solar more valuable by storing daytime generation for use in the evening, when a home or business may otherwise buy electricity from the grid. It can also change the way a site imports and exports power.
If a battery is added later, its control settings and export capability still need to be checked against the original DNO approval. The same applies when adding an EV charger, heat pump or further solar panels. These technologies can work very well together, but the electrical design should consider the property as a whole rather than treating each upgrade as a separate job.
For commercial customers, this joined-up approach is especially valuable. A system may need to prioritise on-site demand, manage peak loads, protect operational equipment and provide clear performance reporting. Designing with the future in mind can avoid paying for repeat surveys, altered cabling or another network application shortly after the first project is completed.
A practical permissions timeline
The smoothest projects deal with permissions alongside system design. At the survey stage, an installer should review the roof, electrical supply, meter arrangement, proposed equipment locations and any planning constraints. For businesses, this is also the point to identify landlord approvals, access restrictions, asbestos procedures, fire requirements and operational considerations.
The next step is to produce a design that reflects those findings. If planning consent, listed building consent or DNO pre-approval is required, these should be progressed before installation dates are fixed. Some approvals are quick; others depend on the local authority or network operator and can take longer. It is better to be realistic about timing than to promise an installation date that cannot be met.
Once work is complete, commissioning records, electrical certificates, DNO paperwork and warranty information should be handed over in an organised pack. Monitoring should then confirm that the system is producing as expected and help spot issues early.
The value of a managed solar process
Permissions should not become a reason to put solar on hold. They are simply part of delivering a system that is legal, safe and engineered for the building it serves. The right team translates technical requirements into a clear plan, keeps you informed and handles the detail without losing sight of your energy goals.
Shard Solar assesses the property, system design and connection requirements as part of a managed project, helping homeowners and businesses move from first survey to commissioned generation with fewer surprises. A well-prepared application and carefully designed installation do more than satisfy paperwork – they give your solar and battery system the best foundation to generate, store and save over the long term.
