A solar installation should begin with a clear view of the approvals required, not a last-minute scramble for paperwork. The solar permit approval process can sound more complicated than it is, particularly because there is no single UK “solar permit”. Instead, it is a series of checks covering planning, building safety and connection to the electricity network.
For most straightforward domestic roof installations, the process is manageable and often does not require a full planning application. Larger commercial systems, listed properties, battery storage and higher-export designs can need more preparation. The value of an experienced installer lies in identifying the right route early, designing around the requirements and keeping your project moving.
The solar permit approval process in the UK
A solar project usually needs to satisfy three separate authorities or requirements: the local planning authority, building regulations and the local Distribution Network Operator, known as the DNO. They look at different parts of the project.
Planning considers the appearance and position of the panels, especially where a building is listed, in a conservation area or subject to local restrictions. Building regulations focus on whether the roof, electrical work and wider installation are safe. The DNO assesses how the system will connect to the local electricity network and whether it can export power safely.
The order matters. A property survey and system design should happen before applications or notifications are submitted. This prevents avoidable delays, such as requesting network permission for an inverter size that later has to change because of roof constraints or a planning condition.
Planning permission: when is it needed?
Many rooftop solar panel systems on homes benefit from permitted development rights. In simple terms, this means planning permission may not be needed provided the installation meets the relevant limits and conditions. Panels should be positioned sensitively, should not protrude excessively from the roof and should be removed when no longer in use where reasonably practicable.
However, permitted development is not a universal green light. Listed buildings usually need listed building consent, and homes in conservation areas may face additional controls, particularly where equipment is visible from a highway. Flats, residential blocks and commercial premises can also have more complex ownership, leasehold or planning considerations. Ground-mounted arrays, car-port solar canopies and installations on heritage buildings should always be assessed individually.
Requirements vary across the UK, and local planning policies can add important detail. For London property owners, this is particularly relevant where architectural character, protected views or conservation designations apply. A well-prepared design considers panel layout, cable routes, inverter location and visibility before work is booked.
Building regulations and electrical safety
Solar PV is more than panels fixed to a roof. It is an electrical generation system connected to your property and, in most cases, the grid. The installation must be designed to protect occupants, the building and the people working on it.
Building regulations considerations can include roof loading, wind resistance, fire safety, access for maintenance, electrical isolation and compliant wiring. On commercial buildings, the roof structure and fire strategy deserve particular attention. A large array may be technically possible, but it still needs suitable structural capacity and safe routes for installation and future servicing.
Electrical work must also be correctly notified or certified under the applicable rules. Your installer should provide the relevant electrical certificates, commissioning records and system information once the work is complete. Keep these with your property documents. They are useful for insurance, future maintenance, a sale of the property and any later system expansion.
DNO approval and solar export
The DNO is responsible for the local cables and network equipment that connect your building to the electricity grid. Its role is not to sell you electricity or set your tariff. Its concern is whether your solar inverter and battery system can connect without creating safety or voltage issues on the local network.
For a standard small domestic system, the installer may be able to connect under the G98 process and notify the DNO after commissioning. Larger systems, systems with a higher export capacity, three-phase connections or more unusual configurations often require G99 approval before installation or connection. This distinction is crucial: do not assume that a larger inverter can simply be fitted and switched on.
Battery storage adds another consideration. A battery can increase how much solar power you use in the evening, reduce imports at expensive times and provide backup capability where a suitable design is specified. But the DNO will still consider the inverter’s export behaviour. In some cases, an export limitation scheme is agreed so the site can generate and store substantial energy without exceeding the export level the network can accept.
DNO timescales depend on the application type and local network conditions. Where reinforcement or further assessment is needed, the project may take longer or require design changes. It is better to know this at the design stage than after equipment has arrived on site.
Information needed for an approval submission
The paperwork should be handled as part of a coordinated project, but the quality of the information makes a real difference. A survey allows the design team to confirm the roof construction, meter arrangement, incoming supply, consumer unit capacity and proposed equipment locations.
For more involved applications, the supporting pack may include:
- a site plan and panel layout;
- inverter, battery and export-limitation specifications;
- single-line electrical diagrams and protection settings;
- structural information and, where required, fire-safety details.
Commercial sites may also need landlord consent, landlord-and-tenant coordination, a roof warranty review and a plan to minimise disruption to trading or residents. These are not always formal permit requirements, but they can stop a technically approved project from reaching installation smoothly.
A practical approval timeline
The fastest projects are not those that skip checks. They are the ones that organise the checks early. After the initial survey, the system is designed around your electricity use, roof space, budget and energy goals. A household that wants to run more appliances from stored solar after sunset may prioritise battery capacity. A business with strong daytime demand may gain more from maximising on-site solar generation and managing export.
The planning position is then confirmed. If an application or consent is needed, it should be submitted before installation is scheduled. In parallel, the installer establishes the appropriate DNO route and provides the technical information required. Once approvals are in place, equipment can be installed, tested and commissioned.
After commissioning, you should receive a clear handover covering system operation, monitoring access, warranties, certificates and maintenance recommendations. If you intend to receive payments for exported electricity, make sure you also understand the requirements of your chosen energy supplier. Network approval and an export tariff are related, but they are not the same thing.
Common causes of delay and how to avoid them
The most common issue is an incomplete early survey. An older consumer unit, limited roof access, an unsuitable inverter location or an undersized incoming supply can alter the design. None of these necessarily prevents solar, but discovering them late can affect programme and cost.
The second is treating planning as an afterthought. This is especially risky on listed buildings, properties in conservation areas and multi-occupancy sites. Early checks give the design team room to find a solution that protects both the building’s character and the project’s financial case.
Finally, do not size a system solely around the number of panels that fit. The best system balances generation, daytime consumption, battery use, export capacity and the available network connection. More capacity can deliver greater savings, but only when it is engineered to work well with the building and the grid.
A properly managed solar project turns approvals from an obstacle into a planned part of the journey. With a thorough survey, accurate design and direct coordination with the relevant bodies, you can move towards lower energy bills, cleaner on-site power and greater control over how your property uses electricity.
