Is my UK roof suitable for solar panels?
The roof checks affecting solar design, cost, maintenance and safety, from structure and covering to shading and access.
Reviewed 2026-09-24 · 6 min read
Suitability is more than direction
South is not the only useful orientation. A survey should consider orientation, pitch, usable area, shading, roof obstructions and how generation matches demand. Roof age and condition matter because mounting hardware is intended to remain for years; installing over a covering needing replacement can create avoidable access and reinstatement costs.
Ask whether repairs or replacement should happen first, who decides and what is included. Flat roofs, fragile coverings, dormers, skylights and unusual construction can change the design.
The usable roof area is smaller than the outline seen from the street. Setbacks, valleys, hips, ridges, vents, rooflights and access paths can all reduce the panel layout. Ask to see a scaled plan and check that the proposed number of panels can physically fit without hiding important roof features.
Orientation and pitch are design inputs, not automatic pass or fail tests. An east-and-west arrangement may spread generation across more of the day, while a south-facing roof may produce a stronger midday peak. The useful choice depends on the property’s load, export arrangements, shading and available area.
Structure and access
Ask how rafter arrangement, fixing points, wind uplift, snow loading where relevant, covering, penetrations, cable routes and safe access will be assessed. A satellite view can support early design but cannot replace an appropriate site check for a complex building.
The design should address waterproofing, fire and maintenance access. Leasehold, listed or managed properties may need permissions; establish those before signing. Ask who will obtain any permission and what happens to the deposit if consent is refused.
Ask how installers will reach the roof during construction and later maintenance. Scaffolding, edge protection, roof ladders and lifting equipment may affect price and programme. Cable routes should be kept orderly, protected from damage and coordinated with existing services.
For a system on a garage, extension or outbuilding, confirm whether its structure and consumer unit are suitable. If the building has asbestos-containing materials, do not allow drilling or disturbance without specialist advice and an appropriate plan.
Shade and future changes
Shade varies by season and hour. Ask how trees, chimneys and buildings were modelled and request monthly output. Do not remove trees or alter a roof solely to fit a quote without independent advice. Compare that cost with the forecast benefit.
Ask whether the design uses a string inverter, optimisers or microinverters and why. Module-level equipment can be useful in some layouts, but it adds equipment and does not make a heavily shaded roof produce the same energy as an unshaded one. The installer should explain the trade-off in plain language.
Planning restrictions can depend on location and building type. Permitted development conditions, listed-building controls and conservation-area requirements are different questions from electrical safety. Check the relevant planning authority rather than assuming a system is automatically exempt.
Common questions
Does north-facing rule out solar?
Not automatically. Orientation, pitch, shading and economics should be assessed together.
Is a remote survey enough?
It can start design, but older, complex or commercial roofs need suitable site and structural checks.
Can an old roof take panels?
Possibly, after checking covering, structure, waterproofing and remaining life.