Low roof height does not settle roof suitability
Ask for output by roof face and the effect of nearby trees, which may shade a lower roof. Consider future roof maintenance before committing to equipment and ask how panels would be removed and refitted if necessary.
Build a roof and access record
For a bungalow, check whether nearby mature planting shades the lower roof at useful generating hours. A layout should also remain accessible for roof maintenance. Review roof condition and mounting checks.
Use measured electricity demand
Retirement or daytime occupancy can increase coincident demand, but occupancy is not a measurement of solar use. Enter actual household electricity kWh and test several direct-use shares in the savings calculator.
Ask for a complete proposal
The cash price should identify modules, inverter, mounting, access, electrical work and commissioning. Keep optional storage and backup separate so their additional return is visible. Read the installation scope and check a received quote.
Use a surveyed annual generation estimate for the actual layout, rather than treating a property-type example as a forecast. The payback model accepts that explicit generation and keeps bill reduction separate from exports.
Sources and review dates
Research-based guidance. Source checks do not imply product testing or verification of an individual installer.
- Energy Saving Trust: Solar panels. Solar suitability, generation, roof and installation considerations; not a local quote dataset. Scope: UK. Checked .
- Trinasolar: Vertex S+ NEG9RC.27. Example 450 W module format 1762 x 1134 x 30 mm; identify exact module revision on a quote. Scope: Product specification. Checked .
Registry sources-2026-11-01. Tariffs have a 30-day internal review interval. Methodology and assumptions.