Solar installations are appearing across Bristol’s rooftops, and mostly that’s good news. The bad news arrives a few years later, for the minority who put twenty-five years of panels on top of a roof with ten years of life left. Before any installer books a date, these are the roofing questions to settle.
The order of operations rule
Panels last 25–30 years and cost real money to remove and refit — typically well over a thousand pounds if roof work is needed underneath them later. So the rule is blunt: fix or replace the roof first, or confirm it genuinely has decades left. A proper inspection before committing to solar is the cheapest part of the whole project.
What to check on pitched roofs
Age and covering condition first: concrete tiles at 45 years old or original Victorian slate on iffy fixings are poor foundations for panel mounts. Then the structure: panels add load, and mounting rails concentrate it on specific rafters. Reputable solar firms assess this; the roof-trade reality is that some just install. If your roof timbers have any history of sag or repair, get an independent view.
Fixings are where leaks start
Every panel bracket penetrates or displaces the covering. Done properly — hooks under tiles, flashed correctly — it’s watertight for the duration. Done hastily, each bracket is a future drip. Ask the installer specifically how brackets are weatherproofed on your covering type; slate needs different detailing to concrete tile, and a surprising number of leaks we’re called to trace back to solar fixings.
Flat roofs: a different conversation
Ballasted frames on flat roofs avoid penetrations but add significant weight, and panel arrays create shaded, debris-trapping zones. On an ageing felt roof, that accelerates wear. If solar is part of your plan for an extension or garage, replacing tired felt with EPDM first makes the whole assembly coherent — the membrane will outlast the panels.
Access and the neighbours’ scaffolding
One practical Bristol note: if your terrace needs scaffolding for solar anyway, it’s the cheapest moment to do any roof repairs at the same time — the access cost is shared. We regularly coordinate with solar installers for exactly this reason.
Getting solar quotes? Book a roof check first — free, written up, and it might save you a four-figure refit bill in five years.