Leaking Conservatory Roof: Should You Repair or Replace? (2026 Guide)

A leaking conservatory roof is stressful — but it doesn't always mean a full replacement. Here's how to work out whether a targeted repair will hold, or whether you'll be throwing good money after bad. We'll cover diagnosis, costs, and the moment when repair becomes false economy.

Common causes of conservatory roof leaks

• Failed lead flashing where the conservatory meets the house wall
• Perished rubber gaskets on glass roof panels
• Cracked or lifted polycarbonate sheets
• Blocked or sagging gutters overflowing back into the structure
• Failed sealant around bars, ridges and box gutters
• Movement in the existing roof bars over many years
• Missing or displaced end caps on glazing bars
• Box gutter failure where the conservatory meets the main roof

Repair or replace — quick reference

When a repair is the right call

Repair makes sense when:

• The leak is from one identifiable spot (a flashing, a single seal)
• The rest of the roof is sound and the room is still comfortable
• The roof is under 10 years old
• You've had no previous leaks in different spots
• The polycarbonate or glass itself is still in good condition

We carry out targeted repairs across Plymouth, Plympton, Plymstock and the wider Devon and Cornwall area. Most repairs are done in a single visit and come with a workmanship warranty.

When replacement is the smarter long-term move

Replacement usually wins when:

• You've already paid for repairs and new leaks keep appearing
• The roof is 15+ years old
• Polycarbonate is yellowed, cracked or sagging
• The room is also too hot/cold/condensating — the leak is just one symptom
• You're planning to stay in the house long-term

If replacement is the answer, our insulated tiled roof and warm roof systems both eliminate leaks permanently. See typical replacement costs here.

The hidden cost of "just patch it"

We've been called to roofs that have been "repaired" four or five times. By the time the homeowner finally replaces it, they've often spent more on patching than the new roof would have cost — and they've put up with leaks (and the resulting damp, mould and damaged plaster) for years in the meantime. Persistent leaks rot timber wall plates, damage internal plaster and can short out conservatory electrics. The longer it's left, the bigger the eventual bill becomes.

Diagnosing the leak — what we look for at the survey

When we come out for a free leak survey, we check:

1. The lead flashing where the conservatory meets the house wall (most common single leak point)
2. All ridge joints, hip junctions and end-caps
3. The condition of the rubber gaskets on every glass panel
4. The polycarbonate panels for cracking, sagging or UV damage
5. The gutters and downpipes for blockages and back-flow
6. The wall plate and internal timbers for water damage
7. The frames and base for movement or rot

You get an honest verdict the same day, with photos of anything we've found, and a written quote within 48 hours.

Common mistakes to avoid

• Letting it drip while you decide. Every week of leaking damages timber, plaster and electrics. Even if you're going to replace, get the worst leak temporarily sealed.
• Paying for repair after repair. Two failed repairs almost always means the roof itself is end of life. The third “fix” rarely holds.
• Assuming condensation is a leak. Cold-weather drips that appear without rain are usually condensation. The fix for that is insulation, not sealant.
• Ignoring blocked gutters. Many "leaks" are simply gutters overflowing back into the conservatory. A 30-minute clean can fix it for free.

Get an honest assessment first

Our surveys are free across Plymouth, Devon and Cornwall, and we'll tell you straight whether a repair is worth doing or whether a new roof is the better option. We do both, so we have no incentive to push you either way. If a £200 flashing job will fix it, we'll say so. Request a free survey.