Roof Repairs UK helps you compare free, no-obligation quotes from local specialists for polycarbonate roof repairs, including:
- Leaking polycarbonate roof repairs (drips through joins, end caps, bars)
- Cracked or broken sheet replacement
- Fixing and washer replacement to stop movement and leaks
- Seal and gasket repairs on glazing bars
- Repairs after storm damage (lifted sheets, blown-out fixings)
- Improvements to drainage and guttering to reduce overflow
Describe your polycarbonate roof problem + add your postcode to get free quotes.
Common Polycarbonate Roof Problems (And What They Usually Mean)
| What you notice | Likely cause | Typical repair approach |
|---|---|---|
| Drips at overlaps or glazing bars | Failed seals, slipped sheets, poor alignment | Re-seat sheets, replace gaskets, improve overlap |
| Leaks at fixing points | Old washers, oversized holes, loose screws | Replace fixings and washers, re-secure correctly |
| Cracked sheets | UV ageing, impact, stress at fixings | Replace damaged sheets and check support spacing |
| Rattling in wind | Loose fixings or poor bar engagement | Re-secure sheets, upgrade fixings where needed |
| Water running back under sheets | Low slope or poor detailing | Improve end closures, add flashings, adjust falls |
| Excess condensation | Poor ventilation or temperature swings | Improve ventilation and check seals |
Why Polycarbonate Roofs Leak
Polycarbonate rarely “fails” across the sheet. Instead, leaks usually start at:
- the glazing bars (gaskets and end caps)
- the fixings (washers perish and holes widen)
- overlaps and sheet joints
- the wall junction (where roof meets the house)
- the edge drainage (gutters and outlets)
Therefore, a good repair focuses on the junctions and fixings, not just a quick sealant line.
Polycarbonate Roof Repair Cost Guide (UK)
Costs depend on access, roof size, sheet thickness/type, and how many panels need replacing.
| Repair type | Typical cost range | Notes |
|---|---|---|
| Replace fixings and washers (localised) | £150–£450 | Great for leaks at screw points |
| Reseal / re-seat sheets and overlaps | £180–£650 | Depends on roof size |
| Replace 1–3 cracked polycarbonate sheets | £250–£1,000 | Sheet type and thickness affect cost |
| Replace multiple sheets / larger section | £600–£2,500+ | Depends on roof size and system |
| Repair wall flashing / junction seal | £200–£900 | Common leak point on lean-tos |
| Gutter repair / replacement (small run) | £150–£650 | Reduces overflow and splash |
Repair vs Replace: When Does Polycarbonate Need Upgrading?
Repair usually makes sense when:
- you have one cracked sheet or a small leak point
- the glazing bars remain solid
- the sheets still look clear and flexible
Replacement may be better when:
- multiple sheets have crazed, yellowed, or become brittle
- fixings keep pulling out
- the roof has ongoing movement and rattling
- leaks appear along several bars and overlaps
What You Can Do While You Wait (Safe Steps)
You can reduce damage without taking risks:
- Move furniture, electrics and valuables away from drips
- Put trays or buckets under leak points
- Photograph cracks and fixing points from inside/outside
- Avoid climbing onto the roof (polycarbonate can be slippery and fragile)
- If sheets are loose in wind, keep people away from the drip line
How to Get Polycarbonate Roof Repair Quotes
Step 1: Describe the roof type and issue
For example: “conservatory roof leaking at bar”, “carport polycarbonate cracked”, or “leaks at fixing points”.
Step 2: Add your postcode
Then local specialists can respond.
Step 3: Compare quotes and choose
Finally, compare scope, materials, access requirements, and cost.
Get Free Polycarbonate Roof Repair Quotes
FAQs – Polycarbonate Roof Repairs
Can you repair polycarbonate without replacing the whole roof?
Often yes. Many jobs only need new washers, better seals, or replacement of a few cracked sheets. However, if the sheets have become brittle across the roof, replacing larger sections can be more cost-effective.
Why does my polycarbonate roof leak at the screws?
Washers harden and shrink over time. As a result, water can track down the screw holes. Replacing fixings and washers usually solves it.
Is sealant a permanent fix?
Not usually. Sealant can help temporarily, but the best repair uses correct fixings, gaskets, and proper overlaps so the roof stays watertight.
Is it safe to walk on a polycarbonate roof?
No. Polycarbonate can crack under weight and can also be very slippery. Contractors use safe access methods and crawling boards where required.
How long do polycarbonate repairs last?
A proper repair can last for years when the contractor replaces failed fixings and seals and secures the sheets correctly.