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Repair a conservatory gutter.
Leaking junction, blocked downpipe or storm-damaged gutter — fixed without ripping out the conservatory roof.
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Misidentified leak source
Water enters at the wall but appears at the eaves. Always hose-test from the top down.
Cheap silicone fixes
General-purpose silicone fails on plastic conservatory roof. Use EPDM tape or proprietary roof sealant.
Box gutter flashing failure
Lead flashing chases that have come loose let water track in. Re-bed with proper lead-mortar mix and a chase indent.
Polycarbonate panel slippage
Panels move 5–10mm with temperature; the end caps must allow this without gap. Re-fit panels with new clip retainers.
Costs & timeline
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Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Diagnostic / hose-test calloutFirst hour
£80–£200
Re-seal box gutter to wallEPDM tape or flashband
£180–£500
Replace box gutter sectionIf aluminium gutter cracked
£250–£800
Replace bar capping sealsPer side of roof
£150–£400
Replace rafter end sealOften misdiagnosed source
£120–£300
Replace one polycarbonate panelIf panel cracked
£120–£400
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Conservatory gutters are the most leak-prone gutter type in the UK home. The box gutter that runs between the conservatory roof and the house wall is the usual culprit. Expect to pay £180–£800 for a typical UK conservatory gutter repair, depending on which seal or flashing has failed.
What Does the Work Involve?
The fitter first identifies where the water comes through — into the conservatory at the wall junction (box gutter or flashing), down the rafters (roof seals), at the eaves (eaves gutter), or via the bar joints (capping seals). Each has a different fix. Box gutter leaks usually mean re-bedding the rubber seal at the brick face or replacing the lead/flashband flashing. Eaves gutter leaks are joint connectors. Rafter or bar seals need EPDM strip replacement.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Diagnostic / hose-test callout | 80 | 200 | First hour |
| Re-seal box gutter to wall | 180 | 500 | EPDM tape or flashband |
| Replace box gutter section | 250 | 800 | If aluminium gutter cracked |
| Replace bar capping seals | 150 | 400 | Per side of roof |
| Replace rafter end seal | 120 | 300 | Often misdiagnosed source |
| Replace one polycarbonate panel | 120 | 400 | If panel cracked |
| Full re-seal of roof | 500 | 1,500 | Conservatory specialist |
How Long Does It Take?
Most repairs are 2–4 hours. A full re-seal of a 4m × 3m conservatory roof: half a day. Major box gutter or flashing replacement: 1 day.
DIY or Professional?
Professional. Conservatory roofs are slippery and the boundary seals require specialist EPDM tape and silicone, applied to dry, primed surfaces. DIY attempts with general silicone usually fail in 6–18 months and make the eventual professional fix more expensive.
Choosing the Right Tradesperson
Use a conservatory specialist or window fitter familiar with the conservatory system brand (Ultraframe, Eurocell, Synseal, Liniar). Ask which brand they specialise in — proprietary parts vary by manufacturer. Get the diagnostic step itemised — most leaks need 30 minutes of hose-testing to find the real source.
UK Regulations
Conservatory repairs don't need notification. If the original conservatory was Building-Regs exempt (separated from the dwelling by external doors), that exemption continues for repairs. Listed buildings need consent for any visible alteration.
Common Problems
- Misidentified leak source: Water enters at the wall but appears at the eaves. Always hose-test from the top down.
- Cheap silicone fixes: General-purpose silicone fails on plastic conservatory roof. Use EPDM tape or proprietary roof sealant.
- Box gutter flashing failure: Lead flashing chases that have come loose let water track in. Re-bed with proper lead-mortar mix and a chase indent.
- Polycarbonate panel slippage: Panels move 5–10mm with temperature; the end caps must allow this without gap. Re-fit panels with new clip retainers.
Frequently Asked Questions
Why does my conservatory leak at the wall?
Usually the box gutter that runs between the roof and the wall. The flashband tape or lead flashing has perished — typical at 8–12 years.
Can I patch the leak with silicone?
Short-term yes, long-term no. Conservatory roofs flex with temperature and silicone tears. Use EPDM tape or the manufacturer's proprietary sealant.
How long do conservatory roof seals last?
8–12 years for EPDM bar seals; 10–15 years for box gutter flashing; 15–20 years for the polycarbonate or glass panels themselves.
Should I replace the whole roof?
If the conservatory is 15+ years old and multiple seals are failing, often more cost-effective to upgrade to a tiled lightweight roof — better thermal performance and 30-year warranty. Costs £6,500–£15,000.
Why does water track along the bar after rain?
The rafter-end seal has perished. Water that lands on the glass or polycarbonate runs to the eaves and gets behind the seal at the rafter end.
Are conservatory eaves gutters specially sized?
Yes — conservatory eaves gutters are usually 90mm or 100mm half-round, specific to the manufacturer's system. Use the matching profile rather than retro-fitting domestic 112mm.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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