Why is my Velux window leaking in Eastbourne?

Almost certainly a flashing failure rather than a unit fault. Wrong flashing kit, missing lead soakers, or degraded flashing material are the most common causes. We diagnose the actual failure point before recommending any work.

Do I need to replace my leaking Velux unit?

In 80% of cases, no. The correct repair is a flashing replacement — significantly cheaper than unit replacement. We inspect before recommending.

How much does a leaking Velux repair cost in Eastbourne?

Flashing replacement runs £200–£500 depending on the tile type and extent of work. This resolves the leak in most cases. Unit replacement, where genuinely required, runs £600–£1,200.

Why do I need lead soakers with my Velux installation?

On plain tile roofs, the tile profile leaves a gap between the standard flashing kit and the tile surface. Lead soakers fill this gap and direct water away from the frame junction. They're essential on clay and concrete plain tile roofs common across Meads, Bexhill, and Seaford.

Can I install Velux windows in a conservation area in Eastbourne?

Conservation areas including Meads and Old Town Eastbourne may require slim-profile conservation roof light units that sit flush with the roof plane. Standard Velux units projecting 150mm+ from the roof surface may not be consented. We advise before any installation.

How do I maintain my Velux window in Eastbourne?

Annual drainage channel clear in November after leaf fall. Visual inspection of flashing perimeter from inside the open window. Check EPDM weatherseal for hardening or lifting — coastal UV accelerates weatherseal degradation faster than standard inland timescales.

Leaking Velux Windows in Eastbourne — Why They Leak and How to Fix Them

A leaking Velux in Eastbourne is almost always a flashing failure, not a faulty unit — fixable for £200–£500 rather than £600–£1,200 for replacement. Common causes are the wrong flashing kit for the tile type, missing lead soakers, or perished weatherseal. Correct diagnosis before any work prevents unnecessary unit replacement.

Leaking Velux windows are a common problem across Eastbourne's housing stock — particularly on the loft conversions carried out in large numbers across the Hampden Park, Langney, and Polegate areas from the 1980s through to the 2000s. In the large majority of cases we encounter, the Velux unit itself is functioning correctly and the leak originates from failed or incorrectly installed flashing.

Why Velux Windows Leak in Eastbourne

A correctly flashed Velux installation has three elements working together: the unit itself, the manufacturer flashing kit specified for the exact tile type in use, and lead soakers on plain tile installations. When any of these elements is incorrect, missing, or degraded, water finds a path at the tile-to-frame junction and enters through what appears to be the unit.

The failure modes we see most often on Eastbourne loft conversion properties:

Wrong flashing kit. Generic universal flashing kits don't accommodate the range of tile profiles used across East Sussex's housing stock. A kit specified for modern concrete interlocking won't seal correctly against the lower profile of 1930s clay plain tile. Many loft conversions installed Velux windows using the cheapest available kit — this is the most common cause of leaks on Hampden Park and Langney properties.
Missing lead soakers. On plain tile roofs — common across Meads, Old Town, and much of Bexhill's Edwardian stock — lead soakers under the tile courses adjacent to the Velux frame are essential. Omitting them leaves a gap between the manufacturer flashing kit and the tile surface that drives water toward the frame in heavy rain.
Degraded EPDM gasket. The EPDM gasket around the Velux frame perimeter compresses over time, particularly in the UV-intensive coastal East Sussex environment. After 15–20 years, the gasket no longer seals effectively. This is a unit-level repair — replacement gasket kits are available — but it's less common than flashing failures.
Incorrect installation angle. Velux manufacturers specify minimum and maximum pitch ranges for each product. Windows installed below the minimum pitch for their product type trap water against the frame. This is a fundamental installation error that requires either unit replacement with the correct product or conversion to a flat-roof window unit.

Leaking Velux Repair — Eastbourne and East Sussex

We identify the actual cause before recommending any work. Free survey. Call 01323 365960 or request a callback.

Call 01323 365960

Roof windows must be installed with the manufacturer's flashing kit matched to the specific roof covering profile to maintain the weatherproofing warranty.
Source: VELUX installation specification

Our Diagnosis Process

Before recommending any Velux repair in Eastbourne, we carry out a full inspection of the installation: the unit condition, the flashing kit specification and condition, soaker installation on plain tile roofs, the tile/frame junction on all four sides, and the internal reveal for evidence of the leak path. In 80% of the Eastbourne properties we assess for leaking Velux windows, the correct repair is a flashing replacement — not unit replacement. The cost difference is significant: flashing repair runs £200–£500; unit replacement runs £600–£1,200.

New Velux Installations in Eastbourne

For new Velux installations on Eastbourne properties, correct specification is the critical variable:

Centre-pivot or top-hung selection based on head height and ventilation requirements
Manufacturer flashing kit matched to the exact tile profile in use on the roof
Lead soakers on all plain tile installations
Installation at the correct angle for the pitch of the roof
For conservation area properties: conservation slim-profile units that sit flush with the roof plane

A correctly specified and installed Velux on an Eastbourne property should not leak. If it does, the installation is wrong. We guarantee all new Velux installations for 10 years against water ingress.

Flat Roof Skylights as an Alternative to Standard Velux in Eastbourne

For Eastbourne properties with low-pitch or flat roof sections — including the flat-roof extensions and garage loft conversions common across Polegate, Hampden Park, and Hailsham — standard pitched-roof Velux windows are not the correct product. Velux and equivalent manufacturers produce flat roof skylights designed for pitches from 0–15 degrees, with their own flashing systems and drainage requirements. We frequently encounter standard pitched-roof Velux units incorrectly installed in flat roof sections across East Sussex — these leak because they're the wrong product for the application, not because of installation failure.

The correct product for an Eastbourne flat roof skylight is a curb-mounted unit with an integrated kerb that raises the glazed section above the roof plane, preventing water pooling against the frame. These cost more than standard Velux (typically £400–£800 supply and fit) but perform correctly in the applications where standard products have historically been misspecified. When surveying a leaking skylight in a flat roof section, we identify product suitability for the pitch as the first diagnostic step — the wrong product cannot be made to seal correctly regardless of the quality of the flashing installation.

Velux maintenance on Eastbourne coastal properties benefits from an annual drainage channel clear. The small channels at the bottom of the Velux frame that carry away incidental water can block with debris during East Sussex's autumn leaf fall. A blocked drainage channel causes water to back up into the room even on a well-flashed, correctly installed unit. Clearing these annually with a piece of wire prevents what appears to be a flashing failure but is actually a simple maintenance issue resolved in minutes.

The Velux Flashing Replacement Process in Eastbourne

A Velux flashing replacement on an Eastbourne property starts with identifying the exact product installed — Velux unit model number and installation year determine which flashing kit is required. This information is on a label inside the Velux frame, visible when the window is open. Once the correct kit is confirmed, the surrounding tile courses are carefully lifted to access the existing flashing, the old flashing is removed, and the new kit is installed following the manufacturer's installation sequence exactly. The tile courses are relaid in sequence and the completed installation is water-tested before we leave site.

On plain tile roofs — common on Eastbourne's Victorian, Edwardian, and interwar properties — lead soakers are cut and installed for each tile course adjacent to the Velux frame as part of the flashing replacement. The soakers are cut to the specific depth of the tile being used — handmade plain clay tiles vary in depth between batches and the soaker must be cut accurately to sit correctly in the tile course without either bridging the tile joint or leaving a gap. This detail is frequently omitted by contractors unfamiliar with plain tile roofing and is the most common cause of persistent leaks on Velux installations in Meads and Old Town properties that have already had one flashing replacement.

After installation, we test the completed Velux with a hose at low flow — not high pressure — simulating the rain pattern of a moderate to heavy rainfall event. The test covers the perimeter of the frame on all four sides and the upslope tile-frame junction. Any defect in the flashing or soaker installation shows as water entry during this test rather than during the next rainfall event. We don't consider a Velux flashing replacement complete until the water test is passed.

Velux Repair Quick Reference — Eastbourne

Velux flashing replacement: £200–£500 typically. Unit replacement (where genuinely required): £600–£1,200. We diagnose the actual cause before recommending any work — in 80% of Eastbourne properties we assess, flashing replacement resolves the leak without unit replacement. Free surveys for all Eastbourne and East Sussex properties.

Velux Repair Quick Reference — Eastbourne

We diagnose the cause before recommending work. In 80% of Eastbourne cases, flashing replacement resolves the leak without unit replacement. We don't recommend unit replacement unless the diagnosis clearly requires it. Free surveys for all Eastbourne and East Sussex properties.

Symptom	Most Likely Cause	Correct Fix
Water at frame base, heavy rain only	Wrong flashing kit for tile type	Correct-spec flashing replacement
Water at frame base, any rain	Missing lead soakers (plain tile)	Soaker installation + flashing check
Water around full perimeter	Degraded EPDM weatherseal	Gasket replacement kit
Water at bottom of frame after leaf fall	Blocked drainage channel	Clear drainage channels
Flat roof skylight leaking	Wrong product for flat pitch	Correct flat-roof unit

Symptom	Likely Cause	Correct Fix	Cost
Water at frame base, heavy rain	Wrong flashing kit for tile type	Correct flashing replacement	£200–£500
Water at base, any rain	Missing lead soakers	Soakers + flashing check	£250–£550
Water full perimeter	Failed EPDM weatherseal	Gasket replacement	£150–£350
Blocked drainage channel	Leaf debris in channel	Clear channels	£50–£100
Flat roof skylight leaking	Wrong product for pitch	Correct flat-roof unit	£400–£800

Leaking Velux Windows in Eastbourne — Why They Leak and How to Fix Them

Why Velux Windows Leak in Eastbourne

Leaking Velux Repair — Eastbourne and East Sussex

Our Diagnosis Process

New Velux Installations in Eastbourne

Flat Roof Skylights as an Alternative to Standard Velux in Eastbourne

The Velux Flashing Replacement Process in Eastbourne

Velux Repair Quick Reference — Eastbourne

Velux Repair Quick Reference — Eastbourne

Frequently Asked Questions

Need a Roofer in East Sussex?

Leaking Velux Windows in Eastbourne — Why They Leak and How to Fix Them

Why Velux Windows Leak in Eastbourne

Leaking Velux Repair — Eastbourne and East Sussex

Our Diagnosis Process

New Velux Installations in Eastbourne

Flat Roof Skylights as an Alternative to Standard Velux in Eastbourne

The Velux Flashing Replacement Process in Eastbourne

Velux Repair Quick Reference — Eastbourne

Velux Repair Quick Reference — Eastbourne

Frequently Asked Questions

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