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Velux Installation & Repair Dublin

Install, replace or repair Velux roof windows with correct flashing and watertight detailing across Dublin.

New installs & replacements

Leak repairs around flashing/seals

Clear written quotes

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Velux installation & repair dublin by MJ roofing
Velux installation dublin by MJ roofing
Skylight or velux installation & repair dublin by MJ roofing

Install, Repair or Replace?

Three different services for different needs — we help you choose the right solution for your property.

Install

Adding a new Velux roof window where none exists — perfect for bringing light into dark spaces.

  • Loft conversions & attic rooms
  • Dark hallways, stairwells, bathrooms
  • New builds or extensions needing daylight

Typical Scenarios:

Converting an attic into a bedroom, adding light to a windowless bathroom, improving natural light in a dark landing.

Repair

Fixing leaks, drafts or failed seals on an existing Velux that's otherwise in good condition.

  • Water staining around the frame
  • Drafts, failed seals, condensation issues
  • Flashing detached or poorly fitted

Typical Scenarios:

Leak after storm damage, failed flashing on 10-year-old window, cold drafts around frame, visible gaps at junctions.

Replace

Removing an old, damaged or outdated roof window and installing a modern Velux unit.

  • Old roof windows beyond repair
  • Upgrading to modern double/triple glazing
  • Damaged frame, cracked glazing, repeated leaks

Typical Scenarios:

20-year-old window leaking repeatedly, cracked glazing, poor energy efficiency, frame rot or corrosion.

Problem Solving

Common Velux / Roof Window Issues

From minor leaks to complete replacements — we diagnose and fix Velux problems across Dublin.

Leaks Around Flashing

Failed or poorly fitted flashing causing water ingress at roof junction. Most common Velux problem.

Roof Leak Repair

Drafts / Failed Seals

Gaps around frame, perished rubber seals, poor weatherproofing. Cold air infiltration, heat loss.

Water Staining Around Opening

Damp patches on ceiling or walls near Velux. Often caused by flashing failure or blocked drainage.

Problems After Storms

Wind-driven rain penetrating seals, lifted flashing, damaged tiles around Velux creating new leak paths.

Condensation Issues

Excess moisture on glass or frame. Can indicate poor ventilation or failed double-glazing seal.

Damaged Glazing/Frame

Cracked glass from storm debris, impact damage, or thermal stress. Frame rot or corrosion on older units.

Incorrect Fitting / Poor Detailing

Velux not integrated properly with tile/slate roof. Water channels directly to opening rather than around it.

Replacement of Older Roof Windows

Outdated units that are beyond economical repair. Modern replacements improve performance and efficiency.

Why Flashing Matters

The vast majority of Velux leaks are caused by flashing failure rather than the window unit itself. Flashing is the weatherproofing system (metal or synthetic components) that integrates the Velux frame with your roof covering, directing water safely around the opening. When flashing is poorly fitted, deteriorates over time, or isn’t appropriate for your specific tile or slate type, water finds a way through — appearing as damp patches on your ceiling or walls.
Velux provides different flashing kits designed for different roof coverings — plain tiles, profiled tiles, slates of varying thicknesses. Using the wrong kit or fitting it incorrectly means water doesn’t drain properly around the window. Blocked drainage channels at the base of the flashing, poor sealing at the sides, or incorrect integration with tile courses all create leak paths. We’re experienced in fitting Velux flashing kits correctly for Dublin’s common roof types — slate, concrete tile, and clay tile roofs.
Chimney Flashing & Repairs
Roof Valley Repair

Our Velux Installation & Repair Process

Roof Assessment & Sizing

We inspect your roof structure, covering type (tiles/slates), and identify the best position for the Velux based on room layout, rafter spacing, and tile courses. Correct sizing ensures proper fit between rafters.

Integration With Tiles/Slates

We carefully remove tiles or slates around the opening area, cut the roof opening (protecting your interior), and fit the Velux frame. Precision here prevents future problems.

Flashing & Weatherproofing

The critical step. We fit the manufacturer-approved Velux flashing kit for your specific roof type, ensuring proper overlap with tiles/slates, sealed drainage channels, and watertight junctions at all edges.

Interior Protection & Tidy Finish

We protect your interior with dust sheets during cutting work, fit internal trim/lining (if included), and leave the site clean. Photos and written quotes provided on request.
Velux installation & repair service dublin

Flashing Experts

Leak-Free Installation

For repairs, we diagnose the leak source first — checking flashing condition, frame seals, drainage channels, and roof covering around the Velux. Most leaks are fixable by replacing or resealing flashing without replacing the entire window. If the Velux unit is damaged (cracked glazing, failed seals, corroded frame), we advise on repair versus replacement options honestly, with clear pricing for both.

Replacement work involves removing the old unit carefully, preparing the opening, and installing a modern Velux with new flashing appropriate to your roof type. Every job includes a written quote detailing materials (Velux model, flashing kit, any additional tiles/slates), labour, access requirements (scaffolding if needed), and costs broken down clearly. You’ll know exactly what’s included before we start. We also handle related roof work if needed — see our general skylight services page for non-Velux options.

Leaking Around a Velux Roof Window?

Call us for repairs in Dublin — we’ll diagnose the problem and fix it properly.
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Related Roof Work We Often Do

Slate & Tile Roof Repairs

Repair or replace tiles/slates around Velux openings, ensuring proper integration.

Roof Leak Repair

Diagnose and fix roof leaks that may be near or mistaken for Velux leaks.

Roof Repairs

General roof repairs including flashing, valleys, and weatherproofing work.

Recent Roof Window Work

MJ Roofing Dublin Roof Repair

Velux Leak Repair & Flashing Check — Dublin City

Persistent leak from failed flashing. Removed old flashing, fitted new Velux-approved kit for tile roof. Leak fixed, ceiling dried out.
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Roof Window Replacement — North Dublin

20-year-old window with cracked glazing and corroded frame. Replaced with modern Velux unit, new flashing. Energy efficiency improved.
Downpipe repairs and replacement dublin by MJ roofing

New Roof Window Install — South Dublin

Attic conversion requiring natural light. Cut opening, fitted Velux with flashing kit for slate roof. Room transformed with daylight.
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Service Areas

Areas We Cover

We provide Velux Installation & Repair services across Dublin and surrounding areas, including Dublin City, North Dublin, South Dublin, Swords, Malahide, Portmarnock, Lucan, Tallaght, Dundrum, Blackrock and nearby areas.

See All Areas

Not listed? Call us — we likely cover your area.

RELATED SERVICES

Frequently Asked Questions

Can you repair a leaking Velux without replacing it?
Yes, most Velux leaks can be repaired without replacing the entire unit. The most common cause is failed flashing — the weatherproofing system around the window frame. We remove the old or damaged flashing and fit a new Velux-approved flashing kit appropriate to your roof type (tiles, slates, etc.). If the Velux frame is sound, the glazing is intact, and seals are working, then flashing repair solves the problem permanently. We also check and repair seals around the frame itself if they’ve perished. However, if the Velux is very old, the glazing is cracked, the frame is corroded, or you’ve had repeated repairs, replacement may be more cost-effective long-term. We assess the condition honestly, explain your options, and provide clear pricing for both repair and replacement. Many leaks are fixable without replacing the window.
Velux leaks are almost always caused by flashing failure rather than the window itself. Flashing integrates the Velux frame with your roof covering, directing water safely around the opening. Poor installation, using the wrong flashing kit for your tile/slate type, deteriorated materials, or roof movement over time all cause flashing seals to fail. Blocked drainage channels at the base of the flashing prevent water from draining away, causing it to back up and find a path through. Storm damage can lift flashing or damage roof tiles around the Velux, creating new leak paths. On flat roofs or shallow pitches, incorrect fall or poor detailing worsens the problem. Condensation is sometimes mistaken for leaks — warm, moist air condensing on cold glass or frame surfaces, dripping down. We diagnose the true source before recommending repairs. See our roof leak repair page for more on leak diagnosis.
Yes, we replace outdated or damaged roof windows with modern Velux units offering better insulation, weatherproofing, and performance. Older roof windows often have single glazing, poor thermal performance, and outdated flashing systems prone to leaks. Modern Velux replacements feature double or triple glazing, improved seals, thermal breaks, and manufacturer-approved flashing kits designed to integrate properly with contemporary roof coverings. Upgrading reduces heat loss, improves condensation resistance, and often includes opening/ventilation options. We measure the existing opening, recommend suitable Velux models based on your roof type and budget, and provide a written quote detailing materials, labour, and access costs. Replacement work includes removing the old window safely, preparing the opening, fitting the new Velux with proper flashing, and ensuring weathertight integration with surrounding tiles or slates.
Yes, we provide written quotes and photos as standard practice. Written quotes detail exactly what’s needed: Velux model and size, flashing kit for your specific roof type, any additional tiles/slates, labour, access requirements (scaffolding if needed), and costs broken down clearly. We explain what’s included and what’s not — for example, internal plastering or trim work may be separate if you’re arranging your own finishing trades. For repair work, we can take photos showing the leak source, damaged flashing, or condition of the existing Velux before and after completing repairs. This is particularly useful for insurance claims, landlord records, or your own documentation. Photos demonstrate the problem visually and confirm the work completed. Everything is transparent and documented upfront — no hidden costs or surprise charges once work begins.
Yes, we carry full public liability insurance for all roofing work, including Velux installation and repairs. Velux work involves cutting roof openings, working at height, using scaffolding or ladder access, and handling glazed units — all activities requiring proper insurance cover. Your property is fully protected while we work. Insurance covers accidental damage to your property, injury to third parties, and our own workforce. You can request to see our insurance documentation at any time. We follow health and safety procedures, use appropriate access equipment, protect your interior with dust sheets and careful handling, and work professionally on every job. We’re experienced in Velux work on all types of Dublin properties — from terraced houses to detached homes, loft conversions, and commercial buildings. Your peace of mind and property protection are priorities.
Velux installation on a standard pitched roof typically takes 1–2 days. Day one involves cutting the roof opening (protecting your interior), fitting the Velux frame and flashing, and making the roof weathertight. Day two (if needed) covers internal trim work, plastering touch-ups, or final adjustments. Simple leak repairs — replacing flashing or resealing — can often be completed in a few hours to half a day. Full Velux replacement (removing old unit, fitting new one with flashing) usually takes 1 day. Complex installations — multiple Velux windows, difficult access, flat roof units, or non-standard openings — may take longer. We provide realistic timescales when quoting and keep you informed if anything changes during the work. Weather-dependent work (cutting roof openings) requires dry conditions, so we schedule carefully and work efficiently to minimize disruption.
Yes, Velux leaks are often mistaken for general roof leaks because water appears on the ceiling near the window — making it seem like a roof covering problem rather than a Velux issue. However, the water source is usually failed flashing around the Velux frame, not the roof tiles or slates themselves. Water travels along roof timbers or down the inside of the flashing before dripping onto the ceiling, sometimes appearing several feet away from the actual Velux. Condensation can also be mistaken for leaks — warm, moist air from the room condenses on the cold Velux frame or glazing, dripping down and causing damp patches that look like water ingress. We trace the source carefully, checking flashing condition, roof covering around the Velux, internal condensation levels, and drainage at the base of the flashing kit. Proper diagnosis prevents wasted money on unnecessary roof repairs when the real issue is Velux weatherproofing.
Yes, Velux work often requires repairing or replacing surrounding roof tiles, slates, and flashing to ensure proper weatherproofing. When installing a new Velux, we carefully remove tiles or slates around the opening area, cut the roof opening, fit the Velux and flashing kit, and reinstate or replace tiles/slates around the opening to integrate neatly with the existing roof covering. For repairs, we check the condition of tiles and slates adjacent to the Velux — cracked, slipped, or poorly fitted tiles can contribute to leaks around the window area. We also inspect and repair any leadwork or flashing at roof junctions where the Velux meets valleys, ridges, or other roof features. Our experience in general roof repairs means we understand how Velux windows interact with the broader roof system. See our slate and tile repairs page and roof repairs page for related services.
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