Roof window and skylight installation across Farnham and Surrey — VELUX and equivalent, sun tunnels, and dormer lights. Fitted with the correct flashing kit for your exact tile type, because that’s what stops a roof window leaking.
VELUX and skylight installation in Farnham costs £600–£900 for a standard roof window supplied and fitted, £700–£1,000 for wet-room models, and £350–£550 for a sun tunnel. The critical factor is the correct flashing kit for your tile type — the usual cause of leaks. Free quotes, no call-out fee. Call 0125 244 7622.
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VELUX & Skylights
Why Flashing Is Everything on a Roof Window
A roof window is a hole deliberately cut in your roof, and everything about whether it works comes down to how the join between the window and the surrounding roof is weatherproofed. That join is the flashing kit, and it is specific to your tile type. A VELUX in a slate roof needs a different flashing kit from the same window in deep-profile concrete interlocking tile or flat clay — and fitting the wrong one, or fudging a generic one, is overwhelmingly the reason roof windows leak.
This is where a proper installation earns its keep. We identify your exact covering and specify the matching flashing kit, so the window sits into the roof with a weathertight seal designed for those tiles. The window unit itself is the easy part; the flashing and the making-good around it are the craft. A roof window fitted with the correct kit and properly weatherproofed will stay dry for decades — one fitted with the wrong flashing will leak at the first driving rain, no matter how good the window is. It’s the single question worth asking any installer: which flashing kit, for my tiles?
Honest advice
How to Tell You Need VELUX & Skylight Installation
A roof window transforms a dark loft or room, but it’s only as good as its flashing. Here’s when a skylight is the right call — and what makes the difference between one that lasts and one that leaks.
A loft conversion or upstairs room that’s too dark and needs natural light
An existing roof window that’s leaking, draughty or misted up (failed seals)
A windowless internal room — bathroom, landing, hallway — that a sun tunnel could light
A dormer or older skylight that’s tired and due replacement
You want to add light without the cost and planning of a full dormer
When it is not the answer: If your room just needs a brighter feel rather than genuine daylight, a roof window is a big intervention — sometimes a sun tunnel, at a third of the cost, does the job. And where an existing VELUX has only a failed blind or seal, that’s a repair, not a full replacement. We’ll point you to the cheaper fix where it exists. Read the full guide.
Where a roof window sits in the roof structureFarnham knowledge
Roof Windows on Farnham’s Homes
Roof windows are in demand across Farnham, and the town’s housing shapes what suits where. The post-war estates in Heath End, Badshot Lea, Weybourne and Upper Hale have generous loft spaces on their concrete-tiled roofs, and these are the properties where loft conversions and roof windows are most common — the deep-profile concrete interlocking tile needs its specific flashing kit, and getting that right is the whole job. Sun tunnels are popular here too, bringing light into windowless landings and bathrooms without the cost of a full window.
The Victorian and Edwardian terraces around Hale Road, Victoria Road and Firgrove Hill are a more delicate proposition. Their slate roofs need slate-specific flashing, and on properties within or near the conservation areas around The Borough and Castle Street, the position and visibility of a roof window can matter for planning — a window on a principal elevation facing the street may need consent from Waverley Borough Council, where one on a hidden rear slope usually doesn’t. We advise on this at survey stage so you don’t fit a window that has to come out again.
Across GU9 and GU10, the pattern is the same: the right window and the right flashing for your exact roof, positioned to give the light you want while respecting any conservation or planning constraint. Get those right and a roof window is one of the best-value ways to transform a dark space; get the flashing wrong and it’s a leak waiting to happen.
The process
What to Expect: VELUX & Skylight Installation in Farnham
1. Survey and specify
We check the roof structure, pitch and tile type, and specify the right window and — crucially — the correct flashing kit for your exact covering. Wrong flashing is the number one cause of roof-window leaks.
2. Written quote
You get an itemised quote for the window, flashing, fitting and any making-good, with no call-out fee and no obligation.
3. Installation
We form the opening, fit the window and its flashing kit, weatherproof around it properly, and make good the roof and the internal reveal.
4. Finish and test
We check it opens, closes and seals correctly, clean up, and leave the window watertight and working — backed by our guarantee.
Timescales
How Long Does It Take?
Job
Typical duration
Single roof window (like-for-like)
1 day
New opening formed
1–2 days
Sun tunnel
Half a day
Multiple windows
2–3 days
Forming a new opening exposes the roof briefly, so we work to dry weather windows and weatherproof as we go if conditions turn.
Access
Access, Scaffolding & Permits in Farnham
Roof window work is usually done from a scaffold or tower for safe working at the opening, with internal access needed for the reveal and finish. Scaffold is specified for: for most installations, to work safely at the opening — itemised in the quote and arranged by us - always itemised in your written quote, never a hidden extra, and we arrange it.
Farnham’s Georgian and Victorian streets around the town centre have limited frontage and controlled pavement space, so scaffold on the conservation streets needs planning and a permit. Pavement scaffold and skip permits go through Waverley Borough Council; allow a few working days on streets like Castle Street, The Borough, Downing Street where space is tight.
Pricing
What VELUX & Skylight Installation Costs in Farnham
Job
Typical range
Notes
Standard roof window, supplied & fitted
£600–£900
Correct flashing kit included
Wet-room / larger window
£700–£1,000
For bathrooms and bigger openings
Sun tunnel
£350–£550
Light into windowless rooms
New opening formed (add)
£200–£500
Where no existing window
Dormer window repair
Priced per scope
Flashing, glazing, making-good
What moves the price
Window size, type and whether an opening must be formed
Your tile type — determines the flashing kit
Access and scaffold requirements
Internal making-good and reveal finish
Worked example: A standard VELUX fitted into the concrete-tiled rear slope of a 1960s semi in Heath End, with the correct deep-profile flashing kit, opening formed and reveal made good: £820 including access.
No deposit on single-window installs; staged payment on multi-window or opening-forming jobs, nothing before materials are on site. Itemised quote with the flashing kit specified.
Covering GU9, GU10 and surrounding postcodes.
Guarantee
Your Guarantee, Explained
Our fitting workmanship is guaranteed for 10 years, and the roof windows themselves carry the manufacturer’s warranty — typically 10 years on a VELUX, longer on the glazing units.
Covered: workmanship for 10 years, in writing, transferable if you sell.
On top: manufacturer warranties on materials (terms vary by product).
Not covered: storm or impact damage - that is an insurance matter, and we will document it for your claim.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
VELUX and roofing-industry fitting guidance specify that a roof window must be installed with the flashing kit matched to the roof covering profile, as an incorrect or generic flashing is the predominant cause of roof-window water ingress.Source: VELUX / NFRC fitting guidance
Want to bring light into a dark room or loft? Get a quote.
Fitting a roof window is moderately disruptive for a day or two — some noise and dust internally where the opening is formed, and we sheet up and protect the room. You’ll want to be home to agree the internal finish. You do not need to stay home for external work - we just need power and access agreed in advance.
We install year-round but plan opening-forming around dry spells, weatherproofing as we go if the weather turns. The Wey valley holds autumn moisture, and Farnham’s heavy tree cover slows drying and blocks gutters through the leaf-fall months.
Reviews
What Farnham Homeowners Say
★★★★★
"Two VELUX windows in our loft conversion in Weybourne, fitted with the right flashing for the concrete tiles. Not a drop of water in three winters. They made good the internal reveals beautifully too. Transformed the space."
Rachel D. · Weybourne, Farnham
★★★★★
"Had a leaking older skylight on our slate roof near Hale Road. They replaced it with the correct slate flashing kit — explained the old one had the wrong flashing, which was the whole problem. Dry now. Proper job."
Simon K. · Hale Road, Farnham
★★★★★
"Sun tunnel into our windowless bathroom in Heath End — half a day’s work and it’s like a different room. They suggested it instead of a full window to save us money. Honest advice, great result."
Karen P. · Heath End, Farnham
FAQ
Frequently Asked Questions
A standard roof window supplied and fitted is £600–£900, wet-room and larger models £700–£1,000, and a sun tunnel £350–£550. Forming a new opening where there isn’t one adds £200–£500. All prices include the correct flashing kit for your tile type.
Almost always because of the wrong flashing. The flashing kit that weatherproofs the join between window and roof is specific to your tile type, and fitting a generic or incorrect one is the number one cause of roof-window leaks. We specify the matching kit for your exact covering, which is what keeps it dry.
Usually not on a rear or hidden slope, where roof windows are generally permitted development. But a window on a principal elevation facing the street, or on a property in a conservation area around The Borough or Castle Street, may need consent from Waverley Borough Council. We advise on this at survey stage.
A sun tunnel is a reflective tube that channels daylight from the roof into a windowless room below — ideal for internal bathrooms, landings and hallways. At £350–£550 it’s a third of the cost of a full roof window and needs no large opening, so where you want light rather than a view or ventilation, it’s often the smarter choice.
Yes. We replace tired or leaking roof windows and skylights, and very often the leak is down to the original having the wrong flashing for the tiles — which we put right with the correct kit. Where only a seal or blind has failed, we’ll tell you if a repair will do rather than a full replacement.
A like-for-like replacement is usually a single day. Forming a brand-new opening takes one to two days, and a sun tunnel about half a day. Multiple windows run to two or three days. We weatherproof as we go, so the roof is never left exposed overnight.
There’s some noise and dust internally where the opening is formed, which is why we sheet up and protect the room and clear up thoroughly afterwards. You’ll want to be home to agree the internal reveal finish, but the disruption is short — a day or two for most installs.
