Velux window installation, replacement and flashing repair across Cheltenham and Gloucestershire. Correct specification for clay, slate and stone tiles. Conservation area advice included. Free surveys and written quotes.
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📞 Call Now: 0124 235 2251Loft conversions are common across Cheltenham's Victorian and Edwardian suburbs, and Velux windows are the standard solution. Getting the flashing specification right for clay tiles, plain tiles or Welsh slate is critical — it is where most failures begin.
Supply and fit of Velux GGL, GGU, GPL or GPL roof windows in sizes from 55x78cm to 114x118cm. Includes structural opening, flashing kit specified for tile type, and internal lining. Conservation area advice included in survey. From £450 per window.
Get a Quote →Failed or incorrectly fitted flashings are the most common cause of Velux leaks. We replace with Velux EKL, EDL or BFX flashing kits as appropriate for your tile type and roof pitch. Often resolves a persistent leak without needing to replace the window unit. From £200.
Get a Quote →Velux windows from the 1980s and 1990s are at end of life — failed seals, broken mechanisms, non-energy-rated glazing. We replace old units with current Velux models using matching size openings where possible. From £500 including new flashing kit.
Get a Quote →Not sure if your leak is from the window or the flashing? We carry out diagnostic inspections on existing Velux installations and report on the source before quoting for repair. Many Velux leaks are flashing failures, not window failures — important to know before replacing the unit.
Book Survey →Cheltenham's conservation areas and listed buildings place restrictions on roof window types and positions. We advise on planning requirements at survey stage — in some zones, conservation roof lights flush with the tile plane are required. We specify and fit compliant solutions.
Enquire →Velux solar-powered opening roof windows require no electrical cabling and are suitable for properties where hardwired installation is impractical. We supply and fit the VSE and VSS solar ranges with rain sensors. From £700 per window installed.
Get a Quote →Velux roof window installation in Cheltenham costs £850–£2,500 per window supplied and fitted, depending on size and roof type. We install into slate and tile roofs with correct flashing kits for a watertight seal. Work carries a 10-year guarantee. Call 0124 235 2251 for a free quote.
Cheltenham's varied housing stock means no single flashing specification works across the whole town.
Victorian and Edwardian terraces in Cheltenham — Fairview, St Paul's, Charlton Kings — often have clay plain tiles. Velux flashings for clay plain tiles require EDJ or BFX specification. A standard EDL flashing on a clay plain tile roof will fail within 2-3 years.
Natural Welsh slate requires EW combination flashing kits. The thin profile and irregular surface of Welsh slate is not compatible with standard EDL flashings. We specify correctly at survey for every property type before fitting.
In Montpellier, Lansdown, Pittville and the wider Regency conservation area, roof windows must often be conservation-type flush lights that sit flush in the roof plane rather than projecting. Standard Velux may not be acceptable — we advise before any work is committed.
Most Velux installations qualify as permitted development and do not require planning permission. Exceptions include listed buildings, conservation areas and some article 4 directions. We check your specific property situation as part of every free survey.
Roof windows and skylights bring light into lofts and extensions, but they're also a common leak point when badly fitted. Whether you need a new install, a replacement or just a repair to the flashing kit is the first thing to establish.
When it is not the answer: If your existing Velux is sound and only the flashing kit or seals have failed, you need a repair, not a whole new window — and not every dark loft needs a rooflight if a sun tunnel would do the job for less. Read the full guide.
We assess the roof pitch, covering and structure and specify the right unit and flashing kit — the correct kit for slate differs from that for interlocking tile, which is where leaks start.
A fixed price for supply and fit, including the flashing kit, internal reveal finishing and any structural trimming of rafters where needed.
Most installs are a day or two; we pick a dry window as the roof is briefly open during fitting.
We form the opening, fit the window and its correct flashing kit, integrate it with the covering and underlay, and finish the internal reveal so it's watertight and neat.
Debris cleared, the window tested for operation and weathertightness, and the guarantee and manufacturer warranty handed over.
| Job | Typical duration |
|---|---|
| Replace a like-for-like Velux | Half to 1 day |
| New roof window install | 1–2 days |
| Multiple windows / large rooflight | 2–3 days |
| Flashing-kit or seal repair | 2–4 hours |
The roof is briefly open during a window install, so we choose a dry window and dry-in around the unit at the end of each day.
Roof-window work is done from the roof surface with a tower or roof ladder for most single-storey and dormer positions; higher installs may need scaffold. Scaffold is specified for: first-floor and higher installs, or multiple units across a large roof - always itemised in your written quote, never a hidden extra, and we arrange it.
Cheltenham's Regency terraces in Montpellier and Lansdown have railings, lightwells and shared party walls that limit rear access, so pavement scaffold and skip space usually need a permit. Pavement scaffold and skip permits go through Cheltenham Borough Council; allow a few working days on streets like Montpellier Street, the Suffolks, the terraces off St Paul's Road where space is tight.
| Job | Typical range | Notes |
|---|---|---|
| Flashing-kit / seal repair | £150–£400 | Where the unit is sound |
| Replace like-for-like Velux | £450–£900 | Supply and fit, incl. kit |
| New roof window install | £900–£1,800 | Incl. structural trimming |
| Large rooflight / multiple units | £1,800–£4,000 | Per project |
| Sun tunnel install | £400–£800 | Light without a full window |
Worked example: Supplying and fitting a new centre-pivot Velux with the correct tile flashing kit and a plastered reveal in an Up Hatherley loft: around £1,150.
Repairs under £500 take no deposit. Supply-and-fit installs are invoiced on completion or in two stages, never before the unit is on site.
Our installation carries a written 10-year workmanship guarantee against leaks around the unit; the window itself carries the manufacturer's warranty (Velux typically 10 years) on top.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
Fitting a roof window means some internal dust and mess where the opening is formed; we sheet the room below and clear up, and you'll have a bright new opening the same day. You do not need to stay home for external work - we just need power and access agreed in advance.
We fit in dry conditions since the covering is opened up; the units themselves are weather-rated once installed and flashed correctly. Cheltenham's sheltered vale position brings damp Cotswold-edge autumns and heavy leaf fall from the town's many mature trees, which keeps north-facing slopes slow to dry.
"Two Velux windows fitted in our Victorian loft conversion in Fairview. They specified the correct flashing for our clay plain tiles without me having to ask — a previous quote had the wrong type. No leaks since installation and the loft is transformed."
"Velux flashing replacement on our Charlton Kings semi — the original installer had used the wrong flashing type on our clay tiles and it had been leaking for two years. Correct EDJ flashing fitted, no leak since. Should have been done right the first time."
"Replacement of three original 1990s Velux windows on our Prestbury Victorian. Old units had failed seals and draughts. New GGL windows with correct flashing kits — warm, watertight and properly warranted. Good value for the improvement."
A standard centre-pivot Velux supply and installation costs £600–1,200. Larger fixed or top-hung units cost £900–2,000 installed. Prices include making good the surrounding roof covering.
Standard Velux windows not projecting more than 150mm above the roof plane and not on the front elevation fall under permitted development. Conservation area properties or listed buildings may need consent. We advise at survey stage.
Yes. For conservation area properties we recommend the Velux conservation window range with flush-fitting profiles and discrete flashings that meet planning officer expectations.
The standard recommendation is glazed area equal to at least 10% of the room floor area. For a typical Cheltenham loft bedroom, a 78cm x 118cm or 94cm x 118cm centre-pivot unit is most common.
A single Velux in a standard Cheltenham property typically takes one day including making good the surrounding roof covering. Multiple windows take longer and are quoted individually.
Centre-pivot units work in pitches from 15 to 90 degrees. Very low-pitch applications need a flat-roof Velux unit. We specify the correct product for your roof during the free survey.
Standard Velux double-glazed units should not cause condensation in a properly ventilated loft. If condensation is already present it indicates insufficient ventilation, which we check at survey stage.
We survey existing or planned Velux installations for free and advise on the correct specification for your tile type and conservation area status.
0124 235 2251Velux and roof windows, skylights and dormer windows are all ways of bringing light into a Cheltenham loft, but they suit different projects. A standard Velux or roof window sits flush in the roof slope and is the simplest, most cost-effective option — ideal for loft conversions on the inter-war semis of Warden Hill, Up Hatherley and Charlton Kings, and for lighting landings and bathrooms. We install into slate and tile roofs with the correct flashing kit for a watertight seal.
Dormer windows project out from the roof, adding both light and headroom, and are what turn a cramped loft into a usable full bedroom. The flat or pitched top of a dormer is a common leak point where it meets the main roof and its leadwork, so the detailing matters as much as the window itself — we tie the dormer cheeks and roof correctly into the surrounding slate or tile. Dormers are popular on Cheltenham's Victorian and Edwardian terraces where roof space is generous but headroom under the slope is limited.
Roof lights and glazed roof lanterns are the third option, most often set into the flat roof of a rear extension rather than a pitched slope. On Cheltenham's many contemporary kitchen-diner extensions in Leckhampton, Charlton Kings and the Park, a lantern or run of roof lights transforms the light in the room. We integrate these cleanly into GRP and EPDM flat roofs with watertight detailing at the junction.
Building Regulations Approved Document L applies when roof windows or skylights are installed, requiring minimum thermal performance of the glazing, and conservation-area rules can restrict roof-light placement on visible slopes — both worth checking before a Cheltenham loft project begins.