Realistic 2025 prices for Velux supply and installation in Winchester — by window size, plus what drives the cost up and conservation area advice.
Velux roof windows are one of the most popular home improvement requests we receive across Winchester. This is the honest 2025 price guide for supply, installation and flashing in the Winchester area.
| Window Size | Supply & Installation |
|---|---|
| CK02 — 550×980mm (standard) | £600–£950 |
| FK06 — 660×1180mm | £700–£1,100 |
| PK10 — 940×1600mm | £850–£1,350 |
| SK10 — 1140×1600mm (large) | £950–£1,500 |
| Conservation-grade (GGL, copper) | +20–40% |
| Structural trimming (if required) | £200–£450 add |
All prices include the window, manufacturer-supplied flashing kit, installation and making good. Scaffolding is not normally required for roof window installation on accessible pitches.
In Winchester's conservation areas, Velux windows on principal (street-facing) elevations are generally not permitted development and planning consent is very unlikely to be granted. Rear slope windows within the permitted development limits do not need consent. We confirm this at survey stage at no charge.
Supply of the window and flashing kit. Installation including cutting the tile opening, fitting the frame, installing the manufacturer-supplied flashing kit, relaying the surrounding tiles, making good the opening from inside, and checking operation of the sash. VAT is included in all our quotes.
Window size is the primary cost driver. Conservation-grade models (Velux GGL with copper or pine finish) cost more than standard white-painted models. Structural trimming — required when the opening spans more than one rafter bay — adds £200–£450. Access difficulty on steep or high pitches may add a surcharge.
The most common sizes on Winchester residential properties are CK02 (550×980mm) and FK06 (660×1180mm). We recommend having a loft ladder or access before the survey visit, as the best size recommendation depends on the distance from the eaves to the ridge, the rafter spacing, and what you need the window to achieve — light, ventilation or a habitable room requirement. We advise on size at the free survey visit.
Free Velux survey and fixed quote
We supply, flash and install Velux and compatible roof windows across Winchester and Hampshire. Call to arrange a free survey.
📞 01962 809171Winchester has extensive conservation area coverage — Hyde, St Giles Hill, the Cathedral Close periphery, Kingsgate Street and parts of Weeke. In these areas, Velux windows on principal (street-facing) elevations are not permitted development and planning consent is very unlikely to be granted. Rear slope windows within permitted development limits do not need consent.
For listed buildings anywhere in Winchester, even rear slope Velux windows may require Listed Building Consent. We advise on the planning position at the free survey visit — before any window is ordered. Getting this wrong means removing a window at your own cost.
Can I fit Velux on my 1930s property in Weeke? Yes on rear slopes. Front slopes in conservation-adjacent areas require planning advice first.
What Velux size do I need for a habitable loft room? Building regulations require a minimum opening area of 1/20th of the floor area for habitable loft rooms. For most Winchester loft conversions, FK06 (660×1180mm) or larger is the appropriate size.
Do you flash Velux windows on clay tile roofs? Yes — Velux supplies tile-specific flashing kits for plain clay plain tiles, the dominant material on Winchester period properties. We confirm the correct kit at survey stage.
How long does Velux installation take? A single window on an accessible pitch: 3-5 hours including flashing and tile redressing. Two windows same day on most properties.
Whatever roofing work your Winchester property needs, these are the mistakes we see most frequently from homeowners who have been through a bad experience:
Accepting a verbal quote. Any job over £300 should have a written, itemised quote. Verbal quotes are unenforceable and tend to grow significantly by the time the invoice arrives.
Paying the full amount upfront. A deposit of 10–25% is standard. Full payment before work is complete removes all your leverage if the work is unsatisfactory.
Not checking NFRC registration. A roofer claiming NFRC membership who is not listed at nfrc.co.uk is not registered. Takes 30 seconds to check.
Choosing on price alone. Three quotes where one is 35% below the others is not a bargain — it is a signal that scaffolding, waste disposal or material quality is being cut from the scope.
Not asking about mortar specification. For Winchester period properties, the wrong mortar causes brickwork damage. Always ask: lime mortar or modified cement?
The next step after reading any roofing guide is a free professional survey. We cover all of Winchester and the surrounding Hampshire area — Eastleigh, Romsey, Chandler's Ford, Bishop's Waltham, New Alresford, Kings Worthy, Twyford, Colden Common, Otterbourne and Compton.
Call 01962 809171 or email info@winchesterroofers.co.uk. Free survey. Written condition report. Same-week appointments. No call-out fee. No obligation.
My Winchester property has 400mm rafter spacing. What does this mean for Velux sizing?
A 400mm rafter spacing is common on Victorian and 1930s Winchester properties. Most standard Velux sizes (CK02 at 550mm wide, FK06 at 660mm wide) will span across 1-2 rafter bays at this spacing. Where the window opening spans a rafter, a structural trimming header must be installed between the adjacent rafters. We confirm the exact structural requirement at survey and include it in the quote.
Can I have two Velux windows side by side on my Winchester terrace loft?
Yes, subject to structural assessment. Two windows side-by-side require two trimming headers and removal of the intermediate rafter — this is a structural alteration that we include in the survey assessment. Most Winchester Victorian terrace rafters can accommodate twin Velux openings. Building regulations approval is required for habitable room loft conversions.
My Winchester property is in a conservation area. Can I have a Velux on the rear slope?
Rear slope Velux windows within permitted development limits (projecting no more than 150mm above roof plane, not on highway-facing elevations) do not require planning permission in most Winchester conservation areas. We confirm the specific conservation area rules for your property at the free survey visit.
How do I clean a Velux window on a steep Winchester roof?
Modern Velux GGL and GGU windows have a pivot mechanism that allows the window to rotate 180 degrees for external glass cleaning from inside. This is the correct cleaning method — we do not recommend accessing the tile surface around the window for cleaning purposes.
Supply and installation of a standard Velux window (CK02 550×980mm): £600–£950. FK06 (660×1180mm): £700–£1,100. Conservation-grade centre-pivot models cost 20–40% more. Free survey and fixed quote.
Yes — every Velux installation we carry out includes the manufacturer-supplied flashing kit for the specific window size and tile profile. Incorrectly flashed windows are the most common cause of roof window leaks.
A single window on an accessible pitch: 3–5 hours. Two windows same day. Structural trimming (opening spanning more than one rafter bay) adds 2–4 hours.
Rear slope windows within permitted development limits (projecting no more than 150mm above roof plane, not on a highway-facing elevation) do not need planning permission. Conservation area front elevations and listed buildings require consent.
Yes — Velux supplies tile-specific flashing kits including for plain clay plain tiles common on Winchester period properties. We confirm the correct flashing kit at survey stage.
No call-out fees. No obligation. An honest quote from a local roofer.
01962 809171