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Velux window installation cost in 2026 usually sits between £900 and £1,800 per window across the UK, including the window, flashing and labour. The exact figure depends on the window size, whether the opening already exists and how easy your roof is to reach. For homeowners considering professional Velux skylight window fitting in North Yorkshire, this breakdown shows what drives each part of the price.
We cover typical prices by window type, labour rates, three worked examples, the extras that catch people out and practical ways to keep costs down.
How Much to Fit a Velux Window: Quick Answer
The cost to fit a Velux window is the combined price of the unit, the flashing kit and the installer’s labour. As a quick guide, a like-for-like swap costs around £750 to £1,400, while a brand new opening costs roughly £1,150 to £2,400.
The gap between those two figures comes down to structural work. When an old roof window is replaced, the frame fits into an opening that has already been trimmed and insulated. A new window means stripping the roof covering, cutting rafters, fitting timber trimmers and rebuilding the weatherproofing around the frame.
Roof Window Cost UK: Prices by Window Type
Roof window cost in the UK is set mainly by size and opening style. The table below shows approximate prices for the window unit alone, before fitting.
| Window type | Common use | Unit price (approx.) |
| Small centre-pivot | Lofts, bathrooms, landings | £350 to £550 |
| Mid-size top-hung | Loft rooms needing headroom | £500 to £900 |
| Large centre-pivot (SK06, UK04) | Living spaces, extensions | £600 to £1,100 |
| Balcony or Cabrio | Loft bedrooms with views | £1,000 to £3,500 |
Upgrades change the price quickly. Solar or electric opening adds roughly £300 to £800 per window, and better glazing for noise or heat control adds £150 to £400. Budget brands such as RoofLITE or Dakstra can be 30 to 40 percent cheaper than Velux for similar sizes, although Velux offers a 10-year product guarantee and a wide range of matching blinds.
Velux Fitting Labour Cost and Timescales
Velux fitting labour cost covers the time a roofing team spends removing tiles or slates, installing the frame and flashing, and making the roof weathertight. Most installers work in pairs, at a combined day rate of around £325.
| Job | Typical time | Labour per window |
| Straight replacement | Half a day to 1 day | £350 to £450 |
| New opening, tiled roof | 1 to 1.5 days | £400 to £550 |
| New opening, slate roof | 1.5 to 2 days | £450 to £600 |
Slate roofs take longer because each slate has to be removed carefully and refixed, and replacements may be needed if any crack. Labour across Yorkshire and the North tends to be cheaper than in London and the South East, where rates are often 20 to 30 percent higher.
Skylight Installation Cost 2026: Real Examples
Skylight installation cost in 2026 is easiest to understand through typical jobs. These examples combine unit, flashing, labour and common extras.
- Replacing one small centre-pivot window from inside the loft: around £800 to £1,400, with no scaffolding needed.
- Adding a new mid-size top-hung window to a slate roof: around £1,800 to £2,800, including scaffolding and making good inside.
- Fitting two large solar-powered windows in a loft room: around £3,800 to £6,000 for both, with shared scaffolding.
Treat these as budgeting ranges rather than quotes. Your final figure will depend on your roof, the window code you choose and access around the property.
Extra Costs to Budget For
Extra costs are the items that sit outside the basic supply-and-fit price. Asking about them early prevents surprises once work starts.
- Scaffolding: about £500 if the window cannot be fitted safely from inside.
- Flashing kit: £100 to £250, matched to tiles or slate.
- Internal finishing: £150 to £500 for plastering and decorating the reveal.
- Electrics: £100 to £400 for powered blinds or opening systems.
- Insulation upgrades: £50 to £200 around the new frame.
- Timber or tile repairs: priced separately if rot or damage is found once the roof is opened.
Where the surrounding roof is in poor condition, combining the window job with roof repair services makes good use of the same access and labour.
Replacing vs Adding a New Roof Window
Replacing a roof window is the cheaper option, because the structural work has already been done. It is usually worth considering when an existing window leaks, mists between the panes, sticks when opening or feels draughty. In many cases, the new window can use the same size code, which keeps the job quick and tidy.
Adding a new window costs more, but it can transform a dark loft, stairwell or extension. If your roof is nearing the end of its life, it is often better value to plan roof windows as part of a full new roof installation rather than cutting them into old coverings.
Rules, Permissions and Building Regs
Roof windows are usually allowed under permitted development, which means you do not normally need planning permission. The main conditions are that the window does not stick out more than 150mm from the roof slope and does not sit above the highest part of the roof.
Different rules apply to listed buildings and conservation areas, which cover parts of Harrogate, Knaresborough, Ripon and York. In these places, a flush conservation-style window may be required, so check with your local council first.
Building Regulations still matter. Replacement windows should achieve a U-value of 1.4 W/m²K, new openings that cut rafters need building control approval, and a window serving as a loft escape route must meet minimum size rules.
Ways to Keep Your Costs Down
Keeping costs down is mostly about planning the work well rather than cutting corners.
- Choose a standard size code where possible, as common sizes are cheaper and easier to source.
- Fit several windows in one visit to share scaffolding and set-up costs.
- Ask whether the window can be installed from inside the loft.
- Compare at least two itemised quotes that list the window code, flashing, access and VAT.
When you are ready, request a free Velux installation quote and ask for a written workmanship guarantee alongside the manufacturer’s cover.
Frequently Asked Questions
Is a Velux window worth the cost?
For most homes, yes. A roof window brings in natural light, improves ventilation and can make a loft room far more usable.
Can a Velux window be fitted in winter?
Yes. Installers work in dry spells and protect the opening with temporary covers, although heavy rain or high winds can delay the job.
Do I need scaffolding for a Velux window?
Not always. Many windows can be fitted from inside, but steep, high or hard-to-reach roofs usually need scaffolding for safety.
How long does a Velux window last?
A properly installed Velux window can last 20 years or more. Regular cleaning, clearing debris from the flashing and checking seals every few years all help it stay weathertight for longer.
