Skylight installation cost in the UK starts from around £650 for a straightforward replacement and can rise beyond £7,000 for a large roof lantern. The spread is wide because the cost of skylight installation depends on the type of unit, roof structure, glazing, access, internal finishing, and whether the job is a simple swap or a brand-new opening.
For homeowners comparing quotes, the difficulty is that two prices can look similar but include very different things. One quote may cover flashing, scaffolding, making good, and VAT. Another may leave half of that for later.
This guide covers 2026 UK skylight installation costs, what affects the final price, and what should be in the quote before you agree to anything.
Average Skylight Installation Costs in the UK (2026)
The table below shows typical costs for replacement skylights or installations into an existing opening. Labour is included. Scaffolding, structural work for new openings, and VAT at 20% are not.
| Skylight Type | Unit Cost (supply only) | Installed Cost (labour included, ex. VAT) |
|---|---|---|
| Fixed pitched roof window | £200 to £600 | £800 to £1,600 |
| Manually opening roof window | £600 to £1,000 | £1,200 to £2,400 |
| Electric opening roof window | £1,200 to £1,800+ | £2,600 to £3,600+ |
| Flat roof fixed rooflight | £350 to £950 | £1,100 to £2,000 |
| Flat roof opening rooflight | £800 to £1,400 | £1,800 to £3,000+ |
| Roof lantern | £500 to £2,600+ | £2,500 to £7,000+ |
Industry estimates put the typical skylight cost with installation at around £900 to £2,600 per unit, with many homeowners spending between £800 and £1,500. Straightforward replacement work usually sits lower, at roughly £650.
Lower-end quotes tend to involve standard-size units on accessible pitched roofs with concrete tiles. The skylight cost and installation figure rises with bespoke sizes, awkward roof types, multi-storey access, or higher-spec glazing. A basic centre-pivot roof window from a major manufacturer starts from around £305 ex. VAT supply only; a roof balcony option in the same range can exceed £2,559 supply only before labour.
What Affects the Price of Skylight Installation?
Skylight Type
The cost of skylight and installation rises as you move from fixed units to manual openers, electric openers, and roof lanterns. The right choice depends on the room. Bathrooms, kitchens, and loft bedrooms usually benefit from an opening unit for ventilation. A hallway or landing may only need daylight, so a fixed skylight can be enough.
Size and Bespoke Specifications
Larger skylights cost more to buy and take longer to fit. Bespoke sizes are typically 30% to 50% more expensive than catalogue sizes because they are made as one-off orders, usually with longer lead times.
Roof Type
Standard pitched roofs with common rafters are usually the simplest to work on. Flat roofs need an upstand or kerb to lift the skylight above the roof surface. Slate and clay tile roofs take more careful removal and reinstatement than concrete tiles, typically adding £100 to £250 in labour.
Glazing Specification
Triple glazing, self-cleaning coatings, acoustic glass, privacy glass, and solar-control glass all increase unit cost. As a reference point, a 500x500mm fixed frameless skylight starts from around £165 ex. VAT with standard glazing. Upgrading the same unit to triple glazing with satin privacy glass raises it to around £225 ex. VAT.
On a common 780x980mm roof window, triple glazing typically adds £80 to £150 over the double-glazed equivalent. Part L of the Building Regulations sets minimum U-value standards for new and replacement rooflights, so the cheapest glazing option may not be compliant.
Framed vs Frameless
Frameless rooflights usually cost 20% to 40% more than framed versions. Fixed frameless units run roughly £1,300 to £2,150 installed, compared with around £1,050 to £1,600 for framed units of a similar size.
Location and Access
Multi-storey homes, steep roofs, and restricted side access may require scaffolding, often adding £500 to £1,500+. London and South East labour rates are typically 20% to 30% above the national average, which feeds directly into the skylight installation cost UK homeowners see on quotes.
Labour Costs for Skylight Installation in 2026
Roofers typically charge a day rate of £150 to £250 per operative, so a standard two-person crew costs around £300 to £500 per day.
A like-for-like replacement on a pitched tiled roof usually takes three to six hours. A new opening on a flat roof, including upstand fabrication, can take a full day or more. Roof lanterns and projects involving structural openings often take two to three days.
Supply-Only vs Supply-and-Fit
Buying the skylight yourself can reduce the product cost because contractors often mark up units by 10% to 20%. But check whether your roofer is willing to install a third-party unit and what happens to the warranty. Some contractors will not guarantee weathertightness on a skylight they did not supply. Get that agreed in writing before spending the money.
Additional Costs to Factor Into Your Skylight Budget
Scaffolding
Budget £500 to £1,500 depending on property height, access, roof pitch, and hire duration. Single-storey flat roof jobs may avoid scaffolding entirely.
Internal Finishing
The reveal may need plastering, lining, or painting once the skylight is fitted. Budget £150 to £400 for basic internal finishing; more involved work can reach £300 to £700.
Structural Work
Creating a new opening adds £300 to £800 in materials and labour, plus a Building Regulations application. Building Notice fees typically cost £150 to £300.
Blinds and Accessories
Blinds can add £100 to £500+ depending on brand, size, and whether they are manual or electric. Better to price them before installation than discover the perfect blind costs more than expected.
Flashing Kits
Brand-specific flashing kits for VELUX or Fakro roof windows usually cost £50 to £200 depending on tile type. Check whether the kit is included in your quote or shown separately.
Waste Disposal
Waste disposal should be included by a reputable contractor. Confirm this in writing before work starts.
Skylight Installation Cost: Worked Example
Scenario: an East Midlands homeowner wants a new fixed double-glazed flat roof rooflight measuring 600mm x 900mm installed over a kitchen extension with no existing skylight.
| Cost Line | Amount (ex. VAT) |
|---|---|
| Mid-range framed fixed flat roof unit | £400 |
| Flashing/upstand kit | £80 |
| Structural opening (cutting joists, fitting trimmer) | £400 |
| Roofer labour (one day, two-person team) | £300 |
| Internal plastering and making good | £200 |
| Building Regulations fee (Building Notice) | £150 |
| Subtotal (ex. VAT) | £1,530 |
| VAT at 20% | £306 |
| Total (inc. VAT) | £1,836 |
This sits above the average cost of skylight installation for straightforward jobs because it involves a new structural opening. A like-for-like replacement would remove the structural work and Building Regulations fee, bringing the total closer to £1,000 inc. VAT.
Upgrading to an electric opening unit would add roughly £300 to £500, taking the total to around £2,200 to £2,400 inc. VAT. In London or the South East, expect labour to rise by around 20% to 30%.
Do Skylights Add Value to Your Home?
Sometimes. In loft conversions, roof windows often provide the strongest return because they help make the space habitable. In kitchens and extensions, skylights can make a room more appealing, though they are rarely the sole reason a property sells for more.
Replacing an old single-glazed or poorly insulated skylight with a modern triple-glazed unit can improve energy performance, which is becoming more relevant to buyers and some mortgage decisions.
For a 12sqm kitchen, the 20% glazed-area guideline for good daylight means roughly 2.4sqm of glazing. That typically means two medium skylights, with a combined installed cost of around £2,000 to £4,000 ex. VAT. Skylights are an effective way to bring in light without losing wall space.
The caveat: a badly fitted skylight can do the opposite of adding value. Damp staining around a skylight is exactly what a surveyor will notice. Remedial work on a leaking skylight often costs £300 to £800, so paying a competent installer at the start is usually cheaper than fixing a poor job later.
Do You Need Planning Permission for a Skylight in the UK?
Permitted Development in England
Most domestic skylight installations in England fall under permitted development rights, provided the skylight does not protrude more than 150mm above the roof slope, is not on a roof slope facing a highway, and does not exceed the highest point of the existing roof.
Roof lanterns can be a particular issue because their raised profile may breach the 150mm limit.
When Permitted Development Does Not Apply
Properties in Conservation Areas, particularly on highway-facing slopes, listed buildings, and homes where permitted development rights have been removed by a planning condition all require additional checks. Confirm local authority records or title deeds before assuming permission is not needed.
Building Regulations
Building Regulations apply separately from planning permission. Any new structural opening needs a Building Regulations application. Part A covers structural safety; Part L covers energy performance. A straightforward Building Notice application usually costs £150 to £300.
Non-compliant units, especially those that fail minimum U-value requirements, may not be signed off by building control.
Scotland, Wales, and Northern Ireland
The rules above apply to England only. Scottish readers should check the ePlanning Scotland portal, Welsh readers can consult Planning Wales, and Northern Irish readers should use the NI Planning Portal. When in doubt, contact your local planning authority before work starts.
How to Get an Accurate Skylight Installation Quote
Get three written, itemised quotes. A good skylight quote should set out:
- Unit brand and model
- Glazing specification
- Labour
- Flashing or upstand kit
- Access or scaffolding
- Internal making good
- Waste disposal
- VAT
The average cost for skylight installation can sit anywhere from £900 to £2,600 per unit, so comparing like-for-like details matters. A quote that excludes internal finishing, access, or VAT may not be cheap once everything is added back in.
Check Credentials
NFRC membership or TrustMark registration are useful indicators that the installer works to recognised standards. Check these alongside reviews, insurance, and clear warranty terms.
Confirm What’s Included
Before signing, confirm whether internal plastering and making good, waste removal, scaffolding, flashing kit supply and fitting, and Building Regulations submission are included or priced separately. Anything not listed clearly in the quote may appear later as an extra.
Confirm Warranties
The unit and glazing should carry at least a 10-year manufacturer’s warranty. Workmanship should be covered by a separate contractor guarantee.
For roof lanterns or new structural openings, ask whether the contractor can handle the Building Regulations process. Some include it in their price, others charge £100 to £200 extra.
Ready to compare skylight installation costs? Fix My Roof lets you request free, no-obligation quotes from local roofing professionals so you can compare what is included before deciding who to hire.