Extensions & Conversions · Updated 2026
Velux window cost
Typical range£600–£5,000· Average Velux window installed (78x98cm)
Velux and roof window installation prices for 2025. In the UK, expect to pay between £600 and £5,000, with the typical project around £1,100 (average velux window installed (78x98cm)). Regional variation, specification tier and site access conditions all shift the final quote.
Quick answer: Velux window cost in the UK typically costs between £600 and £5,000 (Average Velux window installed (78x98cm)). London and the South East run 20–35% above this range; the North, Wales and most of Scotland sit 5–15% below.
Homeowners researching this typically also price up double glazing cost. For wider context, browse our bathroom pricing, kitchen pricing and boiler & heating costs.
Cost table
Indicative price ranges (UK, GBP)
| Item | Typical range (GBP) |
|---|---|
Small Velux (55x78cm, supply & fit) — Entry size, one window | £600–£900 |
Standard Velux (78x98cm) — Most popular size | £900–£1,400 |
Large Velux (94x118cm) — More light, more expensive | £1,200–£2,000 |
Electric / remote Velux — Motorised, rain sensor, remote | £1,500–£3,000 |
Multiple windows (3 units) — Three standard Velux, loft conversion | £2,500–£5,000 |
Labour costs
Labour typically accounts for 40% of the total project cost in the UK.
Labour line items
| Item | Typical range (GBP) |
|---|---|
Roofer (per window) | £200–£450 |
Internal fitting / lining | £100–£300/window |
Electrician (electric models) | £150–£300 |
Materials costs
Materials and fittings make up the remainder of the budget, with specification tier driving most of the variation.
Materials & fittings
| Item | Typical range (GBP) |
|---|---|
Velux GGL (manual, 78x98cm) | £350–£600 |
Velux GGU (white PVC, 78x98cm) | £400–£650 |
Velux GGL (electric, 78x98cm) | £700–£1,200 |
Flashing kit (included usually) | £60–£120 |
Internal reveal lining kit | £80–£200 |
Factors affecting cost in the UK
- ·Region — London and the South East run 15–30% above national averages.
- ·Specification tier — premium materials and finishes can double the base cost.
- ·Access and site conditions — flats, restricted parking and listed buildings add time.
- ·Scope changes mid-project — late design decisions are the biggest cost overrun driver.
- ·Trade availability — quotes rise 10–20% in peak spring and summer months.
Ways to reduce cost
- ·Choose standard sizes (CK04, MK06, UK04) rather than bespoke openings.
- ·Fit two smaller windows rather than one large for cheaper structural work.
- ·Buy direct from Velux distributors rather than through a roofing contractor.
- ·Phase install with a planned re-roof to share scaffold and roofer labour.
- ·Skip electric openers unless the window is genuinely out of reach.
Frequently asked questions
- Do Velux windows need planning permission?
- Roof windows (including Velux) that do not project more than 150mm above the roof plane and are fitted in the existing roof are usually permitted development. Side elevation windows in conservation areas may need approval.
- How long does a Velux window last?
- Velux windows are designed to last 20–30 years. The sealed glazing unit may need replacing after 15–25 years if condensation appears between the panes. Velux offer a 10-year guarantee on new windows.
- Can I fit a Velux window myself?
- The window itself can be DIY-fitted if you are confident working at height and the roof structure is straightforward. However, the roof flashing (weatherproofing around the frame) is critical and often benefits from a skilled roofer to ensure a watertight installation.